493 lines
15 KiB
C
493 lines
15 KiB
C
/*-------------------------------------------------------------------------
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*
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* dropcmds.c
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* handle various "DROP" operations
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*
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* Portions Copyright (c) 1996-2019, 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/commands/dropcmds.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 "access/xact.h"
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#include "catalog/dependency.h"
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#include "catalog/namespace.h"
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#include "catalog/objectaddress.h"
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#include "catalog/pg_class.h"
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#include "catalog/pg_proc.h"
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#include "commands/defrem.h"
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#include "miscadmin.h"
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#include "nodes/makefuncs.h"
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#include "parser/parse_type.h"
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#include "utils/builtins.h"
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#include "utils/lsyscache.h"
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#include "utils/syscache.h"
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static void does_not_exist_skipping(ObjectType objtype,
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Node *object);
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static bool owningrel_does_not_exist_skipping(List *object,
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const char **msg, char **name);
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static bool schema_does_not_exist_skipping(List *object,
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const char **msg, char **name);
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static bool type_in_list_does_not_exist_skipping(List *typenames,
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const char **msg, char **name);
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/*
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* Drop one or more objects.
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*
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* We don't currently handle all object types here. Relations, for example,
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* require special handling, because (for example) indexes have additional
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* locking requirements.
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*
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* We look up all the objects first, and then delete them in a single
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* performMultipleDeletions() call. This avoids unnecessary DROP RESTRICT
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* errors if there are dependencies between them.
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*/
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void
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RemoveObjects(DropStmt *stmt)
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{
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ObjectAddresses *objects;
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ListCell *cell1;
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objects = new_object_addresses();
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foreach(cell1, stmt->objects)
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{
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ObjectAddress address;
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Node *object = lfirst(cell1);
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Relation relation = NULL;
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Oid namespaceId;
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/* Get an ObjectAddress for the object. */
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address = get_object_address(stmt->removeType,
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object,
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&relation,
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AccessExclusiveLock,
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stmt->missing_ok);
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/*
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* Issue NOTICE if supplied object was not found. Note this is only
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* relevant in the missing_ok case, because otherwise
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* get_object_address would have thrown an error.
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*/
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if (!OidIsValid(address.objectId))
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{
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Assert(stmt->missing_ok);
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does_not_exist_skipping(stmt->removeType, object);
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continue;
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}
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/*
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* Although COMMENT ON FUNCTION, SECURITY LABEL ON FUNCTION, etc. are
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* happy to operate on an aggregate as on any other function, we have
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* historically not allowed this for DROP FUNCTION.
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*/
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if (stmt->removeType == OBJECT_FUNCTION)
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{
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if (get_func_prokind(address.objectId) == PROKIND_AGGREGATE)
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ereport(ERROR,
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(errcode(ERRCODE_WRONG_OBJECT_TYPE),
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errmsg("\"%s\" is an aggregate function",
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NameListToString(castNode(ObjectWithArgs, object)->objname)),
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errhint("Use DROP AGGREGATE to drop aggregate functions.")));
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}
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/* Check permissions. */
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namespaceId = get_object_namespace(&address);
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if (!OidIsValid(namespaceId) ||
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!pg_namespace_ownercheck(namespaceId, GetUserId()))
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check_object_ownership(GetUserId(), stmt->removeType, address,
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object, relation);
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/*
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* Make note if a temporary namespace has been accessed in this
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* transaction.
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*/
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if (OidIsValid(namespaceId) && isTempNamespace(namespaceId))
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MyXactFlags |= XACT_FLAGS_ACCESSEDTEMPNAMESPACE;
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/* Release any relcache reference count, but keep lock until commit. */
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if (relation)
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table_close(relation, NoLock);
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add_exact_object_address(&address, objects);
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}
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/* Here we really delete them. */
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performMultipleDeletions(objects, stmt->behavior, 0);
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free_object_addresses(objects);
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}
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/*
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* owningrel_does_not_exist_skipping
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* Subroutine for RemoveObjects
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*
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* After determining that a specification for a rule or trigger returns that
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* the specified object does not exist, test whether its owning relation, and
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* its schema, exist or not; if they do, return false --- the trigger or rule
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* itself is missing instead. If the owning relation or its schema do not
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* exist, fill the error message format string and name, and return true.
