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Postgres95 1.01 Distribution - Virgin Sources
This commit is contained in:
Marc G. Fournier
275
src/backend/commands/rename.c
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275
src/backend/commands/rename.c
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/*-------------------------------------------------------------------------
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*
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* rename.c--
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* renameatt() and renamerel() reside here.
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*
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* 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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* $Header: /cvsroot/pgsql/src/backend/commands/Attic/rename.c,v 1.1.1.1 1996/07/09 06:21:22 scrappy Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#include <string.h>
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#include "postgres.h"
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#include "nodes/pg_list.h"
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#include "access/attnum.h"
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#include "access/heapam.h"
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#include "access/htup.h"
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#include "access/relscan.h"
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#include "access/skey.h"
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#include "utils/builtins.h"
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#include "utils/tqual.h"
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#include "catalog/catname.h"
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#include "utils/syscache.h"
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#include "catalog/indexing.h"
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#include "catalog/catalog.h"
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#include "commands/copy.h"
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#include "executor/execdefs.h" /* for EXEC_{FOR,BACK,FDEBUG,BDEBUG} */
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#include "storage/buf.h"
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#include "storage/itemptr.h"
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#include "miscadmin.h"
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#include "utils/portal.h"
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#include "tcop/dest.h"
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#include "commands/command.h"
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#include "utils/excid.h"
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#include "utils/elog.h"
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#include "utils/mcxt.h"
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#include "utils/palloc.h"
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#include "utils/rel.h"
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#include "catalog/pg_attribute.h"
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#include "catalog/pg_proc.h"
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#include "catalog/pg_class.h"
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#include "optimizer/internal.h"
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#include "optimizer/prep.h" /* for find_all_inheritors */
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#ifndef NO_SECURITY
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#include "utils/acl.h"
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#include "utils/syscache.h"
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#endif /* !NO_SECURITY */
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/*
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* renameatt - changes the name of a attribute in a relation
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*
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* Attname attribute is changed in attribute catalog.
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* No record of the previous attname is kept (correct?).
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*
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* get proper reldesc from relation catalog (if not arg)
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* scan attribute catalog
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* for name conflict (within rel)
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* for original attribute (if not arg)
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* modify attname in attribute tuple
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* insert modified attribute in attribute catalog
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* delete original attribute from attribute catalog
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*
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* XXX Renaming an indexed attribute must (eventually) also change
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* the attribute name in the associated indexes.
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*/
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void
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renameatt(char *relname,
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char *oldattname,
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char *newattname,
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char *userName,
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int recurse)
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{
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Relation relrdesc, attrdesc;
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HeapTuple reltup, oldatttup, newatttup;
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ItemPointerData oldTID;
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Relation idescs[Num_pg_attr_indices];
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/*
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* permissions checking. this would normally be done in utility.c,
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* but this particular routine is recursive.
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*
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* normally, only the owner of a class can change its schema.
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*/
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if (IsSystemRelationName(relname))
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elog(WARN, "renameatt: class \"%-.*s\" is a system catalog",
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NAMEDATALEN, relname);
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#ifndef NO_SECURITY
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if (!IsBootstrapProcessingMode() &&
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!pg_ownercheck(userName, relname, RELNAME))
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elog(WARN, "renameatt: you do not own class \"%-.*s\"",
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NAMEDATALEN, relname);
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#endif
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/*
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* if the 'recurse' flag is set then we are supposed to rename this
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* attribute in all classes that inherit from 'relname' (as well as
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* in 'relname').
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*
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* any permissions or problems with duplicate attributes will cause
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* the whole transaction to abort, which is what we want -- all or
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* nothing.
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*/
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if (recurse) {
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Oid myrelid, childrelid;
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List *child, *children;
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relrdesc = heap_openr(relname);
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if (!RelationIsValid(relrdesc)) {
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elog(WARN, "renameatt: unknown relation: \"%-.*s\"",
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NAMEDATALEN, relname);
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}
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myrelid = relrdesc->rd_id;
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heap_close(relrdesc);
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/* this routine is actually in the planner */
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children = find_all_inheritors(lconsi(myrelid, NIL), NIL);
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/*
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* find_all_inheritors does the recursive search of the
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* inheritance hierarchy, so all we have to do is process
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* all of the relids in the list that it returns.
