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Clarify SELECT FOR UPDATE behavior in docs.

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This commit is contained in:
Bruce Momjian 2010-06-15 20:04:53 +00:00
parent b17129b589
commit 77a4c51af8
1 changed files with 4 additions and 3 deletions
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7
doc/src/sgml/ref/select.sgml
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@ -1,5 +1,5 @@
<!-- <!--
$PostgreSQL: pgsql/doc/src/sgml/ref/select.sgml,v 1.130 2010/04/03 07:23:02 petere Exp $ $PostgreSQL: pgsql/doc/src/sgml/ref/select.sgml,v 1.131 2010/06/15 20:04:53 momjian Exp $
PostgreSQL documentation PostgreSQL documentation
--> -->
@ -1200,8 +1200,9 @@ FOR SHARE [ OF <replaceable class="parameter">table_name</replaceable> [, ...] ]
case of a join query, the rows locked are those that contribute to case of a join query, the rows locked are those that contribute to
returned join rows. In addition, rows that satisfied the query returned join rows. In addition, rows that satisfied the query
conditions as of the query snapshot will be locked, although they conditions as of the query snapshot will be locked, although they
will not be returned if they have since been updated to not satisfy will not be returned if they were updated after the snapshot
the query conditions. If a <literal>LIMIT</> is used, locking stops and no longer satisfy the query conditions. If a
<literal>LIMIT</> is used, locking stops
once enough rows have been returned to satisfy the limit (but note that once enough rows have been returned to satisfy the limit (but note that
rows skipped over by <literal>OFFSET</> will get locked). Similarly, rows skipped over by <literal>OFFSET</> will get locked). Similarly,
if <literal>FOR UPDATE</literal> or <literal>FOR SHARE</literal> if <literal>FOR UPDATE</literal> or <literal>FOR SHARE</literal>