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Tweak FOR UPDATE/SHARE error message wording (again)

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In commit 0ac5ad5134 I changed some error messages from "FOR
UPDATE/SHARE" to a rather long gobbledygook which nobody liked.  Then,
in commit cb9b66d31 I changed them again, but the alternative chosen
there was deemed suboptimal by Peter Eisentraut, who in message
1373937980.20441.8.camel@vanquo.pezone.net proposed an alternative
involving a dynamically-constructed string based on the actual locking
strength specified in the SQL command.  This patch implements that
suggestion.
This commit is contained in:
Alvaro Herrera 2013-07-23 14:03:09 -04:00
parent 765ad89be3
commit c359a1b082
4 changed files with 118 additions and 22 deletions
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6
src/backend/optimizer/plan/initsplan.c
View File

@ -26,6 +26,7 @@
#include "optimizer/prep.h"
#include "optimizer/restrictinfo.h"
#include "optimizer/var.h"
#include "parser/analyze.h"
#include "rewrite/rewriteManip.h"
#include "utils/lsyscache.h"
@ -883,7 +884,10 @@ make_outerjoininfo(PlannerInfo *root,
(jointype == JOIN_FULL && bms_is_member(rc->rti, left_rels)))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("row-level locks cannot be applied to the nullable side of an outer join")));
/*------
translator: %s is a SQL row locking clause such as FOR UPDATE */
errmsg("%s cannot be applied to the nullable side of an outer join",
LCS_asString(rc->strength))));
}
sjinfo->syn_lefthand = left_rels;

6
src/backend/optimizer/plan/planner.c
View File

@ -1107,7 +1107,11 @@ grouping_planner(PlannerInfo *root, double tuple_fraction)
if (parse->rowMarks)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("row-level locks are not allowed with UNION/INTERSECT/EXCEPT")));
/*------
translator: %s is a SQL row locking clause such as FOR UPDATE */
errmsg("%s is not allowed with UNION/INTERSECT/EXCEPT",
LCS_asString(((RowMarkClause *)
linitial(parse->rowMarks))->strength))));
/*
* Calculate pathkeys that represent result ordering requirements

