ADO调用分页查询存储过程的实例讲解_实用技巧

----------使用存储过程编写一个分页查询-----------------------
set nocount off --关闭SqlServer消息
--set nocount on --开启SqlServer消息
go
create proc usp_getMyStudentsDataByPage
--输入参数
@pagesize int=7,--每页记录条数
@pageindex int=1,--当前要查看第几页的记录
--输出参数
@recordcount int output,--总的记录的条数
@pagecount int output --总的页数
as
begin
--1.编写查询语句，把用户要的数据查询出来
select
t.fid,
t.fname,
t.fage,
t.fgender,
t.fmath,
t.fclassid,
t.fbirthday
from (select *,rn=row_number() over(order by fid asc) from MyStudent) as t
where t.rn between (@pageindex-1)*@pagesize+1 and @pagesize*@pageindex
--2.计算总的记录条数
set @recordcount=(select count(*) from MyStudent)
--3.计算总页数
set @pagecount=ceiling(@recordcount*1.0/@pagesize)
end
 
--调用前定义输出参数
declare @rc int,@pc int
exec usp_getMyStudentsDataByPage @pagesize=7,@pageindex=4, @recordcount=@rc output,@pagecount=@pc output
print @rc
print @pc

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
namespace _02通过Ado.Net调用存储过程
{
 public partial class Form1 : Form
 {
  public Form1()
  {
   InitializeComponent();
  }
  private int pageIndex = 1;//当前要查看的页码
  private int pageSize = 7;//每页显示的记录条数

  private int pageCount;//总页数
  private int recordCount;//总条数
  //窗体加载的时候显示第一页的数据
  private void Form1_Load(object sender, EventArgs e)
  {
   LoadData();
  }
  private void LoadData()
  {
   //根据pageIndex来加载数据
   string constr = "Data Source=steve-pc;Initial Catalog=itcast2014;Integrated Security=True";
   #region 1
   //using (SqlConnection conn = new SqlConnection(constr))
   //{
   // //将sql语句变成存储过程名称
   // string sql = "usp_getMyStudentsDataByPage";
   // using (SqlCommand cmd = new SqlCommand(sql, conn))
   // {
   //  //告诉SqlCommand对象，现在执行的存储过程不是SQL语句
   //  cmd.CommandType = CommandType.StoredProcedure;
   //  //增加参数(存储过程中有几个参数，这里就需要增加几个参数)
   //  //@pagesize int=7,--每页记录条数
   //  //@pageindex int=1,--当前要查看第几页的记录
   //  //@recordcount int output,--总的记录的条数
   //  //@pagecount int output --总的页数
   //  SqlParameter[] pms = new SqlParameter[] { 
   //  new SqlParameter("@pagesize",SqlDbType.Int){Value =pageSize},
   //  new SqlParameter("@pageindex",SqlDbType.Int){Value =pageIndex},
   //  new SqlParameter("@recordcount",SqlDbType.Int){ Direction=ParameterDirection.Output},
   //  new SqlParameter("@pagecount",SqlDbType.Int){Direction=ParameterDirection.Output}
   //  };
   //  cmd.Parameters.AddRange(pms);
   //  //打开连接
   //  conn.Open();
   //  //执行
   //using(SqlDataReader reader=cmd.ExecuteReader())
   //{
    //reader.Read()
   //}
   //pms[2].Value
   // }
   //}
   #endregion
   //DataAdapter方式
   DataTable dt = new DataTable();
   using (SqlDataAdapter adapter = new SqlDataAdapter("usp_getMyStudentsDataByPage", constr))
   {
    adapter.SelectCommand.CommandType = CommandType.StoredProcedure;
    SqlParameter[] pms = new SqlParameter[] { 
     new SqlParameter("@pagesize",SqlDbType.Int){Value =pageSize},
     new SqlParameter("@pageindex",SqlDbType.Int){Value =pageIndex},
     new SqlParameter("@recordcount",SqlDbType.Int){ Direction=ParameterDirection.Output},
     new SqlParameter("@pagecount",SqlDbType.Int){Direction=ParameterDirection.Output}
     };
    adapter.SelectCommand.Parameters.AddRange(pms);
    adapter.Fill(dt);
    //获取输出参数并且赋值给label
    label1.Text = "总条数：" + pms[2].Value.ToString();
    label2.Text = "总页数：" + pms[3].Value.ToString();
    label3.Text = "当前页：" + pageIndex;
    //数据绑定
    this.dataGridView1.DataSource = dt;
   }
  }
  //下一页
  private void button2_Click(object sender, EventArgs e)
  {
   pageIndex++;
   LoadData();
  }
  //上一页
  private void button1_Click(object sender, EventArgs e)
  {
   pageIndex--;
   LoadData();
  }
 }
}