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Modify processing of DECLARE CURSOR and EXPLAIN so that they can resolve the

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types of unspecified parameters when submitted via extended query protocol.
This worked in 8.2 but I had broken it during plancache changes.  DECLARE
CURSOR is now treated almost exactly like a plain SELECT through parse
analysis, rewrite, and planning; only just before sending to the executor
do we divert it away to ProcessUtility.  This requires a special-case check
in a number of places, but practically all of them were already special-casing
SELECT INTO, so it's not too ugly.  (Maybe it would be a good idea to merge
the two by treating IntoClause as a form of utility statement?  Not going to
worry about that now, though.)  That approach doesn't work for EXPLAIN,
however, so for that I punted and used a klugy solution of running parse
analysis an extra time if under extended query protocol.
This commit is contained in:
Tom Lane
2007-04-27 22:05:49 +00:00
parent a264671116
commit bbbe825f5f
26 changed files with 333 additions and 246 deletions
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24
src/backend/commands/prepare.c
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@@ -10,7 +10,7 @@
* Copyright (c) 2002-2007, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/prepare.c,v 1.74 2007/04/26 23:24:44 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/prepare.c,v 1.75 2007/04/27 22:05:47 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -57,7 +57,6 @@ PrepareQuery(PrepareStmt *stmt, const char *queryString)
int nargs;
List *queries;
Query *query;
const char *commandTag;
List *query_list,
*plan_list;
int i;
@@ -137,22 +136,15 @@ PrepareQuery(PrepareStmt *stmt, const char *queryString)
switch (query->commandType)
{
case CMD_SELECT:
commandTag = "SELECT";
break;
case CMD_INSERT:
commandTag = "INSERT";
break;
case CMD_UPDATE:
commandTag = "UPDATE";
break;
case CMD_DELETE:
commandTag = "DELETE";
/* OK */
break;
default:
ereport(ERROR,
(errcode(ERRCODE_INVALID_PSTATEMENT_DEFINITION),
errmsg("utility statements cannot be prepared")));
commandTag = NULL; /* keep compiler quiet */
break;
}
@@ -168,7 +160,7 @@ PrepareQuery(PrepareStmt *stmt, const char *queryString)
StorePreparedStatement(stmt->name,
stmt->query,
queryString,
commandTag,
CreateCommandTag((Node *) query),
argtypes,
nargs,
0, /* default cursor options */
@@ -244,11 +236,12 @@ ExecuteQuery(ExecuteStmt *stmt, const char *queryString,
errmsg("prepared statement is not a SELECT")));
pstmt = (PlannedStmt *) linitial(plan_list);
if (!IsA(pstmt, PlannedStmt) ||
pstmt->commandType != CMD_SELECT)
pstmt->commandType != CMD_SELECT ||
pstmt->utilityStmt != NULL)
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("prepared statement is not a SELECT")));
pstmt->into = copyObject(stmt->into);
pstmt->intoClause = copyObject(stmt->into);
MemoryContextSwitchTo(oldContext);
@@ -689,7 +682,8 @@ ExplainExecuteQuery(ExecuteStmt *execstmt, ExplainStmt *stmt,
if (execstmt->into)
{
if (pstmt->commandType != CMD_SELECT)
if (pstmt->commandType != CMD_SELECT ||
pstmt->utilityStmt != NULL)
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("prepared statement is not a SELECT")));
@@ -697,7 +691,7 @@ ExplainExecuteQuery(ExecuteStmt *execstmt, ExplainStmt *stmt,
/* Copy the stmt so we can modify it */
pstmt = copyObject(pstmt);
pstmt->into = execstmt->into;
pstmt->intoClause = execstmt->into;
}
/*