diff options
Diffstat (limited to 'ext/pdo_sqlite/sqlite/src/build.c')
| -rw-r--r-- | ext/pdo_sqlite/sqlite/src/build.c | 3286 |
1 files changed, 0 insertions, 3286 deletions
diff --git a/ext/pdo_sqlite/sqlite/src/build.c b/ext/pdo_sqlite/sqlite/src/build.c deleted file mode 100644 index 5294c1a316..0000000000 --- a/ext/pdo_sqlite/sqlite/src/build.c +++ /dev/null @@ -1,3286 +0,0 @@ -/* -** 2001 September 15 -** -** The author disclaims copyright to this source code. In place of -** a legal notice, here is a blessing: -** -** May you do good and not evil. -** May you find forgiveness for yourself and forgive others. -** May you share freely, never taking more than you give. -** -************************************************************************* -** This file contains C code routines that are called by the SQLite parser -** when syntax rules are reduced. The routines in this file handle the -** following kinds of SQL syntax: -** -** CREATE TABLE -** DROP TABLE -** CREATE INDEX -** DROP INDEX -** creating ID lists -** BEGIN TRANSACTION -** COMMIT -** ROLLBACK -** -** $Id$ -*/ -#include "sqliteInt.h" -#include <ctype.h> - -/* -** This routine is called when a new SQL statement is beginning to -** be parsed. Initialize the pParse structure as needed. -*/ -void sqlite3BeginParse(Parse *pParse, int explainFlag){ - pParse->explain = explainFlag; - pParse->nVar = 0; -} - -#ifndef SQLITE_OMIT_SHARED_CACHE -/* -** The TableLock structure is only used by the sqlite3TableLock() and -** codeTableLocks() functions. -*/ -struct TableLock { - int iDb; /* The database containing the table to be locked */ - int iTab; /* The root page of the table to be locked */ - u8 isWriteLock; /* True for write lock. False for a read lock */ - const char *zName; /* Name of the table */ -}; - -/* -** Record the fact that we want to lock a table at run-time. -** -** The table to be locked has root page iTab and is found in database iDb. -** A read or a write lock can be taken depending on isWritelock. -** -** This routine just records the fact that the lock is desired. The -** code to make the lock occur is generated by a later call to -** codeTableLocks() which occurs during sqlite3FinishCoding(). -*/ -void sqlite3TableLock( - Parse *pParse, /* Parsing context */ - int iDb, /* Index of the database containing the table to lock */ - int iTab, /* Root page number of the table to be locked */ - u8 isWriteLock, /* True for a write lock */ - const char *zName /* Name of the table to be locked */ -){ - int i; - int nBytes; - TableLock *p; - - if( 0==sqlite3ThreadDataReadOnly()->useSharedData || iDb<0 ){ - return; - } - - for(i=0; i<pParse->nTableLock; i++){ - p = &pParse->aTableLock[i]; - if( p->iDb==iDb && p->iTab==iTab ){ - p->isWriteLock = (p->isWriteLock || isWriteLock); - return; - } - } - - nBytes = sizeof(TableLock) * (pParse->nTableLock+1); - sqliteReallocOrFree((void **)&pParse->aTableLock, nBytes); - if( pParse->aTableLock ){ - p = &pParse->aTableLock[pParse->nTableLock++]; - p->iDb = iDb; - p->iTab = iTab; - p->isWriteLock = isWriteLock; - p->zName = zName; - } -} - -/* -** Code an OP_TableLock instruction for each table locked by the -** statement (configured by calls to sqlite3TableLock()). -*/ -static void codeTableLocks(Parse *pParse){ - int i; - Vdbe *pVdbe; - assert( sqlite3ThreadDataReadOnly()->useSharedData || pParse->nTableLock==0 ); - - if( 0==(pVdbe = sqlite3GetVdbe(pParse)) ){ - return; - } - - for(i=0; i<pParse->nTableLock; i++){ - TableLock *p = &pParse->aTableLock[i]; - int p1 = p->iDb; - if( p->isWriteLock ){ - p1 = -1*(p1+1); - } - sqlite3VdbeOp3(pVdbe, OP_TableLock, p1, p->iTab, p->zName, P3_STATIC); - } -} -#else - #define codeTableLocks(x) -#endif - -/* -** This routine is called after a single SQL statement has been -** parsed and a VDBE program to execute that statement has been -** prepared. This routine puts the finishing touches on the -** VDBE program and resets the pParse structure for the next -** parse. -** -** Note that if an error occurred, it might be the case that -** no VDBE code was generated. -*/ -void sqlite3FinishCoding(Parse *pParse){ - sqlite3 *db; - Vdbe *v; - - if( sqlite3MallocFailed() ) return; - if( pParse->nested ) return; - if( !pParse->pVdbe ){ - if( pParse->rc==SQLITE_OK && pParse->nErr ){ - pParse->rc = SQLITE_ERROR; - return; - } - } - - /* Begin by generating some termination code at the end of the - ** vdbe program - */ - db = pParse->db; - v = sqlite3GetVdbe(pParse); - if( v ){ - sqlite3VdbeAddOp(v, OP_Halt, 0, 0); - - /* The cookie mask contains one bit for each database file open. - ** (Bit 0 is for main, bit 1 is for temp, and so forth.) Bits are - ** set for each database that is used. Generate code to start a - ** transaction on each used database and to verify the schema cookie - ** on each used database. - */ - if( pParse->cookieGoto>0 ){ - u32 mask; - int iDb; - sqlite3VdbeJumpHere(v, pParse->cookieGoto-1); - for(iDb=0, mask=1; iDb<db->nDb; mask<<=1, iDb++){ - if( (mask & pParse->cookieMask)==0 ) continue; - sqlite3VdbeAddOp(v, OP_Transaction, iDb, (mask & pParse->writeMask)!=0); - sqlite3VdbeAddOp(v, OP_VerifyCookie, iDb, pParse->cookieValue[iDb]); - } -#ifndef SQLITE_OMIT_VIRTUALTABLE - if( pParse->pVirtualLock ){ - char *vtab = (char *)pParse->pVirtualLock->pVtab; - sqlite3VdbeOp3(v, OP_VBegin, 0, 0, vtab, P3_VTAB); - } -#endif - - /* Once all the cookies have been verified and transactions opened, - ** obtain the required table-locks. This is a no-op unless the - ** shared-cache feature is enabled. - */ - codeTableLocks(pParse); - sqlite3VdbeAddOp(v, OP_Goto, 0, pParse->cookieGoto); - } - -#ifndef SQLITE_OMIT_TRACE - /* Add a No-op that contains the complete text of the compiled SQL - ** statement as its P3 argument. This does not change the functionality - ** of the program. - ** - ** This is used to implement sqlite3_trace(). - */ - sqlite3VdbeOp3(v, OP_Noop, 0, 0, pParse->zSql, pParse->zTail-pParse->zSql); -#endif /* SQLITE_OMIT_TRACE */ - } - - - /* Get the VDBE program ready for execution - */ - if( v && pParse->nErr==0 && !sqlite3MallocFailed() ){ - FILE *trace = (db->flags & SQLITE_VdbeTrace)!=0 ? stdout : 0; - sqlite3VdbeTrace(v, trace); - sqlite3VdbeMakeReady(v, pParse->nVar, pParse->nMem+3, - pParse->nTab+3, pParse->explain); - pParse->rc = SQLITE_DONE; - pParse->colNamesSet = 0; - }else if( pParse->rc==SQLITE_OK ){ - pParse->rc = SQLITE_ERROR; - } - pParse->nTab = 0; - pParse->nMem = 0; - pParse->nSet = 0; - pParse->nVar = 0; - pParse->cookieMask = 0; - pParse->cookieGoto = 0; -} - -/* -** Run the parser and code generator recursively in order to generate -** code for the SQL statement given onto the end of the pParse context -** currently under construction. When the parser is run recursively -** this way, the final OP_Halt is not appended and other initialization -** and finalization steps are omitted because those are handling by the -** outermost parser. -** -** Not everything is nestable. This facility is designed to permit -** INSERT, UPDATE, and DELETE operations against SQLITE_MASTER. Use -** care if you decide to try to use this routine for some other purposes. -*/ -void sqlite3NestedParse(Parse *pParse, const char *zFormat, ...){ - va_list ap; - char *zSql; -# define SAVE_SZ (sizeof(Parse) - offsetof(Parse,nVar)) - char saveBuf[SAVE_SZ]; - - if( pParse->nErr ) return; - assert( pParse->nested<10 ); /* Nesting should only be of limited depth */ - va_start(ap, zFormat); - zSql = sqlite3VMPrintf(zFormat, ap); - va_end(ap); - if( zSql==0 ){ - return; /* A malloc must have failed */ - } - pParse->nested++; - memcpy(saveBuf, &pParse->nVar, SAVE_SZ); - memset(&pParse->nVar, 0, SAVE_SZ); - sqlite3RunParser(pParse, zSql, 0); - sqliteFree(zSql); - memcpy(&pParse->nVar, saveBuf, SAVE_SZ); - pParse->nested--; -} - -/* -** Locate the in-memory structure that describes a particular database -** table given the name of that table and (optionally) the name of the -** database containing the table. Return NULL if not found. -** -** If zDatabase is 0, all databases are searched for the table and the -** first matching table is returned. (No checking for duplicate table -** names is done.) The search order is TEMP first, then MAIN, then any -** auxiliary databases added using the ATTACH command. -** -** See also sqlite3LocateTable(). -*/ -Table *sqlite3FindTable(sqlite3 *db, const char *zName, const char *zDatabase){ - Table *p = 0; - int i; - assert( zName!=0 ); - for(i=OMIT_TEMPDB; i<db->nDb; i++){ - int j = (i<2) ? i^1 : i; /* Search TEMP before MAIN */ - if( zDatabase!=0 && sqlite3StrICmp(zDatabase, db->aDb[j].zName) ) continue; - p = sqlite3HashFind(&db->aDb[j].pSchema->tblHash, zName, strlen(zName)+1); - if( p ) break; - } - return p; -} - -/* -** Locate the in-memory structure that describes a particular database -** table given the name of that table and (optionally) the name of the -** database containing the table. Return NULL if not found. Also leave an -** error message in pParse->zErrMsg. -** -** The difference between this routine and sqlite3FindTable() is that this -** routine leaves an error message in pParse->zErrMsg where -** sqlite3FindTable() does not. -*/ -Table *sqlite3LocateTable(Parse *pParse, const char *zName, const char *zDbase){ - Table *p; - - /* Read the database schema. If an error occurs, leave an error message - ** and code in pParse and return NULL. */ - if( SQLITE_OK!=sqlite3ReadSchema(pParse) ){ - return 0; - } - - p = sqlite3FindTable(pParse->db, zName, zDbase); - if( p==0 ){ - if( zDbase ){ - sqlite3ErrorMsg(pParse, "no such table: %s.%s", zDbase, zName); - }else{ - sqlite3ErrorMsg(pParse, "no such table: %s", zName); - } - pParse->checkSchema = 1; - } - return p; -} - -/* -** Locate the in-memory structure that describes -** a particular index given the name of that index -** and the name of the database that contains the index. -** Return NULL if not found. -** -** If zDatabase is 0, all databases are searched for the -** table and the first matching index is returned. (No checking -** for duplicate index names is done.) The search order is -** TEMP first, then MAIN, then any auxiliary databases added -** using the ATTACH command. -*/ -Index *sqlite3FindIndex(sqlite3 *db, const char *zName, const char *zDb){ - Index *p = 0; - int i; - for(i=OMIT_TEMPDB; i<db->nDb; i++){ - int j = (i<2) ? i^1 : i; /* Search TEMP before MAIN */ - Schema *pSchema = db->aDb[j].pSchema; - if( zDb && sqlite3StrICmp(zDb, db->aDb[j].zName) ) continue; - assert( pSchema || (j==1 && !db->aDb[1].pBt) ); - if( pSchema ){ - p = sqlite3HashFind(&pSchema->idxHash, zName, strlen(zName)+1); - } - if( p ) break; - } - return p; -} - -/* -** Reclaim the memory used by an index -*/ -static void freeIndex(Index *p){ - sqliteFree(p->zColAff); - sqliteFree(p); -} - -/* -** Remove the given index from the index hash table, and free -** its memory structures. -** -** The index is removed from the database hash tables but -** it is not unlinked from the Table that it indexes. -** Unlinking from the Table must be done by the calling function. -*/ -static void sqliteDeleteIndex(Index *p){ - Index *pOld; - const char *zName = p->zName; - - pOld = sqlite3HashInsert(&p->pSchema->idxHash, zName, strlen( zName)+1, 0); - assert( pOld==0 || pOld==p ); - freeIndex(p); -} - -/* -** For the index called zIdxName which is found in the database iDb, -** unlike that index from its Table then remove the index from -** the index hash table and free all memory structures associated -** with the index. -*/ -void sqlite3UnlinkAndDeleteIndex(sqlite3 *db, int iDb, const char *zIdxName){ - Index *pIndex; - int len; - Hash *pHash = &db->aDb[iDb].pSchema->idxHash; - - len = strlen(zIdxName); - pIndex = sqlite3HashInsert(pHash, zIdxName, len+1, 0); - if( pIndex ){ - if( pIndex->pTable->pIndex==pIndex ){ - pIndex->pTable->pIndex = pIndex->pNext; - }else{ - Index *p; - for(p=pIndex->pTable->pIndex; p && p->pNext!