127
src/backend/parser/analyze.c
View File

@ -1221,7 +1221,11 @@ transformValuesClause(ParseState *pstate, SelectStmt *stmt)
if (stmt->lockingClause)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("SELECT FOR UPDATE/SHARE cannot be applied to VALUES")));
/*------
translator: %s is a SQL row locking clause such as FOR UPDATE */
errmsg("%s cannot be applied to VALUES",
LCS_asString(((LockingClause *)
linitial(stmt->lockingClause))->strength))));
qry->rtable = pstate->p_rtable;
qry->jointree = makeFromExpr(pstate->p_joinlist, NULL);
@ -1312,7 +1316,11 @@ transformSetOperationStmt(ParseState *pstate, SelectStmt *stmt)
if (lockingClause)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("SELECT FOR UPDATE/SHARE is not allowed with UNION/INTERSECT/EXCEPT")));
/*------
translator: %s is a SQL row locking clause such as FOR UPDATE */
errmsg("%s is not allowed with UNION/INTERSECT/EXCEPT",
LCS_asString(((LockingClause *)
linitial(lockingClause))->strength))));
/* Process the WITH clause independently of all else */
if (withClause)
@ -1506,7 +1514,11 @@ transformSetOperationTree(ParseState *pstate, SelectStmt *stmt,
if (stmt->lockingClause)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("SELECT FOR UPDATE/SHARE is not allowed with UNION/INTERSECT/EXCEPT")));
/*------
translator: %s is a SQL row locking clause such as FOR UPDATE */
errmsg("%s is not allowed with UNION/INTERSECT/EXCEPT",
LCS_asString(((LockingClause *)
linitial(stmt->lockingClause))->strength))));
/*
* If an internal node of a set-op tree has ORDER BY, LIMIT, FOR UPDATE,
@ -2063,21 +2075,33 @@ transformDeclareCursorStmt(ParseState *pstate, DeclareCursorStmt *stmt)
if (result->rowMarks != NIL && (stmt->options & CURSOR_OPT_HOLD))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("DECLARE CURSOR WITH HOLD ... FOR UPDATE/SHARE is not supported"),
/*------
translator: %s is a SQL row locking clause such as FOR UPDATE */
errmsg("DECLARE CURSOR WITH HOLD ... %s is not supported",
LCS_asString(((RowMarkClause *)
linitial(result->rowMarks))->strength)),
errdetail("Holdable cursors must be READ ONLY.")));
/* FOR UPDATE and SCROLL are not compatible */
if (result->rowMarks != NIL && (stmt->options & CURSOR_OPT_SCROLL))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("DECLARE SCROLL CURSOR ... FOR UPDATE/SHARE is not supported"),
/*------
translator: %s is a SQL row locking clause such as FOR UPDATE */
errmsg("DECLARE SCROLL CURSOR ... %s is not supported",
LCS_asString(((RowMarkClause *)
linitial(result->rowMarks))->strength)),
errdetail("Scrollable cursors must be READ ONLY.")));
/* FOR UPDATE and INSENSITIVE are not compatible */
if (result->rowMarks != NIL && (stmt->options & CURSOR_OPT_INSENSITIVE))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("DECLARE INSENSITIVE CURSOR ... FOR UPDATE/SHARE is not supported"),
/*------
translator: %s is a SQL row locking clause such as FOR UPDATE */
errmsg("DECLARE INSENSITIVE CURSOR ... %s is not supported",
LCS_asString(((RowMarkClause *)
linitial(result->rowMarks))->strength)),
errdetail("Insensitive cursors must be READ ONLY.")));
/* We won't need the raw querytree any more */
@ -2196,6 +2220,23 @@ transformCreateTableAsStmt(ParseState *pstate, CreateTableAsStmt *stmt)
}
char *
LCS_asString(LockClauseStrength strength)
{
switch (strength)
{
case LCS_FORKEYSHARE:
return "FOR KEY SHARE";
case LCS_FORSHARE:
return "FOR SHARE";
case LCS_FORNOKEYUPDATE:
return "FOR NO KEY UPDATE";
case LCS_FORUPDATE:
return "FOR UPDATE";
}
return "FOR some"; /* shouldn't happen */
}
/*
* Check for features that are not supported with FOR [KEY] UPDATE/SHARE.
*
@ -2207,31 +2248,59 @@ CheckSelectLocking(Query *qry)
if (qry->setOperations)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("row-level locks are not allowed with UNION/INTERSECT/EXCEPT")));
/*------
translator: %s is a SQL row locking clause such as FOR UPDATE */
errmsg("%s is not allowed with UNION/INTERSECT/EXCEPT",
LCS_asString(((RowMarkClause *)
linitial(qry->rowMarks))->strength))));
if (qry->distinctClause != NIL)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("row-level locks are not allowed with DISTINCT clause")));
/*------
translator: %s is a SQL row locking clause such as FOR UPDATE */
errmsg("%s is not allowed with DISTINCT clause",
LCS_asString(((RowMarkClause *)
linitial(qry->rowMarks))->strength))));
if (qry->groupClause != NIL)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("row-level locks are not allowed with GROUP BY clause")));
/*------
translator: %s is a SQL row locking clause such as FOR UPDATE */
errmsg("%s is not allowed with GROUP BY clause",
LCS_asString(((RowMarkClause *)
linitial(qry->rowMarks))->strength))));
if (qry->havingQual != NULL)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("row-level locks are not allowed with HAVING clause")));
/*------
translator: %s is a SQL row locking clause such as FOR UPDATE */
errmsg("%s is not allowed with HAVING clause",
LCS_asString(((RowMarkClause *)
linitial(qry->rowMarks))->strength))));
if (qry->hasAggs)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("row-level locks are not allowed with aggregate functions")));
/*------
translator: %s is a SQL row locking clause such as FOR UPDATE */
errmsg("%s is not allowed with aggregate functions",
LCS_asString(((RowMarkClause *)
linitial(qry->rowMarks))->strength))));
if (qry->hasWindowFuncs)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("row-level locks are not allowed with window functions")));
/*------
translator: %s is a SQL row locking clause such as FOR UPDATE */
errmsg("%s is not allowed with window functions",
LCS_asString(((RowMarkClause *)
linitial(qry->rowMarks))->strength))));
if (expression_returns_set((Node *) qry->targetList))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("row-level locks are not allowed with set-returning functions in the target list")));
/*------
translator: %s is a SQL row locking clause such as FOR UPDATE */
errmsg("%s is not allowed with set-returning functions in the target list",
LCS_asString(((RowMarkClause *)
linitial(qry->rowMarks))->strength))));
}
/*
@ -2307,7 +2376,10 @@ transformLockingClause(ParseState *pstate, Query *qry, LockingClause *lc,
if (thisrel->catalogname || thisrel->schemaname)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("row-level locks must specify unqualified relation names"),
/*------
translator: %s is a SQL row locking clause such as FOR UPDATE */
errmsg("%s must specify unqualified relation names",
LCS_asString(lc->strength)),
parser_errposition(pstate, thisrel->location)));
i = 0;
@ -2337,25 +2409,37 @@ transformLockingClause(ParseState *pstate, Query *qry, LockingClause *lc,
case RTE_JOIN:
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("row-level locks cannot be applied to a join"),
/*------
translator: %s is a SQL row locking clause such as FOR UPDATE */
errmsg("%s cannot be applied to a join",
LCS_asString(lc->strength)),
parser_errposition(pstate, thisrel->location)));
break;
case RTE_FUNCTION:
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("row-level locks cannot be applied to a function"),
/*------
translator: %s is a SQL row locking clause such as FOR UPDATE */
errmsg("%s cannot be applied to a function",
LCS_asString(lc->strength)),
parser_errposition(pstate, thisrel->location)));
break;
case RTE_VALUES:
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("row-level locks cannot be applied to VALUES"),
/*------
translator: %s is a SQL row locking clause such as FOR UPDATE */
errmsg("%s cannot be applied to VALUES",
LCS_asString(lc->strength)),
parser_errposition(pstate, thisrel->location)));
break;
case RTE_CTE:
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("row-level locks cannot be applied to a WITH query"),
/*------
translator: %s is a SQL row locking clause such as FOR UPDATE */
errmsg("%s cannot be applied to a WITH query",
LCS_asString(lc->strength)),
parser_errposition(pstate, thisrel->location)));
break;
default:
@ -2369,8 +2453,11 @@ transformLockingClause(ParseState *pstate, Query *qry, LockingClause *lc,
if (rt == NULL)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_TABLE),
errmsg("relation \"%s\" in row-level lock clause not found in FROM clause",
thisrel->relname),
/*------
translator: %s is a SQL row locking clause such as FOR UPDATE */
errmsg("relation \"%s\" in %s clause not found in FROM clause",
thisrel->relname,
LCS_asString(lc->strength)),
parser_errposition(pstate, thisrel->location)));
}
}

1
src/include/parser/analyze.h
View File

@ -36,6 +36,7 @@ extern Query *transformStmt(ParseState *pstate, Node *parseTree);
extern bool analyze_requires_snapshot(Node *parseTree);
extern char *LCS_asString(LockClauseStrength strength);
extern void CheckSelectLocking(Query *qry);
extern void applyLockingClause(Query *qry, Index rtindex,
LockClauseStrength strength, bool noWait, bool pushedDown);