C# MySql分页存储过程的应用
存储过程:
获取范围内的数据
DELIMITER $$ DROP PROCEDURE IF EXISTS `studb`.`GetRecordAsPage` $$ CREATE PROCEDURE `studb`.`GetRecordAsPage` (in tbName varchar(800),in fldName varchar(1000), in strWhere varchar(500),in pageIndex int,in pageSize int,in orderType int,in sortName varchar(50)) BEGIN declare startRow int; declare sqlStr varchar(1000); declare limitTemp varchar(1000); declare orderTemp varchar(1000); set startRow = (pageIndex-1)*pageSize; set sqlStr = CONCAT('SELECT ',fldName,' from ',tbName); set limitTemp = CONCAT(' limit ',startRow,',',pageSize); set orderTemp = CONCAT(' order by ',sortName); if orderType = 0 then set orderTemp = CONCAT(orderTemp,' ASC '); else set orderTemp = CONCAT(orderTemp,' DESC '); end if; set @sqlString = CONCAT(sqlStr,' ',strWhere,orderTemp,limitTemp); prepare sqlstmt from @sqlString; execute sqlstmt; deallocate prepare sqlstmt; END $$ DELIMITER ;
获取条件下的总记录数据
DELIMITER $$ DROP PROCEDURE IF EXISTS `GetRecordCount` $$ -- --CREATE DEFINER=`root`@`localhost` PROCEDURE `GetRecordCount`(in tbName varchar(800),in strWhere varchar(500)) CREATE PROCEDURE `GetRecordCount`(in tbName varchar(800),in strWhere varchar(500)) BEGIN set @strSQL=concat('select count(*) as countStr from ',tbName,strWhere); prepare sqlstmt from @strSQL; execute sqlstmt; deallocate prepare sqlstmt; END $$ DELIMITER ;
测试
建表语句
CREATE TABLE `uinfo` ( `id` int(11) NOT NULL AUTO_INCREMENT COMMENT 'id', `iduse` varchar(200) DEFAULT NULL COMMENT '用户编号', `uname` varchar(200) DEFAULT NULL COMMENT '用户名称', `email` varchar(200) DEFAULT NULL COMMENT 'Email', PRIMARY KEY (`id`) ) ENGINE=MyISAM AUTO_INCREMENT=5 DEFAULT CHARSET=latin1
测试脚本
SELECT `id` , `iduse` , `uname` , `email` FROM `mostimpressive_dscj`.`uinfo`; SET @tbName='uinfo'; -- -- 表名 SET @fldName='iduse,uname,email';-- -- 表的列名 SET @strWhere = ''; -- -- 查询条件 SET @pageIndex=1;-- -- 第几页 传入1就是显示第一页 SET @pageSize=5;-- -- 一页显示几条记录 SET @orderType=0; -- --0是升序 非0是降序 SET @sortName='id'; -- -- 排序字段 CALL Dscj_GetPaged('uinfo','iduse,uname,email','',1,1,1,'id') -- --SELECT iduse,uname,email from uinfo order by id ASC limit 0,4 -- --传入表名，返回总的记录条数 CALL GetRecordCount('uinfo','')
C#程序
protected void get_data() { string strWhere = " where idmde='" + DropDownList1.SelectedValue + "' and idmke='" + DropDownList2.SelectedValue + "'"; string fldName = "iduse,uname,email,euser,werks"; int pageSize = 5; int pageCount = 1; int pageCountMod = 0; int doCount = 0; int pageIndex = System.Convert.ToInt32(pageIndexLab.Text.ToString()); myco = new MySqlConnection(strconn); myco.Open(); mycomm = new MySqlCommand("GetRecordCount", myco); mycomm.CommandType = CommandType.StoredProcedure; MySqlParameter[] para = new MySqlParameter[]{ new MySqlParameter("@tbName",MySqlDbType.VarChar,20), new MySqlParameter("@strWhere",MySqlDbType.VarChar,500)}; para[0].Value = "uinfo"; para[1].Value = strWhere; mycomm.Parameters.AddRange(para); MySqlDataReader mydr=mycomm.ExecuteReader(); while(mydr.Read()){ pageCount = System.Convert.ToInt32(mydr["countStr"].ToString()) ; pageCountMod = pageCount % pageSize; pageCount= pageCount/ pageSize; if (pageCount == 0) { //pageCount++; } else { if (pageCountMod != 0) { pageCount++; } } pageCountLab.Text = pageCount.ToString(); } if (pageIndex == 0) { pageIndex++; } mydr.Close(); mycomm.Dispose(); mycomm = new MySqlCommand("GetRecordAsPage", myco); mycomm.CommandType = CommandType.StoredProcedure; para.Initialize(); para = new MySqlParameter[]{ new MySqlParameter("@tbName",MySqlDbType.VarChar,20), new MySqlParameter("@fldName",MySqlDbType.VarChar,1000), new MySqlParameter("@strWhere",MySqlDbType.VarChar,500), new MySqlParameter("@pageIndex",MySqlDbType.Int32), new MySqlParameter("@pageSize",MySqlDbType.Int32), new MySqlParameter("@orderType",MySqlDbType.Int16), new MySqlParameter("@sortName",MySqlDbType.VarChar,50)}; para[0].Value = "uinfo"; para[1].Value = fldName; para[2].Value = strWhere; para[3].Value = pageIndex; para[4].Value = pageSize; para[5].Value = 0; para[6].Value = "iduse"; mycomm.Parameters.AddRange(para); MySqlDataAdapter myAdapter = new MySqlDataAdapter(mycomm); DataSet myDataSet = new DataSet(); DataView m_DataView = new DataView(); myAdapter.Fill(myDataSet); m_DataView = myDataSet.Tables[0].DefaultView; GridView1.DataSource = m_DataView; GridView1.DataBind(); GridView2.DataSource = m_DataView; GridView2.DataBind(); GridView3.DataSource = m_DataView; GridView3.DataBind(); DropDownpage.Items.Clear(); if (pageCount != 0) { doCount = 0; while (doCount < pageCount) { doCount++; DropDownpage.Items.Add(new ListItem(doCount.ToString()+"页", doCount.ToString())); } } if (pageIndex == 1) { Button_IndexFirst.Enabled = false; Button_IndexPrevious.Enabled = false; Button_IndexNext.Enabled = true; Button_IndexLast.Enabled = true; } else if (pageIndex == pageCount) { Button_IndexFirst.Enabled = true; Button_IndexPrevious.Enabled = true; Button_IndexNext.Enabled = false; Button_IndexLast.Enabled = false; } else { Button_IndexFirst.Enabled = true; Button_IndexPrevious.Enabled = true; Button_IndexNext.Enabled = true; Button_IndexLast.Enabled = true; } if (pageCount == 0 || pageCount == 1) { pageIndex = pageCount; Button_IndexFirst.Enabled = false; Button_IndexPrevious.Enabled = false; Button_IndexNext.Enabled = false; Button_IndexLast.Enabled = false; DropDownpage.Enabled = false; } else { DropDownpage.Enabled = true; } pageIndexLab.Text = pageIndex.ToString(); if (pageIndex != 0) { DropDownpage.SelectedItem.Selected = false; DropDownpage.Items.FindByValue(pageIndex.ToString()).Selected = true; } myco.Close(); } protected void Button_IndexFirst_Click(object sender, EventArgs e) { pageIndexLab.Text = "1"; if (pageCountLab.Text.Equals("0")) { pageIndexLab.Text = "0"; } get_data(); } protected void Button_IndexPrevious_Click(object sender, EventArgs e) { int pageIndex = System.Convert.ToInt32(pageIndexLab.Text.ToString()); pageIndex--; if (pageIndex < 0) { pageIndex = 0; } pageIndexLab.Text = pageIndex.ToString(); get_data(); } protected void Button_IndexNext_Click(object sender, EventArgs e) { int pageIndex = System.Convert.ToInt32(pageIndexLab.Text.ToString()); int pageCount = System.Convert.ToInt32(pageCountLab.Text.ToString()); pageIndex++; if (pageIndex > pageCount) { pageIndex = pageCount; } pageIndexLab.Text = pageIndex.ToString(); get_data(); } protected void Button_IndexLast_Click(object sender, EventArgs e) { int pageIndex = System.Convert.ToInt32(pageIndexLab.Text.ToString()); int pageCount = System.Convert.ToInt32(pageCountLab.Text.ToString()); pageIndex = pageCount; pageIndexLab.Text = pageIndex.ToString(); get_data(); } protected void DropDownpage_SelectedIndexChanged(object sender, EventArgs e) { pageIndexLab.Text = DropDownpage.SelectedValue; get_data(); }