=pIndex; p=p->pNext){} - if( p && p->pNext==pIndex ){ - p->pNext = pIndex->pNext; - } - } - freeIndex(pIndex); - } - db->flags |= SQLITE_InternChanges; -} - -/* -** Erase all schema information from the in-memory hash tables of -** a single database. This routine is called to reclaim memory -** before the database closes. It is also called during a rollback -** if there were schema changes during the transaction or if a -** schema-cookie mismatch occurs. -** -** If iDb<=0 then reset the internal schema tables for all database -** files. If iDb>=2 then reset the internal schema for only the -** single file indicated. -*/ -void sqlite3ResetInternalSchema(sqlite3 *db, int iDb){ - int i, j; - - assert( iDb>=0 && iDb<db->nDb ); - for(i=iDb; i<db->nDb; i++){ - Db *pDb = &db->aDb[i]; - if( pDb->pSchema ){ - sqlite3SchemaFree(pDb->pSchema); - } - if( iDb>0 ) return; - } - assert( iDb==0 ); - db->flags &= ~SQLITE_InternChanges; - - /* If one or more of the auxiliary database files has been closed, - ** then remove them from the auxiliary database list. We take the - ** opportunity to do this here since we have just deleted all of the - ** schema hash tables and therefore do not have to make any changes - ** to any of those tables. - */ - for(i=0; i<db->nDb; i++){ - struct Db *pDb = &db->aDb[i]; - if( pDb->pBt==0 ){ - if( pDb->pAux && pDb->xFreeAux ) pDb->xFreeAux(pDb->pAux); - pDb->pAux = 0; - } - } - for(i=j=2; i<db->nDb; i++){ - struct Db *pDb = &db->aDb[i]; - if( pDb->pBt==0 ){ - sqliteFree(pDb->zName); - pDb->zName = 0; - continue; - } - if( j<i ){ - db->aDb[j] = db->aDb[i]; - } - j++; - } - memset(&db->aDb[j], 0, (db->nDb-j)*sizeof(db->aDb[j])); - db->nDb = j; - if( db->nDb<=2 && db->aDb!=db->aDbStatic ){ - memcpy(db->aDbStatic, db->aDb, 2*sizeof(db->aDb[0])); - sqliteFree(db->aDb); - db->aDb = db->aDbStatic; - } -} - -/* -** This routine is called whenever a rollback occurs. If there were -** schema changes during the transaction, then we have to reset the -** internal hash tables and reload them from disk. -*/ -void sqlite3RollbackInternalChanges(sqlite3 *db){ - if( db->flags & SQLITE_InternChanges ){ - sqlite3ResetInternalSchema(db, 0); - } -} - -/* -** This routine is called when a commit occurs. -*/ -void sqlite3CommitInternalChanges(sqlite3 *db){ - db->flags &= ~SQLITE_InternChanges; -} - -/* -** Clear the column names from a table or view. -*/ -static void sqliteResetColumnNames(Table *pTable){ - int i; - Column *pCol; - assert( pTable!=0 ); - if( (pCol = pTable->aCol)!=0 ){ - for(i=0; i<pTable->nCol; i++, pCol++){ - sqliteFree(pCol->zName); - sqlite3ExprDelete(pCol->pDflt); - sqliteFree(pCol->zType); - sqliteFree(pCol->zColl); - } - sqliteFree(pTable->aCol); - } - pTable->aCol = 0; - pTable->nCol = 0; -} - -/* -** Remove the memory data structures associated with the given -** Table. No changes are made to disk by this routine. -** -** This routine just deletes the data structure. It does not unlink -** the table data structure from the hash table. Nor does it remove -** foreign keys from the sqlite.aFKey hash table. But it does destroy -** memory structures of the indices and foreign keys associated with -** the table. -** -** Indices associated with the table are unlinked from the "db" -** data structure if db!=NULL. If db==NULL, indices attached to -** the table are deleted, but it is assumed they have already been -** unlinked. -*/ -void sqlite3DeleteTable(sqlite3 *db, Table *pTable){ - Index *pIndex, *pNext; - FKey *pFKey, *pNextFKey; - - db = 0; - - if( pTable==0 ) return; - - /* Do not delete the table until the reference count reaches zero. */ - pTable->nRef--; - if( pTable->nRef>0 ){ - return; - } - assert( pTable->nRef==0 ); - - /* Delete all indices associated with this table - */ - for(pIndex = pTable->pIndex; pIndex; pIndex=pNext){ - pNext = pIndex->pNext; - assert( pIndex->pSchema==pTable->pSchema ); - sqliteDeleteIndex(pIndex); - } - -#ifndef SQLITE_OMIT_FOREIGN_KEY - /* Delete all foreign keys associated with this table. The keys - ** should have already been unlinked from the db->aFKey hash table - */ - for(pFKey=pTable->pFKey; pFKey; pFKey=pNextFKey){ - pNextFKey = pFKey->pNextFrom; - assert( sqlite3HashFind(&pTable->pSchema->aFKey, - pFKey->zTo, strlen(pFKey->zTo)+1)!=pFKey ); - sqliteFree(pFKey); - } -#endif - - /* Delete the Table structure itself. - */ - sqliteResetColumnNames(pTable); - sqliteFree(pTable->zName); - sqliteFree(pTable->zColAff); - sqlite3SelectDelete(pTable->pSelect); -#ifndef SQLITE_OMIT_CHECK - sqlite3ExprDelete(pTable->pCheck); -#endif - sqlite3VtabClear(pTable); - sqliteFree(pTable); -} - -/* -** Unlink the given table from the hash tables and the delete the -** table structure with all its indices and foreign keys. -*/ -void sqlite3UnlinkAndDeleteTable(sqlite3 *db, int iDb, const char *zTabName){ - Table *p; - FKey *pF1, *pF2; - Db *pDb; - - assert( db!=0 ); - assert( iDb>=0 && iDb<db->nDb ); - assert( zTabName && zTabName[0] ); - pDb = &db->aDb[iDb]; - p = sqlite3HashInsert(&pDb->pSchema->tblHash, zTabName, strlen(zTabName)+1,0); - if( p ){ -#ifndef SQLITE_OMIT_FOREIGN_KEY - for(pF1=p->pFKey; pF1; pF1=pF1->pNextFrom){ - int nTo = strlen(pF1->zTo) + 1; - pF2 = sqlite3HashFind(&pDb->pSchema->aFKey, pF1->zTo, nTo); - if( pF2==pF1 ){ - sqlite3HashInsert(&pDb->pSchema->aFKey, pF1->zTo, nTo, pF1->pNextTo); - }else{ - while( pF2 && pF2->pNextTo!=pF1 ){ pF2=pF2->pNextTo; } - if( pF2 ){ - pF2->pNextTo = pF1->pNextTo; - } - } - } -#endif - sqlite3DeleteTable(db, p); - } - db->flags |= SQLITE_InternChanges; -} - -/* -** Given a token, return a string that consists of the text of that -** token with any quotations removed. Space to hold the returned string -** is obtained from sqliteMalloc() and must be freed by the calling -** function. -** -** Tokens are often just pointers into the original SQL text and so -** are not \000 terminated and are not persistent. The returned string -** is \000 terminated and is persistent. -*/ -char *sqlite3NameFromToken(Token *pName){ - char *zName; - if( pName ){ - zName = sqliteStrNDup((char*)pName->z, pName->n); - sqlite3Dequote(zName); - }else{ - zName = 0; - } - return zName; -} - -/* -** Open the sqlite_master table stored in database number iDb for -** writing. The table is opened using cursor 0. -*/ -void sqlite3OpenMasterTable(Parse *p, int iDb){ - Vdbe *v = sqlite3GetVdbe(p); - sqlite3TableLock(p, iDb, MASTER_ROOT, 1, SCHEMA_TABLE(iDb)); - sqlite3VdbeAddOp(v, OP_Integer, iDb, 0); - sqlite3VdbeAddOp(v, OP_OpenWrite, 0, MASTER_ROOT); - sqlite3VdbeAddOp(v, OP_SetNumColumns, 0, 5); /* sqlite_master has 5 columns */ -} - -/* -** The token *pName contains the name of a database (either "main" or -** "temp" or the name of an attached db). This routine returns the -** index of the named database in db->aDb[], or -1 if the named db -** does not exist. -*/ -int sqlite3FindDb(sqlite3 *db, Token *pName){ - int i = -1; /* Database number */ - int n; /* Number of characters in the name */ - Db *pDb; /* A database whose name space is being searched */ - char *zName; /* Name we are searching for */ - - zName = sqlite3NameFromToken(pName); - if( zName ){ - n = strlen(zName); - for(i=(db->nDb-1), pDb=&db->aDb[i]; i>=0; i--, pDb--){ - if( (!OMIT_TEMPDB || i!=1 ) && n==strlen(pDb->zName) && - 0==sqlite3StrICmp(pDb->zName, zName) ){ - break; - } - } - sqliteFree(zName); - } - return i; -} - -/* The table or view or trigger name is passed to this routine via tokens -** pName1 and pName2. If the table name was fully qualified, for example: -** -** CREATE TABLE xxx.yyy (...); -** -** Then pName1 is set to "xxx" and pName2 "yyy". On the other hand if -** the table name is not fully qualified, i.e.: -** -** CREATE TABLE yyy(...); -** -** Then pName1 is set to "yyy" and pName2 is "". -** -** This routine sets the *ppUnqual pointer to point at the token (pName1 or -** pName2) that stores the unqualified table name. The index of the -** database "xxx" is returned. -*/ -int sqlite3TwoPartName( - Parse *pParse, /* Parsing and code generating context */ - Token *pName1, /* The "xxx" in the name "xxx.yyy" or "xxx" */ - Token *pName2, /* The "yyy" in the name "xxx.yyy" */ - Token **pUnqual /* Write the unqualified object name here */ -){ - int iDb; /* Database holding the object */ - sqlite3 *db = pParse->db; - - if( pName2 && pName2->n>0 ){ - assert( !db->init.busy ); - *pUnqual = pName2; - iDb = sqlite3FindDb(db, pName1); - if( iDb<0 ){ - sqlite3ErrorMsg(pParse, "unknown database %T", pName1); - pParse->nErr++; - return -1; - } - }else{ - assert( db->init.iDb==0 || db->init.busy ); - iDb = db->init.iDb; - *pUnqual = pName1; - } - return iDb; -} - -/* -** This routine is used to check if the UTF-8 string zName is a legal -** unqualified name for a new schema object (table, index, view or -** trigger). All names are legal except those that begin with the string -** "sqlite_" (in upper, lower or mixed case). This portion of the namespace -** is reserved for internal use. -*/ -int sqlite3CheckObjectName(Parse *pParse, const char *zName){ - if( !pParse->db->init.busy && pParse->nested==0 - && (pParse->db->flags & SQLITE_WriteSchema)==0 - && 0==sqlite3StrNICmp(zName, "sqlite_", 7) ){ - sqlite3ErrorMsg(pParse, "object name reserved for internal use: %s", zName); - return SQLITE_ERROR; - } - return SQLITE_OK; -} - -/* -** Begin constructing a new table representation in memory. This is -** the first of several action routines that get called in response -** to a CREATE TABLE statement. In particular, this routine is called -** after seeing tokens "CREATE" and "TABLE" and the table name. The isTemp -** flag is true if the table should be stored in the auxiliary database -** file instead of in the main database file. This is normally the case -** when the "TEMP" or "TEMPORARY" keyword occurs in between -** CREATE and TABLE. -** -** The new table record is initialized and put in pParse->pNewTable. -** As more of the CREATE TABLE statement is parsed, additional action -** routines will be called to add more information to this record. -** At the end of the CREATE TABLE statement, the sqlite3EndTable() routine -** is called to complete the construction of the new table record. -*/ -void sqlite3StartTable( - Parse *pParse, /* Parser context */ - Token *pName1, /* First part of the name of the table or view */ - Token *pName2, /* Second part of the name of the table or view */ - int isTemp, /* True if this is a TEMP table */ - int isView, /* True if this is a VIEW */ - int isVirtual, /* True if this is a VIRTUAL table */ - int noErr /* Do nothing if table already exists */ -){ - Table *pTable; - char *zName = 0; /* The name of the new table */ - sqlite3 *db = pParse->db; - Vdbe *v; - int iDb; /* Database number to create the table in */ - Token *pName; /* Unqualified name of the table to create */ - - /* The table or view name to create is passed to this routine via tokens - ** pName1 and pName2. If the table name was fully qualified, for example: - ** - ** CREATE TABLE xxx.yyy (...); - ** - ** Then pName1 is set to "xxx" and pName2 "yyy". On the other hand if - ** the table name is not fully qualified, i.e.: - ** - ** CREATE TABLE yyy(...); - ** - ** Then pName1 is set to "yyy" and pName2 is "". - ** - ** The call below sets the pName pointer to point at the token (pName1 or - ** pName2) that stores the unqualified table name. The variable iDb is - ** set to the index of the database that the table or view is to be - ** created in. - */ - iDb = sqlite3TwoPartName(pParse, pName1, pName2, &pName); - if( iDb<0 ) return; - if( !OMIT_TEMPDB && isTemp && iDb>1 ){ - /* If creating a temp table, the name may not be qualified */ - sqlite3ErrorMsg(pParse, "temporary table name must be unqualified"); - return; - } - if( !OMIT_TEMPDB && isTemp ) iDb = 1; - - pParse->sNameToken = *pName; - zName = sqlite3NameFromToken(pName); - if( zName==0 ) return; - if( SQLITE_OK!=sqlite3CheckObjectName(pParse, zName) ){ - goto begin_table_error; - } - if( db->init.iDb==1 ) isTemp = 1; -#ifndef SQLITE_OMIT_AUTHORIZATION - assert( (isTemp & 1)==isTemp ); - { - int code; - char *zDb = db->aDb[iDb].zName; - if( sqlite3AuthCheck(pParse, SQLITE_INSERT, SCHEMA_TABLE(isTemp), 0, zDb) ){ - goto begin_table_error; - } - if( isView ){ - if( !OMIT_TEMPDB && isTemp ){ - code = SQLITE_CREATE_TEMP_VIEW; - }else{ - code = SQLITE_CREATE_VIEW; - } - }else{ - if( !OMIT_TEMPDB && isTemp ){ - code = SQLITE_CREATE_TEMP_TABLE; - }else{ - code = SQLITE_CREATE_TABLE; - } - } - if( !isVirtual && sqlite3AuthCheck(pParse, code, zName, 0, zDb) ){ - goto begin_table_error; - } - } -#endif - - /* Make sure the new table name does not collide with an existing - ** index or table name in the same database. Issue an error message if - ** it does. The exception is if the statement being parsed was passed - ** to an sqlite3_declare_vtab() call. In that case only the column names - ** and types will be used, so there is no need to test for namespace - ** collisions. - */ - if( !IN_DECLARE_VTAB ){ - if( SQLITE_OK!=sqlite3ReadSchema(pParse) ){ - goto begin_table_error; - } - pTable = sqlite3FindTable(db, zName, db->aDb[iDb].zName); - if( pTable ){ - if( !noErr ){ - sqlite3ErrorMsg(pParse, "table %T already exists", pName); - } - goto begin_table_error; - } - if( sqlite3FindIndex(db, zName, 0)!