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Support UPDATE/DELETE WHERE CURRENT OF cursor_name, per SQL standard.

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Along the way, allow FOR UPDATE in non-WITH-HOLD cursors; there may once
have been a reason to disallow that, but it seems to work now, and it's
really rather necessary if you want to select a row via a cursor and then
update it in a concurrent-safe fashion.

Original patch by Arul Shaji, rather heavily editorialized by Tom Lane.
This commit is contained in:
Tom Lane
2007-06-11 01:16:30 +00:00
parent 85d72f0516
commit 6808f1b1de
30 changed files with 940 additions and 127 deletions
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18
src/backend/nodes/readfuncs.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/readfuncs.c,v 1.207 2007/06/05 21:31:04 tgl Exp $
* $PostgreSQL: pgsql/src/backend/nodes/readfuncs.c,v 1.208 2007/06/11 01:16:22 tgl Exp $
*
* NOTES
* Path and Plan nodes do not have any readfuncs support, because we
@ -873,6 +873,20 @@ _readSetToDefault(void)
READ_DONE();
}
/*
* _readCurrentOfExpr
*/
static CurrentOfExpr *
_readCurrentOfExpr(void)
{
READ_LOCALS(CurrentOfExpr);
READ_UINT_FIELD(cvarno);
READ_STRING_FIELD(cursor_name);
READ_DONE();
}
/*
* _readTargetEntry
*/
@ -1093,6 +1107,8 @@ parseNodeString(void)
return_value = _readCoerceToDomainValue();
else if (MATCH("SETTODEFAULT", 12))
return_value = _readSetToDefault();
else if (MATCH("CURRENTOFEXPR", 13))
return_value = _readCurrentOfExpr();
else if (MATCH("TARGETENTRY", 11))
return_value = _readTargetEntry();
else if (MATCH("RANGETBLREF", 11))