121 lines
3.4 KiB
C
121 lines
3.4 KiB
C
/*-------------------------------------------------------------------------
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*
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* pg_namespace.c
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* routines to support manipulation of the pg_namespace relation
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*
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* Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* src/backend/catalog/pg_namespace.c
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "access/htup_details.h"
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#include "access/table.h"
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#include "catalog/catalog.h"
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#include "catalog/dependency.h"
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#include "catalog/indexing.h"
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#include "catalog/objectaccess.h"
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#include "catalog/pg_namespace.h"
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#include "utils/builtins.h"
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#include "utils/rel.h"
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#include "utils/syscache.h"
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/* ----------------
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* NamespaceCreate
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*
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* Create a namespace (schema) with the given name and owner OID.
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*
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* If isTemp is true, this schema is a per-backend schema for holding
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* temporary tables. Currently, it is used to prevent it from being
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* linked as a member of any active extension. (If someone does CREATE
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* TEMP TABLE in an extension script, we don't want the temp schema to
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* become part of the extension). And to avoid checking for default ACL
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* for temp namespace (as it is not necessary).
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* ---------------
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*/
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Oid
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NamespaceCreate(const char *nspName, Oid ownerId, bool isTemp)
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{
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Relation nspdesc;
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HeapTuple tup;
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Oid nspoid;
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bool nulls[Natts_pg_namespace];
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Datum values[Natts_pg_namespace];
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NameData nname;
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TupleDesc tupDesc;
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ObjectAddress myself;
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int i;
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Acl *nspacl;
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/* sanity checks */
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if (!nspName)
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elog(ERROR, "no namespace name supplied");
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/* make sure there is no existing namespace of same name */
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if (SearchSysCacheExists1(NAMESPACENAME, PointerGetDatum(nspName)))
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ereport(ERROR,
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(errcode(ERRCODE_DUPLICATE_SCHEMA),
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errmsg("schema \"%s\" already exists", nspName)));
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if (!isTemp)
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nspacl = get_user_default_acl(OBJECT_SCHEMA, ownerId,
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InvalidOid);
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else
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nspacl = NULL;
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nspdesc = table_open(NamespaceRelationId, RowExclusiveLock);
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tupDesc = nspdesc->rd_att;
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/* initialize nulls and values */
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for (i = 0; i < Natts_pg_namespace; i++)
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{
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nulls[i] = false;
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values[i] = (Datum) NULL;
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}
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nspoid = GetNewOidWithIndex(nspdesc, NamespaceOidIndexId,
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Anum_pg_namespace_oid);
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values[Anum_pg_namespace_oid - 1] = ObjectIdGetDatum(nspoid);
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namestrcpy(&nname, nspName);
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values[Anum_pg_namespace_nspname - 1] = NameGetDatum(&nname);
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values[Anum_pg_namespace_nspowner - 1] = ObjectIdGetDatum(ownerId);
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if (nspacl != NULL)
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values[Anum_pg_namespace_nspacl - 1] = PointerGetDatum(nspacl);
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else
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nulls[Anum_pg_namespace_nspacl - 1] = true;
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tup = heap_form_tuple(tupDesc, values, nulls);
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CatalogTupleInsert(nspdesc, tup);
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Assert(OidIsValid(nspoid));
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table_close(nspdesc, RowExclusiveLock);
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/* Record dependencies */
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myself.classId = NamespaceRelationId;
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myself.objectId = nspoid;
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myself.objectSubId = 0;
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/* dependency on owner */
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recordDependencyOnOwner(NamespaceRelationId, nspoid, ownerId);
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/* dependencies on roles mentioned in default ACL */
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recordDependencyOnNewAcl(NamespaceRelationId, nspoid, 0, ownerId, nspacl);
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/* dependency on extension ... but not for magic temp schemas */
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if (!isTemp)
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recordDependencyOnCurrentExtension(&myself, false);
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/* Post creation hook for new schema */
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InvokeObjectPostCreateHook(NamespaceRelationId, nspoid, 0);
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return nspoid;
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}
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