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/*-------------------------------------------------------------------------
*
* namespace.c
* code to support accessing and searching namespaces
*
* This is separate from pg_namespace.c, which contains the routines that
* directly manipulate the pg_namespace system catalog. This module
* provides routines associated with defining a "namespace search path"
* and implementing search-path-controlled searches.
*
*
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/catalog/namespace.c,v 1.2 2002/03/29 19:06:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "catalog/namespace.h"
#include "catalog/pg_namespace.h"
#include "miscadmin.h"
#include "nodes/makefuncs.h"
#include "utils/lsyscache.h"
#include "utils/syscache.h"
/*
* RangeVarGetRelid
* Given a RangeVar describing an existing relation,
* select the proper namespace and look up the relation OID.
*
* If the relation is not found, return InvalidOid if failOK = true,
* otherwise raise an error.
*/
Oid
RangeVarGetRelid(const RangeVar *relation, bool failOK)
{
Oid namespaceId;
Oid relId;
/*
* We check the catalog name and then ignore it.
*/
if (relation->catalogname)
{
if (strcmp(relation->catalogname, DatabaseName) != 0)
elog(ERROR, "Cross-database references are not implemented");
}
if (relation->schemaname)
{
namespaceId = GetSysCacheOid(NAMESPACENAME,
CStringGetDatum(relation->schemaname),
0, 0, 0);
if (!OidIsValid(namespaceId))
elog(ERROR, "Namespace \"%s\" does not exist",
relation->schemaname);
relId = get_relname_relid(relation->relname, namespaceId);
}
else
{
relId = RelnameGetRelid(relation->relname);
}
if (!OidIsValid(relId) && !failOK)
{
if (relation->schemaname)
elog(ERROR, "Relation \"%s\".\"%s\" does not exist",
relation->schemaname, relation->relname);
else
elog(ERROR, "Relation \"%s\" does not exist",
relation->relname);
}
return relId;
}
/*
* RangeVarGetCreationNamespace
* Given a RangeVar describing a to-be-created relation,
* choose which namespace to create it in.
*/
Oid
RangeVarGetCreationNamespace(const RangeVar *newRelation)
{
Oid namespaceId;
/*
* We check the catalog name and then ignore it.
*/
if (newRelation->catalogname)
{
if (strcmp(newRelation->catalogname, DatabaseName) != 0)
elog(ERROR, "Cross-database references are not implemented");
}
if (newRelation->schemaname)
{
namespaceId = GetSysCacheOid(NAMESPACENAME,
CStringGetDatum(newRelation->schemaname),
0, 0, 0);
if (!OidIsValid(namespaceId))
elog(ERROR, "Namespace \"%s\" does not exist",
newRelation->schemaname);
}
else
{
/* XXX Wrong! Need to get a default schema from somewhere */
namespaceId = PG_CATALOG_NAMESPACE;
}
return namespaceId;
}
/*
* RelnameGetRelid
* Try to resolve an unqualified relation name.
* Returns OID if relation found in search path, else InvalidOid.
*/
Oid
RelnameGetRelid(const char *relname)
{
/* XXX Wrong! must search search path */
return get_relname_relid(relname, PG_CATALOG_NAMESPACE);
}
/*
* QualifiedNameGetCreationNamespace
* Given a possibly-qualified name for an object (in List-of-Values
* format), determine what namespace the object should be created in.
* Also extract and return the object name (last component of list).
*/
Oid
QualifiedNameGetCreationNamespace(List *names, char **objname_p)
{
char *catalogname;
char *schemaname = NULL;
char *objname = NULL;
Oid namespaceId;
/* deconstruct the name list */
switch (length(names))
{
case 1:
objname = strVal(lfirst(names));
break;
case 2:
schemaname = strVal(lfirst(names));
objname = strVal(lsecond(names));
break;
case 3:
catalogname = strVal(lfirst(names));
schemaname = strVal(lsecond(names));
objname = strVal(lfirst(lnext(lnext(names))));
/*
* We check the catalog name and then ignore it.
*/
if (strcmp(catalogname, DatabaseName) != 0)
elog(ERROR, "Cross-database references are not implemented");
break;
default:
elog(ERROR, "Improper qualified name (too many dotted names)");
break;
}
if (schemaname)
{
namespaceId = GetSysCacheOid(NAMESPACENAME,
CStringGetDatum(schemaname),
0, 0, 0);
if (!OidIsValid(namespaceId))
elog(ERROR, "Namespace \"%s\" does not exist",
schemaname);
}
else
{
/* XXX Wrong! Need to get a default schema from somewhere */
namespaceId = PG_CATALOG_NAMESPACE;
}
*objname_p = objname;
return namespaceId;
}
/*
* makeRangeVarFromNameList
* Utility routine to convert a qualified-name list into RangeVar form.
*/
RangeVar *
makeRangeVarFromNameList(List *names)
{
RangeVar *rel = makeRangeVar(NULL, NULL);
switch (length(names))
{
case 1:
rel->relname = strVal(lfirst(names));
break;
case 2:
rel->schemaname = strVal(lfirst(names));
rel->relname = strVal(lsecond(names));
break;
case 3:
rel->catalogname = strVal(lfirst(names));
rel->schemaname = strVal(lsecond(names));
rel->relname = strVal(lfirst(lnext(lnext(names))));
break;
default:
elog(ERROR, "Improper relation name (too many dotted names)");
break;
}
return rel;
}
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