/***************************************************************************** Copyright (c) 1996, 2016, Oracle and/or its affiliates. All Rights Reserved. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA *****************************************************************************/ /**************************************************//** @file include/row0upd.h Update of a row Created 12/27/1996 Heikki Tuuri *******************************************************/ #ifndef row0upd_h #define row0upd_h #include "univ.i" #include "data0data.h" #include "row0types.h" #include "btr0types.h" #include "dict0types.h" #include "trx0types.h" #ifndef UNIV_HOTBACKUP # include "btr0pcur.h" # include "que0types.h" # include "pars0types.h" #endif /* !UNIV_HOTBACKUP */ /*********************************************************************//** Creates an update vector object. @return own: update vector object */ UNIV_INLINE upd_t* upd_create( /*=======*/ ulint n, /*!< in: number of fields */ mem_heap_t* heap); /*!< in: heap from which memory allocated */ /*********************************************************************//** Returns the number of fields in the update vector == number of columns to be updated by an update vector. @return number of fields */ UNIV_INLINE ulint upd_get_n_fields( /*=============*/ const upd_t* update); /*!< in: update vector */ #ifdef UNIV_DEBUG /*********************************************************************//** Returns the nth field of an update vector. @return update vector field */ UNIV_INLINE upd_field_t* upd_get_nth_field( /*==============*/ const upd_t* update, /*!< in: update vector */ ulint n); /*!< in: field position in update vector */ #else # define upd_get_nth_field(update, n) ((update)->fields + (n)) #endif #ifndef UNIV_HOTBACKUP /*********************************************************************//** Sets an index field number to be updated by an update vector field. */ UNIV_INLINE void upd_field_set_field_no( /*===================*/ upd_field_t* upd_field, /*!< in: update vector field */ ulint field_no, /*!< in: field number in a clustered index */ dict_index_t* index, /*!< in: index */ trx_t* trx); /*!< in: transaction */ /*********************************************************************//** Returns a field of an update vector by field_no. @return update vector field, or NULL */ UNIV_INLINE const upd_field_t* upd_get_field_by_field_no( /*======================*/ const upd_t* update, /*!< in: update vector */ ulint no) /*!< in: field_no */ MY_ATTRIBUTE((nonnull, pure)); /*********************************************************************//** Writes into the redo log the values of trx id and roll ptr and enough info to determine their positions within a clustered index record. @return new pointer to mlog */ UNIV_INTERN byte* row_upd_write_sys_vals_to_log( /*==========================*/ dict_index_t* index, /*!< in: clustered index */ trx_id_t trx_id, /*!< in: transaction id */ roll_ptr_t roll_ptr,/*!< in: roll ptr of the undo log record */ byte* log_ptr,/*!< pointer to a buffer of size > 20 opened in mlog */ mtr_t* mtr); /*!< in: mtr */ /*********************************************************************//** Updates the trx id and roll ptr field in a clustered index record when a row is updated or marked deleted. */ UNIV_INLINE void row_upd_rec_sys_fields( /*===================*/ rec_t* rec, /*!< in/out: record */ page_zip_des_t* page_zip,/*!< in/out: compressed page whose uncompressed part will be updated, or NULL */ dict_index_t* index, /*!< in: clustered index */ const ulint* offsets,/*!< in: rec_get_offsets(rec, index) */ const trx_t* trx, /*!< in: transaction */ roll_ptr_t roll_ptr);/*!< in: roll ptr of the undo log record, can be 0 during IMPORT */ /*********************************************************************//** Sets the trx id or roll ptr field of a clustered index entry. */ UNIV_INTERN void row_upd_index_entry_sys_field( /*==========================*/ dtuple_t* entry, /*!< in/out: index entry, where the memory buffers for sys fields are already allocated: the function just copies the new values to them */ dict_index_t* index, /*!< in: clustered index */ ulint type, /*!< in: DATA_TRX_ID or DATA_ROLL_PTR */ ib_uint64_t val); /*!< in: value to write */ /*********************************************************************//** Creates an update node for a query graph. @return own: update node */ UNIV_INTERN upd_node_t* upd_node_create( /*============*/ mem_heap_t* heap); /*!< in: mem heap where created */ /***********************************************************//** Writes to the redo log the new values of the fields occurring in the index. */ UNIV_INTERN void row_upd_index_write_log( /*====================*/ const upd_t* update, /*!< in: update vector */ byte* log_ptr,/*!< in: pointer to mlog buffer: must contain at least MLOG_BUF_MARGIN bytes of free space; the buffer is closed within this function */ mtr_t* mtr); /*!