public class LangDemo {

  public static void main(String[] args) throws Exception{

      try {

                 //加载驱动

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

                //创建连接

                Connection   cn=DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:XE","hh","hh");

                Statement sm=cn.createStatement();

                //获得结果集

                ResultSet rs=sm.executeQuery("select name,nickname,id from a");

                //遍历结果集

                 while(rs.next()){

System.out.println("name:"+rs.getString(1));//rs.getString(“name”)

System.out.println("nickname:"+rs.getString(2));  //rs.getInt(“id”)

}

        } catch (Exception e) {

                   e.printStackTrace();

        }finally{   // rs.close();

                               // conn.close();

                 }

    }

}

public class LangDemo {

  public static void main(String[] args) throws Exception{

    Connection con = null;// 创建一个数据库连接

       PreparedStatement pre = null;// 创建预编译语句对象，一般都是用这个而不用Statement

       ResultSet result = null;// 创建一个结果集对象

     try

      {

        Class.forName("oracle.jdbc.driver.OracleDriver");// 加载Oracle驱动程序

        System.out.println("开始尝试连接数据库！");

        String url = "jdbc:oracle:" + "thin:@127.0.0.1:1521:XE"; // 127.0.0.1是本机地址，XE是精简版Oracle的默认数据库名

        String user ="system";// 用户名,系统默认的账户名

        String password = "147";// 你安装时选设置的密码

        con = DriverManager.getConnection(url, user, password);// 获取连接

        System.out.println("连接成功！");

        String sql = "select * from student where name=?";// 预编译语句，“？”代表参数

        pre = con.prepareStatement(sql);// 实例化预编译语句

        pre.setString(1, "张三");// 设置参数，前面的1表示参数的索引，而不是表中列名的索引

        result = pre.executeQuery();// 执行查询，注意括号中不需要再加参数

        while (result.next())

            // 当结果集不为空时

            System.out.println("学号:" + result.getInt("id") + "姓名:"

                    + result.getString("name"));

     }

      catch (Exception e)

       {

            e.printStackTrace();

        }

       finally  {

            ……..

        }

    }

}

public class LangDemo {

    public static void main(String[] args) throws Exception{

        try {

            //加载驱动

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

            //创建连接

            Connection cn=DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:XE","hh","hh");

            //调用存储过程(存储过程的两个值都是in)

           CallableStatement sm=cn.prepareCall("{call lv_three(?,?)}");

           //赋值

           sm.setString(1, "jerry");

           sm.setInt(2, 1800);

           sm.execute();

           //释放资源

           sm.close();

           cn.close();

        } catch (Exception e) {

            e.printStackTrace();

        }finally{

             // sm.close();

             // conn.close();

        }

    }

}

public class LangDemo {

    public static void main(String[] args) throws Exception{

        try {

            //加载驱动

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

            //创建连接

            Connection   cn=DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:XE","hh","hh");

            //调用存储过程(存储过程的第一个参数是in,第二个参数是out)

           CallableStatement sm=cn.prepareCall("{call lv_four(?,?)}");

           //赋值

           sm.setInt(1, 1);

           sm.registerOutParameter(2, oracle.jdbc.OracleTypes.VARCHAR);//固定的

　　　  sm.execute() String namestr=sm.getString(2);

           System.out.println("名称是："+namestr);

           sm.close(); //释放资源

           cn.close();

        } catch (Exception e) {

                   e.printStackTrace();

        }finally{

        　　 // sm.close();

            // conn.close();

        }

    }

}

public class LangDemo {

  public static void main(String[] args) throws Exception{

      try {

            //加载驱动

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

            //创建连接

            Connection   cn=DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:XE","hh","hh");

            //调用存储过程(两个out参数)

           CallableStatement sm=cn.prepareCall("{call lv_four(?,?)}");

           //赋值

           sm.registerOutParameter(1, oracle.jdbc.OracleTypes.NUMBER);

           sm.registerOutParameter(2, oracle.jdbc.OracleTypes.VARCHAR);

           sm.execute();

            int sid=sm.getInt(1);

           String namestr=sm.getString(2);

           System.out.println(“名称是：”+namestr+”id是”+sid);

           sm.close(); //释放资源

           cn.close();

        } catch (Exception e) {

            e.printStackTrace();

        }finally{

            // sm.close();

            // conn.close();

        }

    }

}
        

public class LangDemo {

  public static void main(String[] args) throws Exception{

      try {

           //加载驱动

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

           //创建连接

           Connection   cn=DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:XE","hh","hh");

           //调用存储过程(参数为in out类型)

           CallableStatement sm=cn.prepareCall("{call getsal(?)}");

           //赋值

          sm.setInt(1,1);    //  sm.setDouble(1,800);

      sm.registerOutParameter(1, oracle.jdbc.OracleTypes.NUMBER);

       sm.execute();

          int sid=sm.getInt(1);    // double d = sm.getDouble(1)

          System.out.println("id是："+sid);

          sm.close(); //释放资源

          cn.close();

        } catch (Exception e) {

                   e.printStackTrace();

        }finally{

             // sm.close();

             // conn.close();

        }

    }

}