2.   在Myeclipse中新建java项目导入jdbc包（classes12.jar）:

       右键项目 bulid path -〉add external archives 选择classes12.jar

3.   新建java文件, lianxi01.java

import java.sql.Connection;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement; 

importoracle.jdbc.*;

importoracle.jdbc.driver.*;

publicclasslianxi01 {

    publicstaticvoid main(String[] args)throws SQLException, ClassNotFoundException{

        //TODO Auto-generated method stub

        oracle.jdbc.OracleDriver.isDebug();

        Class.forName("oracle.jdbc.driver.OracleDriver");

        java.sql.DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());

        //

        String url ="jdbc:oracle:thin:@100.100.100.20:1521:dbsid2";

        String user="scott";

        String password="tiger";

        String sql="select table_name from user_tables";

        String sql2="select * from dept";

        //

        Connection con=java.sql.DriverManager.getConnection(url, user, password);

    Statement stmt=con.createStatement();

        ResultSet rs=((java.sql.Statement) stmt).executeQuery(sql2);

        while(rs.next()){

        //   String s=rs.getString(2);  

        System.out.println(rs.getString(1) +" " + rs.getString(2)+"  "+ rs.getString(3));

        }

    }

}

4. 点击运行，即可进行数据库查询

5. 注： String url一行，@100.100.100.20:1521:dbsid2需要根据实际IP和服务名进行修改。