_RETURN now, since there's no need to keep 'em unique anymore.
<!--
-$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_rule.sgml,v 1.34 2002/04/19 16:36:08 tgl Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_rule.sgml,v 1.35 2002/04/19 23:13:53 tgl Exp $
PostgreSQL documentation
-->
report an error because the query cycled too many times:
<programlisting>
-CREATE RULE "_RETemp" AS
+CREATE RULE "_RETURN" AS
ON SELECT TO emp
DO INSTEAD
SELECT * FROM toyemp;
-CREATE RULE "_RETtoyemp" AS
+CREATE RULE "_RETURN" AS
ON SELECT TO toyemp
DO INSTEAD
SELECT * FROM emp;
-<!-- $Header: /cvsroot/pgsql/doc/src/sgml/rules.sgml,v 1.22 2002/03/22 19:20:26 petere Exp $ -->
+<!-- $Header: /cvsroot/pgsql/doc/src/sgml/rules.sgml,v 1.23 2002/04/19 23:13:53 tgl Exp $ -->
<Chapter Id="rules">
<Title>The Rule System</Title>
<ProgramListing>
CREATE TABLE myview (<Replaceable>same attribute list as for mytab</Replaceable>);
-CREATE RULE "_RETmyview" AS ON SELECT TO myview DO INSTEAD
+CREATE RULE "_RETURN" AS ON SELECT TO myview DO INSTEAD
SELECT * FROM mytab;
</ProgramListing>
range table and checks if there are rules in <Filename>pg_rewrite</Filename>
for any relation. When processing the range table entry for
<Filename>shoelace</Filename> (the only one up to now) it finds the
- rule <literal>_RETshoelace</literal> with the parse tree
+ <literal>_RETURN</literal> rule with the parse tree
<ProgramListing>
<emphasis>SELECT s.sl_name, s.sl_avail,
Again it's an INSTEAD rule and the previous parse tree is trashed.
Note that this query still uses the view <Filename>shoelace</Filename>.
But the rule system isn't finished with this loop so it continues
- and applies the rule <literal>_RETshoelace</literal> on it and we get
+ and applies the <literal>_RETURN</literal> rule on it and we get
<ProgramListing>
UPDATE shoelace_data SET
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/commands/tablecmds.c,v 1.4 2002/04/19 16:36:08 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/commands/tablecmds.c,v 1.5 2002/04/19 23:13:54 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "parser/parse_expr.h"
#include "parser/parse_relation.h"
#include "parser/parse_type.h"
-#include "rewrite/rewriteDefine.h"
-#include "rewrite/rewriteSupport.h"
#include "utils/acl.h"
#include "utils/builtins.h"
#include "utils/fmgroids.h"
TypeRename(oldrelname, namespaceId, newrelname);
/*
- * If it's a view, must also rename the associated ON SELECT rule.
- */
- if (relkind == RELKIND_VIEW)
- {
- char *oldrulename,
- *newrulename;
-
- oldrulename = MakeRetrieveViewRuleName(oldrelname);
- newrulename = MakeRetrieveViewRuleName(newrelname);
- RenameRewriteRule(relid, oldrulename, newrulename);
- }
-
- /*
* Update rel name in any RI triggers associated with the relation.
*/
if (relhastriggers)
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $Id: view.c,v 1.62 2002/04/15 05:22:03 tgl Exp $
+ * $Id: view.c,v 1.63 2002/04/19 23:13:54 tgl Exp $
*
*-------------------------------------------------------------------------
*/
FormViewRetrieveRule(const RangeVar *view, Query *viewParse)
{
RuleStmt *rule;
- char *rname;
/*
* Create a RuleStmt that corresponds to the suitable rewrite rule
* args for DefineQueryRewrite();
*/
- rname = MakeRetrieveViewRuleName(view->relname);
-
rule = makeNode(RuleStmt);
rule->relation = copyObject((RangeVar *) view);
- rule->rulename = pstrdup(rname);
+ rule->rulename = pstrdup(ViewSelectRuleName);
rule->whereClause = NULL;
rule->event = CMD_SELECT;
rule->instead = true;
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteDefine.c,v 1.67 2002/04/18 20:01:09 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteDefine.c,v 1.68 2002/04/19 23:13:54 tgl Exp $
*
*-------------------------------------------------------------------------
*/
{
List *tllist;
int i;
- char *expected_name;
/*
* So there cannot be INSTEAD NOTHING, ...
