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/*-------------------------------------------------------------------------
*
* pg_conversion.c
* routines to support manipulation of the pg_conversion relation
*
* Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/backend/catalog/pg_conversion.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/heapam.h"
#include "access/htup_details.h"
#include "access/sysattr.h"
#include "access/tableam.h"
#include "catalog/catalog.h"
#include "catalog/dependency.h"
#include "catalog/indexing.h"
#include "catalog/objectaccess.h"
#include "catalog/pg_conversion.h"
#include "catalog/pg_namespace.h"
#include "catalog/pg_proc.h"
#include "mb/pg_wchar.h"
#include "utils/builtins.h"
#include "utils/catcache.h"
#include "utils/fmgroids.h"
#include "utils/rel.h"
#include "utils/syscache.h"
/*
* ConversionCreate
*
* Add a new tuple to pg_conversion.
*/
ObjectAddress
ConversionCreate(const char *conname, Oid connamespace,
Oid conowner,
int32 conforencoding, int32 contoencoding,
Oid conproc, bool def)
{
int i;
Relation rel;
TupleDesc tupDesc;
HeapTuple tup;
Oid oid;
bool nulls[Natts_pg_conversion];
Datum values[Natts_pg_conversion];
NameData cname;
ObjectAddress myself,
referenced;
/* sanity checks */
if (!conname)
elog(ERROR, "no conversion name supplied");
/* make sure there is no existing conversion of same name */
if (SearchSysCacheExists2(CONNAMENSP,
PointerGetDatum(conname),
ObjectIdGetDatum(connamespace)))
ereport(ERROR,
(errcode(ERRCODE_DUPLICATE_OBJECT),
errmsg("conversion \"%s\" already exists", conname)));
if (def)
{
/*
* make sure there is no existing default <for encoding><to encoding>
* pair in this name space
*/
if (FindDefaultConversion(connamespace,
conforencoding,
contoencoding))
ereport(ERROR,
(errcode(ERRCODE_DUPLICATE_OBJECT),
errmsg("default conversion for %s to %s already exists",
pg_encoding_to_char(conforencoding),
pg_encoding_to_char(contoencoding))));
}
/* open pg_conversion */
rel = table_open(ConversionRelationId, RowExclusiveLock);
tupDesc = rel->rd_att;
/* initialize nulls and values */
for (i = 0; i < Natts_pg_conversion; i++)
{
nulls[i] = false;
values[i] = (Datum) NULL;
}
/* form a tuple */
namestrcpy(&cname, conname);
oid = GetNewOidWithIndex(rel, ConversionOidIndexId,
Anum_pg_conversion_oid);
values[Anum_pg_conversion_oid - 1] = ObjectIdGetDatum(oid);
values[Anum_pg_conversion_conname - 1] = NameGetDatum(&cname);
values[Anum_pg_conversion_connamespace - 1] = ObjectIdGetDatum(connamespace);
values[Anum_pg_conversion_conowner - 1] = ObjectIdGetDatum(conowner);
values[Anum_pg_conversion_conforencoding - 1] = Int32GetDatum(conforencoding);
values[Anum_pg_conversion_contoencoding - 1] = Int32GetDatum(contoencoding);
values[Anum_pg_conversion_conproc - 1] = ObjectIdGetDatum(conproc);
values[Anum_pg_conversion_condefault - 1] = BoolGetDatum(def);
tup = heap_form_tuple(tupDesc, values, nulls);
/* insert a new tuple */
CatalogTupleInsert(rel, tup);
myself.classId = ConversionRelationId;
myself.objectId = oid;
myself.objectSubId = 0;
/* create dependency on conversion procedure */
referenced.classId = ProcedureRelationId;
referenced.objectId = conproc;
referenced.objectSubId = 0;
recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
/* create dependency on namespace */
referenced.classId = NamespaceRelationId;
referenced.objectId = connamespace;
referenced.objectSubId = 0;
recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
/* create dependency on owner */
recordDependencyOnOwner(ConversionRelationId, oid, conowner);
/* dependency on extension */
recordDependencyOnCurrentExtension(&myself, false);
/* Post creation hook for new conversion */
InvokeObjectPostCreateHook(ConversionRelationId, oid, 0);
heap_freetuple(tup);
table_close(rel, RowExclusiveLock);
return myself;
}
/*
* FindDefaultConversion
*
* Find "default" conversion proc by for_encoding and to_encoding in the
* given namespace.
*
* If found, returns the procedure's oid, otherwise InvalidOid. Note that
* you get the procedure's OID not the conversion's OID!
*/
Oid
FindDefaultConversion(Oid name_space, int32 for_encoding, int32 to_encoding)
{
CatCList *catlist;
HeapTuple tuple;
Form_pg_conversion body;
Oid proc = InvalidOid;
int i;
catlist = SearchSysCacheList3(CONDEFAULT,
ObjectIdGetDatum(name_space),
Int32GetDatum(for_encoding),
Int32GetDatum(to_encoding));
for (i = 0; i < catlist->n_members; i++)
{
tuple = &catlist->members[i]->tuple;
body = (Form_pg_conversion) GETSTRUCT(tuple);
if (body->condefault)
{
proc = body->conproc;
break;
}
}
ReleaseSysCacheList(catlist);
return proc;
}
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