< in: mtr into whose log to write */ /***********************************************************//** Returns TRUE if row update changes size of some field in index or if some field to be updated is stored externally in rec or update. @return TRUE if the update changes the size of some field in index or the field is external in rec or update */ UNIV_INTERN ibool row_upd_changes_field_size_or_external( /*===================================*/ dict_index_t* index, /*!< in: index */ const ulint* offsets,/*!< in: rec_get_offsets(rec, index) */ const upd_t* update);/*!< in: update vector */ /***********************************************************//** Returns true if row update contains disowned external fields. @return true if the update contains disowned external fields. */ UNIV_INTERN bool row_upd_changes_disowned_external( /*==============================*/ const upd_t* update) /*!< in: update vector */ MY_ATTRIBUTE((nonnull, warn_unused_result)); #endif /* !UNIV_HOTBACKUP */ /***********************************************************//** Replaces the new column values stored in the update vector to the record given. No field size changes are allowed. This function is usually invoked on a clustered index. The only use case for a secondary index is row_ins_sec_index_entry_by_modify() or its counterpart in ibuf_insert_to_index_page(). */ UNIV_INTERN void row_upd_rec_in_place( /*=================*/ rec_t* rec, /*!< in/out: record where replaced */ dict_index_t* index, /*!< in: the index the record belongs to */ const ulint* offsets,/*!< in: array returned by rec_get_offsets() */ const upd_t* update, /*!< in: update vector */ page_zip_des_t* page_zip);/*!< in: compressed page with enough space available, or NULL */ #ifndef UNIV_HOTBACKUP /***************************************************************//** Builds an update vector from those fields which in a secondary index entry differ from a record that has the equal ordering fields. NOTE: we compare the fields as binary strings! @return own: update vector of differing fields */ UNIV_INTERN upd_t* row_upd_build_sec_rec_difference_binary( /*====================================*/ const rec_t* rec, /*!< in: secondary index record */ dict_index_t* index, /*!< in: index */ const ulint* offsets,/*!< in: rec_get_offsets(rec, index) */ const dtuple_t* entry, /*!< in: entry to insert */ mem_heap_t* heap) /*!< in: memory heap from which allocated */ MY_ATTRIBUTE((warn_unused_result, nonnull)); /***************************************************************//** Builds an update vector from those fields, excluding the roll ptr and trx id fields, which in an index entry differ from a record that has the equal ordering fields. NOTE: we compare the fields as binary strings! @return own: update vector of differing fields, excluding roll ptr and trx id */ UNIV_INTERN const upd_t* row_upd_build_difference_binary( /*============================*/ dict_index_t* index, /*!< in: clustered index */ const dtuple_t* entry, /*!< in: entry to insert */ const rec_t* rec, /*!< in: clustered index record */ const ulint* offsets,/*!< in: rec_get_offsets(rec,index), or NULL */ bool no_sys, /*!< in: skip the system columns DB_TRX_ID and DB_ROLL_PTR */ trx_t* trx, /*!< in: transaction (for diagnostics), or NULL */ mem_heap_t* heap) /*!< in: memory heap from which allocated */ MY_ATTRIBUTE((nonnull(1,2,3,7), warn_unused_result)); /***********************************************************//** Replaces the new column values stored in the update vector to the index entry given. */ UNIV_INTERN void row_upd_index_replace_new_col_vals_index_pos( /*=========================================*/ dtuple_t* entry, /*!< in/out: index entry where replaced; the clustered index record must be covered by a lock or a page latch to prevent deletion (rollback or purge) */ dict_index_t* index, /*!< in: index; NOTE that this may also be a non-clustered index */ const upd_t* update, /*!< in: an update vector built for the index so that the field number in an upd_field is the index position */ ibool order_only, /*!< in: if TRUE, limit the replacement to ordering fields of index; note that this does not work for non-clustered indexes. */ mem_heap_t* heap) /*!< in: memory heap for allocating and copying the new values */ MY_ATTRIBUTE((nonnull)); /***********************************************************//** Replaces the new column values stored in the update vector to the index entry given. */ UNIV_INTERN void row_upd_index_replace_new_col_vals( /*===============================*/ dtuple_t* entry, /*!< in/out: index entry where replaced; the clustered index record must be covered by a lock or a page latch to prevent deletion (rollback or purge) */ dict_index_t* index, /*!< in: index; NOTE that this may also be a non-clustered index */ const upd_t* update, /*!< in: an update vector built for the CLUSTERED index so that the field number in an upd_field is the clustered index position */ mem_heap_t* heap) /*!