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Add new SPI_OK_REWRITTEN return code to SPI_execute and friends, for the

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case that the command is rewritten into another type of command. The old
behavior to return the command tag of the last executed command was
pretty surprising. In PL/pgSQL, for example, it meant that if a command
was rewritten to a utility statement, FOUND wasn't set at all.
This commit is contained in:
Heikki Linnakangas 2009-01-21 11:02:40 +00:00
parent 0154345078
commit 94136d5a18
4 changed files with 36 additions and 16 deletions
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12
doc/src/sgml/spi.sgml
View File

@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/spi.sgml,v 1.63 2009/01/07 13:44:36 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/spi.sgml,v 1.64 2009/01/21 11:02:40 heikki Exp $ -->
<chapter id="spi">
<title>Server Programming Interface</title>
@ -527,6 +527,16 @@ typedef struct
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><symbol>SPI_OK_REWRITTEN</symbol></term>
<listitem>
<para>
if the command was rewritten into another kind of command (e.g.,
<command>UPDATE</command> became an <command>INSERT</command>) by a <link linkend="rules">rule</link>.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>

11
src/backend/executor/spi.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/executor/spi.c,v 1.206 2009/01/07 20:38:56 tgl Exp $
* $PostgreSQL: pgsql/src/backend/executor/spi.c,v 1.207 2009/01/21 11:02:40 heikki Exp $
*
*-------------------------------------------------------------------------
*/
@ -1490,6 +1490,8 @@ SPI_result_code_string(int code)
return "SPI_OK_DELETE_RETURNING";
case SPI_OK_UPDATE_RETURNING:
return "SPI_OK_UPDATE_RETURNING";
case SPI_OK_REWRITTEN:
return "SPI_OK_REWRITTEN";
}
/* Unrecognized code ... return something useful ... */
sprintf(buf, "Unrecognized SPI code %d", code);
@ -1910,11 +1912,12 @@ fail:
_SPI_current->tuptable = NULL;
/*
* If none of the queries had canSetTag, we return the last query's result
* code, but not its auxiliary results (for backwards compatibility).
* If none of the queries had canSetTag, return SPI_OK_REWRITTEN. Prior
* to 8.4, we used return the last query's result code, but not its
* auxiliary results, but that's confusing.
*/
if (my_res == 0)
my_res = res;
my_res = SPI_OK_REWRITTEN;
return my_res;
}

3
src/include/executor/spi.h
View File

@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/executor/spi.h,v 1.70 2009/01/07 20:38:56 tgl Exp $
* $PostgreSQL: pgsql/src/include/executor/spi.h,v 1.71 2009/01/21 11:02:40 heikki Exp $
*
*-------------------------------------------------------------------------
*/
@ -56,6 +56,7 @@ typedef struct _SPI_plan *SPIPlanPtr;
#define SPI_OK_INSERT_RETURNING 11
#define SPI_OK_DELETE_RETURNING 12
#define SPI_OK_UPDATE_RETURNING 13
#define SPI_OK_REWRITTEN 14
extern PGDLLIMPORT uint32 SPI_processed;
extern PGDLLIMPORT Oid SPI_lastoid;

26
src/pl/plpgsql/src/pl_exec.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/pl/plpgsql/src/pl_exec.c,v 1.229 2009/01/14 09:53:51 heikki Exp $
* $PostgreSQL: pgsql/src/pl/plpgsql/src/pl_exec.c,v 1.230 2009/01/21 11:02:40 heikki Exp $
*
*-------------------------------------------------------------------------
*/
@ -2782,19 +2782,13 @@ exec_stmt_execsql(PLpgSQL_execstate *estate,
/*
* Check for error, and set FOUND if appropriate (for historical reasons
* we set FOUND only for certain query types).
*
* Note: the command type indicated by return code might not match
* mod_stmt, if there is an INSTEAD OF rule rewriting an UPDATE into an
* INSERT, for example. In that case, the INSERT doesn't have canSetTag
* set, mod_stmt is false, and SPI_execute_plan sets SPI_processed to
* zero. We'll set FOUND to false here in that case. If the statement is
* rewritten into a utility statement, however, FOUND is left unchanged.
* Arguably that's a bug, but changing it now could break applications.
* we set FOUND only for certain query types). Also Assert that we
* identified the statement type the same as SPI did.
*/
switch (rc)
{
case SPI_OK_SELECT:
Assert(!stmt->mod_stmt);
exec_set_found(estate, (SPI_processed != 0));
break;
@ -2804,11 +2798,23 @@ exec_stmt_execsql(PLpgSQL_execstate *estate,
case SPI_OK_INSERT_RETURNING:
case SPI_OK_UPDATE_RETURNING:
case SPI_OK_DELETE_RETURNING:
Assert(stmt->mod_stmt);
exec_set_found(estate, (SPI_processed != 0));
break;
case SPI_OK_SELINTO:
case SPI_OK_UTILITY:
Assert(!stmt->mod_stmt);
break;
case SPI_OK_REWRITTEN:
Assert(!stmt->mod_stmt);
/*
* The command was rewritten into another kind of command. It's
* not clear what FOUND would mean in that case (and SPI doesn't
* return the row count either), so just set it to false.
*/
exec_set_found(estate, false);
break;
default: