/*-------------------------------------------------------------------------
*
* dropcmds.c
* handle various "DROP" operations
*
* Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/backend/catalog/dropcmds.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/heapam.h"
#include "access/htup_details.h"
#include "catalog/dependency.h"
#include "catalog/namespace.h"
#include "catalog/objectaddress.h"
#include "catalog/pg_class.h"
#include "catalog/pg_proc.h"
#include "commands/defrem.h"
#include "miscadmin.h"
#include "nodes/makefuncs.h"
#include "parser/parse_type.h"
#include "utils/builtins.h"
#include "utils/syscache.h"
static void does_not_exist_skipping(ObjectType objtype,
List *objname, List *objargs);
/*
* Drop one or more objects.
*
* We don't currently handle all object types here. Relations, for example,
* require special handling, because (for example) indexes have additional
* locking requirements.
*
* We look up all the objects first, and then delete them in a single
* performMultipleDeletions() call. This avoids unnecessary DROP RESTRICT
* errors if there are dependencies between them.
*/
void
RemoveObjects(DropStmt *stmt)
{
ObjectAddresses *objects;
ListCell *cell1;
ListCell *cell2 = NULL;
objects = new_object_addresses();
foreach(cell1, stmt->objects)
{
ObjectAddress address;
List *objname = lfirst(cell1);
List *objargs = NIL;
Relation relation = NULL;
Oid namespaceId;
if (stmt->arguments)
{
cell2 = (!cell2 ? list_head(stmt->arguments) : lnext(cell2));
objargs = lfirst(cell2);
}
/* Get an ObjectAddress for the object. */
address = get_object_address(stmt->removeType,
objname, objargs,
&relation,
AccessExclusiveLock,
stmt->missing_ok);
/* Issue NOTICE if supplied object was not found. */
if (!OidIsValid(address.objectId))
{
does_not_exist_skipping(stmt->removeType, objname, objargs);
continue;
}
/*
* Although COMMENT ON FUNCTION, SECURITY LABEL ON FUNCTION, etc. are
* happy to operate on an aggregate as on any other function, we have
* historically not allowed this for DROP FUNCTION.
*/
if (stmt->removeType == OBJECT_FUNCTION)
{
Oid funcOid = address.objectId;
HeapTuple tup;
tup = SearchSysCache1(PROCOID, ObjectIdGetDatum(funcOid));
if (!HeapTupleIsValid(tup)) /* should not happen */
elog(ERROR, "cache lookup failed for function %u", funcOid);
if (((Form_pg_proc) GETSTRUCT(tup))->proisagg)
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("\"%s\" is an aggregate function",
NameListToString(objname)),
errhint("Use DROP AGGREGATE to drop aggregate functions.")));
ReleaseSysCache(tup);
}
/* Check permissions. */
namespaceId = get_object_namespace(&address);
if (!OidIsValid(namespaceId) ||
!pg_namespace_ownercheck(namespaceId, GetUserId()))
check_object_ownership(GetUserId(), stmt->removeType, address,
objname, objargs, relation);
/* Release any relcache reference count, but keep lock until commit. */
if (relation)
heap_close(relation, NoLock);
add_exact_object_address(&address, objects);
}
/* Here we really delete them. */
performMultipleDeletions(objects, stmt->behavior, 0);
free_object_addresses(objects);
}
/*
* Generate a NOTICE stating that the named object was not found, and is
* being skipped. This is only relevant when "IF EXISTS" is used; otherwise,
* get_object_address() will throw an ERROR.
*/
static void
does_not_exist_skipping(ObjectType objtype, List *objname, List *objargs)
{
const char *msg = NULL;
char *name = NULL;
char *args = NULL;
switch (objtype)
{
case OBJECT_TYPE:
case OBJECT_DOMAIN:
msg = gettext_noop("type \"%s\" does not exist, skipping");
name = TypeNameToString(makeTypeNameFromNameList(objname));
break;
case OBJECT_COLLATION:
msg = gettext_noop("collation \"%s\" does not exist, skipping");
name = NameListToString(objname);
break;
case OBJECT_CONVERSION:
msg = gettext_noop("conversion \"%s\" does not exist, skipping");
name = NameListToString(objname);
break;
case OBJECT_SCHEMA:
msg = gettext_noop("schema \"%s\" does not exist, skipping");
name = NameListToString(objname);
break;
case OBJECT_TSPARSER:
msg = gettext_noop("text search parser \"%s\" does not exist, skipping");
name = NameListToString(objname);
break;
case OBJECT_TSDICTIONARY:
msg = gettext_noop("text search dictionary \"%s\" does not exist, skipping");
name = NameListToString(objname);
break;
case OBJECT_TSTEMPLATE:
msg = gettext_noop("text search template \"%s\" does not exist, skipping");
name = NameListToString(objname);
break;
case OBJECT_TSCONFIGURATION:
msg = gettext_noop("text search configuration \"%s\" does not exist, skipping");
name = NameListToString(objname);
break;
case OBJECT_EXTENSION:
msg = gettext_noop("extension \"%s\" does not exist, skipping");
name = NameListToString(objname);
break;
case OBJECT_FUNCTION:
msg = gettext_noop("function %s(%s) does not exist, skipping");
name = NameListToString(objname);
args = TypeNameListToString(objargs);
break;
case OBJECT_AGGREGATE:
msg = gettext_noop("aggregate %s(%s) does not exist, skipping");
name = NameListToString(objname);
args = TypeNameListToString(objargs);
break;
case OBJECT_OPERATOR:
msg = gettext_noop("operator %s does not exist, skipping");
name = NameListToString(objname);
break;
case OBJECT_LANGUAGE:
msg = gettext_noop("language \"%s\" does not exist, skipping");
name = NameListToString(objname);
break;
case OBJECT_CAST:
msg = gettext_noop("cast from type %s to type %s does not exist, skipping");
name = format_type_be(typenameTypeId(NULL,
(TypeName *) linitial(objname)));
args = format_type_be(typenameTypeId(NULL,
(TypeName *) linitial(objargs)));
break;
case OBJECT_TRIGGER:
msg = gettext_noop("trigger \"%s\" for table \"%s\" does not exist, skipping");
name = strVal(llast(objname));
args = NameListToString(list_truncate(list_copy(objname),
list_length(objname) - 1));
break;
case OBJECT_EVENT_TRIGGER:
msg = gettext_noop("event trigger \"%s\" does not exist, skipping");
name = NameListToString(objname);
break;
case OBJECT_RULE:
msg = gettext_noop("rule \"%s\" for relation \"%s\" does not exist, skipping");
name = strVal(llast(objname));
args = NameListToString(list_truncate(list_copy(objname),
list_length(objname) - 1));
break;
case OBJECT_FDW:
msg = gettext_noop("foreign-data wrapper \"%s\" does not exist, skipping");
name = NameListToString(objname);
break;
case OBJECT_FOREIGN_SERVER:
msg = gettext_noop("server \"%s\" does not exist, skipping");
name = NameListToString(objname);
break;
case OBJECT_OPCLASS:
msg = gettext_noop("operator class \"%s\" does not exist for access method \"%s\", skipping");
name = NameListToString(objname);
args = strVal(linitial(objargs));
break;
case OBJECT_OPFAMILY:
msg = gettext_noop("operator family \"%s\" does not exist for access method \"%s\", skipping");
name = NameListToString(objname);
args = strVal(linitial(objargs));
break;
default:
elog(ERROR, "unexpected object type (%d)", (int) objtype);
break;
}
if (!args)
ereport(NOTICE, (errmsg(msg, name)));
else
ereport(NOTICE, (errmsg(msg, name, args)));
}