wpcf7_before_send_mail does not work for me

I have a contact form and I want to create a database entry at the same time the contact form emal gets sent. Too try it out I have created a testfunction which looks like this:

function testfunc( $cf7 )
{
mysql_connect("localhost", "user_name", "password") or die(mysql_error());
mysql_select_db("database_name") or die(mysql_error());
mysql_query("CREATE TABLE aaaaaaaaaaa ( test VARCHAR(30))") or die(mysql_error());
}

This function should only test if the database is editable.

I also inserted the line add_action( 'wpcf7_before_send_mail', 'testfunc', 1); to run the testfunction.

The only problem is, that it is not working. When I run the function in a seperate php-file it all works out but within the plugin nothing happends.

https://ww.wp.xz.cn/plugins/contact-form-7/