You need to create a service for the purpose of saving image in MySQL database.
There are many approaches through which you can get your job done. A google/bing search with some good keywords can yield 100s of good artcles on this topic.
However, for a step by step solution you can refer to following article which has proposed solution using PHP and MySQL-
Android Upload Image to Server Using PHP MySQL[
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You can refer to the video tutorial too.
In case you find any difficulties while implementing this, please let me know with the details of the issue.
Hope, it helps :)