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POCREATE FUNCTION error "This function has none of DETERMINISTIC, NO SQL, or READS SQL DATA"
 

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    <p>Our database has a function to generate an order number. It reads a value from a Settings table, increments it, then returns the new value. For example:</p> <pre><code>CREATE FUNCTION NextOrderNumber() RETURNS INTEGER UNSIGNED NOT DETERMINISTIC BEGIN DECLARE number INTEGER UNSIGNED; UPDATE Settings SET IntegerValue=LAST_INSERT_ID(IntegerValue+1) WHERE KeyName='NextOrderNumber'; SET number=LAST_INSERT_ID(); return number; END </code></pre> <p>Note: Don't critique this function I know it has flaws it's just for illustration.</p> <p>We use this function as follows:</p> <pre><code>INSERT INTO Orders(OrderNumber, ...) SELECT NextOrderNumber(), ... </code></pre> <p>When binary logging is enabled, CREATE FUNCTION gives this error:</p> <blockquote> <p>This function has none of DETERMINISTIC, NO SQL, or READS SQL DATA in its declaration and binary logging is enabled (you <em>might</em> want to use the less safe log_bin_trust_function_creators variable)</p> </blockquote> <p>Regardless of what binlog_format is set, is there really a problem with the above function? According to my reading of the relevant <a href="http://dev.mysql.com/doc/refman/5.1/en/stored-programs-logging.html" rel="noreferrer">MySQL page</a> I can't see any reason why this function would be incompatible with replication, with either ROW or STATEMENT level binary logging.</p> <p>If the function is safe, setting the global log_bin_trust_function_creators=1 makes me uneasy. I don't want to disable this check for all functions, just this one. Could I instead just flag the function as NO SQL to suppress the warning? I tried it and it worked. Will this cause any problem?</p>
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