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Tweak SPI_cursor_open to allow INSERT/UPDATE/DELETE RETURNING; this was

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merely a matter of fixing the error check, since the underlying Portal
infrastructure already handles it.  This in turn allows these statements
to be used in some existing plpgsql and plperl contexts, such as a
plpgsql FOR loop.  Also, do some marginal code cleanup in places that
were being sloppy about distinguishing SELECT from SELECT INTO.
This commit is contained in:
Tom Lane
2006-08-12 20:05:56 +00:00
parent 883f4b42d7
commit 3f8db37c2f
16 changed files with 152 additions and 114 deletions
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28
doc/src/sgml/spi.sgml
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@@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/spi.sgml,v 1.45 2006/03/10 19:10:49 momjian Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/spi.sgml,v 1.46 2006/08/12 20:05:54 tgl Exp $ -->
<chapter id="spi">
<title>Server Programming Interface</title>
@@ -535,15 +535,15 @@ typedef struct
<term><symbol>SPI_ERROR_TRANSACTION</symbol></term>
<listitem>
<para>
if any command involving transaction manipulation was attempted
(<command>BEGIN</>,
<command>COMMIT</>,
<command>ROLLBACK</>,
<command>SAVEPOINT</>,
<command>PREPARE TRANSACTION</>,
<command>COMMIT PREPARED</>,
<command>ROLLBACK PREPARED</>,
or any variant thereof)
if any command involving transaction manipulation was attempted
(<command>BEGIN</>,
<command>COMMIT</>,
<command>ROLLBACK</>,
<command>SAVEPOINT</>,
<command>PREPARE TRANSACTION</>,
<command>COMMIT PREPARED</>,
<command>ROLLBACK PREPARED</>,
or any variant thereof)
</para>
</listitem>
</varlistentry>
@@ -917,10 +917,12 @@ bool SPI_is_cursor_plan(void * <parameter>plan</parameter>)
<para>
<function>SPI_is_cursor_plan</function> returns <symbol>true</symbol>
if a plan prepared by <function>SPI_prepare</function> can be passed
as an argument to <function>SPI_cursor_open</function> and <symbol>
false</symbol> if that is not the case. The criteria are that the
as an argument to <function>SPI_cursor_open</function>, or
<symbol>false</symbol> if that is not the case. The criteria are that the
<parameter>plan</parameter> represents one single command and that this
command is a <command>SELECT</command> without an <command>INTO</command>
command returns tuples to the caller; for example, <command>SELECT</>
is allowed unless it contains an <literal>INTO</> clause, and
<command>UPDATE</> is allowed only if it contains a <literal>RETURNING</>
clause.
</para>
</refsect1>