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*/
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static bool
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owningrel_does_not_exist_skipping(List *object, const char **msg, char **name)
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{
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List *parent_object;
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RangeVar *parent_rel;
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parent_object = list_truncate(list_copy(object),
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list_length(object) - 1);
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if (schema_does_not_exist_skipping(parent_object, msg, name))
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return true;
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parent_rel = makeRangeVarFromNameList(parent_object);
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if (!OidIsValid(RangeVarGetRelid(parent_rel, NoLock, true)))
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{
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*msg = gettext_noop("relation \"%s\" does not exist, skipping");
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*name = NameListToString(parent_object);
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return true;
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}
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return false;
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}
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/*
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* schema_does_not_exist_skipping
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* Subroutine for RemoveObjects
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*
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* After determining that a specification for a schema-qualifiable object
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* refers to an object that does not exist, test whether the specified schema
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* exists or not. If no schema was specified, or if the schema does exist,
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* return false -- the object itself is missing instead. If the specified
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* schema does not exist, fill the error message format string and the
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* specified schema name, and return true.
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*/
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static bool
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schema_does_not_exist_skipping(List *object, const char **msg, char **name)
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{
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RangeVar *rel;
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rel = makeRangeVarFromNameList(object);
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if (rel->schemaname != NULL &&
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!OidIsValid(LookupNamespaceNoError(rel->schemaname)))
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{
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*msg = gettext_noop("schema \"%s\" does not exist, skipping");
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*name = rel->schemaname;
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return true;
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}
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return false;
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}
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/*
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* type_in_list_does_not_exist_skipping
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* Subroutine for RemoveObjects
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*
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* After determining that a specification for a function, cast, aggregate or
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* operator returns that the specified object does not exist, test whether the
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* involved datatypes, and their schemas, exist or not; if they do, return
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* false --- the original object itself is missing instead. If the datatypes
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* or schemas do not exist, fill the error message format string and the
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* missing name, and return true.
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*
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* First parameter is a list of TypeNames.
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*/
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static bool
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type_in_list_does_not_exist_skipping(List *typenames, const char **msg,
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char **name)
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{
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ListCell *l;
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foreach(l, typenames)
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{
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TypeName *typeName = lfirst_node(TypeName, l);
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if (typeName != NULL)
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{
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if (!OidIsValid(LookupTypeNameOid(NULL, typeName, true)))
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{
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/* type doesn't exist, try to find why */
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if (schema_does_not_exist_skipping(typeName->names, msg, name))
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return true;
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*msg = gettext_noop("type \"%s\" does not exist, skipping");
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*name = TypeNameToString(typeName);
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return true;
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}
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}
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}
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return false;
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}
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/*
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* does_not_exist_skipping
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* Subroutine for RemoveObjects
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*
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* Generate a NOTICE stating that the named object was not found, and is
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* being skipped. This is only relevant when "IF EXISTS" is used; otherwise,
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* get_object_address() in RemoveObjects would have thrown an ERROR.
