Have you ever wanted to use a local database server to store data from your Arduino projects? Would you like to be able to send queries directly to a MySQL database from your Arduino sketch? Well, now you can!
The MySQL Connector/Arduino is a new technology made for the Arduino permitting you to connect your Arduino project to a MySQL server via an Ethernet shield without using an intermediate computer or a web-based service.
Having direct access to a database server means you can store data acquired from your project as well as check values stored in tables on the server and keep the network local to your facility including having a network that isn’t connected to the internet or any other network.
The Connector/Arduino library allows you to issue queries to the database server in much the same manner as you would through the MySQL client application. You can insert, delete, and update data, call functions, create objects, etc. Issuing SELECT queries are also possible but they incur a bit more thought concerning memory management.
http://drcharlesbell.blogspot.com/2013/04/introducing-mysql-connectorarduino_6.html
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that connector work in arduino yun?