jdbC derby 数据库编程

[未来代码]

import java.sql.*;

public class Testone {

	/**
	 * @param args
	 * @throws Exception 
	 */
	public static void main(String[] args) throws Exception {
		Class.forName("org.apache.derby.jdbc.ClientDriver");
		Connection conn = DriverManager.getConnection("jdbc:derdy://localhost:1527//COREJAVA;create=true","User","jian");
	}

}

另外，我已经把org.apache.derby.jdbc导入到path里面了，怎么还会出现异常
Exception in thread "main" java.sql.SQLException: No suitable driver found for
jdbc:derdy://localhost:1527//COREJAVA;create=true
at java.sql.DriverManager.getConnection(DriverManager.java:604)
at java.sql.DriverManager.getConnection(DriverManager.java:221)
at Testone.main(Testone.java:11)


另外Derby的驱动到底是怎么回事啊？