MySQL : Connections in SQL Developer
Download the latest "JDBC Driver for MySQL (Connector/J)" from here. Click the "Download" link next to the "JDBC Driver for MySQL (Connector/J)", then select the platform independent version and download the zip file.
Unzip the connector. The resulting directory contains a "mysql-connector-java-5.1.30-bin.jar" file.
Open SQL Developer and navigate to "Tools > Preferences > Database > Third Party JDBC Driver".
Click the "Add Entry..." button and highlight the "mysql-connector-java-5.1.30-bin.jar" file and click the "Select" button.
Click the "OK" button to exit the "Preferences" dialog.
When you create a new connection, you will notice a "MySQL" tab has now appeared. Enter the connection details and test the connection.
For more information see:
Hope this helps. Regards Tim...