i try to connect from Arduino to wifi and MySQL database. What is best modul for connection and best way to connect and insert/update/delete data? Thanks
As you haven't posted any codes I can just suggest you how you can do that.
What is best module for connection ?
The selection of best module depends on your need. If the device that you are going to built is moving one like devices on vehicle then I would suggest you GSM module for doing this ( GSM 900A is pretty nice). Else if it is a static device like an automated rain meter gauge then you can use wifi module as per availability of wifi connectivity.
Best way to connect and insert/update/delete data?
So this I would suggest using PHP. In this you first need to setup a PHP code which would insert value to database when that page is requested from arduino. As you haven't posted any codes I think you haven't tried anything yet. So more information on this can be found here.
This link may work:
Arduino-ESP8266
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