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Multiple Query Problems with mysql_query()

I was writing some code earlier today that involved writing data to two separate MySQL tables. The second INSERT statement needed to contain the automatically generated ID (auto_increment) of the first INSERT statement, so I wanted all the queries to run one after another.

Thinking it made the most sense to just build one long query and execute it all at once, I wrote code similar to the following:

Upon running the code I received this error:

So, as I normally do when this kind of problem arises, I echoed the query that was being executed and, hoping to get more information on the error, I ran it directly from phpMyAdmin. Here is the SQL I ran:

phpMyAdmin says:

OK, so my SQL is fine.

I then looked up the mysql_query() function on php.net and found this little tidbit of info:

mysql_query() sends an unique query (multiple queries are not supported) to the currently active database on the server that's associated with the specified link_identifier .

Ah, so multiple queries are not supported with the mysql_query() function. That's most likely a security feature, but quite annoying none the less. The bottom line is, you cannot run multiple queries with mysql_query().

PHP5 has the mysqli_multi_query() function, which does allow you to run multiple queries (I know, I know, I should be coding for PHP5 by now).

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