< in: memory heap for allocating and copying the new values */ MY_ATTRIBUTE((nonnull)); /***********************************************************//** Replaces the new column values stored in the update vector. */ UNIV_INTERN void row_upd_replace( /*============*/ dtuple_t* row, /*!< in/out: row where replaced, indexed by col_no; the clustered index record must be covered by a lock or a page latch to prevent deletion (rollback or purge) */ row_ext_t** ext, /*!< out, own: NULL, or externally stored column prefixes */ const dict_index_t* index, /*!< in: clustered index */ const upd_t* update, /*!< in: an update vector built for the clustered index */ mem_heap_t* heap); /*!< in: memory heap */ /***********************************************************//** Checks if an update vector changes an ordering field of an index record. This function is fast if the update vector is short or the number of ordering fields in the index is small. Otherwise, this can be quadratic. NOTE: we compare the fields as binary strings! @return TRUE if update vector changes an ordering field in the index record */ UNIV_INTERN ibool row_upd_changes_ord_field_binary_func( /*==================================*/ dict_index_t* index, /*!< in: index of the record */ const upd_t* update, /*!< in: update vector for the row; NOTE: the field numbers in this MUST be clustered index positions! */ #ifdef UNIV_DEBUG const que_thr_t*thr, /*!< in: query thread */ #endif /* UNIV_DEBUG */ const dtuple_t* row, /*!< in: old value of row, or NULL if the row and the data values in update are not known when this function is called, e.g., at compile time */ const row_ext_t*ext) /*!< NULL, or prefixes of the externally stored columns in the old row */ MY_ATTRIBUTE((nonnull(1,2), warn_unused_result)); #ifdef UNIV_DEBUG # define row_upd_changes_ord_field_binary(index,update,thr,row,ext) \ row_upd_changes_ord_field_binary_func(index,update,thr,row,ext) #else /* UNIV_DEBUG */ # define row_upd_changes_ord_field_binary(index,update,thr,row,ext) \ row_upd_changes_ord_field_binary_func(index,update,row,ext) #endif /* UNIV_DEBUG */ /***********************************************************//** Checks if an FTS indexed column is affected by an UPDATE. @return offset within fts_t::indexes if FTS indexed column updated else ULINT_UNDEFINED */ UNIV_INTERN ulint row_upd_changes_fts_column( /*=======================*/ dict_table_t* table, /*!< in: table */ upd_field_t* upd_field); /*!< in: field to check */ /***********************************************************//** Checks if an FTS Doc ID column is affected by an UPDATE. @return whether Doc ID column is affected */ UNIV_INTERN bool row_upd_changes_doc_id( /*===================*/ dict_table_t* table, /*!< in: table */ upd_field_t* upd_field) /*!< in: field to check */ MY_ATTRIBUTE((nonnull, warn_unused_result)); /***********************************************************//** Checks if an update vector changes an ordering field of an index record. This function is fast if the update vector is short or the number of ordering fields in the index is small. Otherwise, this can be quadratic. NOTE: we compare the fields as binary strings! @return TRUE if update vector may change an ordering field in an index record */ UNIV_INTERN ibool row_upd_changes_some_index_ord_field_binary( /*========================================*/ const dict_table_t* table, /*!< in: table */ const upd_t* update);/*!< in: update vector for the row */ /***********************************************************//** Updates a row in a table. This is a high-level function used in SQL execution graphs. @return query thread to run next or NULL */ UNIV_INTERN que_thr_t* row_upd_step( /*=========*/ que_thr_t* thr); /*!< in: query thread */ #endif /* !UNIV_HOTBACKUP */ /*********************************************************************//** Parses the log data of system field values. @return log data end or NULL */ UNIV_INTERN byte* row_upd_parse_sys_vals( /*===================*/ byte* ptr, /*!< in: buffer */ byte* end_ptr,/*!< in: buffer end */ ulint* pos, /*!< out: TRX_ID position in record */ trx_id_t* trx_id, /*!< out: trx id */ roll_ptr_t* roll_ptr);/*!< out: roll ptr */ /*********************************************************************//** Updates the trx id and roll ptr field in a clustered index record in database recovery. */ UNIV_INTERN void row_upd_rec_sys_fields_in_recovery( /*===============================*/ rec_t* rec, /*!< in/out: record */ page_zip_des_t* page_zip,/*!< in/out: compressed page, or NULL */ const ulint* offsets,/*!< in: array returned by rec_get_offsets() */ ulint pos, /*!< in: TRX_ID position in rec */ trx_id_t trx_id, /*!< in: transaction id */ roll_ptr_t roll_ptr);/*!< in: roll ptr of the undo log record */ /*********************************************************************//** Parses the log data written by row_upd_index_write_log. @return log data end or NULL */ UNIV_INTERN byte* row_upd_index_parse( /*================*/ byte* ptr, /*!