}
/*
- * ... and finally the rule must be named _RETviewname.
+ * ... and finally the rule must be named _RETURN.
*/
- expected_name = MakeRetrieveViewRuleName(event_obj->relname);
- if (strcmp(expected_name, stmt->rulename) != 0)
+ if (strcmp(stmt->rulename, ViewSelectRuleName) != 0)
{
- elog(ERROR, "view rule for \"%s\" must be named \"%s\"",
- event_obj->relname, expected_name);
+ /*
+ * In versions before 7.3, the expected name was _RETviewname.
+ * For backwards compatibility with old pg_dump output, accept
+ * that and silently change it to _RETURN. Since this is just
+ * a quick backwards-compatibility hack, limit the number of
+ * characters checked to a few less than NAMEDATALEN; this
+ * saves having to worry about where a multibyte character might
+ * have gotten truncated.
+ */
+ if (strncmp(stmt->rulename, "_RET", 4) != 0 ||
+ strncmp(stmt->rulename + 4, event_obj->relname,
+ NAMEDATALEN - 4 - 4) != 0)
+ elog(ERROR, "view rule for \"%s\" must be named \"%s\"",
+ event_obj->relname, ViewSelectRuleName);
+ stmt->rulename = pstrdup(ViewSelectRuleName);
}
- pfree(expected_name);
/*
* Are we converting a relation to a view?
/*
* Rename an existing rewrite rule.
*
- * There is not currently a user command to invoke this directly
- * (perhaps there should be). But we need it anyway to rename the
- * ON SELECT rule associated with a view, when the view is renamed.
+ * This is unused code at the moment.
*/
void
RenameRewriteRule(Oid owningRel, const char *oldName,
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteSupport.c,v 1.50 2002/04/18 20:01:09 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteSupport.c,v 1.51 2002/04/19 23:13:54 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "rewrite/rewriteSupport.h"
#include "utils/syscache.h"
-#ifdef MULTIBYTE
-#include "mb/pg_wchar.h"
-#endif
-
/*
* Is there a rule by the given name?
0, 0);
}
-/*
- * makeViewRetrieveRuleName
- *
- * Given a view name, returns the name for the associated ON SELECT rule.
- *
- * XXX this is not the only place in the backend that knows about the _RET
- * name-forming convention.
- */
-char *
-MakeRetrieveViewRuleName(const char *viewName)
-{
- char *buf;
- int buflen,
- maxlen;
-
- buflen = strlen(viewName) + 5;
- buf = palloc(buflen);
- snprintf(buf, buflen, "_RET%s", viewName);
- /* clip to less than NAMEDATALEN bytes, if necessary */
-#ifdef MULTIBYTE
- maxlen = pg_mbcliplen(buf, strlen(buf), NAMEDATALEN - 1);
-#else
- maxlen = NAMEDATALEN - 1;
-#endif
- if (maxlen < buflen)
- buf[maxlen] = '\0';
-
- return buf;
-}
/*
* SetRelationRuleStatus
* back to source text
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/utils/adt/ruleutils.c,v 1.97 2002/04/18 20:01:09 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/utils/adt/ruleutils.c,v 1.98 2002/04/19 23:13:54 tgl Exp $
*
* This software is copyrighted by Jan Wieck - Hamburg.
