An UPDATE statement with a VERIFY clause takes the following form:
UPDATE table-list SET column-name = expression, ... [ VERIFY (column-name, ...) VALUES ( expression, ...) ] [ WHERE search-condition ] [ ORDER BY expression [ ASC | DESC ], ... ]
The VERIFY clause can be used only when the table-list parameter consists of a single table. It compares the values of specified columns to a set of expected values, which are the values that were present in the publisher database when the UPDATE statement was applied. When the VERIFY clause is specified, only one table can be updated at a time.
The VERIFY clause is useful only for single-row updates. However, a multi-row UPDATE statement executed on a database is replicated as a set of single-row UPDATE statements by the SQL Remote, so this imposes no constraints on client applications.
Discuter à propos de cette page dans DocCommentXchange.
|Copyright © 2010, iAnywhere Solutions, Inc. - SQL Anywhere 12.0.0|