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*/
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static void
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does_not_exist_skipping(ObjectType objtype, Node *object)
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{
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const char *msg = NULL;
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char *name = NULL;
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char *args = NULL;
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switch (objtype)
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{
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case OBJECT_ACCESS_METHOD:
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msg = gettext_noop("access method \"%s\" does not exist, skipping");
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name = strVal((Value *) object);
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break;
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case OBJECT_TYPE:
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case OBJECT_DOMAIN:
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{
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TypeName *typ = castNode(TypeName, object);
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if (!schema_does_not_exist_skipping(typ->names, &msg, &name))
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{
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msg = gettext_noop("type \"%s\" does not exist, skipping");
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name = TypeNameToString(typ);
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}
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}
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break;
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case OBJECT_COLLATION:
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if (!schema_does_not_exist_skipping(castNode(List, object), &msg, &name))
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{
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msg = gettext_noop("collation \"%s\" does not exist, skipping");
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name = NameListToString(castNode(List, object));
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}
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break;
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case OBJECT_CONVERSION:
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if (!schema_does_not_exist_skipping(castNode(List, object), &msg, &name))
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{
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msg = gettext_noop("conversion \"%s\" does not exist, skipping");
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name = NameListToString(castNode(List, object));
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}
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break;
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case OBJECT_SCHEMA:
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msg = gettext_noop("schema \"%s\" does not exist, skipping");
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name = strVal((Value *) object);
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break;
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case OBJECT_STATISTIC_EXT:
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if (!schema_does_not_exist_skipping(castNode(List, object), &msg, &name))
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{
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msg = gettext_noop("statistics object \"%s\" does not exist, skipping");
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name = NameListToString(castNode(List, object));
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}
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break;
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case OBJECT_TSPARSER:
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if (!schema_does_not_exist_skipping(castNode(List, object), &msg, &name))
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{
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msg = gettext_noop("text search parser \"%s\" does not exist, skipping");
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name = NameListToString(castNode(List, object));
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}
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break;
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case OBJECT_TSDICTIONARY:
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if (!schema_does_not_exist_skipping(castNode(List, object), &msg, &name))
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{
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msg = gettext_noop("text search dictionary \"%s\" does not exist, skipping");
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name = NameListToString(castNode(List, object));
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}
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break;
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case OBJECT_TSTEMPLATE:
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if (!schema_does_not_exist_skipping(castNode(List, object), &msg, &name))
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{
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msg = gettext_noop("text search template \"%s\" does not exist, skipping");
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name = NameListToString(castNode(List, object));
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}
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break;
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case OBJECT_TSCONFIGURATION:
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if (!schema_does_not_exist_skipping(castNode(List, object), &msg, &name))
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{
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msg = gettext_noop("text search configuration \"%s\" does not exist, skipping");
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name = NameListToString(castNode(List, object));
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}
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break;
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case OBJECT_EXTENSION:
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msg = gettext_noop("extension \"%s\" does not exist, skipping");
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name = strVal((Value *) object);
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break;
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case OBJECT_FUNCTION:
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{
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ObjectWithArgs *owa = castNode(ObjectWithArgs, object);
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if (!schema_does_not_exist_skipping(owa->objname, &msg, &name) &&
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!type_in_list_does_not_exist_skipping(owa->objargs, &msg, &name))
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{
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msg = gettext_noop("function %s(%s) does not exist, skipping");
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name = NameListToString(owa->objname);
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args = TypeNameListToString(owa->objargs);
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}
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break;
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}
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case OBJECT_PROCEDURE:
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{
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ObjectWithArgs *owa = castNode(ObjectWithArgs, object);
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if (!schema_does_not_exist_skipping(owa->objname, &msg, &name) &&
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!type_in_list_does_not_exist_skipping(owa->objargs, &msg, &name))
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{
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msg = gettext_noop("procedure %s(%s) does not exist, skipping");
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name = NameListToString(owa->objname);
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args = TypeNameListToString(owa->objargs);
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}
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break;
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}
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case OBJECT_ROUTINE:
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{
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ObjectWithArgs *owa = castNode(ObjectWithArgs, object);
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if (!schema_does_not_exist_skipping(owa->objname, &msg, &name) &&
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!type_in_list_does_not_exist_skipping(owa->objargs, &msg, &name))
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{
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msg = gettext_noop("routine %s(%s) does not exist, skipping");
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name = NameListToString(owa->objname);
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args = TypeNameListToString(owa->objargs);
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}
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break;
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}
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case OBJECT_AGGREGATE:
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{
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ObjectWithArgs *owa = castNode(ObjectWithArgs, object);
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if (!schema_does_not_exist_skipping(owa->objname, &msg, &name) &&