*
StringInfoData buf;
int len;
char *viewname;
- char *name;
/*
* Connect to SPI manager
* Get the pg_rewrite tuple for the view's SELECT rule
*/
viewname = get_rel_name(viewoid);
- name = MakeRetrieveViewRuleName(viewname);
args[0] = ObjectIdGetDatum(viewoid);
- args[1] = PointerGetDatum(name);
+ args[1] = PointerGetDatum(ViewSelectRuleName);
nulls[0] = ' ';
nulls[1] = ' ';
spirc = SPI_execp(plan_getviewrule, args, nulls, 2);
VARATT_SIZEP(ruledef) = len;
memcpy(VARDATA(ruledef), buf.data, buf.len);
pfree(buf.data);
- pfree(name);
/*
* Disconnect from SPI manager
# Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
# Portions Copyright (c) 1994, Regents of the University of California
#
-# $Header: /cvsroot/pgsql/src/bin/initdb/Attic/initdb.sh,v 1.149 2002/04/18 20:01:10 tgl Exp $
+# $Header: /cvsroot/pgsql/src/bin/initdb/Attic/initdb.sh,v 1.150 2002/04/19 23:13:54 tgl Exp $
#
#-------------------------------------------------------------------------
pg_get_ruledef(R.oid) AS definition \
FROM (pg_rewrite R JOIN pg_class C ON (C.oid = R.ev_class)) \
LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace) \
- WHERE R.rulename !~ '^_RET';
+ WHERE R.rulename != '_RETURN';
CREATE VIEW pg_views AS \
SELECT \
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/bin/pg_dump/pg_dump.c,v 1.249 2002/04/18 20:01:10 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/bin/pg_dump/pg_dump.c,v 1.250 2002/04/19 23:13:54 tgl Exp $
*
*-------------------------------------------------------------------------
*/
"oid as view_oid"
" from pg_rewrite where"
" ev_class = '%s'::oid and"
- " rulename = ('_RET' || ",
+ " rulename = '_RETURN';",
tblinfo[i].oid);
- formatStringLiteral(query, tblinfo[i].relname, CONV_ALL);
- appendPQExpBuffer(query, ")::name;");
}
res2 = PQexec(g_conn, query->data);
continue;
/*
- * Get all rules defined for this table
+ * Get all rules defined for this table, except view select rules
*/
resetPQExpBuffer(query);
"FROM pg_rewrite, pg_class "
"WHERE pg_class.oid = '%s'::oid "
" AND pg_rewrite.ev_class = pg_class.oid "
- " AND pg_rewrite.rulename !~ '^_RET' "
+ " AND pg_rewrite.rulename != '_RETURN' "
"ORDER BY pg_rewrite.oid",
tblinfo[t].oid);
}
*
* Copyright 2000 by PostgreSQL Global Development Group
*
- * $Header: /cvsroot/pgsql/src/bin/psql/describe.c,v 1.49 2002/04/11 20:00:08 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/bin/psql/describe.c,v 1.50 2002/04/19 23:13:54 tgl Exp $
*/
#include "postgres_fe.h"
#include "describe.h"
/* Rule description (ignore rules for views) */
"UNION ALL\n"
" SELECT r.oid as oid, r.tableoid as tableoid,\n"
- " CAST(r.rulename AS text) as name, CAST('%s' AS text) as object\n"
+ " CAST(r.rulename AS text) as name, CAST('%s' AS text) as object\n"
" FROM pg_rewrite r\n"
- " WHERE r.rulename !~ '^_RET'\n"
+ " WHERE r.rulename != '_RETURN'\n"
/* Trigger description */
"UNION ALL\n"
sprintf(buf,
"SELECT r.rulename\n"
"FROM pg_rewrite r, pg_class c\n"
- "WHERE c.relname='%s' AND c.oid = r.ev_class\n"
- "AND r.rulename NOT LIKE '_RET%%'",
+ "WHERE c.relname = '%s' AND c.oid = r.ev_class\n"
+ "AND r.rulename != '_RETURN'",
name);
result = PSQLexec(buf);
if (!result)
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $Id: catversion.h,v 1.119 2002/04/19 16:36:08 tgl Exp $
