The return value of mysql_query () function

The return value of mysql_query () function

Problem description:

When I was operating mysql and inserting data, the resource was closed and PHP prompts a warning. The content is roughly, and a resource type is required for mysql_free_result.

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

Analysis:

When reading the manual, it seems that the mysql_query () function returns the resource type, but why is it a bool value now? Well, after reading the manual patiently, I found that the principle is like this, for example:

Summary:As you can see, when mysql_query () executes an SQL statement, it does not always need to release the result set. Instead, it calls mysql_free_result () for release only when some operations generate a result set; bool values returned, such as insert update, are not required. Otherwise, the image will be superfluous.

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