< in: buffer */ byte* end_ptr,/*!< in: buffer end */ mem_heap_t* heap, /*!< in: memory heap where update vector is built */ upd_t** update_out);/*!< out: update vector */ /* Update vector field */ struct upd_field_t{ unsigned field_no:16; /*!< field number in an index, usually the clustered index, but in updating a secondary index record in btr0cur.cc this is the position in the secondary index */ #ifndef UNIV_HOTBACKUP unsigned orig_len:16; /*!< original length of the locally stored part of an externally stored column, or 0 */ que_node_t* exp; /*!< expression for calculating a new value: it refers to column values and constants in the symbol table of the query graph */ #endif /* !UNIV_HOTBACKUP */ dfield_t new_val; /*!< new value for the column */ }; /* Update vector structure */ struct upd_t{ ulint info_bits; /*!< new value of info bits to record; default is 0 */ ulint n_fields; /*!< number of update fields */ upd_field_t* fields; /*!< array of update fields */ }; #ifndef UNIV_HOTBACKUP /* Update node structure which also implements the delete operation of a row */ struct upd_node_t{ que_common_t common; /*!< node type: QUE_NODE_UPDATE */ ibool is_delete;/* TRUE if delete, FALSE if update */ ibool searched_update; /* TRUE if searched update, FALSE if positioned */ ibool in_mysql_interface; /* TRUE if the update node was created for the MySQL interface */ dict_foreign_t* foreign;/* NULL or pointer to a foreign key constraint if this update node is used in doing an ON DELETE or ON UPDATE operation */ upd_node_t* cascade_node;/* NULL or an update node template which is used to implement ON DELETE/UPDATE CASCADE or ... SET NULL for foreign keys */ mem_heap_t* cascade_heap;/* NULL or a mem heap where the cascade node is created */ sel_node_t* select; /*!< query graph subtree implementing a base table cursor: the rows returned will be updated */ btr_pcur_t* pcur; /*!< persistent cursor placed on the clustered index record which should be updated or deleted; the cursor is stored in the graph of 'select' field above, except in the case of the MySQL interface */ dict_table_t* table; /*!< table where updated */ upd_t* update; /*!< update vector for the row */ ulint update_n_fields; /* when this struct is used to implement a cascade operation for foreign keys, we store here the size of the buffer allocated for use as the update vector */ sym_node_list_t columns;/* symbol table nodes for the columns to retrieve from the table */ ibool has_clust_rec_x_lock; /* TRUE if the select which retrieves the records to update already sets an x-lock on the clustered record; note that it must always set at least an s-lock */ ulint cmpl_info;/* information extracted during query compilation; speeds up execution: UPD_NODE_NO_ORD_CHANGE and UPD_NODE_NO_SIZE_CHANGE, ORed */ /*----------------------*/ /* Local storage for this graph node */ ulint state; /*!< node execution state */ dict_index_t* index; /*!< NULL, or the next index whose record should be updated */ dtuple_t* row; /*!< NULL, or a copy (also fields copied to heap) of the row to update; this must be reset to NULL after a successful update */ row_ext_t* ext; /*!< NULL, or prefixes of the externally stored columns in the old row */ dtuple_t* upd_row;/* NULL, or a copy of the updated row */ row_ext_t* upd_ext;/* NULL, or prefixes of the externally stored columns in upd_row */ mem_heap_t* heap; /*!< memory heap used as auxiliary storage; this must be emptied after a successful update */ /*----------------------*/ sym_node_t* table_sym;/* table node in symbol table */ que_node_t* col_assign_list; /* column assignment list */ ulint magic_n; }; #define UPD_NODE_MAGIC_N 1579975 /* Node execution states */ #define UPD_NODE_SET_IX_LOCK 1 /* execution came to the node from a node above and if the field has_clust_rec_x_lock is FALSE, we should set an intention x-lock on the table */ #define UPD_NODE_UPDATE_CLUSTERED 2 /* clustered index record should be updated */ #define UPD_NODE_INSERT_CLUSTERED 3 /* clustered index record should be inserted, old record is already delete marked */ #define UPD_NODE_INSERT_BLOB 4 /* clustered index record should be inserted, old record is already delete-marked; non-updated BLOBs should be inherited by the new record and disowned by the old record */ #define UPD_NODE_UPDATE_ALL_SEC 5 /* an ordering field of the clustered index record was changed, or this is a delete operation: should update all the secondary index records */ #define UPD_NODE_UPDATE_SOME_SEC 6 /* secondary index entries should be looked at and updated if an ordering field changed */ /* Compilation info flags: these must fit within 3 bits; see trx0rec.h */ #define UPD_NODE_NO_ORD_CHANGE 1 /* no secondary index record will be changed in the update and no ordering field of the clustered index */ #define UPD_NODE_NO_SIZE_CHANGE 2 /* no record field size will be changed in the update */ #endif /* !UNIV_HOTBACKUP */ #ifndef UNIV_NONINL #include "row0upd.ic" #endif #endif