+ * $Id: catversion.h,v 1.120 2002/04/19 23:13:54 tgl Exp $
*
*-------------------------------------------------------------------------
*/
*/
/* yyyymmddN */
-#define CATALOG_VERSION_NO 200204182
+#define CATALOG_VERSION_NO 200204191
#endif
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $Id: rewriteSupport.h,v 1.21 2002/04/18 20:01:11 tgl Exp $
+ * $Id: rewriteSupport.h,v 1.22 2002/04/19 23:13:54 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef REWRITESUPPORT_H
#define REWRITESUPPORT_H
-extern bool IsDefinedRewriteRule(Oid owningRel, const char *ruleName);
+/* The ON SELECT rule of a view is always named this: */
+#define ViewSelectRuleName "_RETURN"
-extern char *MakeRetrieveViewRuleName(const char *view_name);
+extern bool IsDefinedRewriteRule(Oid owningRel, const char *ruleName);
extern void SetRelationRuleStatus(Oid relationId, bool relHasRules,
bool relIsBecomingView);
--------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
iexit | SELECT ih.name, ih.thepath, interpt_pp(ih.thepath, r.thepath) AS exit FROM ihighway ih, ramp r WHERE (ih.thepath ## r.thepath);
pg_indexes | SELECT c.relname AS tablename, i.relname AS indexname, pg_get_indexdef(x.indexrelid) AS indexdef FROM pg_index x, pg_class c, pg_class i WHERE ((((c.relkind = 'r'::"char") AND (i.relkind = 'i'::"char")) AND (c.oid = x.indrelid)) AND (i.oid = x.indexrelid));
- pg_rules | SELECT n.nspname AS schemaname, c.relname AS tablename, r.rulename, pg_get_ruledef(r.oid) AS definition FROM ((pg_rewrite r JOIN pg_class c ON ((c.oid = r.ev_class))) LEFT JOIN pg_namespace n ON ((n.oid = c.relnamespace))) WHERE (r.rulename !~ '^_RET'::text);
+ pg_rules | SELECT n.nspname AS schemaname, c.relname AS tablename, r.rulename, pg_get_ruledef(r.oid) AS definition FROM ((pg_rewrite r JOIN pg_class c ON ((c.oid = r.ev_class))) LEFT JOIN pg_namespace n ON ((n.oid = c.relnamespace))) WHERE (r.rulename <> '_RETURN'::name);
pg_stat_activity | SELECT d.oid AS datid, d.datname, pg_stat_get_backend_pid(s.backendid) AS procpid, pg_stat_get_backend_userid(s.backendid) AS usesysid, u.usename, pg_stat_get_backend_activity(s.backendid) AS current_query FROM pg_database d, (SELECT pg_stat_get_backend_idset() AS backendid) s, pg_shadow u WHERE ((pg_stat_get_backend_dbid(s.backendid) = d.oid) AND (pg_stat_get_backend_userid(s.backendid) = u.usesysid));
pg_stat_all_indexes | SELECT c.oid AS relid, i.oid AS indexrelid, c.relname, i.relname AS indexrelname, pg_stat_get_numscans(i.oid) AS idx_scan, pg_stat_get_tuples_returned(i.oid) AS idx_tup_read, pg_stat_get_tuples_fetched(i.oid) AS idx_tup_fetch FROM pg_class c, pg_class i, pg_index x WHERE (((c.relkind = 'r'::"char") AND (x.indrelid = c.oid)) AND (x.indexrelid = i.oid));
pg_stat_all_tables | SELECT c.oid AS relid, c.relname, pg_stat_get_numscans(c.oid) AS seq_scan, pg_stat_get_tuples_returned(c.oid) AS seq_tup_read, sum(pg_stat_get_numscans(i.indexrelid)) AS idx_scan, sum(pg_stat_get_tuples_fetched(i.indexrelid)) AS idx_tup_fetch, pg_stat_get_tuples_inserted(c.oid) AS n_tup_ins, pg_stat_get_tuples_updated(c.oid) AS n_tup_upd, pg_stat_get_tuples_deleted(c.oid) AS n_tup_del FROM (pg_class c LEFT JOIN pg_index i ON ((c.oid = i.indrelid))) WHERE (c.relkind = 'r'::"char") GROUP BY c.oid, c.relname;
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