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Improve UPDATE/DELETE WHERE CURRENT OF so that they can be used from plpgsql

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with a plpgsql-defined cursor.  The underlying mechanism for this is that the
main SQL engine will now take "WHERE CURRENT OF $n" where $n is a refcursor
parameter.  Not sure if we should document that fact or consider it an
implementation detail.  Per discussion with Pavel Stehule.
This commit is contained in:
Tom Lane
2007-06-11 22:22:42 +00:00
parent bdc71c2cb1
commit a9545b3aef
13 changed files with 225 additions and 72 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 1.111 2007/06/11 15:08:32 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/plpgsql.sgml,v 1.112 2007/06/11 22:22:40 tgl Exp $ -->
<chapter id="plpgsql">
<title><application>PL/pgSQL</application> - <acronym>SQL</acronym> Procedural Language</title>
@ -2614,6 +2614,31 @@ MOVE <optional> <replaceable>direction</replaceable> { FROM | IN } </optional> <
MOVE curs1;
MOVE LAST FROM curs3;
MOVE RELATIVE -2 FROM curs4;
</programlisting>
</para>
</sect3>
<sect3>
<title><literal>UPDATE/DELETE WHERE CURRENT OF</></title>
<synopsis>
UPDATE <replaceable>table</replaceable> SET ... WHERE CURRENT OF <replaceable>cursor</replaceable>;
DELETE FROM <replaceable>table</replaceable> WHERE CURRENT OF <replaceable>cursor</replaceable>;
</synopsis>
<para>
When a cursor is positioned on a table row, that row can be updated
or deleted using the cursor to identify the row. Note that this
only works for simple (non-join, non-grouping) cursor queries.
For additional information see the
<xref linkend="sql-declare" endterm="sql-declare-title">
reference page.
</para>
<para>
An example:
<programlisting>
UPDATE foo SET dataval = myval WHERE CURRENT OF curs1;
</programlisting>
</para>
</sect3>