append-toMySQL-with-datasource-and-pooling.xml

<configuration>

  <appender name="DB" class="ch.qos.logback.classic.db.DBAppender">
    <connectionSource class="ch.qos.logback.core.db.DataSourceConnectionSource">
      <dataSource class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <driverClass>com.mysql.jdbc.Driver</driverClass>
        <jdbcUrl>jdbc:mysql://localhost:3306/logbackdb</jdbcUrl>
        <user>logback</user>
        <password>logback</password>
      </dataSource>
    </connectionSource>
  </appender>

  <root level="debug">
    <appender-ref ref="DB"/>
  </root>
</configuration>