I am working with arduino on a project that measures wind speed and direction. I want to transfer the information I received from the sensors to the mysql database. I have an esp8266 serial wifi module. How can I use this module to save information to the database? Please help me!
If on your LAN: consider the MySQL connector library, then you can connect directly to MySQL.
Otherwise: use an http POST request to send your data; on the receiving end a Python or PHP script that reads the data, validates it (don't forget that step - don't trust any data you get over an Internet interface), and write it to your database.
Also, search the forum for mysql. There have been plenty of threads on the topic. IIRC, I saw one yesterday.