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/*-------------------------------------------------------------------------
*
* collationcmds.c
* collation-related commands support code
*
* Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/backend/commands/collationcmds.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/heapam.h"
#include "access/htup_details.h"
#include "access/xact.h"
#include "catalog/dependency.h"
#include "catalog/indexing.h"
#include "catalog/namespace.h"
#include "catalog/pg_collation.h"
#include "catalog/pg_collation_fn.h"
#include "commands/alter.h"
#include "commands/collationcmds.h"
#include "commands/dbcommands.h"
#include "commands/defrem.h"
#include "mb/pg_wchar.h"
#include "miscadmin.h"
#include "utils/builtins.h"
#include "utils/lsyscache.h"
#include "utils/pg_locale.h"
#include "utils/rel.h"
#include "utils/syscache.h"
/*
* CREATE COLLATION
*/
Oid
DefineCollation(List *names, List *parameters)
{
char *collName;
Oid collNamespace;
AclResult aclresult;
ListCell *pl;
DefElem *fromEl = NULL;
DefElem *localeEl = NULL;
DefElem *lccollateEl = NULL;
DefElem *lcctypeEl = NULL;
char *collcollate = NULL;
char *collctype = NULL;
Oid newoid;
collNamespace = QualifiedNameGetCreationNamespace(names, &collName);
aclresult = pg_namespace_aclcheck(collNamespace, GetUserId(), ACL_CREATE);
if (aclresult != ACLCHECK_OK)
aclcheck_error(aclresult, ACL_KIND_NAMESPACE,
get_namespace_name(collNamespace));
foreach(pl, parameters)
{
DefElem *defel = (DefElem *) lfirst(pl);
DefElem **defelp;
if (pg_strcasecmp(defel->defname, "from") == 0)
defelp = &fromEl;
else if (pg_strcasecmp(defel->defname, "locale") == 0)
defelp = &localeEl;
else if (pg_strcasecmp(defel->defname, "lc_collate") == 0)
defelp = &lccollateEl;
else if (pg_strcasecmp(defel->defname, "lc_ctype") == 0)
defelp = &lcctypeEl;
else
{
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("collation attribute \"%s\" not recognized",
defel->defname)));
break;
}
*defelp = defel;
}
if ((localeEl && (lccollateEl || lcctypeEl))
|| (fromEl && list_length(parameters) != 1))
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting or redundant options")));
if (fromEl)
{
Oid collid;
HeapTuple tp;
collid = get_collation_oid(defGetQualifiedName(fromEl), false);
tp = SearchSysCache1(COLLOID, ObjectIdGetDatum(collid));
if (!HeapTupleIsValid(tp))
elog(ERROR, "cache lookup failed for collation %u", collid);
collcollate = pstrdup(NameStr(((Form_pg_collation) GETSTRUCT(tp))->collcollate));
collctype = pstrdup(NameStr(((Form_pg_collation) GETSTRUCT(tp))->collctype));
ReleaseSysCache(tp);
}
if (localeEl)
{
collcollate = defGetString(localeEl);
collctype = defGetString(localeEl);
}
if (lccollateEl)
collcollate = defGetString(lccollateEl);
if (lcctypeEl)
collctype = defGetString(lcctypeEl);
if (!collcollate)
ereport(ERROR,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("parameter \"lc_collate\" must be specified")));
if (!collctype)
ereport(ERROR,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("parameter \"lc_ctype\" must be specified")));
check_encoding_locale_matches(GetDatabaseEncoding(), collcollate, collctype);
newoid = CollationCreate(collName,
collNamespace,
GetUserId(),
GetDatabaseEncoding(),
collcollate,
collctype);
/* check that the locales can be loaded */
CommandCounterIncrement();
(void) pg_newlocale_from_collation(newoid);
return newoid;
}
/*
* Rename collation
*/
Oid
RenameCollation(List *name, const char *newname)
{
Oid collationOid;
Oid namespaceOid;
HeapTuple tup;
Relation rel;
AclResult aclresult;
rel = heap_open(CollationRelationId, RowExclusiveLock);
collationOid = get_collation_oid(name, false);
tup = SearchSysCacheCopy1(COLLOID, ObjectIdGetDatum(collationOid));
if (!HeapTupleIsValid(tup)) /* should not happen */
elog(ERROR, "cache lookup failed for collation %u", collationOid);
namespaceOid = ((Form_pg_collation) GETSTRUCT(tup))->collnamespace;
/* make sure the new name doesn't exist */
IsThereCollationInNamespace(newname, namespaceOid);
/* must be owner */
if (!pg_collation_ownercheck(collationOid, GetUserId()))
aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_COLLATION,
NameListToString(name));
/* must have CREATE privilege on namespace */
aclresult = pg_namespace_aclcheck(namespaceOid, GetUserId(), ACL_CREATE);
if (aclresult != ACLCHECK_OK)
aclcheck_error(aclresult, ACL_KIND_NAMESPACE,
get_namespace_name(namespaceOid));
/* rename */
namestrcpy(&(((Form_pg_collation) GETSTRUCT(tup))->collname), newname);
simple_heap_update(rel, &tup->t_self, tup);
CatalogUpdateIndexes(rel, tup);
heap_freetuple(tup);
heap_close(rel, RowExclusiveLock);
return collationOid;
}
/*
* Subroutine for ALTER COLLATION SET SCHEMA and RENAME
*
* Is there a collation with the same name of the given collation already in
* the given namespace? If so, raise an appropriate error message.
*/
void
IsThereCollationInNamespace(const char *collname, Oid nspOid)
{
/* make sure the name doesn't already exist in new schema */
if (SearchSysCacheExists3(COLLNAMEENCNSP,
CStringGetDatum(collname),
Int32GetDatum(GetDatabaseEncoding()),
ObjectIdGetDatum(nspOid)))
ereport(ERROR,
(errcode(ERRCODE_DUPLICATE_OBJECT),
errmsg("collation \"%s\" for encoding \"%s\" already exists in schema \"%s\"",
collname, GetDatabaseEncodingName(),
get_namespace_name(nspOid))));
/* mustn't match an any-encoding entry, either */
if (SearchSysCacheExists3(COLLNAMEENCNSP,
CStringGetDatum(collname),
Int32GetDatum(-1),
ObjectIdGetDatum(nspOid)))
ereport(ERROR,
(errcode(ERRCODE_DUPLICATE_OBJECT),
errmsg("collation \"%s\" already exists in schema \"%s\"",
collname, get_namespace_name(nspOid))));
}
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