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Fix the mechanism for reporting the original table OID and column number

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of columns of a query result so that it can "see through" cursors and
prepared statements.  Per gripe a couple months back from John DeSoi.
This commit is contained in:
Tom Lane
2005-06-22 17:45:46 +00:00
parent 84d73a6dbc
commit e98edb5555
6 changed files with 121 additions and 34 deletions
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53
src/backend/tcop/pquery.c
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@ -8,13 +8,14 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/tcop/pquery.c,v 1.93 2005/03/25 21:57:58 tgl Exp $
* $PostgreSQL: pgsql/src/backend/tcop/pquery.c,v 1.94 2005/06/22 17:45:46 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "commands/prepare.h"
#include "commands/trigger.h"
#include "executor/executor.h"
#include "miscadmin.h"
@ -252,6 +253,56 @@ ChoosePortalStrategy(List *parseTrees)
return strategy;
}
/*
* FetchPortalTargetList
* Given a portal that returns tuples, extract the query targetlist.
* Returns NIL if the portal doesn't have a determinable targetlist.
*
* Note: do not modify the result.
*
* XXX be careful to keep this in sync with FetchPreparedStatementTargetList,
* and with UtilityReturnsTuples.
*/
List *
FetchPortalTargetList(Portal portal)
{
if (portal->strategy == PORTAL_ONE_SELECT)
return ((Query *) linitial(portal->parseTrees))->targetList;
if (portal->strategy == PORTAL_UTIL_SELECT)
{
Node *utilityStmt;
utilityStmt = ((Query *) linitial(portal->parseTrees))->utilityStmt;
switch (nodeTag(utilityStmt))
{
case T_FetchStmt:
{
FetchStmt *substmt = (FetchStmt *) utilityStmt;
Portal subportal;
Assert(!substmt->ismove);
subportal = GetPortalByName(substmt->portalname);
Assert(PortalIsValid(subportal));
return FetchPortalTargetList(subportal);
}
case T_ExecuteStmt:
{
ExecuteStmt *substmt = (ExecuteStmt *) utilityStmt;
PreparedStatement *entry;
Assert(!substmt->into);
entry = FetchPreparedStatement(substmt->name, true);
return FetchPreparedStatementTargetList(entry);
}
default:
break;
}
}
return NIL;
}
/*
* PortalStart
* Prepare a portal for execution.