=0 && (iDb==0 || !db->init.busy) ){ - sqlite3ErrorMsg(pParse, "there is already an index named %s", zName); - goto begin_table_error; - } - } - - pTable = sqliteMalloc( sizeof(Table) ); - if( pTable==0 ){ - pParse->rc = SQLITE_NOMEM; - pParse->nErr++; - goto begin_table_error; - } - pTable->zName = zName; - pTable->iPKey = -1; - pTable->pSchema = db->aDb[iDb].pSchema; - pTable->nRef = 1; - if( pParse->pNewTable ) sqlite3DeleteTable(db, pParse->pNewTable); - pParse->pNewTable = pTable; - - /* If this is the magic sqlite_sequence table used by autoincrement, - ** then record a pointer to this table in the main database structure - ** so that INSERT can find the table easily. - */ -#ifndef SQLITE_OMIT_AUTOINCREMENT - if( !pParse->nested && strcmp(zName, "sqlite_sequence")==0 ){ - pTable->pSchema->pSeqTab = pTable; - } -#endif - - /* Begin generating the code that will insert the table record into - ** the SQLITE_MASTER table. Note in particular that we must go ahead - ** and allocate the record number for the table entry now. Before any - ** PRIMARY KEY or UNIQUE keywords are parsed. Those keywords will cause - ** indices to be created and the table record must come before the - ** indices. Hence, the record number for the table must be allocated - ** now. - */ - if( !db->init.busy && (v = sqlite3GetVdbe(pParse))!=0 ){ - int lbl; - int fileFormat; - sqlite3BeginWriteOperation(pParse, 0, iDb); - -#ifndef SQLITE_OMIT_VIRTUALTABLE - if( isVirtual ){ - sqlite3VdbeAddOp(v, OP_VBegin, 0, 0); - } -#endif - - /* If the file format and encoding in the database have not been set, - ** set them now. - */ - sqlite3VdbeAddOp(v, OP_ReadCookie, iDb, 1); /* file_format */ - lbl = sqlite3VdbeMakeLabel(v); - sqlite3VdbeAddOp(v, OP_If, 0, lbl); - fileFormat = (db->flags & SQLITE_LegacyFileFmt)!=0 ? - 1 : SQLITE_MAX_FILE_FORMAT; - sqlite3VdbeAddOp(v, OP_Integer, fileFormat, 0); - sqlite3VdbeAddOp(v, OP_SetCookie, iDb, 1); - sqlite3VdbeAddOp(v, OP_Integer, ENC(db), 0); - sqlite3VdbeAddOp(v, OP_SetCookie, iDb, 4); - sqlite3VdbeResolveLabel(v, lbl); - - /* This just creates a place-holder record in the sqlite_master table. - ** The record created does not contain anything yet. It will be replaced - ** by the real entry in code generated at sqlite3EndTable(). - ** - ** The rowid for the new entry is left on the top of the stack. - ** The rowid value is needed by the code that sqlite3EndTable will - ** generate. - */ -#if !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_VIRTUALTABLE) - if( isView || isVirtual ){ - sqlite3VdbeAddOp(v, OP_Integer, 0, 0); - }else -#endif - { - sqlite3VdbeAddOp(v, OP_CreateTable, iDb, 0); - } - sqlite3OpenMasterTable(pParse, iDb); - sqlite3VdbeAddOp(v, OP_NewRowid, 0, 0); - sqlite3VdbeAddOp(v, OP_Dup, 0, 0); - sqlite3VdbeAddOp(v, OP_Null, 0, 0); - sqlite3VdbeAddOp(v, OP_Insert, 0, 0); - sqlite3VdbeAddOp(v, OP_Close, 0, 0); - sqlite3VdbeAddOp(v, OP_Pull, 1, 0); - } - - /* Normal (non-error) return. */ - return; - - /* If an error occurs, we jump here */ -begin_table_error: - sqliteFree(zName); - return; -} - -/* -** This macro is used to compare two strings in a case-insensitive manner. -** It is slightly faster than calling sqlite3StrICmp() directly, but -** produces larger code. -** -** WARNING: This macro is not compatible with the strcmp() family. It -** returns true if the two strings are equal, otherwise false. -*/ -#define STRICMP(x, y) (\ -sqlite3UpperToLower[*(unsigned char *)(x)]== \ -sqlite3UpperToLower[*(unsigned char *)(y)] \ -&& sqlite3StrICmp((x)+1,(y)+1)==0 ) - -/* -** Add a new column to the table currently being constructed. -** -** The parser calls this routine once for each column declaration -** in a CREATE TABLE statement. sqlite3StartTable() gets called -** first to get things going. Then this routine is called for each -** column. -*/ -void sqlite3AddColumn(Parse *pParse, Token *pName){ - Table *p; - int i; - char *z; - Column *pCol; - if( (p = pParse->pNewTable)==0 ) return; - z = sqlite3NameFromToken(pName); - if( z==0 ) return; - for(i=0; i<p->nCol; i++){ - if( STRICMP(z, p->aCol[i].zName) ){ - sqlite3ErrorMsg(pParse, "duplicate column name: %s", z); - sqliteFree(z); - return; - } - } - if( (p->nCol & 0x7)==0 ){ - Column *aNew; - aNew = sqliteRealloc( p->aCol, (p->nCol+8)*sizeof(p->aCol[0])); - if( aNew==0 ){ - sqliteFree(z); - return; - } - p->aCol = aNew; - } - pCol = &p->aCol[p->nCol]; - memset(pCol, 0, sizeof(p->aCol[0])); - pCol->zName = z; - - /* If there is no type specified, columns have the default affinity - ** 'NONE'. If there is a type specified, then sqlite3AddColumnType() will - ** be called next to set pCol->affinity correctly. - */ - pCol->affinity = SQLITE_AFF_NONE; - p->nCol++; -} - -/* -** This routine is called by the parser while in the middle of -** parsing a CREATE TABLE statement. A "NOT NULL" constraint has -** been seen on a column. This routine sets the notNull flag on -** the column currently under construction. -*/ -void sqlite3AddNotNull(Parse *pParse, int onError){ - Table *p; - int i; - if( (p = pParse->pNewTable)==0 ) return; - i = p->nCol-1; - if( i>=0 ) p->aCol[i].notNull = onError; -} - -/* -** Scan the column type name zType (length nType) and return the -** associated affinity type. -** -** This routine does a case-independent search of zType for the -** substrings in the following table. If one of the substrings is -** found, the corresponding affinity is returned. If zType contains -** more than one of the substrings, entries toward the top of -** the table take priority. For example, if zType is 'BLOBINT', -** SQLITE_AFF_INTEGER is returned. -** -** Substring | Affinity -** -------------------------------- -** 'INT' | SQLITE_AFF_INTEGER -** 'CHAR' | SQLITE_AFF_TEXT -** 'CLOB' | SQLITE_AFF_TEXT -** 'TEXT' | SQLITE_AFF_TEXT -** 'BLOB' | SQLITE_AFF_NONE -** 'REAL' | SQLITE_AFF_REAL -** 'FLOA' | SQLITE_AFF_REAL -** 'DOUB' | SQLITE_AFF_REAL -** -** If none of the substrings in the above table are found, -** SQLITE_AFF_NUMERIC is returned. -*/ -char sqlite3AffinityType(const Token *pType){ - u32 h = 0; - char aff = SQLITE_AFF_NUMERIC; - const unsigned char *zIn = pType->z; - const unsigned char *zEnd = &pType->z[pType->n]; - - while( zIn!=zEnd ){ - h = (h<<8) + sqlite3UpperToLower[*zIn]; - zIn++; - if( h==(('c'<<24)+('h'<<16)+('a'<<8)+'r') ){ /* CHAR */ - aff = SQLITE_AFF_TEXT; - }else if( h==(('c'<<24)+('l'<<16)+('o'<<8)+'b') ){ /* CLOB */ - aff = SQLITE_AFF_TEXT; - }else if( h==(('t'<<24)+('e'<<16)+('x'<<8)+'t') ){ /* TEXT */ - aff = SQLITE_AFF_TEXT; - }else if( h==(('b'<<24)+('l'<<16)+('o'<<8)+'b') /* BLOB */ - && (aff==SQLITE_AFF_NUMERIC || aff==SQLITE_AFF_REAL) ){ - aff = SQLITE_AFF_NONE; -#ifndef SQLITE_OMIT_FLOATING_POINT - }else if( h==(('r'<<24)+('e'<<16)+('a'<<8)+'l') /* REAL */ - && aff==SQLITE_AFF_NUMERIC ){ - aff = SQLITE_AFF_REAL; - }else if( h==(('f'<<24)+('l'<<16)+('o'<<8)+'a') /* FLOA */ - && aff==SQLITE_AFF_NUMERIC ){ - aff = SQLITE_AFF_REAL; - }else if( h==(('d'<<24)+('o'<<16)+('u'<<8)+'b') /* DOUB */ - && aff==SQLITE_AFF_NUMERIC ){ - aff = SQLITE_AFF_REAL; -#endif - }else if( (h&0x00FFFFFF)==(('i'<<16)+('n'<<8)+'t') ){ /* INT */ - aff = SQLITE_AFF_INTEGER; - break; - } - } - - return aff; -} - -/* -** This routine is called by the parser while in the middle of -** parsing a CREATE TABLE statement. The pFirst token is the first -** token in the sequence of tokens that describe the type of the -** column currently under construction. pLast is the last token -** in the sequence. Use this information to construct a string -** that contains the typename of the column and store that string -** in zType. -*/ -void sqlite3AddColumnType(Parse *pParse, Token *pType){ - Table *p; - int i; - Column *pCol; - - if( (p = pParse->pNewTable)==0 ) return; - i = p->nCol-1; - if( i<0 ) return; - pCol = &p->aCol[i]; - sqliteFree(pCol->zType); - pCol->zType = sqlite3NameFromToken(pType); - pCol->affinity = sqlite3AffinityType(pType); -} - -/* -** The expression is the default value for the most recently added column -** of the table currently under construction. -** -** Default value expressions must be constant. Raise an exception if this -** is not the case. -** -** This routine is called by the parser while in the middle of -** parsing a CREATE TABLE statement. -*/ -void sqlite3AddDefaultValue(Parse *pParse, Expr *pExpr){ - Table *p; - Column *pCol; - if( (p = pParse->pNewTable)!=0 ){ - pCol = &(p->aCol[p->nCol-1]); - if( !sqlite3ExprIsConstantOrFunction(pExpr) ){ - sqlite3ErrorMsg(pParse, "default value of column [%s] is not constant", - pCol->zName); - }else{ - sqlite3ExprDelete(pCol->pDflt); - pCol->pDflt = sqlite3ExprDup(pExpr); - } - } - sqlite3ExprDelete(pExpr); -} - -/* -** Designate the PRIMARY KEY for the table. pList is a list of names -** of columns that form the primary key. If pList is NULL, then the -** most recently added column of the table is the primary key. -** -** A table can have at most one primary key. If the table already has -** a primary key (and this is the second primary key) then create an -** error. -** -** If the PRIMARY KEY is on a single column whose datatype is INTEGER, -** then we will try to use that column as the rowid. Set the Table.iPKey -** field of the table under construction to be the index of the -** INTEGER PRIMARY KEY column. Table.iPKey is set to -1 if there is -** no INTEGER PRIMARY KEY. -** -** If the key is not an INTEGER PRIMARY KEY, then create a unique -** index for the key. No index is created for INTEGER PRIMARY KEYs. -*/ -void sqlite3AddPrimaryKey( - Parse *pParse, /* Parsing context */ - ExprList *pList, /* List of field names to be indexed */ - int onError, /* What to do with a uniqueness conflict */ - int autoInc, /* True if the AUTOINCREMENT keyword is present */ - int sortOrder /* SQLITE_SO_ASC or SQLITE_SO_DESC */ -){ - Table *pTab = pParse->pNewTable; - char *zType = 0; - int iCol = -1, i; - if( pTab==0 || IN_DECLARE_VTAB ) goto primary_key_exit; - if( pTab->hasPrimKey ){ - sqlite3ErrorMsg(pParse, - "table \"%s\" has more than one primary key", pTab->zName); - goto primary_key_exit; - } - pTab->hasPrimKey = 1; - if( pList==0 ){ - iCol = pTab->nCol - 1; - pTab->aCol[iCol].isPrimKey = 1; - }else{ - for(i=0; i<pList->nExpr; i++){ - for(iCol=0; iCol<pTab->nCol; iCol++){ - if( sqlite3StrICmp(pList->a[i].zName, pTab->aCol[iCol].zName)==0 ){ - break; - } - } - if( iCol<pTab->nCol ){ - pTab->aCol[iCol].isPrimKey = 1; - } - } - if( pList->nExpr>1 ) iCol = -1; - } - if( iCol>=0 && iCol<pTab->nCol ){ - zType = pTab->aCol[iCol].zType; - } - if( zType && sqlite3StrICmp(zType, "INTEGER")==0 - && sortOrder==SQLITE_SO_ASC ){ - pTab->iPKey = iCol; - pTab->keyConf = onError; - pTab->autoInc = autoInc; - }else if( autoInc ){ -#ifndef SQLITE_OMIT_AUTOINCREMENT - sqlite3ErrorMsg(pParse, "AUTOINCREMENT is only allowed on an " - "INTEGER PRIMARY KEY"); -#endif - }else{ - sqlite3CreateIndex(pParse, 0, 0, 0, pList, onError, 0, 0, sortOrder, 0); - pList = 0; - } - -primary_key_exit: - sqlite3ExprListDelete(pList); - return; -} - -/* -** Add a new CHECK constraint to the table currently under construction. -*/ -void sqlite3AddCheckConstraint( - Parse *pParse, /* Parsing context */ - Expr *pCheckExpr /* The check expression */ -){ -#ifndef SQLITE_OMIT_CHECK - Table *pTab = pParse->pNewTable; - if( pTab && !IN_DECLARE_VTAB ){ - /* The CHECK expression must be duplicated so that tokens refer - ** to malloced space and not the (ephemeral) text of the CREATE TABLE - ** statement */ - pTab->pCheck = sqlite3ExprAnd(pTab->pCheck, sqlite3ExprDup(pCheckExpr)); - } -#endif - sqlite3ExprDelete(pCheckExpr); -} - -/* -** Set the collation function of the most recently parsed table column -** to the CollSeq given. -*/ -void sqlite3AddCollateType(Parse *pParse, const char *zType, int nType){ - Table *p; - int i; - - if( (p = pParse->pNewTable)==0 ) return; - i = p->nCol-1; - - if( sqlite3LocateCollSeq(pParse, zType, nType) ){ - Index *pIdx; - p->aCol[i].zColl = sqliteStrNDup(zType, nType); - - /* If the column is declared as "<name> PRIMARY KEY COLLATE <type>", - ** then an index may have been created on this column before the - ** collation type was added. Correct this if it is the case. - */ - for(pIdx=p->pIndex; pIdx; pIdx=pIdx->pNext){ - assert( pIdx->nColumn==1 ); - if( pIdx->aiColumn[0]==i ){ - pIdx->azColl[0] = p->aCol[i].zColl; - } - } - } -} - -/* -** This function returns the collation sequence for database native text -** encoding identified by the string zName, length nName. -** -** If the requested collation sequence is not available, or not available -** in the database native encoding, the collation factory is invoked to -** request it. If the collation factory does not supply such a sequence, -** and the sequence is available in another text encoding, then that is -** returned instead. -** -** If no versions of the requested collations sequence are available, or -** another error occurs, NULL is returned and an error message written into -** pParse. -*/ -CollSeq *sqlite3LocateCollSeq(Parse *pParse, const char *zName, int nName){ - sqlite3 *db = pParse->db; - u8 enc = ENC(db); - u8 initbusy = db->init.busy; - CollSeq *pColl; - - pColl = sqlite3FindCollSeq(db, enc, zName, nName, initbusy); - if( !initbusy && (!pColl || !pColl->xCmp) ){ - pColl = sqlite3GetCollSeq(db, pColl, zName, nName); - if( !pColl ){ - if( nName<0 ){ - nName = strlen(zName); - } - sqlite3ErrorMsg(pParse, "no such collation sequence: %.