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Implement DROP SCHEMA. It lacks support for dropping conversions and

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operator classes, both of which are schema-local and so should really
be droppable.
This commit is contained in:
Tom Lane
2002-07-18 16:47:26 +00:00
parent 8bed350c4a
commit 11333426f1
16 changed files with 438 additions and 107 deletions
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75
src/backend/commands/schemacmds.c
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@ -1,20 +1,23 @@
/*-------------------------------------------------------------------------
*
* schemacmds.c
* schema creation command support code
* schema creation/manipulation commands
*
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/schemacmds.c,v 1.4 2002/06/11 13:40:50 wieck Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/schemacmds.c,v 1.5 2002/07/18 16:47:24 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/heapam.h"
#include "catalog/catalog.h"
#include "catalog/catname.h"
#include "catalog/dependency.h"
#include "catalog/namespace.h"
#include "catalog/pg_namespace.h"
#include "commands/schemacmds.h"
@ -23,6 +26,7 @@
#include "tcop/utility.h"
#include "utils/acl.h"
#include "utils/lsyscache.h"
#include "utils/syscache.h"
/*
@ -139,3 +143,70 @@ CreateSchemaCommand(CreateSchemaStmt *stmt)
/* Reset current user */
SetUserId(saved_userid);
}
/*
* RemoveSchema
* Removes a schema.
*/
void
RemoveSchema(List *names, DropBehavior behavior)
{
char *namespaceName;
Oid namespaceId;
ObjectAddress object;
if (length(names) != 1)
elog(ERROR, "Schema name may not be qualified");
namespaceName = strVal(lfirst(names));
namespaceId = GetSysCacheOid(NAMESPACENAME,
CStringGetDatum(namespaceName),
0, 0, 0);
if (!OidIsValid(namespaceId))
elog(ERROR, "Schema \"%s\" does not exist", namespaceName);
/* Permission check */
if (!pg_namespace_ownercheck(namespaceId, GetUserId()))
aclcheck_error(ACLCHECK_NOT_OWNER, namespaceName);
/*
* Do the deletion. Objects contained in the schema are removed
* by means of their dependency links to the schema.
*
* XXX currently, index opclasses don't have creation/deletion
* commands, so they will not get removed when the containing
* schema is removed. This is annoying but not fatal.
*/
object.classId = get_system_catalog_relid(NamespaceRelationName);
object.objectId = namespaceId;
object.objectSubId = 0;
performDeletion(&object, behavior);
}
/*
* Guts of schema deletion.
*/
void
RemoveSchemaById(Oid schemaOid)
{
Relation relation;
HeapTuple tup;
relation = heap_openr(NamespaceRelationName, RowExclusiveLock);
tup = SearchSysCache(NAMESPACEOID,
ObjectIdGetDatum(schemaOid),
0, 0, 0);
if (!HeapTupleIsValid(tup))
elog(ERROR, "RemoveSchemaById: schema %u not found",
schemaOid);
simple_heap_delete(relation, &tup->t_self);
ReleaseSysCache(tup);
heap_close(relation, RowExclusiveLock);
}