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!type_in_list_does_not_exist_skipping(owa->objargs, &msg, &name))
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{
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msg = gettext_noop("aggregate %s(%s) does not exist, skipping");
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name = NameListToString(owa->objname);
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args = TypeNameListToString(owa->objargs);
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}
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break;
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}
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case OBJECT_OPERATOR:
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{
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ObjectWithArgs *owa = castNode(ObjectWithArgs, object);
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if (!schema_does_not_exist_skipping(owa->objname, &msg, &name) &&
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!type_in_list_does_not_exist_skipping(owa->objargs, &msg, &name))
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{
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msg = gettext_noop("operator %s does not exist, skipping");
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name = NameListToString(owa->objname);
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}
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break;
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}
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case OBJECT_LANGUAGE:
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msg = gettext_noop("language \"%s\" does not exist, skipping");
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name = strVal((Value *) object);
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break;
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case OBJECT_CAST:
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{
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if (!type_in_list_does_not_exist_skipping(list_make1(linitial(castNode(List, object))), &msg, &name) &&
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!type_in_list_does_not_exist_skipping(list_make1(lsecond(castNode(List, object))), &msg, &name))
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{
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/* XXX quote or no quote? */
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msg = gettext_noop("cast from type %s to type %s does not exist, skipping");
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name = TypeNameToString(linitial_node(TypeName, castNode(List, object)));
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args = TypeNameToString(lsecond_node(TypeName, castNode(List, object)));
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}
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}
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break;
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case OBJECT_TRANSFORM:
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if (!type_in_list_does_not_exist_skipping(list_make1(linitial(castNode(List, object))), &msg, &name))
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{
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msg = gettext_noop("transform for type %s language \"%s\" does not exist, skipping");
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name = TypeNameToString(linitial_node(TypeName, castNode(List, object)));
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args = strVal(lsecond(castNode(List, object)));
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}
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break;
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case OBJECT_TRIGGER:
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if (!owningrel_does_not_exist_skipping(castNode(List, object), &msg, &name))
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{
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msg = gettext_noop("trigger \"%s\" for relation \"%s\" does not exist, skipping");
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name = strVal(llast(castNode(List, object)));
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args = NameListToString(list_truncate(list_copy(castNode(List, object)),
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list_length(castNode(List, object)) - 1));
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}
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break;
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case OBJECT_POLICY:
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if (!owningrel_does_not_exist_skipping(castNode(List, object), &msg, &name))
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{
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msg = gettext_noop("policy \"%s\" for relation \"%s\" does not exist, skipping");
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name = strVal(llast(castNode(List, object)));
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args = NameListToString(list_truncate(list_copy(castNode(List, object)),
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list_length(castNode(List, object)) - 1));
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}
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break;
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case OBJECT_EVENT_TRIGGER:
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msg = gettext_noop("event trigger \"%s\" does not exist, skipping");
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name = strVal((Value *) object);
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break;
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case OBJECT_RULE:
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if (!owningrel_does_not_exist_skipping(castNode(List, object), &msg, &name))
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{
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msg = gettext_noop("rule \"%s\" for relation \"%s\" does not exist, skipping");
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name = strVal(llast(castNode(List, object)));
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args = NameListToString(list_truncate(list_copy(castNode(List, object)),
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list_length(castNode(List, object)) - 1));
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}
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break;
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case OBJECT_FDW:
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msg = gettext_noop("foreign-data wrapper \"%s\" does not exist, skipping");
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name = strVal((Value *) object);
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break;
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case OBJECT_FOREIGN_SERVER:
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msg = gettext_noop("server \"%s\" does not exist, skipping");
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name = strVal((Value *) object);
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break;
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case OBJECT_OPCLASS:
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{
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List *opcname = list_copy_tail(castNode(List, object), 1);
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if (!schema_does_not_exist_skipping(opcname, &msg, &name))
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{
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msg = gettext_noop("operator class \"%s\" does not exist for access method \"%s\", skipping");
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name = NameListToString(opcname);
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args = strVal(linitial(castNode(List, object)));
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}
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}
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break;
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case OBJECT_OPFAMILY:
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{
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List *opfname = list_copy_tail(castNode(List, object), 1);
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if (!schema_does_not_exist_skipping(opfname, &msg, &name))
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{
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msg = gettext_noop("operator family \"%s\" does not exist for access method \"%s\", skipping");
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name = NameListToString(opfname);
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args = strVal(linitial(castNode(List, object)));
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}
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}
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break;
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case OBJECT_PUBLICATION:
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msg = gettext_noop("publication \"%s\" does not exist, skipping");
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name = strVal((Value *) object);
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break;
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default:
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elog(ERROR, "unrecognized object type: %d", (int) objtype);
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break;
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}
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if (!args)
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ereport(NOTICE, (errmsg(msg, name)));
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else
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ereport(NOTICE, (errmsg(msg, name, args)));
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}
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