*s", nName, zName); - pColl = 0; - } - } - - return pColl; -} - - -/* -** Generate code that will increment the schema cookie. -** -** The schema cookie is used to determine when the schema for the -** database changes. After each schema change, the cookie value -** changes. When a process first reads the schema it records the -** cookie. Thereafter, whenever it goes to access the database, -** it checks the cookie to make sure the schema has not changed -** since it was last read. -** -** This plan is not completely bullet-proof. It is possible for -** the schema to change multiple times and for the cookie to be -** set back to prior value. But schema changes are infrequent -** and the probability of hitting the same cookie value is only -** 1 chance in 2^32. So we're safe enough. -*/ -void sqlite3ChangeCookie(sqlite3 *db, Vdbe *v, int iDb){ - sqlite3VdbeAddOp(v, OP_Integer, db->aDb[iDb].pSchema->schema_cookie+1, 0); - sqlite3VdbeAddOp(v, OP_SetCookie, iDb, 0); -} - -/* -** Measure the number of characters needed to output the given -** identifier. The number returned includes any quotes used -** but does not include the null terminator. -** -** The estimate is conservative. It might be larger that what is -** really needed. -*/ -static int identLength(const char *z){ - int n; - for(n=0; *z; n++, z++){ - if( *z=='"' ){ n++; } - } - return n + 2; -} - -/* -** Write an identifier onto the end of the given string. Add -** quote characters as needed. -*/ -static void identPut(char *z, int *pIdx, char *zSignedIdent){ - unsigned char *zIdent = (unsigned char*)zSignedIdent; - int i, j, needQuote; - i = *pIdx; - for(j=0; zIdent[j]; j++){ - if( !isalnum(zIdent[j]) && zIdent[j]!='_' ) break; - } - needQuote = zIdent[j]!=0 || isdigit(zIdent[0]) - || sqlite3KeywordCode(zIdent, j)!=TK_ID; - if( needQuote ) z[i++] = '"'; - for(j=0; zIdent[j]; j++){ - z[i++] = zIdent[j]; - if( zIdent[j]=='"' ) z[i++] = '"'; - } - if( needQuote ) z[i++] = '"'; - z[i] = 0; - *pIdx = i; -} - -/* -** Generate a CREATE TABLE statement appropriate for the given -** table. Memory to hold the text of the statement is obtained -** from sqliteMalloc() and must be freed by the calling function. -*/ -static char *createTableStmt(Table *p, int isTemp){ - int i, k, n; - char *zStmt; - char *zSep, *zSep2, *zEnd, *z; - Column *pCol; - n = 0; - for(pCol = p->aCol, i=0; i<p->nCol; i++, pCol++){ - n += identLength(pCol->zName); - z = pCol->zType; - if( z ){ - n += (strlen(z) + 1); - } - } - n += identLength(p->zName); - if( n<50 ){ - zSep = ""; - zSep2 = ","; - zEnd = ")"; - }else{ - zSep = "\n "; - zSep2 = ",\n "; - zEnd = "\n)"; - } - n += 35 + 6*p->nCol; - zStmt = sqliteMallocRaw( n ); - if( zStmt==0 ) return 0; - strcpy(zStmt, !OMIT_TEMPDB&&isTemp ? "CREATE TEMP TABLE ":"CREATE TABLE "); - k = strlen(zStmt); - identPut(zStmt, &k, p->zName); - zStmt[k++] = '('; - for(pCol=p->aCol, i=0; i<p->nCol; i++, pCol++){ - strcpy(&zStmt[k], zSep); - k += strlen(&zStmt[k]); - zSep = zSep2; - identPut(zStmt, &k, pCol->zName); - if( (z = pCol->zType)!=0 ){ - zStmt[k++] = ' '; - strcpy(&zStmt[k], z); - k += strlen(z); - } - } - strcpy(&zStmt[k], zEnd); - return zStmt; -} - -/* -** This routine is called to report the final ")" that terminates -** a CREATE TABLE statement. -** -** The table structure that other action routines have been building -** is added to the internal hash tables, assuming no errors have -** occurred. -** -** An entry for the table is made in the master table on disk, unless -** this is a temporary table or db->init.busy==1. When db->init.busy==1 -** it means we are reading the sqlite_master table because we just -** connected to the database or because the sqlite_master table has -** recently changed, so the entry for this table already exists in -** the sqlite_master table. We do not want to create it again. -** -** If the pSelect argument is not NULL, it means that this routine -** was called to create a table generated from a -** "CREATE TABLE ... AS SELECT ..." statement. The column names of -** the new table will match the result set of the SELECT. -*/ -void sqlite3EndTable( - Parse *pParse, /* Parse context */ - Token *pCons, /* The ',' token after the last column defn. */ - Token *pEnd, /* The final ')' token in the CREATE TABLE */ - Select *pSelect /* Select from a "CREATE ... AS SELECT" */ -){ - Table *p; - sqlite3 *db = pParse->db; - int iDb; - - if( (pEnd==0 && pSelect==0) || pParse->nErr || sqlite3MallocFailed() ) { - return; - } - p = pParse->pNewTable; - if( p==0 ) return; - - assert( !db->init.busy || !pSelect ); - - iDb = sqlite3SchemaToIndex(db, p->pSchema); - -#ifndef SQLITE_OMIT_CHECK - /* Resolve names in all CHECK constraint expressions. - */ - if( p->pCheck ){ - SrcList sSrc; /* Fake SrcList for pParse->pNewTable */ - NameContext sNC; /* Name context for pParse->pNewTable */ - - memset(&sNC, 0, sizeof(sNC)); - memset(&sSrc, 0, sizeof(sSrc)); - sSrc.nSrc = 1; - sSrc.a[0].zName = p->zName; - sSrc.a[0].pTab = p; - sSrc.a[0].iCursor = -1; - sNC.pParse = pParse; - sNC.pSrcList = &sSrc; - sNC.isCheck = 1; - if( sqlite3ExprResolveNames(&sNC, p->pCheck) ){ - return; - } - } -#endif /* !defined(SQLITE_OMIT_CHECK) */ - - /* If the db->init.busy is 1 it means we are reading the SQL off the - ** "sqlite_master" or "sqlite_temp_master" table on the disk. - ** So do not write to the disk again. Extract the root page number - ** for the table from the db->init.newTnum field. (The page number - ** should have been put there by the sqliteOpenCb routine.) - */ - if( db->init.busy ){ - p->tnum = db->init.newTnum; - } - - /* If not initializing, then create a record for the new table - ** in the SQLITE_MASTER table of the database. The record number - ** for the new table entry should already be on the stack. - ** - ** If this is a TEMPORARY table, write the entry into the auxiliary - ** file instead of into the main database file. - */ - if( !db->init.busy ){ - int n; - Vdbe *v; - char *zType; /* "view" or "table" */ - char *zType2; /* "VIEW" or "TABLE" */ - char *zStmt; /* Text of the CREATE TABLE or CREATE VIEW statement */ - - v = sqlite3GetVdbe(pParse); - if( v==0 ) return; - - sqlite3VdbeAddOp(v, OP_Close, 0, 0); - - /* Create the rootpage for the new table and push it onto the stack. - ** A view has no rootpage, so just push a zero onto the stack for - ** views. Initialize zType at the same time. - */ - if( p->pSelect==0 ){ - /* A regular table */ - zType = "table"; - zType2 = "TABLE"; -#ifndef SQLITE_OMIT_VIEW - }else{ - /* A view */ - zType = "view"; - zType2 = "VIEW"; -#endif - } - - /* If this is a CREATE TABLE xx AS SELECT ..., execute the SELECT - ** statement to populate the new table. The root-page number for the - ** new table is on the top of the vdbe stack. - ** - ** Once the SELECT has been coded by sqlite3Select(), it is in a - ** suitable state to query for the column names and types to be used - ** by the new table. - ** - ** A shared-cache write-lock is not required to write to the new table, - ** as a schema-lock must have already been obtained to create it. Since - ** a schema-lock excludes all other database users, the write-lock would - ** be redundant. - */ - if( pSelect ){ - Table *pSelTab; - sqlite3VdbeAddOp(v, OP_Dup, 0, 0); - sqlite3VdbeAddOp(v, OP_Integer, iDb, 0); - sqlite3VdbeAddOp(v, OP_OpenWrite, 1, 0); - pParse->nTab = 2; - sqlite3Select(pParse, pSelect, SRT_Table, 1, 0, 0, 0, 0); - sqlite3VdbeAddOp(v, OP_Close, 1, 0); - if( pParse->nErr==0 ){ - pSelTab = sqlite3ResultSetOfSelect(pParse, 0, pSelect); - if( pSelTab==0 ) return; - assert( p->aCol==0 ); - p->nCol = pSelTab->nCol; - p->aCol = pSelTab->aCol; - pSelTab->nCol = 0; - pSelTab->aCol = 0; - sqlite3DeleteTable(0, pSelTab); - } - } - - /* Compute the complete text of the CREATE statement */ - if( pSelect ){ - zStmt = createTableStmt(p, p->pSchema==pParse->db->aDb[1].pSchema); - }else{ - n = pEnd->z - pParse->sNameToken.z + 1; - zStmt = sqlite3MPrintf("CREATE %s %.*s", zType2, n, pParse->sNameToken.z); - } - - /* A slot for the record has already been allocated in the - ** SQLITE_MASTER table. We just need to update that slot with all - ** the information we've collected. The rowid for the preallocated - ** slot is the 2nd item on the stack. The top of the stack is the - ** root page for the new table (or a 0 if this is a view). - */ - sqlite3NestedParse(pParse, - "UPDATE %Q.%s " - "SET type='%s', name=%Q, tbl_name=%Q, rootpage=#0, sql=%Q " - "WHERE rowid=#1", - db->aDb[iDb].zName, SCHEMA_TABLE(iDb), - zType, - p->zName, - p->zName, - zStmt - ); - sqliteFree(zStmt); - sqlite3ChangeCookie(db, v, iDb); - -#ifndef SQLITE_OMIT_AUTOINCREMENT - /* Check to see if we need to create an sqlite_sequence table for - ** keeping track of autoincrement keys. - */ - if( p->autoInc ){ - Db *pDb = &db->aDb[iDb]; - if( pDb->pSchema->pSeqTab==0 ){ - sqlite3NestedParse(pParse, - "CREATE TABLE %Q.sqlite_sequence(name,seq)", - pDb->zName - ); - } - } -#endif - - /* Reparse everything to update our internal data structures */ - sqlite3VdbeOp3(v, OP_ParseSchema, iDb, 0, - sqlite3MPrintf("tbl_name='%q'",p->zName), P3_DYNAMIC); - } - - - /* Add the table to the in-memory representation of the database. - */ - if( db->init.busy && pParse->nErr==0 ){ - Table *pOld; - FKey *pFKey; - Schema *pSchema = p->pSchema; - pOld = sqlite3HashInsert(&pSchema->tblHash, p->zName, strlen(p->zName)+1,p); - if( pOld ){ - assert( p==pOld ); /* Malloc must have failed inside HashInsert() */ - return; - } -#ifndef SQLITE_OMIT_FOREIGN_KEY - for(pFKey=p->pFKey; pFKey; pFKey=pFKey->pNextFrom){ - int nTo = strlen(pFKey->zTo) + 1; - pFKey->pNextTo = sqlite3HashFind(&pSchema->aFKey, pFKey->zTo, nTo); - sqlite3HashInsert(&pSchema->aFKey, pFKey->zTo, nTo, pFKey); - } -#endif - pParse->pNewTable = 0; - db->nTable++; - db->flags |= SQLITE_InternChanges; - -#ifndef SQLITE_OMIT_ALTERTABLE - if( !p->pSelect ){ - const char *zName = (const char *)pParse->sNameToken.z; - int nName; - assert( !pSelect && pCons && pEnd ); - if( pCons->z==0 ){ - pCons = pEnd; - } - nName = (const char *)pCons->z - zName; - p->addColOffset = 13 + sqlite3utf8CharLen(zName, nName); - } -#endif - } -} - -#ifndef SQLITE_OMIT_VIEW -/* -** The parser calls this routine in order to create a new VIEW -*/ -void sqlite3CreateView( - Parse *pParse, /* The parsing context */ - Token *pBegin, /* The CREATE token that begins the statement */ - Token *pName1, /* The token that holds the name of the view */ - Token *pName2, /* The token that holds the name of the view */ - Select *pSelect, /* A SELECT statement that will become the new view */ - int isTemp /* TRUE for a TEMPORARY view */ -){ - Table *p; - int n; - const unsigned char *z; - Token sEnd; - DbFixer sFix; - Token *pName; - int iDb; - - if( pParse->nVar>0 ){ - sqlite3ErrorMsg(pParse, "parameters are not allowed in views"); - sqlite3SelectDelete(pSelect); - return; - } - sqlite3StartTable(pParse, pName1, pName2, isTemp, 1, 0, 0); - p = pParse->pNewTable; - if( p==0 || pParse->nErr ){ - sqlite3SelectDelete(pSelect); - return; - } - sqlite3TwoPartName(pParse, pName1, pName2, &pName); - iDb = sqlite3SchemaToIndex(pParse->db, p->pSchema); - if( sqlite3FixInit(&sFix, pParse, iDb, "view", pName) - && sqlite3FixSelect(&sFix, pSelect) - ){ - sqlite3SelectDelete(pSelect); - return; - } - - /* Make a copy of the entire SELECT statement that defines the view. - ** This will force all the Expr.token.z values to be dynamically - ** allocated rather than point to the input string - which means that - ** they will persist after the current sqlite3_exec() call returns. - */ - p->pSelect = sqlite3SelectDup(pSelect); - sqlite3SelectDelete(pSelect); - if( sqlite3MallocFailed() ){ - return; - } - if( !pParse->db->init.busy ){ - sqlite3ViewGetColumnNames(pParse, p); - } - - /* Locate the end of the CREATE VIEW statement. Make sEnd point to - ** the end. - */ - sEnd = pParse->sLastToken; - if( sEnd.z[0]!=0 && sEnd.z[0]!=';' ){ - sEnd.z += sEnd.n; - } - sEnd.n = 0; - n = sEnd.z - pBegin->z; - z = (const unsigned char*)pBegin->z; - while( n>0 && (z[n-1]==';' || isspace(z[n-1])) ){ n--; } - sEnd.z = &z[n-1]; - sEnd.n = 1; - - /* Use sqlite3EndTable() to add the view to the SQLITE_MASTER table */ - sqlite3EndTable(pParse, 0, &sEnd, 0); - return; -} -#endif /* SQLITE_OMIT_VIEW */ - -#if !