A brief discussion on the return value of the mysql_query() function

Problem description:

I was operating mysql and when inserting data, I closed the resource and PHP prompted a warning. The content is roughly as follows: you need to give mysql_free_result() a resource type.

Then, I will return the result var_dump ($res) and find that it is a bool value

Analysis:

When I read the manual, at first glance, I feel that the mysql_query() function returns the resource type, but why is it now? Is the bool value

Summary: From the above, we can know that when mysql_query() executes a sql statement, it does not need to release the result set whenever, but when certain operations produce a result set, it calls mysql_free_result() to release; There is no need to return bool values ​​like insert update, otherwise it will be superfluous

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