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Allow USING and INTO clauses of plpgsql's EXECUTE to appear in either order.

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Aside from being more forgiving, this prevents a rather surprising misbehavior
when the "wrong" order was used: the old code didn't throw a syntax error,
but absorbed the INTO clause into the last USING expression, which then did
strange things downstream.

Intentionally not changing the documentation; we'll continue to advertise
only the "standard" clause order.

Backpatch to 8.4, where the USING clause was added to EXECUTE.
This commit is contained in:
Tom Lane 2010-08-19 18:57:57 +00:00
parent f4b4a46f01
commit 9676b01028
1 changed files with 34 additions and 19 deletions
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53
src/pl/plpgsql/src/gram.y
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/pl/plpgsql/src/gram.y,v 1.143 2010/06/25 16:40:13 tgl Exp $
* $PostgreSQL: pgsql/src/pl/plpgsql/src/gram.y,v 1.144 2010/08/19 18:57:57 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1642,26 +1642,41 @@ stmt_dynexecute : K_EXECUTE
new->row = NULL;
new->params = NIL;
/* If we found "INTO", collect the argument */
if (endtoken == K_INTO)
/*
* We loop to allow the INTO and USING clauses to
* appear in either order, since people easily get
* that wrong. This coding also prevents "INTO foo"
* from getting absorbed into a USING expression,
* which is *really* confusing.
*/
for (;;)
{
new->into = true;
read_into_target(&new->rec, &new->row, &new->strict);
endtoken = yylex();
if (endtoken != ';' && endtoken != K_USING)
yyerror("syntax error");
}
/* If we found "USING", collect the argument(s) */
if (endtoken == K_USING)
{
do
if (endtoken == K_INTO)
{
expr = read_sql_expression2(',', ';',
", or ;",
&endtoken);
new->params = lappend(new->params, expr);
} while (endtoken == ',');
if (new->into) /* multiple INTO */
yyerror("syntax error");
new->into = true;
read_into_target(&new->rec, &new->row, &new->strict);
endtoken = yylex();
}
else if (endtoken == K_USING)
{
if (new->params) /* multiple USING */
yyerror("syntax error");
do
{
expr = read_sql_construct(',', ';', K_INTO,
", or ; or INTO",
"SELECT ",
true, true,
NULL, &endtoken);
new->params = lappend(new->params, expr);
} while (endtoken == ',');
}
else if (endtoken == ';')
break;
else
yyerror("syntax error");
}
$$ = (PLpgSQL_stmt *)new;