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_VIRTUALTABLE) -/* -** The Table structure pTable is really a VIEW. Fill in the names of -** the columns of the view in the pTable structure. Return the number -** of errors. If an error is seen leave an error message in pParse->zErrMsg. -*/ -int sqlite3ViewGetColumnNames(Parse *pParse, Table *pTable){ - Table *pSelTab; /* A fake table from which we get the result set */ - Select *pSel; /* Copy of the SELECT that implements the view */ - int nErr = 0; /* Number of errors encountered */ - int n; /* Temporarily holds the number of cursors assigned */ - - assert( pTable ); - -#ifndef SQLITE_OMIT_VIRTUALTABLE - if( sqlite3VtabCallConnect(pParse, pTable) ){ - return SQLITE_ERROR; - } - if( IsVirtual(pTable) ) return 0; -#endif - -#ifndef SQLITE_OMIT_VIEW - /* A positive nCol means the columns names for this view are - ** already known. - */ - if( pTable->nCol>0 ) return 0; - - /* A negative nCol is a special marker meaning that we are currently - ** trying to compute the column names. If we enter this routine with - ** a negative nCol, it means two or more views form a loop, like this: - ** - ** CREATE VIEW one AS SELECT * FROM two; - ** CREATE VIEW two AS SELECT * FROM one; - ** - ** Actually, this error is caught previously and so the following test - ** should always fail. But we will leave it in place just to be safe. - */ - if( pTable->nCol<0 ){ - sqlite3ErrorMsg(pParse, "view %s is circularly defined", pTable->zName); - return 1; - } - assert( pTable->nCol>=0 ); - - /* If we get this far, it means we need to compute the table names. - ** Note that the call to sqlite3ResultSetOfSelect() will expand any - ** "*" elements in the results set of the view and will assign cursors - ** to the elements of the FROM clause. But we do not want these changes - ** to be permanent. So the computation is done on a copy of the SELECT - ** statement that defines the view. - */ - assert( pTable->pSelect ); - pSel = sqlite3SelectDup(pTable->pSelect); - if( pSel ){ - n = pParse->nTab; - sqlite3SrcListAssignCursors(pParse, pSel->pSrc); - pTable->nCol = -1; - pSelTab = sqlite3ResultSetOfSelect(pParse, 0, pSel); - pParse->nTab = n; - if( pSelTab ){ - assert( pTable->aCol==0 ); - pTable->nCol = pSelTab->nCol; - pTable->aCol = pSelTab->aCol; - pSelTab->nCol = 0; - pSelTab->aCol = 0; - sqlite3DeleteTable(0, pSelTab); - pTable->pSchema->flags |= DB_UnresetViews; - }else{ - pTable->nCol = 0; - nErr++; - } - sqlite3SelectDelete(pSel); - } else { - nErr++; - } -#endif /* SQLITE_OMIT_VIEW */ - return nErr; -} -#endif /* !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_VIRTUALTABLE) */ - -#ifndef SQLITE_OMIT_VIEW -/* -** Clear the column names from every VIEW in database idx. -*/ -static void sqliteViewResetAll(sqlite3 *db, int idx){ - HashElem *i; - if( !DbHasProperty(db, idx, DB_UnresetViews) ) return; - for(i=sqliteHashFirst(&db->aDb[idx].pSchema->tblHash); i;i=sqliteHashNext(i)){ - Table *pTab = sqliteHashData(i); - if( pTab->pSelect ){ - sqliteResetColumnNames(pTab); - } - } - DbClearProperty(db, idx, DB_UnresetViews); -} -#else -# define sqliteViewResetAll(A,B) -#endif /* SQLITE_OMIT_VIEW */ - -/* -** This function is called by the VDBE to adjust the internal schema -** used by SQLite when the btree layer moves a table root page. The -** root-page of a table or index in database iDb has changed from iFrom -** to iTo. -** -** Ticket #1728: The symbol table might still contain information -** on tables and/or indices that are the process of being deleted. -** If you are unlucky, one of those deleted indices or tables might -** have the same rootpage number as the real table or index that is -** being moved. So we cannot stop searching after the first match -** because the first match might be for one of the deleted indices -** or tables and not the table/index that is actually being moved. -** We must continue looping until all tables and indices with -** rootpage==iFrom have been converted to have a rootpage of iTo -** in order to be certain that we got the right one. -*/ -#ifndef SQLITE_OMIT_AUTOVACUUM -void sqlite3RootPageMoved(Db *pDb, int iFrom, int iTo){ - HashElem *pElem; - Hash *pHash; - - pHash = &pDb->pSchema->tblHash; - for(pElem=sqliteHashFirst(pHash); pElem; pElem=sqliteHashNext(pElem)){ - Table *pTab = sqliteHashData(pElem); - if( pTab->tnum==iFrom ){ - pTab->tnum = iTo; - } - } - pHash = &pDb->pSchema->idxHash; - for(pElem=sqliteHashFirst(pHash); pElem; pElem=sqliteHashNext(pElem)){ - Index *pIdx = sqliteHashData(pElem); - if( pIdx->tnum==iFrom ){ - pIdx->tnum = iTo; - } - } -} -#endif - -/* -** Write code to erase the table with root-page iTable from database iDb. -** Also write code to modify the sqlite_master table and internal schema -** if a root-page of another table is moved by the btree-layer whilst -** erasing iTable (this can happen with an auto-vacuum database). -*/ -static void destroyRootPage(Parse *pParse, int iTable, int iDb){ - Vdbe *v = sqlite3GetVdbe(pParse); - sqlite3VdbeAddOp(v, OP_Destroy, iTable, iDb); -#ifndef SQLITE_OMIT_AUTOVACUUM - /* OP_Destroy pushes an integer onto the stack. If this integer - ** is non-zero, then it is the root page number of a table moved to - ** location iTable. The following code modifies the sqlite_master table to - ** reflect this. - ** - ** The "#0" in the SQL is a special constant that means whatever value - ** is on the top of the stack. See sqlite3RegisterExpr(). - */ - sqlite3NestedParse(pParse, - "UPDATE %Q.%s SET rootpage=%d WHERE #0 AND rootpage=#0", - pParse->db->aDb[iDb].zName, SCHEMA_TABLE(iDb), iTable); -#endif -} - -/* -** Write VDBE code to erase table pTab and all associated indices on disk. -** Code to update the sqlite_master tables and internal schema definitions -** in case a root-page belonging to another table is moved by the btree layer -** is also added (this can happen with an auto-vacuum database). -*/ -static void destroyTable(Parse *pParse, Table *pTab){ -#ifdef SQLITE_OMIT_AUTOVACUUM - Index *pIdx; - int iDb = sqlite3SchemaToIndex(pParse->db, pTab->pSchema); - destroyRootPage(pParse, pTab->tnum, iDb); - for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){ - destroyRootPage(pParse, pIdx->tnum, iDb); - } -#else - /* If the database may be auto-vacuum capable (if SQLITE_OMIT_AUTOVACUUM - ** is not defined), then it is important to call OP_Destroy on the - ** table and index root-pages in order, starting with the numerically - ** largest root-page number. This guarantees that none of the root-pages - ** to be destroyed is relocated by an earlier OP_Destroy. i.e. if the - ** following were coded: - ** - ** OP_Destroy 4 0 - ** ... - ** OP_Destroy 5 0 - ** - ** and root page 5 happened to be the largest root-page number in the - ** database, then root page 5 would be moved to page 4 by the - ** "OP_Destroy 4 0" opcode. The subsequent "OP_Destroy 5 0" would hit - ** a free-list page. - */ - int iTab = pTab->tnum; - int iDestroyed = 0; - - while( 1 ){ - Index *pIdx; - int iLargest = 0; - - if( iDestroyed==0 || iTab<iDestroyed ){ - iLargest = iTab; - } - for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){ - int iIdx = pIdx->tnum; - assert( pIdx->pSchema==pTab->pSchema ); - if( (iDestroyed==0 || (iIdx<iDestroyed)) && iIdx>iLargest ){ - iLargest = iIdx; - } - } - if( iLargest==0 ){ - return; - }else{ - int iDb = sqlite3SchemaToIndex(pParse->db, pTab->pSchema); - destroyRootPage(pParse, iLargest, iDb); - iDestroyed = iLargest; - } - } -#endif -} - -/* -** This routine is called to do the work of a DROP TABLE statement. -** pName is the name of the table to be dropped. -*/ -void sqlite3DropTable(Parse *pParse, SrcList *pName, int isView, int noErr){ - Table *pTab; - Vdbe *v; - sqlite3 *db = pParse->db; - int iDb; - - if( pParse->nErr || sqlite3MallocFailed() ){ - goto exit_drop_table; - } - assert( pName->nSrc==1 ); - pTab = sqlite3LocateTable(pParse, pName->a[0].zName, pName->a[0].zDatabase); - - if( pTab==0 ){ - if( noErr ){ - sqlite3ErrorClear(pParse); - } - goto exit_drop_table; - } - iDb = sqlite3SchemaToIndex(db, pTab->pSchema); - assert( iDb>=0 && iDb<db->nDb ); -#ifndef SQLITE_OMIT_AUTHORIZATION - { - int code; - const char *zTab = SCHEMA_TABLE(iDb); - const char *zDb = db->aDb[iDb].zName; - const char *zArg2 = 0; - if( sqlite3AuthCheck(pParse, SQLITE_DELETE, zTab, 0, zDb)){ - goto exit_drop_table; - } - if( isView ){ - if( !OMIT_TEMPDB && iDb==1 ){ - code = SQLITE_DROP_TEMP_VIEW; - }else{ - code = SQLITE_DROP_VIEW; - } -#ifndef SQLITE_OMIT_VIRTUALTABLE - }else if( IsVirtual(pTab) ){ - if( sqlite3ViewGetColumnNames(pParse, pTab) ){ - goto exit_drop_table; - } - code = SQLITE_DROP_VTABLE; - zArg2 = pTab->pMod->zName; -#endif - }else{ - if( !OMIT_TEMPDB && iDb==1 ){ - code = SQLITE_DROP_TEMP_TABLE; - }else{ - code = SQLITE_DROP_TABLE; - } - } - if( sqlite3AuthCheck(pParse, code, pTab->zName, zArg2, zDb) ){ - goto exit_drop_table; - } - if( sqlite3AuthCheck(pParse, SQLITE_DELETE, pTab->zName, 0, zDb) ){ - goto exit_drop_table; - } - } -#endif - if( pTab->readOnly || pTab==db->aDb[iDb].pSchema->pSeqTab ){ - sqlite3ErrorMsg(pParse, "table %s may not be dropped", pTab->zName); - goto exit_drop_table; - } - -#ifndef SQLITE_OMIT_VIEW - /* Ensure DROP TABLE is not used on a view, and DROP VIEW is not used - ** on a table. - */ - if( isView && pTab->pSelect==0 ){ - sqlite3ErrorMsg(pParse, "use DROP TABLE to delete table %s", pTab->zName); - goto exit_drop_table; - } - if( !isView && pTab->pSelect ){ - sqlite3ErrorMsg(pParse, "use DROP VIEW to delete view %s", pTab->zName); - goto exit_drop_table; - } -#endif - - /* Generate code to remove the table from the master table - ** on disk. - */ - v = sqlite3GetVdbe(pParse); - if( v ){ - Trigger *pTrigger; - Db *pDb = &db->aDb[iDb]; - sqlite3BeginWriteOperation(pParse, 0, iDb); - -#ifndef SQLITE_OMIT_VIRTUALTABLE - if( IsVirtual(pTab) ){ - Vdbe *v = sqlite3GetVdbe(pParse); - if( v ){ - sqlite3VdbeAddOp(v, OP_VBegin, 0, 0); - } - } -#endif - - /* Drop all triggers associated with the table being dropped. Code - ** is generated to remove entries from sqlite_master and/or - ** sqlite_temp_master if required. - */ - pTrigger = pTab->pTrigger; - while( pTrigger ){ - assert( pTrigger->pSchema==pTab->pSchema || - pTrigger->pSchema==db->aDb[1].pSchema ); - sqlite3DropTriggerPtr(pParse, pTrigger); - pTrigger = pTrigger->pNext; - } - -#ifndef SQLITE_OMIT_AUTOINCREMENT - /* Remove any entries of the sqlite_sequence table associated with - ** the table being dropped. This is done before the table is dropped - ** at the btree level, in case the sqlite_sequence table needs to - ** move as a result of the drop (can happen in auto-vacuum mode). - */ - if( pTab->autoInc ){ - sqlite3NestedParse(pParse, - "DELETE FROM %s.sqlite_sequence WHERE name=%Q", - pDb->zName, pTab->zName - ); - } -#endif - - /* Drop all SQLITE_MASTER table and index entries that refer to the - ** table. The program name loops through the master table and deletes - ** every row that refers to a table of the same name as the one being - ** dropped. Triggers are handled seperately because a trigger can be - ** created in the temp database that refers to a table in another - ** database. - */ - sqlite3NestedParse(pParse, - "DELETE FROM %Q.%s WHERE tbl_name=%Q and type!='trigger'", - pDb->zName, SCHEMA_TABLE(iDb), pTab->zName); - if( !isView && !IsVirtual(pTab) ){ - destroyTable(pParse, pTab); - } - - /* Remove the table entry from SQLite's internal schema and modify - ** the schema cookie. - */ - if( IsVirtual(pTab) ){ - sqlite3VdbeOp3(v, OP_VDestroy, iDb, 0, pTab->zName, 0); - } - sqlite3VdbeOp3(v, OP_DropTable, iDb, 0, pTab->zName, 0); - sqlite3ChangeCookie(db, v, iDb); - } - sqliteViewResetAll(db, iDb); - -exit_drop_table: - sqlite3SrcListDelete(pName); -} - -/* -** This routine is called to create a new foreign key on the table -** currently under construction. pFromCol determines which columns -** in the current table point to the foreign key. If pFromCol==0 then -** connect the key to the last column inserted. pTo is the name of -** the table referred to. pToCol is a list of tables in the other -** pTo table that the foreign key points to. flags contains all -** information about the conflict resolution algorithms specified -** in the ON DELETE, ON UPDATE and ON INSERT clauses. -** -** An FKey structure is created and added to the table currently -** under construction in the pParse->pNewTable field. The new FKey -** is not linked into db->aFKey at this point - that does not happen -** until sqlite3EndTable(). -** -** The foreign key is set for IMMEDIATE processing. A subsequent call -** to sqlite3DeferForeignKey() might change this to DEFERRED. -*/ -void sqlite3CreateForeignKey( - Parse *pParse, /* Parsing context */ - ExprList *pFromCol, /* Columns in this table that point to other table */ - Token *pTo, /* Name of the other table */ - ExprList *pToCol, /* Columns in the other table */ - int flags /* Conflict resolution algorithms. */ -){ -#ifndef SQLITE_OMIT_FOREIGN_KEY - FKey *pFKey = 0; - Table *p = pParse->pNewTable; - int nByte; - int i; - int nCol; - char *z; - - assert( pTo!