java + jdbc + 存储过程实现分页

原来的分页逻辑
1、根据页数查询数据
2、查询总条数

存储过程实现就必须拿到分页数据和总条数

create package pkg_query 
       as
       type cur_query is ref cursor;
end pkg_query;

--利用存储过程实现分页 
create or replace procedure page1(
v_start in number,               -- 起始条数
v_end in number,                 -- 结束条数   
v_data out pkg_query.cur_query,  -- 返回的列表
v_size out number                -- 表的总条数
)is
  v_sql varchar2(300);

begin
  select count(*) into v_size from emp;
  v_sql := 'select * from (select t.*, rownum as r from (select * from emp order by hiredate desc) t) t1 where t1.r>'||v_start||' and t1.r<='||v_end;
  open v_data for v_sql;
  execute immediate v_sql;

end;

jdbc调用：

public void showEmpPage() {
        //加载驱动
            try {
                Class.forName("oracle.jdbc.driver.OracleDriver");
            } catch (ClassNotFoundException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            }

            //创建链接
            Connection conn = null;
            try {
                conn = DriverManager.
                getConnection("jdbc:oracle:thin:@127.0.0.1:1521:orcl", "scott", "tiger");
                System.out.println(conn);
            } catch (SQLException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            }

            //创建预处理sql 对象  == 创建存错过程调用对象
            try {

                CallableStatement call = conn.prepareCall("call page1(?,?,?,?)");
                //设置输入参数
                call.setInt(1, 5);
                call.setInt(2, 10);
                //设置输出参数   注册第几个参数返回数据类型是什么
                call.registerOutParameter(3, OracleTypes.CURSOR);
                call.registerOutParameter(4, Types.INTEGER);

                //发送并执行sql
                call.execute();

                ResultSet rs = (ResultSet) call.getObject(3);

                while(rs.next()) {
                    System.out.println(rs.getString("ename") + " =="+rs.getDouble("sal"));
                }


                System.out.println(call.getObject(4));


            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }


    }