database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-12-21 05:21:08 +03:00
Code Activity

Modify UPDATE/DELETE WHERE CURRENT OF to use the FOR UPDATE infrastructure to

Browse Source 
locate the target row, if the cursor was declared with FOR UPDATE or FOR
SHARE.  This approach is more flexible and reliable than digging through the
plan tree; for instance it can cope with join cursors.  But we still provide
the old code for use with non-FOR-UPDATE cursors.  Per gripe from Robert Haas.
This commit is contained in:
Tom Lane
2008-11-16 17:34:28 +00:00
parent 30f272a79b
commit 18004101ac
9 changed files with 246 additions and 70 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
doc/src/sgml/plpgsql.sgml
View File

@@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/plpgsql.sgml,v 1.135 2008/10/28 22:02:05 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/plpgsql.sgml,v 1.136 2008/11/16 17:34:28 tgl Exp $ -->
<chapter id="plpgsql">
<title><application>PL/pgSQL</application> - <acronym>SQL</acronym> Procedural Language</title>
@@ -2674,9 +2674,10 @@ DELETE FROM <replaceable>table</replaceable> WHERE CURRENT OF <replaceable>curso
<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
or deleted using the cursor to identify the row. There are
restrictions on what the cursor's query can be (in particular,
no grouping) and it's best to use <literal>FOR UPDATE</> in the
cursor. For additional information see the
<xref linkend="sql-declare" endterm="sql-declare-title">
reference page.
</para>