=0 ); - if( p==0 || pParse->nErr || IN_DECLARE_VTAB ) goto fk_end; - if( pFromCol==0 ){ - int iCol = p->nCol-1; - if( iCol<0 ) goto fk_end; - if( pToCol && pToCol->nExpr!=1 ){ - sqlite3ErrorMsg(pParse, "foreign key on %s" - " should reference only one column of table %T", - p->aCol[iCol].zName, pTo); - goto fk_end; - } - nCol = 1; - }else if( pToCol && pToCol->nExpr!=pFromCol->nExpr ){ - sqlite3ErrorMsg(pParse, - "number of columns in foreign key does not match the number of " - "columns in the referenced table"); - goto fk_end; - }else{ - nCol = pFromCol->nExpr; - } - nByte = sizeof(*pFKey) + nCol*sizeof(pFKey->aCol[0]) + pTo->n + 1; - if( pToCol ){ - for(i=0; i<pToCol->nExpr; i++){ - nByte += strlen(pToCol->a[i].zName) + 1; - } - } - pFKey = sqliteMalloc( nByte ); - if( pFKey==0 ) goto fk_end; - pFKey->pFrom = p; - pFKey->pNextFrom = p->pFKey; - z = (char*)&pFKey[1]; - pFKey->aCol = (struct sColMap*)z; - z += sizeof(struct sColMap)*nCol; - pFKey->zTo = z; - memcpy(z, pTo->z, pTo->n); - z[pTo->n] = 0; - z += pTo->n+1; - pFKey->pNextTo = 0; - pFKey->nCol = nCol; - if( pFromCol==0 ){ - pFKey->aCol[0].iFrom = p->nCol-1; - }else{ - for(i=0; i<nCol; i++){ - int j; - for(j=0; j<p->nCol; j++){ - if( sqlite3StrICmp(p->aCol[j].zName, pFromCol->a[i].zName)==0 ){ - pFKey->aCol[i].iFrom = j; - break; - } - } - if( j>=p->nCol ){ - sqlite3ErrorMsg(pParse, - "unknown column \"%s\" in foreign key definition", - pFromCol->a[i].zName); - goto fk_end; - } - } - } - if( pToCol ){ - for(i=0; i<nCol; i++){ - int n = strlen(pToCol->a[i].zName); - pFKey->aCol[i].zCol = z; - memcpy(z, pToCol->a[i].zName, n); - z[n] = 0; - z += n+1; - } - } - pFKey->isDeferred = 0; - pFKey->deleteConf = flags & 0xff; - pFKey->updateConf = (flags >> 8 ) & 0xff; - pFKey->insertConf = (flags >> 16 ) & 0xff; - - /* Link the foreign key to the table as the last step. - */ - p->pFKey = pFKey; - pFKey = 0; - -fk_end: - sqliteFree(pFKey); -#endif /* !defined(SQLITE_OMIT_FOREIGN_KEY) */ - sqlite3ExprListDelete(pFromCol); - sqlite3ExprListDelete(pToCol); -} - -/* -** This routine is called when an INITIALLY IMMEDIATE or INITIALLY DEFERRED -** clause is seen as part of a foreign key definition. The isDeferred -** parameter is 1 for INITIALLY DEFERRED and 0 for INITIALLY IMMEDIATE. -** The behavior of the most recently created foreign key is adjusted -** accordingly. -*/ -void sqlite3DeferForeignKey(Parse *pParse, int isDeferred){ -#ifndef SQLITE_OMIT_FOREIGN_KEY - Table *pTab; - FKey *pFKey; - if( (pTab = pParse->pNewTable)==0 || (pFKey = pTab->pFKey)==0 ) return; - pFKey->isDeferred = isDeferred; -#endif -} - -/* -** Generate code that will erase and refill index *pIdx. This is -** used to initialize a newly created index or to recompute the -** content of an index in response to a REINDEX command. -** -** if memRootPage is not negative, it means that the index is newly -** created. The memory cell specified by memRootPage contains the -** root page number of the index. If memRootPage is negative, then -** the index already exists and must be cleared before being refilled and -** the root page number of the index is taken from pIndex->tnum. -*/ -static void sqlite3RefillIndex(Parse *pParse, Index *pIndex, int memRootPage){ - Table *pTab = pIndex->pTable; /* The table that is indexed */ - int iTab = pParse->nTab; /* Btree cursor used for pTab */ - int iIdx = pParse->nTab+1; /* Btree cursor used for pIndex */ - int addr1; /* Address of top of loop */ - int tnum; /* Root page of index */ - Vdbe *v; /* Generate code into this virtual machine */ - KeyInfo *pKey; /* KeyInfo for index */ - int iDb = sqlite3SchemaToIndex(pParse->db, pIndex->pSchema); - -#ifndef SQLITE_OMIT_AUTHORIZATION - if( sqlite3AuthCheck(pParse, SQLITE_REINDEX, pIndex->zName, 0, - pParse->db->aDb[iDb].zName ) ){ - return; - } -#endif - - /* Require a write-lock on the table to perform this operation */ - sqlite3TableLock(pParse, iDb, pTab->tnum, 1, pTab->zName); - - v = sqlite3GetVdbe(pParse); - if( v==0 ) return; - if( memRootPage>=0 ){ - sqlite3VdbeAddOp(v, OP_MemLoad, memRootPage, 0); - tnum = 0; - }else{ - tnum = pIndex->tnum; - sqlite3VdbeAddOp(v, OP_Clear, tnum, iDb); - } - sqlite3VdbeAddOp(v, OP_Integer, iDb, 0); - pKey = sqlite3IndexKeyinfo(pParse, pIndex); - sqlite3VdbeOp3(v, OP_OpenWrite, iIdx, tnum, (char *)pKey, P3_KEYINFO_HANDOFF); - sqlite3OpenTable(pParse, iTab, iDb, pTab, OP_OpenRead); - addr1 = sqlite3VdbeAddOp(v, OP_Rewind, iTab, 0); - sqlite3GenerateIndexKey(v, pIndex, iTab); - if( pIndex->onError!=OE_None ){ - int curaddr = sqlite3VdbeCurrentAddr(v); - int addr2 = curaddr+4; - sqlite3VdbeChangeP2(v, curaddr-1, addr2); - sqlite3VdbeAddOp(v, OP_Rowid, iTab, 0); - sqlite3VdbeAddOp(v, OP_AddImm, 1, 0); - sqlite3VdbeAddOp(v, OP_IsUnique, iIdx, addr2); - sqlite3VdbeOp3(v, OP_Halt, SQLITE_CONSTRAINT, OE_Abort, - "indexed columns are not unique", P3_STATIC); - assert( addr2==sqlite3VdbeCurrentAddr(v) ); - } - sqlite3VdbeAddOp(v, OP_IdxInsert, iIdx, 0); - sqlite3VdbeAddOp(v, OP_Next, iTab, addr1+1); - sqlite3VdbeJumpHere(v, addr1); - sqlite3VdbeAddOp(v, OP_Close, iTab, 0); - sqlite3VdbeAddOp(v, OP_Close, iIdx, 0); -} - -/* -** Create a new index for an SQL table. pName1.pName2 is the name of the index -** and pTblList is the name of the table that is to be indexed. Both will -** be NULL for a primary key or an index that is created to satisfy a -** UNIQUE constraint. If pTable and pIndex are NULL, use pParse->pNewTable -** as the table to be indexed. pParse->pNewTable is a table that is -** currently being constructed by a CREATE TABLE statement. -** -** pList is a list of columns to be indexed. pList will be NULL if this -** is a primary key or unique-constraint on the most recent column added -** to the table currently under construction. -*/ -void sqlite3CreateIndex( - Parse *pParse, /* All information about this parse */ - Token *pName1, /* First part of index name. May be NULL */ - Token *pName2, /* Second part of index name. May be NULL */ - SrcList *pTblName, /* Table to index. Use pParse->pNewTable if 0 */ - ExprList *pList, /* A list of columns to be indexed */ - int onError, /* OE_Abort, OE_Ignore, OE_Replace, or OE_None */ - Token *pStart, /* The CREATE token that begins a CREATE TABLE statement */ - Token *pEnd, /* The ")" that closes the CREATE INDEX statement */ - int sortOrder, /* Sort order of primary key when pList==NULL */ - int ifNotExist /* Omit error if index already exists */ -){ - Table *pTab = 0; /* Table to be indexed */ - Index *pIndex = 0; /* The index to be created */ - char *zName = 0; /* Name of the index */ - int nName; /* Number of characters in zName */ - int i, j; - Token nullId; /* Fake token for an empty ID list */ - DbFixer sFix; /* For assigning database names to pTable */ - int sortOrderMask; /* 1 to honor DESC in index. 0 to ignore. */ - sqlite3 *db = pParse->db; - Db *pDb; /* The specific table containing the indexed database */ - int iDb; /* Index of the database that is being written */ - Token *pName = 0; /* Unqualified name of the index to create */ - struct ExprList_item *pListItem; /* For looping over pList */ - int nCol; - int nExtra = 0; - char *zExtra; - - if( pParse->nErr || sqlite3MallocFailed() || IN_DECLARE_VTAB ){ - goto exit_create_index; - } - - /* - ** Find the table that is to be indexed. Return early if not found. - */ - if( pTblName!=0 ){ - - /* Use the two-part index name to determine the database - ** to search for the table. 'Fix' the table name to this db - ** before looking up the table. - */ - assert( pName1 && pName2 ); - iDb = sqlite3TwoPartName(pParse, pName1, pName2, &pName); - if( iDb<0 ) goto exit_create_index; - -#ifndef SQLITE_OMIT_TEMPDB - /* If the index name was unqualified, check if the the table - ** is a temp table. If so, set the database to 1. - */ - pTab = sqlite3SrcListLookup(pParse, pTblName); - if( pName2 && pName2->n==0 && pTab && pTab->pSchema==db->aDb[1].pSchema ){ - iDb = 1; - } -#endif - - if( sqlite3FixInit(&sFix, pParse, iDb, "index", pName) && - sqlite3FixSrcList(&sFix, pTblName) - ){ - /* Because the parser constructs pTblName from a single identifier, - ** sqlite3FixSrcList can never fail. */ - assert(0); - } - pTab = sqlite3LocateTable(pParse, pTblName->a[0].zName, - pTblName->a[0].zDatabase); - if( !pTab ) goto exit_create_index; - assert( db->aDb[iDb].pSchema==pTab->pSchema ); - }else{ - assert( pName==0 ); - pTab = pParse->pNewTable; - if( !pTab ) goto exit_create_index; - iDb = sqlite3SchemaToIndex(db, pTab->pSchema); - } - pDb = &db->aDb[iDb]; - - if( pTab==0 || pParse->nErr ) goto exit_create_index; - if( pTab->readOnly ){ - sqlite3ErrorMsg(pParse, "table %s may not be indexed", pTab->zName); - goto exit_create_index; - } -#ifndef SQLITE_OMIT_VIEW - if( pTab->pSelect ){ - sqlite3ErrorMsg(pParse, "views may not be indexed"); - goto exit_create_index; - } -#endif -#ifndef SQLITE_OMIT_VIRTUALTABLE - if( IsVirtual(pTab) ){ - sqlite3ErrorMsg(pParse, "virtual tables may not be indexed"); - goto exit_create_index; - } -#endif - - /* - ** Find the name of the index. Make sure there is not already another - ** index or table with the same name. - ** - ** Exception: If we are reading the names of permanent indices from the - ** sqlite_master table (because some other process changed the schema) and - ** one of the index names collides with the name of a temporary table or - ** index, then we will continue to process this index. - ** - ** If pName==0 it means that we are - ** dealing with a primary key or UNIQUE constraint. We have to invent our - ** own name. - */ - if( pName ){ - zName = sqlite3NameFromToken(pName); - if( SQLITE_OK!=sqlite3ReadSchema(pParse) ) goto exit_create_index; - if( zName==0 ) goto exit_create_index; - if( SQLITE_OK!=sqlite3CheckObjectName(pParse, zName) ){ - goto exit_create_index; - } - if( !db->init.busy ){ - if( SQLITE_OK!=sqlite3ReadSchema(pParse) ) goto exit_create_index; - if( sqlite3FindIndex(db, zName, pDb->zName)!=0 ){ - if( !ifNotExist ){ - sqlite3ErrorMsg(pParse, "index %s already exists", zName); - } - goto exit_create_index; - } - if( sqlite3FindTable(db, zName, 0)!=0 ){ - sqlite3ErrorMsg(pParse, "there is already a table named %s", zName); - goto exit_create_index; - } - } - }else{ - char zBuf[30]; - int n; - Index *pLoop; - for(pLoop=pTab->pIndex, n=1; pLoop; pLoop=pLoop->pNext, n++){} - sprintf(zBuf,"_%d",n); - zName = 0; - sqlite3SetString(&zName, "sqlite_autoindex_", pTab->zName, zBuf, (char*)0); - if( zName==0 ) goto exit_create_index; - } - - /* Check for authorization to create an index. - */ -#ifndef SQLITE_OMIT_AUTHORIZATION - { - const char *zDb = pDb->zName; - if( sqlite3AuthCheck(pParse, SQLITE_INSERT, SCHEMA_TABLE(iDb), 0, zDb) ){ - goto exit_create_index; - } - i = SQLITE_CREATE_INDEX; - if( !OMIT_TEMPDB && iDb==1 ) i = SQLITE_CREATE_TEMP_INDEX; - if( sqlite3AuthCheck(pParse, i, zName, pTab->zName, zDb) ){ - goto exit_create_index; - } - } -#endif - - /* If pList==0, it means this routine was called to make a primary - ** key out of the last column added to the table under construction. - ** So create a fake list to simulate this. - */ - if( pList==0 ){ - nullId.z = (u8*)pTab->aCol[pTab->nCol-1].zName; - nullId.n = strlen((char*)nullId.z); - pList = sqlite3ExprListAppend(0, 0, &nullId); - if( pList==0 ) goto exit_create_index; - pList->a[0].sortOrder = sortOrder; - } - - /* Figure out how many bytes of space are required to store explicitly - ** specified collation sequence names. - */ - for(i=0; i<pList->nExpr; i++){ - Expr *pExpr = pList->a[i].pExpr; - if( pExpr ){ - nExtra += (1 + strlen(pExpr->pColl->zName)); - } - } - - /* - ** Allocate the index structure. - */ - nName = strlen(zName); - nCol = pList->nExpr; - pIndex = sqliteMalloc( - sizeof(Index) + /* Index structure */ - sizeof(int)*nCol + /* Index.aiColumn */ - sizeof(int)*(nCol+1) + /* Index.aiRowEst */ - sizeof(char *)*nCol + /* Index.azColl */ - sizeof(u8)*nCol + /* Index.aSortOrder */ - nName + 1 + /* Index.zName */ - nExtra /* Collation sequence names */ - ); - if( sqlite3MallocFailed() ) goto exit_create_index; - pIndex->azColl = (char**)(&pIndex[1]); - pIndex->aiColumn = (int *)(&pIndex->azColl[nCol]); - pIndex->aiRowEst = (unsigned *)(&pIndex->aiColumn[nCol]); - pIndex->aSortOrder = (u8 *)(&pIndex->aiRowEst[nCol+1]); - pIndex->zName = (char *)(&pIndex->aSortOrder[nCol]); - zExtra = (char *)(&pIndex->zName[nName+1]); - strcpy(pIndex->zName, zName); - pIndex->pTable = pTab; - pIndex->nColumn = pList->nExpr; - pIndex->onError = onError; - pIndex->autoIndex = pName==0; - pIndex->pSchema = db->aDb[iDb].pSchema; - - /* Check