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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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27
doc/src/sgml/plpgsql.sgml
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@@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/plpgsql.sgml,v 1.97 2006/06/16 23:29:26 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/plpgsql.sgml,v 1.98 2006/08/12 20:05:54 tgl Exp $ -->
<chapter id="plpgsql">
<title><application>PL/pgSQL</application> - <acronym>SQL</acronym> Procedural Language</title>
@@ -2040,9 +2040,8 @@ END LOOP <optional> <replaceable>label</replaceable> </optional>;
The <replaceable>target</replaceable> is a record variable, row variable,
or comma-separated list of scalar variables.
The <replaceable>target</replaceable> is successively assigned each row
resulting from the <replaceable>query</replaceable> (which must be a
<command>SELECT</command> command) and the loop body is executed for each
row. Here is an example:
resulting from the <replaceable>query</replaceable> and the loop body is
executed for each row. Here is an example:
<programlisting>
CREATE FUNCTION cs_refresh_mviews() RETURNS integer AS $$
DECLARE
@@ -2069,6 +2068,15 @@ $$ LANGUAGE plpgsql;
assigned row value is still accessible after the loop.
</para>
<para>
The <replaceable>query</replaceable> used in this type of <literal>FOR</>
statement can be any query that returns rows to the caller:
<command>SELECT</> (without <literal>INTO</>) is the most common case,
but you can also use <command>INSERT</>, <command>UPDATE</>, or
<command>DELETE</> with a <literal>RETURNING</> clause. Some utility
commands such as <command>EXPLAIN</> will work too.
</para>
<para>
The <literal>FOR-IN-EXECUTE</> statement is another way to iterate over
rows:
@@ -2078,12 +2086,11 @@ FOR <replaceable>target</replaceable> IN EXECUTE <replaceable>text_expression</r
<replaceable>statements</replaceable>
END LOOP <optional> <replaceable>label</replaceable> </optional>;
</synopsis>
This is like the previous form, except that the source
<command>SELECT</command> statement is specified as a string
expression, which is evaluated and replanned on each entry to
the <literal>FOR</> loop. This allows the programmer to choose the speed of
a preplanned query or the flexibility of a dynamic query, just
as with a plain <command>EXECUTE</command> statement.
This is like the previous form, except that the source query
is specified as a string expression, which is evaluated and replanned
on each entry to the <literal>FOR</> loop. This allows the programmer to
choose the speed of a preplanned query or the flexibility of a dynamic
query, just as with a plain <command>EXECUTE</command> statement.
</para>
<note>