mirror of https://github.com/postgres/postgres
in schemas other than the system namespace; however, there's no search path yet, and not all operations work yet on tables outside the system namespace.ecpg_big_bison
Tom Lane
24 years ago
parent
da631e931f
commit
1dbf8aa7a8
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/*-------------------------------------------------------------------------
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* |
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* namespace.c |
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* code to support accessing and searching namespaces |
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* |
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* This is separate from pg_namespace.c, which contains the routines that |
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* directly manipulate the pg_namespace system catalog. This module |
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* provides routines associated with defining a "namespace search path" |
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* and implementing search-path-controlled searches. |
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* |
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* |
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* Portions Copyright (c) 1996-2001, 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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* IDENTIFICATION |
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* $Header: /cvsroot/pgsql/src/backend/catalog/namespace.c,v 1.1 2002/03/26 19:15:32 tgl Exp $ |
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* |
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*------------------------------------------------------------------------- |
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*/ |
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#include "postgres.h" |
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#include "catalog/namespace.h" |
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#include "catalog/pg_namespace.h" |
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#include "miscadmin.h" |
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#include "utils/lsyscache.h" |
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#include "utils/syscache.h" |
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/*
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* RangeVarGetRelid |
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* Given a RangeVar describing an existing relation, |
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* select the proper namespace and look up the relation OID. |
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* |
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* If the relation is not found, return InvalidOid if failOK = true, |
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* otherwise raise an error. |
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*/ |
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Oid |
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RangeVarGetRelid(const RangeVar *relation, bool failOK) |
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{ |
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Oid namespaceId; |
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Oid relId; |
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/*
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* We check the catalog name and then ignore it. |
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*/ |
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if (relation->catalogname) |
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{ |
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if (strcmp(relation->catalogname, DatabaseName) != 0) |
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elog(ERROR, "Cross-database references are not implemented"); |
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} |
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|
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if (relation->schemaname) |
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{ |
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namespaceId = GetSysCacheOid(NAMESPACENAME, |
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CStringGetDatum(relation->schemaname), |
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0, 0, 0); |
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if (!OidIsValid(namespaceId)) |
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elog(ERROR, "Namespace \"%s\" does not exist", |
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relation->schemaname); |
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relId = get_relname_relid(relation->relname, namespaceId); |
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} |
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else |
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{ |
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relId = RelnameGetRelid(relation->relname); |
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} |
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if (!OidIsValid(relId) && !failOK) |
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{ |
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if (relation->schemaname) |
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elog(ERROR, "Relation \"%s\".\"%s\" does not exist", |
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relation->schemaname, relation->relname); |
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else |
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elog(ERROR, "Relation \"%s\" does not exist", |
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relation->relname); |
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} |
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return relId; |
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} |
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|
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/*
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* RangeVarGetCreationNamespace |
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* Given a RangeVar describing a to-be-created relation, |
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* choose which namespace to create it in. |
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*/ |
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Oid |
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RangeVarGetCreationNamespace(const RangeVar *newRelation) |
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{ |
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Oid namespaceId; |
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/*
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* We check the catalog name and then ignore it. |
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*/ |
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if (newRelation->catalogname) |
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{ |
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if (strcmp(newRelation->catalogname, DatabaseName) != 0) |
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elog(ERROR, "Cross-database references are not implemented"); |
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} |
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if (newRelation->schemaname) |
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{ |
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namespaceId = GetSysCacheOid(NAMESPACENAME, |
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CStringGetDatum(newRelation->schemaname), |
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0, 0, 0); |
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if (!OidIsValid(namespaceId)) |
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elog(ERROR, "Namespace \"%s\" does not exist", |
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newRelation->schemaname); |
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} |
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else |
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{ |
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/* XXX Wrong! Need to get a default schema from somewhere */ |
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namespaceId = PG_CATALOG_NAMESPACE; |
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} |
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return namespaceId; |
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} |
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/*
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* RelnameGetRelid |
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* Try to resolve an unqualified relation name. |
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* Returns OID if relation found in search path, else InvalidOid. |
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*/ |
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Oid |
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RelnameGetRelid(const char *relname) |
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{ |
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/* XXX Wrong! must search search path */ |
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return get_relname_relid(relname, PG_CATALOG_NAMESPACE); |
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} |
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@ -0,0 +1,26 @@ |
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/*-------------------------------------------------------------------------
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* |
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* namespace.h |
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* prototypes for functions in backend/catalog/namespace.c |
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* |
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* |
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* Portions Copyright (c) 1996-2001, 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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* $Id: namespace.h,v 1.1 2002/03/26 19:16:28 tgl Exp $ |
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* |
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*------------------------------------------------------------------------- |
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*/ |
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#ifndef NAMESPACE_H |
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#define NAMESPACE_H |
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#include "nodes/primnodes.h" |
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extern Oid RangeVarGetRelid(const RangeVar *relation, bool failOK); |
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extern Oid RangeVarGetCreationNamespace(const RangeVar *newRelation); |
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extern Oid RelnameGetRelid(const char *relname); |
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#endif /* NAMESPACE_H */ |
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