to see if we should honor DESC requests on index columns - */ - if( pDb->pSchema->file_format>=4 ){ - sortOrderMask = -1; /* Honor DESC */ - }else{ - sortOrderMask = 0; /* Ignore DESC */ - } - - /* Scan the names of the columns of the table to be indexed and - ** load the column indices into the Index structure. Report an error - ** if any column is not found. - */ - for(i=0, pListItem=pList->a; i<pList->nExpr; i++, pListItem++){ - const char *zColName = pListItem->zName; - Column *pTabCol; - int requestedSortOrder; - char *zColl; /* Collation sequence */ - - for(j=0, pTabCol=pTab->aCol; j<pTab->nCol; j++, pTabCol++){ - if( sqlite3StrICmp(zColName, pTabCol->zName)==0 ) break; - } - if( j>=pTab->nCol ){ - sqlite3ErrorMsg(pParse, "table %s has no column named %s", - pTab->zName, zColName); - goto exit_create_index; - } - pIndex->aiColumn[i] = j; - if( pListItem->pExpr ){ - assert( pListItem->pExpr->pColl ); - zColl = zExtra; - strcpy(zExtra, pListItem->pExpr->pColl->zName); - zExtra += (strlen(zColl) + 1); - }else{ - zColl = pTab->aCol[j].zColl; - if( !zColl ){ - zColl = db->pDfltColl->zName; - } - } - if( !db->init.busy && !sqlite3LocateCollSeq(pParse, zColl, -1) ){ - goto exit_create_index; - } - pIndex->azColl[i] = zColl; - requestedSortOrder = pListItem->sortOrder & sortOrderMask; - pIndex->aSortOrder[i] = requestedSortOrder; - } - sqlite3DefaultRowEst(pIndex); - - if( pTab==pParse->pNewTable ){ - /* This routine has been called to create an automatic index as a - ** result of a PRIMARY KEY or UNIQUE clause on a column definition, or - ** a PRIMARY KEY or UNIQUE clause following the column definitions. - ** i.e. one of: - ** - ** CREATE TABLE t(x PRIMARY KEY, y); - ** CREATE TABLE t(x, y, UNIQUE(x, y)); - ** - ** Either way, check to see if the table already has such an index. If - ** so, don't bother creating this one. This only applies to - ** automatically created indices. Users can do as they wish with - ** explicit indices. - */ - Index *pIdx; - for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){ - int k; - assert( pIdx->onError!=OE_None ); - assert( pIdx->autoIndex ); - assert( pIndex->onError!=OE_None ); - - if( pIdx->nColumn!=pIndex->nColumn ) continue; - for(k=0; k<pIdx->nColumn; k++){ - const char *z1 = pIdx->azColl[k]; - const char *z2 = pIndex->azColl[k]; - if( pIdx->aiColumn[k]!=pIndex->aiColumn[k] ) break; - if( pIdx->aSortOrder[k]!=pIndex->aSortOrder[k] ) break; - if( z1!=z2 && sqlite3StrICmp(z1, z2) ) break; - } - if( k==pIdx->nColumn ){ - if( pIdx->onError!=pIndex->onError ){ - /* This constraint creates the same index as a previous - ** constraint specified somewhere in the CREATE TABLE statement. - ** However the ON CONFLICT clauses are different. If both this - ** constraint and the previous equivalent constraint have explicit - ** ON CONFLICT clauses this is an error. Otherwise, use the - ** explicitly specified behaviour for the index. - */ - if( !(pIdx->onError==OE_Default || pIndex->onError==OE_Default) ){ - sqlite3ErrorMsg(pParse, - "conflicting ON CONFLICT clauses specified", 0); - } - if( pIdx->onError==OE_Default ){ - pIdx->onError = pIndex->onError; - } - } - goto exit_create_index; - } - } - } - - /* Link the new Index structure to its table and to the other - ** in-memory database structures. - */ - if( db->init.busy ){ - Index *p; - p = sqlite3HashInsert(&pIndex->pSchema->idxHash, - pIndex->zName, strlen(pIndex->zName)+1, pIndex); - if( p ){ - assert( p==pIndex ); /* Malloc must have failed */ - goto exit_create_index; - } - db->flags |= SQLITE_InternChanges; - if( pTblName!=0 ){ - pIndex->tnum = db->init.newTnum; - } - } - - /* If the db->init.busy is 0 then create the index on disk. This - ** involves writing the index into the master table and filling in the - ** index with the current table contents. - ** - ** The db->init.busy is 0 when the user first enters a CREATE INDEX - ** command. db->init.busy is 1 when a database is opened and - ** CREATE INDEX statements are read out of the master table. In - ** the latter case the index already exists on disk, which is why - ** we don't want to recreate it. - ** - ** If pTblName==0 it means this index is generated as a primary key - ** or UNIQUE constraint of a CREATE TABLE statement. Since the table - ** has just been created, it contains no data and the index initialization - ** step can be skipped. - */ - else if( db->init.busy==0 ){ - Vdbe *v; - char *zStmt; - int iMem = pParse->nMem++; - - v = sqlite3GetVdbe(pParse); - if( v==0 ) goto exit_create_index; - - - /* Create the rootpage for the index - */ - sqlite3BeginWriteOperation(pParse, 1, iDb); - sqlite3VdbeAddOp(v, OP_CreateIndex, iDb, 0); - sqlite3VdbeAddOp(v, OP_MemStore, iMem, 0); - - /* Gather the complete text of the CREATE INDEX statement into - ** the zStmt variable - */ - if( pStart && pEnd ){ - /* A named index with an explicit CREATE INDEX statement */ - zStmt = sqlite3MPrintf("CREATE%s INDEX %.*s", - onError==OE_None ? "" : " UNIQUE", - pEnd->z - pName->z + 1, - pName->z); - }else{ - /* An automatic index created by a PRIMARY KEY or UNIQUE constraint */ - /* zStmt = sqlite3MPrintf(""); */ - zStmt = 0; - } - - /* Add an entry in sqlite_master for this index - */ - sqlite3NestedParse(pParse, - "INSERT INTO %Q.%s VALUES('index',%Q,%Q,#0,%Q);", - db->aDb[iDb].zName, SCHEMA_TABLE(iDb), - pIndex->zName, - pTab->zName, - zStmt - ); - sqlite3VdbeAddOp(v, OP_Pop, 1, 0); - sqliteFree(zStmt); - - /* Fill the index with data and reparse the schema. Code an OP_Expire - ** to invalidate all pre-compiled statements. - */ - if( pTblName ){ - sqlite3RefillIndex(pParse, pIndex, iMem); - sqlite3ChangeCookie(db, v, iDb); - sqlite3VdbeOp3(v, OP_ParseSchema, iDb, 0, - sqlite3MPrintf("name='%q'", pIndex->zName), P3_DYNAMIC); - sqlite3VdbeAddOp(v, OP_Expire, 0, 0); - } - } - - /* When adding an index to the list of indices for a table, make - ** sure all indices labeled OE_Replace come after all those labeled - ** OE_Ignore. This is necessary for the correct operation of UPDATE - ** and INSERT. - */ - if( db->init.busy || pTblName==0 ){ - if( onError!=OE_Replace || pTab->pIndex==0 - || pTab->pIndex->onError==OE_Replace){ - pIndex->pNext = pTab->pIndex; - pTab->pIndex = pIndex; - }else{ - Index *pOther = pTab->pIndex; - while( pOther->pNext && pOther->pNext->onError!=OE_Replace ){ - pOther = pOther->pNext; - } - pIndex->pNext = pOther->pNext; - pOther->pNext = pIndex; - } - pIndex = 0; - } - - /* Clean up before exiting */ -exit_create_index: - if( pIndex ){ - freeIndex(pIndex); - } - sqlite3ExprListDelete(pList); - sqlite3SrcListDelete(pTblName); - sqliteFree(zName); - return; -} - -/* -** Generate code to make sure the file format number is at least minFormat. -** The generated code will increase the file format number if necessary. -*/ -void sqlite3MinimumFileFormat(Parse *pParse, int iDb, int minFormat){ - Vdbe *v; - v = sqlite3GetVdbe(pParse); - if( v ){ - sqlite3VdbeAddOp(v, OP_ReadCookie, iDb, 1); - sqlite3VdbeAddOp(v, OP_Integer, minFormat, 0); - sqlite3VdbeAddOp(v, OP_Ge, 0, sqlite3VdbeCurrentAddr(v)+3); - sqlite3VdbeAddOp(v, OP_Integer, minFormat, 0); - sqlite3VdbeAddOp(v, OP_SetCookie, iDb, 1); - } -} - -/* -** Fill the Index.aiRowEst[] array with default information - information -** to be used when we have not run the ANALYZE command. -** -** aiRowEst[0] is suppose to contain the number of elements in the index. -** Since we do not know, guess 1 million. aiRowEst[1] is an estimate of the -** number of rows in the table that match any particular value of the -** first column of the index. aiRowEst[2] is an estimate of the number -** of rows that match any particular combiniation of the first 2 columns -** of the index. And so forth. It must always be the case that -* -** aiRowEst[N]<=aiRowEst[N-1] -** aiRowEst[N]>=1 -** -** Apart from that, we have little to go on besides intuition as to -** how aiRowEst[] should be initialized. The numbers generated here -** are based on typical values found in actual indices. -*/ -void sqlite3DefaultRowEst(Index *pIdx){ - unsigned *a = pIdx->aiRowEst; - int i; - assert( a!=0 ); - a[0] = 1000000; - for(i=pIdx->nColumn; i>=5; i--){ - a[i] = 5; - } - while( i>=1 ){ - a[i] = 11 - i; - i--; - } - if( pIdx->onError!=OE_None ){ - a[pIdx->nColumn] = 1; - } -} - -/* -** This routine will drop an existing named index. This routine -** implements the DROP INDEX statement. -*/ -void sqlite3DropIndex(Parse *pParse, SrcList *pName, int ifExists){ - Index *pIndex; - Vdbe *v; - sqlite3 *db = pParse->db; - int iDb; - - if( pParse->nErr || sqlite3MallocFailed() ){ - goto exit_drop_index; - } - assert( pName->nSrc==1 ); - if( SQLITE_OK!=sqlite3ReadSchema(pParse) ){ - goto exit_drop_index; - } - pIndex = sqlite3FindIndex(db, pName->a[0].zName, pName->a[0].zDatabase); - if( pIndex==0 ){ - if( !ifExists ){ - sqlite3ErrorMsg(pParse, "no such index: %S", pName, 0); - } - pParse->checkSchema = 1; - goto exit_drop_index; - } - if( pIndex->autoIndex ){ - sqlite3ErrorMsg(pParse, "index associated with UNIQUE " - "or PRIMARY KEY constraint cannot be dropped", 0); - goto exit_drop_index; - } - iDb = sqlite3SchemaToIndex(db, pIndex->pSchema); -#ifndef SQLITE_OMIT_AUTHORIZATION - { - int code = SQLITE_DROP_INDEX; - Table *pTab = pIndex->pTable; - const char *zDb = db->aDb[iDb].zName; - const char *zTab = SCHEMA_TABLE(iDb); - if( sqlite3AuthCheck(pParse, SQLITE_DELETE, zTab, 0, zDb) ){ - goto exit_drop_index; - } - if( !OMIT_TEMPDB && iDb ) code = SQLITE_DROP_TEMP_INDEX; - if( sqlite3AuthCheck(pParse, code, pIndex->zName, pTab->zName, zDb) ){ - goto exit_drop_index; - } - } -#endif - - /* Generate code to remove the index and from the master table */ - v = sqlite3GetVdbe(pParse); - if( v ){ - sqlite3NestedParse(pParse, - "DELETE FROM %Q.%s WHERE name=%Q", - db->aDb[iDb].zName, SCHEMA_TABLE(iDb), - pIndex->zName - ); - sqlite3ChangeCookie(db, v, iDb); - destroyRootPage(pParse, pIndex->tnum, iDb); - sqlite3VdbeOp3(v, OP_DropIndex, iDb, 0, pIndex->zName, 0); - } - -exit_drop_index: - sqlite3SrcListDelete(pName); -} - -/* -** ppArray points into a structure where there is an array pointer -** followed by two integers. The first integer is the -** number of elements in the structure array. The second integer -** is the number of allocated slots in the array. -** -** In other words, the structure looks something like this: -** -** struct Example1 { -** struct subElem *aEntry; -** int nEntry; -** int nAlloc; -** } -** -** The pnEntry parameter points to the equivalent of Example1.nEntry. -** -** This routine allocates a new slot in the array, zeros it out, -** and returns its index. If malloc fails a negative number is returned. -** -** szEntry is the sizeof of a single array entry. initSize is the -** number of array entries allocated on the initial allocation. -*/ -int sqlite3ArrayAllocate(void **ppArray, int szEntry, int initSize){ - char *p; - int *an = (int*)&ppArray[1]; - if( an[0]>=an[1] ){ - void *pNew; - int newSize; - newSize = an[1]*2 + initSize; - pNew = sqliteRealloc(*ppArray, newSize*szEntry); - if( pNew==0 ){ - return -1; - } - an[1] = newSize; - *ppArray = pNew; - } - p = *ppArray; - memset(&p[an[0]*szEntry], 0, szEntry); - return an[0]++; -} - -/* -** Append a new element to the given IdList. Create a new IdList if -** need be. -** -** A new IdList is returned, or NULL if malloc() fails. -*/ -IdList *sqlite3IdListAppend(IdList *pList, Token *pToken){ - int i; - if( pList==0 ){ - pList = sqliteMalloc( sizeof(IdList) ); - if( pList==0 ) return 0; - pList->nAlloc = 0; - } - i = sqlite3ArrayAllocate((void**)&pList->a, sizeof(pList->a[0]), 5); - if( i<0 ){ - sqlite3IdListDelete(pList); - return 0; - } - pList->a[i].zName = sqlite3NameFromToken(pToken); - return pList; -} - -/* -** Delete an IdList. -*/ -void sqlite3IdListDelete(IdList *pList){ - int i; - if( pList==0 ) return; - for(i=0; i<pList->nId; i++){ - sqliteFree(pList->a[i].zName); - } - sqliteFree(pList->a); - sqliteFree(pList); -} - -/* -** Return the index in pList of the identifier named zId. Return -1 -** if not found. -*/ -int sqlite3IdListIndex(IdList *pList, const char *zName){ - int i; - if( pList==0 ) return -1; - for(i=0; i<pList->nId; i++){ - if( sqlite3StrICmp(pList->a[i].zName, zName)==0 ) return i; - } - return -1; -} - -/* -** Append a new table name to the given SrcList. Create a new SrcList if -** need be. A new entry is created in the SrcList even if pToken is NULL. -** -** A new SrcList is returned, or NULL if malloc() fails. -** -** If pDatabase is not null, it means that the table has an optional -** database name prefix. Like this: "database.table". The pDatabase -** points to the table name and the pTable points to the database name. -** The SrcList.a[].zName field is filled with the table name which might -** come from