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*/
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foreach (child, children) {
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char *childname;
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childrelid = lfirsti(child);
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if (childrelid == myrelid)
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continue;
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relrdesc = heap_open(childrelid);
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if (!RelationIsValid(relrdesc)) {
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elog(WARN, "renameatt: can't find catalog entry for inheriting class with oid %d",
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childrelid);
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}
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childname = (relrdesc->rd_rel->relname).data;
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heap_close(relrdesc);
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renameatt(childname, oldattname, newattname,
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userName, 0); /* no more recursion! */
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}
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}
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relrdesc = heap_openr(RelationRelationName);
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reltup = ClassNameIndexScan(relrdesc, relname);
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if (!PointerIsValid(reltup)) {
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heap_close(relrdesc);
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elog(WARN, "renameatt: relation \"%-.*s\" nonexistent",
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NAMEDATALEN, relname);
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return;
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}
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heap_close(relrdesc);
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attrdesc = heap_openr(AttributeRelationName);
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oldatttup = AttributeNameIndexScan(attrdesc, reltup->t_oid, oldattname);
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if (!PointerIsValid(oldatttup)) {
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heap_close(attrdesc);
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elog(WARN, "renameatt: attribute \"%-.*s\" nonexistent",
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NAMEDATALEN, oldattname);
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}
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if (((AttributeTupleForm ) GETSTRUCT(oldatttup))->attnum < 0) {
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elog(WARN, "renameatt: system attribute \"%-.*s\" not renamed",
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NAMEDATALEN, oldattname);
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}
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newatttup = AttributeNameIndexScan(attrdesc, reltup->t_oid, newattname);
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if (PointerIsValid(newatttup)) {
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pfree(oldatttup);
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heap_close(attrdesc);
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elog(WARN, "renameatt: attribute \"%-.*s\" exists",
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NAMEDATALEN, newattname);
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}
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namestrcpy(&(((AttributeTupleForm)(GETSTRUCT(oldatttup)))->attname),
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newattname);
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oldTID = oldatttup->t_ctid;
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/* insert "fixed" tuple */
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(void) heap_replace(attrdesc, &oldTID, oldatttup);
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/* keep system catalog indices current */
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CatalogOpenIndices(Num_pg_attr_indices, Name_pg_attr_indices, idescs);
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CatalogIndexInsert(idescs, Num_pg_attr_indices, attrdesc, oldatttup);
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CatalogCloseIndices(Num_pg_attr_indices, idescs);
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heap_close(attrdesc);
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pfree(oldatttup);
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}
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/*
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* renamerel - change the name of a relation
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*
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* Relname attribute is changed in relation catalog.
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* No record of the previous relname is kept (correct?).
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*
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* scan relation catalog
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* for name conflict
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* for original relation (if not arg)
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* modify relname in relation tuple
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* insert modified relation in relation catalog
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* delete original relation from relation catalog
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*
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* XXX Will currently lose track of a relation if it is unable to
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* properly replace the new relation tuple.
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*/
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void
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renamerel(char oldrelname[], char newrelname[])
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{
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Relation relrdesc; /* for RELATION relation */
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HeapTuple oldreltup, newreltup;
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ItemPointerData oldTID;
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char oldpath[MAXPGPATH], newpath[MAXPGPATH];
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Relation idescs[Num_pg_class_indices];
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if (IsSystemRelationName(oldrelname)) {
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elog(WARN, "renamerel: system relation \"%-.*s\" not renamed",
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NAMEDATALEN, oldrelname);
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return;
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}
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if (IsSystemRelationName(newrelname)) {
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elog(WARN, "renamerel: Illegal class name: \"%-.*s\" -- pg_ is reserved for system catalogs",
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NAMEDATALEN, newrelname);
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return;
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}
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relrdesc = heap_openr(RelationRelationName);
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oldreltup = ClassNameIndexScan(relrdesc, oldrelname);
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if (!PointerIsValid(oldreltup)) {
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heap_close(relrdesc);
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elog(WARN, "renamerel: relation \"%-.*s\" does not exist",
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NAMEDATALEN, oldrelname);
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}
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newreltup = ClassNameIndexScan(relrdesc, newrelname);
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if (PointerIsValid(newreltup)) {
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pfree(oldreltup);
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heap_close(relrdesc);
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elog(WARN, "renamerel: relation \"%-.*s\" exists",
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NAMEDATALEN, newrelname);
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}
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/* rename the directory first, so if this fails the rename's not done */
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(void) strcpy(oldpath, relpath(oldrelname));
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(void) strcpy(newpath, relpath(newrelname));
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if (rename(oldpath, newpath) < 0)
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elog(WARN, "renamerel: unable to rename file: %m");
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memmove((char *) (((Form_pg_class) GETSTRUCT(oldreltup))->relname.data),
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newrelname,
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NAMEDATALEN);
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oldTID = oldreltup->t_ctid;
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/* insert fixed rel tuple */
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(void) heap_replace(relrdesc, &oldTID, oldreltup);
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/* keep the system catalog indices current */
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CatalogOpenIndices(Num_pg_class_indices, Name_pg_class_indices, idescs);
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CatalogIndexInsert(idescs, Num_pg_class_indices, relrdesc, oldreltup);
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CatalogCloseIndices(Num_pg_class_indices, idescs);
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pfree(oldreltup);
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heap_close(relrdesc);
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}
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