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With inspiration from other libraries

There is a newer version: 2.12.15

/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.core.db;

import java.sql.Connection;
import java.sql.SQLException;

import ch.qos.logback.core.db.dialect.SQLDialectCode;
import ch.qos.logback.core.spi.LifeCycle;

/**
 *  The ConnectionSource interface provides a pluggable means of
 *  transparently obtaining JDBC {@link java.sql.Connection}s for logback classes
 *  that require the use of a {@link java.sql.Connection}.
 *  
 * For more information about this component, please refer to the online manual at
 * http://logback.qos.ch/manual/appenders.html#DBAppender
 *
 *  @author Ray DeCampo
 */
public interface ConnectionSource extends LifeCycle {

    /**
     *  Obtain a {@link java.sql.Connection} for use.  The client is
     *  responsible for closing the {@link java.sql.Connection} when it is no
     *  longer required.
     *
     *  @throws SQLException  if a {@link java.sql.Connection} could not be
     *                        obtained
     */
    Connection getConnection() throws SQLException;

    /**
     * Get the SQL dialect that should be used for this connection. Note that the
     * dialect is not needed if the JDBC driver supports the getGeneratedKeys 
     * method.
     */
    SQLDialectCode getSQLDialectCode();

    /**
     * If the connection supports the JDBC 3.0 getGeneratedKeys method, then
     * we do not need any specific dialect support.
     */
    boolean supportsGetGeneratedKeys();

    /**
     * If the connection does not support batch updates, we will avoid using them.
     */
    boolean supportsBatchUpdates();
}