pTable (if pDatabase is NULL) or from pDatabase. -** SrcList.a[].zDatabase is filled with the database name from pTable, -** or with NULL if no database is specified. -** -** In other words, if call like this: -** -** sqlite3SrcListAppend(A,B,0); -** -** Then B is a table name and the database name is unspecified. If called -** like this: -** -** sqlite3SrcListAppend(A,B,C); -** -** Then C is the table name and B is the database name. -*/ -SrcList *sqlite3SrcListAppend(SrcList *pList, Token *pTable, Token *pDatabase){ - struct SrcList_item *pItem; - if( pList==0 ){ - pList = sqliteMalloc( sizeof(SrcList) ); - if( pList==0 ) return 0; - pList->nAlloc = 1; - } - if( pList->nSrc>=pList->nAlloc ){ - SrcList *pNew; - pList->nAlloc *= 2; - pNew = sqliteRealloc(pList, - sizeof(*pList) + (pList->nAlloc-1)*sizeof(pList->a[0]) ); - if( pNew==0 ){ - sqlite3SrcListDelete(pList); - return 0; - } - pList = pNew; - } - pItem = &pList->a[pList->nSrc]; - memset(pItem, 0, sizeof(pList->a[0])); - if( pDatabase && pDatabase->z==0 ){ - pDatabase = 0; - } - if( pDatabase && pTable ){ - Token *pTemp = pDatabase; - pDatabase = pTable; - pTable = pTemp; - } - pItem->zName = sqlite3NameFromToken(pTable); - pItem->zDatabase = sqlite3NameFromToken(pDatabase); - pItem->iCursor = -1; - pItem->isPopulated = 0; - pList->nSrc++; - return pList; -} - -/* -** Assign cursors to all tables in a SrcList -*/ -void sqlite3SrcListAssignCursors(Parse *pParse, SrcList *pList){ - int i; - struct SrcList_item *pItem; - assert(pList || sqlite3MallocFailed() ); - if( pList ){ - for(i=0, pItem=pList->a; i<pList->nSrc; i++, pItem++){ - if( pItem->iCursor>=0 ) break; - pItem->iCursor = pParse->nTab++; - if( pItem->pSelect ){ - sqlite3SrcListAssignCursors(pParse, pItem->pSelect->pSrc); - } - } - } -} - -/* -** Add an alias to the last identifier on the given identifier list. -*/ -void sqlite3SrcListAddAlias(SrcList *pList, Token *pToken){ - if( pList && pList->nSrc>0 ){ - pList->a[pList->nSrc-1].zAlias = sqlite3NameFromToken(pToken); - } -} - -/* -** Delete an entire SrcList including all its substructure. -*/ -void sqlite3SrcListDelete(SrcList *pList){ - int i; - struct SrcList_item *pItem; - if( pList==0 ) return; - for(pItem=pList->a, i=0; i<pList->nSrc; i++, pItem++){ - sqliteFree(pItem->zDatabase); - sqliteFree(pItem->zName); - sqliteFree(pItem->zAlias); - sqlite3DeleteTable(0, pItem->pTab); - sqlite3SelectDelete(pItem->pSelect); - sqlite3ExprDelete(pItem->pOn); - sqlite3IdListDelete(pItem->pUsing); - } - sqliteFree(pList); -} - -/* -** Begin a transaction -*/ -void sqlite3BeginTransaction(Parse *pParse, int type){ - sqlite3 *db; - Vdbe *v; - int i; - - if( pParse==0 || (db=pParse->db)==0 || db->aDb[0].pBt==0 ) return; - if( pParse->nErr || sqlite3MallocFailed() ) return; - if( sqlite3AuthCheck(pParse, SQLITE_TRANSACTION, "BEGIN", 0, 0) ) return; - - v = sqlite3GetVdbe(pParse); - if( !v ) return; - if( type!=TK_DEFERRED ){ - for(i=0; i<db->nDb; i++){ - sqlite3VdbeAddOp(v, OP_Transaction, i, (type==TK_EXCLUSIVE)+1); - } - } - sqlite3VdbeAddOp(v, OP_AutoCommit, 0, 0); -} - -/* -** Commit a transaction -*/ -void sqlite3CommitTransaction(Parse *pParse){ - sqlite3 *db; - Vdbe *v; - - if( pParse==0 || (db=pParse->db)==0 || db->aDb[0].pBt==0 ) return; - if( pParse->nErr || sqlite3MallocFailed() ) return; - if( sqlite3AuthCheck(pParse, SQLITE_TRANSACTION, "COMMIT", 0, 0) ) return; - - v = sqlite3GetVdbe(pParse); - if( v ){ - sqlite3VdbeAddOp(v, OP_AutoCommit, 1, 0); - } -} - -/* -** Rollback a transaction -*/ -void sqlite3RollbackTransaction(Parse *pParse){ - sqlite3 *db; - Vdbe *v; - - if( pParse==0 || (db=pParse->db)==0 || db->aDb[0].pBt==0 ) return; - if( pParse->nErr || sqlite3MallocFailed() ) return; - if( sqlite3AuthCheck(pParse, SQLITE_TRANSACTION, "ROLLBACK", 0, 0) ) return; - - v = sqlite3GetVdbe(pParse); - if( v ){ - sqlite3VdbeAddOp(v, OP_AutoCommit, 1, 1); - } -} - -/* -** Make sure the TEMP database is open and available for use. Return -** the number of errors. Leave any error messages in the pParse structure. -*/ -int sqlite3OpenTempDatabase(Parse *pParse){ - sqlite3 *db = pParse->db; - if( db->aDb[1].pBt==0 && !pParse->explain ){ - int rc = sqlite3BtreeFactory(db, 0, 0, MAX_PAGES, &db->aDb[1].pBt); - if( rc!=SQLITE_OK ){ - sqlite3ErrorMsg(pParse, "unable to open a temporary database " - "file for storing temporary tables"); - pParse->rc = rc; - return 1; - } - if( db->flags & !db->autoCommit ){ - rc = sqlite3BtreeBeginTrans(db->aDb[1].pBt, 1); - if( rc!=SQLITE_OK ){ - sqlite3ErrorMsg(pParse, "unable to get a write lock on " - "the temporary database file"); - pParse->rc = rc; - return 1; - } - } - assert( db->aDb[1].pSchema ); - } - return 0; -} - -/* -** Generate VDBE code that will verify the schema cookie and start -** a read-transaction for all named database files. -** -** It is important that all schema cookies be verified and all -** read transactions be started before anything else happens in -** the VDBE program. But this routine can be called after much other -** code has been generated. So here is what we do: -** -** The first time this routine is called, we code an OP_Goto that -** will jump to a subroutine at the end of the program. Then we -** record every database that needs its schema verified in the -** pParse->cookieMask field. Later, after all other code has been -** generated, the subroutine that does the cookie verifications and -** starts the transactions will be coded and the OP_Goto P2 value -** will be made to point to that subroutine. The generation of the -** cookie verification subroutine code happens in sqlite3FinishCoding(). -** -** If iDb<0 then code the OP_Goto only - don't set flag to verify the -** schema on any databases. This can be used to position the OP_Goto -** early in the code, before we know if any database tables will be used. -*/ -void sqlite3CodeVerifySchema(Parse *pParse, int iDb){ - sqlite3 *db; - Vdbe *v; - int mask; - - v = sqlite3GetVdbe(pParse); - if( v==0 ) return; /* This only happens if there was a prior error */ - db = pParse->db; - if( pParse->cookieGoto==0 ){ - pParse->cookieGoto = sqlite3VdbeAddOp(v, OP_Goto, 0, 0)+1; - } - if( iDb>=0 ){ - assert( iDb<db->nDb ); - assert( db->aDb[iDb].pBt!=0 || iDb==1 ); - assert( iDb<MAX_ATTACHED+2 ); - mask = 1<<iDb; - if( (pParse->cookieMask & mask)==0 ){ - pParse->cookieMask |= mask; - pParse->cookieValue[iDb] = db->aDb[iDb].pSchema->schema_cookie; - if( !OMIT_TEMPDB && iDb==1 ){ - sqlite3OpenTempDatabase(pParse); - } - } - } -} - -/* -** Generate VDBE code that prepares for doing an operation that -** might change the database. -** -** This routine starts a new transaction if we are not already within -** a transaction. If we are already within a transaction, then a checkpoint -** is set if the setStatement parameter is true. A checkpoint should -** be set for operations that might fail (due to a constraint) part of -** the way through and which will need to undo some writes without having to -** rollback the whole transaction. For operations where all constraints -** can be checked before any changes are made to the database, it is never -** necessary to undo a write and the checkpoint should not be set. -** -** Only database iDb and the temp database are made writable by this call. -** If iDb==0, then the main and temp databases are made writable. If -** iDb==1 then only the temp database is made writable. If iDb>1 then the -** specified auxiliary database and the temp database are made writable. -*/ -void sqlite3BeginWriteOperation(Parse *pParse, int setStatement, int iDb){ - Vdbe *v = sqlite3GetVdbe(pParse); - if( v==0 ) return; - sqlite3CodeVerifySchema(pParse, iDb); - pParse->writeMask |= 1<<iDb; - if( setStatement && pParse->nested==0 ){ - sqlite3VdbeAddOp(v, OP_Statement, iDb, 0); - } - if( (OMIT_TEMPDB || iDb!=1) && pParse->db->aDb[1].pBt!=0 ){ - sqlite3BeginWriteOperation(pParse, setStatement, 1); - } -} - -/* -** Check to see if pIndex uses the collating sequence pColl. Return -** true if it does and false if it does not. -*/ -#ifndef SQLITE_OMIT_REINDEX -static int collationMatch(const char *zColl, Index *pIndex){ - int i; - for(i=0; i<pIndex->nColumn; i++){ - const char *z = pIndex->azColl[i]; - if( z==zColl || (z && zColl && 0==sqlite3StrICmp(z, zColl)) ){ - return 1; - } - } - return 0; -} -#endif - -/* -** Recompute all indices of pTab that use the collating sequence pColl. -** If pColl==0 then recompute all indices of pTab. -*/ -#ifndef SQLITE_OMIT_REINDEX -static void reindexTable(Parse *pParse, Table *pTab, char const *zColl){ - Index *pIndex; /* An index associated with pTab */ - - for(pIndex=pTab->pIndex; pIndex; pIndex=pIndex->pNext){ - if( zColl==0 || collationMatch(zColl, pIndex) ){ - int iDb = sqlite3SchemaToIndex(pParse->db, pTab->pSchema); - sqlite3BeginWriteOperation(pParse, 0, iDb); - sqlite3RefillIndex(pParse, pIndex, -1); - } - } -} -#endif - -/* -** Recompute all indices of all tables in all databases where the -** indices use the collating sequence pColl. If pColl==0 then recompute -** all indices everywhere. -*/ -#ifndef SQLITE_OMIT_REINDEX -static void reindexDatabases(Parse *pParse, char const *zColl){ - Db *pDb; /* A single database */ - int iDb; /* The database index number */ - sqlite3 *db = pParse->db; /* The database connection */ - HashElem *k; /* For looping over tables in pDb */ - Table *pTab; /* A table in the database */ - - for(iDb=0, pDb=db->aDb; iDb<db->nDb; iDb++, pDb++){ - assert( pDb!=0 ); - for(k=sqliteHashFirst(&pDb->pSchema->tblHash); k; k=sqliteHashNext(k)){ - pTab = (Table*)sqliteHashData(k); - reindexTable(pParse, pTab, zColl); - } - } -} -#endif - -/* -** Generate code for the REINDEX command. -** -** REINDEX -- 1 -** REINDEX <collation> -- 2 -** REINDEX ?<database>.?<tablename> -- 3 -** REINDEX ?<database>.?<indexname> -- 4 -** -** Form 1 causes all indices in all attached databases to be rebuilt. -** Form 2 rebuilds all indices in all databases that use the named -** collating function. Forms 3 and 4 rebuild the named index or all -** indices associated with the named table. -*/ -#ifndef SQLITE_OMIT_REINDEX -void sqlite3Reindex(Parse *pParse, Token *pName1, Token *pName2){ - CollSeq *pColl; /* Collating sequence to be reindexed, or NULL */ - char *z; /* Name of a table or index */ - const char *zDb; /* Name of the database */ - Table *pTab; /* A table in the database */ - Index *pIndex; /* An index associated with pTab */ - int iDb; /* The database index number */ - sqlite3 *db = pParse->db; /* The database connection */ - Token *pObjName; /* Name of the table or index to be reindexed */ - - /* Read the database schema. If an error occurs, leave an error message - ** and code in pParse and return NULL. */ - if( SQLITE_OK!=sqlite3ReadSchema(pParse) ){ - return; - } - - if( pName1==0 || pName1->z==0 ){ - reindexDatabases(pParse, 0); - return; - }else if( pName2==0 || pName2->z==0 ){ - assert( pName1->z ); - pColl = sqlite3FindCollSeq(db, ENC(db), (char*)pName1->z, pName1->n, 0); - if( pColl ){ - char *zColl = sqliteStrNDup((const char *)pName1->z, pName1->n); - if( zColl ){ - reindexDatabases(pParse, zColl); - sqliteFree(zColl); - } - return; - } - } - iDb = sqlite3TwoPartName(pParse, pName1, pName2, &pObjName); - if( iDb<0 ) return; - z = sqlite3NameFromToken(pObjName); - zDb = db->aDb[iDb].zName; - pTab = sqlite3FindTable(db, z, zDb); - if( pTab ){ - reindexTable(pParse, pTab, 0); - sqliteFree(z); - return; - } - pIndex = sqlite3FindIndex(db, z, zDb); - sqliteFree(z); - if( pIndex ){ - sqlite3BeginWriteOperation(pParse, 0, iDb); - sqlite3RefillIndex(pParse, pIndex, -1); - return; - } - sqlite3ErrorMsg(pParse, "unable to identify the object to be reindexed"); -} -#endif - -/* -** Return a dynamicly allocated KeyInfo structure that can be used -** with OP_OpenRead or OP_OpenWrite to access database index pIdx. -** -** If successful, a pointer to the new structure is returned. In this case -** the caller is responsible for calling sqliteFree() on the returned -** pointer. If an error occurs (out of memory or missing collation -** sequence), NULL is returned and the state of pParse updated to reflect -** the error. -*/ -KeyInfo *sqlite3IndexKeyinfo(Parse *pParse, Index *pIdx){ - int i; - int nCol = pIdx->nColumn; - int nBytes = sizeof(KeyInfo) + (nCol-1)*sizeof(CollSeq*) + nCol; - KeyInfo *pKey = (KeyInfo *)sqliteMalloc(nBytes); - - if( pKey ){ - pKey->aSortOrder = (u8 *)&(pKey->aColl[nCol]); - assert( &pKey->aSortOrder[nCol]==&(((u8 *)pKey)[nBytes]) ); - for(i=0; i<nCol; i++){ - char *zColl = pIdx->azColl[i]; - assert( zColl ); - pKey->aColl[i] = sqlite3LocateCollSeq(pParse, zColl, -1); - pKey->aSortOrder[i] = pIdx->aSortOrder[i]; - } - pKey->nField = nCol; - } - - if( pParse->nErr ){ - sqliteFree(pKey); - pKey = 0; - } - return pKey; -} |