mirror of https://github.com/postgres/postgres
This gets rid of a significant amount of duplicative code. KaiGai Kohei, reviewed in earlier versions by Dimitri Fontaine, with further review and cleanup by me.pull/1/head
Robert Haas
14 years ago
parent
3301c83536
commit
82a4a777d9
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/*-------------------------------------------------------------------------
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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) 1996-2011, 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/catalog/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/heapam.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 "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/acl.h" |
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static void does_not_exist_skipping(ObjectType objtype, List *objname); |
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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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List *objname = 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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objname, NIL, |
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&relation, |
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AccessExclusiveLock, |
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stmt->missing_ok); |
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/* Issue NOTICE if supplied object was not found. */ |
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if (!OidIsValid(address.objectId)) |
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{ |
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does_not_exist_skipping(stmt->removeType, objname); |
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continue; |
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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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objname, NIL, relation); |
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/* Release any relcache reference count, but keep lock until commit. */ |
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if (relation) |
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heap_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); |
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free_object_addresses(objects); |
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} |
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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() will throw an ERROR. |
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*/ |
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static void |
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does_not_exist_skipping(ObjectType objtype, List *objname) |
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{ |
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const char *msg = NULL; |
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char *name = NULL; |
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switch (objtype) |
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{ |
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case OBJECT_TYPE: |
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case OBJECT_DOMAIN: |
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msg = gettext_noop("type \"%s\" does not exist, skipping"); |
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name = TypeNameToString(makeTypeNameFromNameList(objname)); |
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break; |
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case OBJECT_COLLATION: |
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msg = gettext_noop("collation \"%s\" does not exist, skipping"); |
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name = NameListToString(objname); |
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break; |
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case OBJECT_CONVERSION: |
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msg = gettext_noop("conversion \"%s\" does not exist, skipping"); |
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name = NameListToString(objname); |
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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 = NameListToString(objname); |
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break; |
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case OBJECT_TSPARSER: |
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msg = gettext_noop("text search parser \"%s\" does not exist, skipping"); |
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name = NameListToString(objname); |
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break; |
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case OBJECT_TSDICTIONARY: |
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msg = gettext_noop("text search dictionary \"%s\" does not exist, skipping"); |
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name = NameListToString(objname); |
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break; |
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case OBJECT_TSTEMPLATE: |
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msg = gettext_noop("text search template \"%s\" does not exist, skipping"); |
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name = NameListToString(objname); |
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break; |
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case OBJECT_TSCONFIGURATION: |
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msg = gettext_noop("text search configuration \"%s\" does not exist, skipping"); |
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name = NameListToString(objname); |
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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 = NameListToString(objname); |
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break; |
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default: |
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elog(ERROR, "unexpected object type (%d)", (int)objtype); |
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break; |
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} |
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ereport(NOTICE, (errmsg(msg, name))); |
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} |
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