sql分页
-- 获取指定页的数据
Create PROCEDURE page
@tblName varchar(255), -- 表名
@strGetFields varchar(1000) = '*', -- 需要返回的列
@fldName varchar(255)='', -- 排序的字段名
@PageSize int = 10, -- 页尺寸
@PageIndex int = 1, -- 页码
@doCount bit = 0, -- 返回记录总数, 非 0 值则返回
@OrderType bit = 0, -- 设置排序类型, 非 0 值则降序
@strWhere varchar(1500) = '' -- 查询条件 (注意: 不要加 where)
AS
declare @strSQL varchar(5000) -- 主语句
declare @strTmp varchar(110) -- 临时变量
declare @strOrder varchar(400) -- 排序类型
if @doCount != 0
begin
if @strWhere !=''
set @strSQL = 'select count(*) as Total from [' + @tblName + '] where '+@strWhere
else
set @strSQL = 'select count(*) as Total from [' + @tblName + ']'
end
--以上代码的意思是如果@doCount传递过来的不是0,就执行总数统计。以下的所有代码都是@doCount为0的情况
else
begin
if @OrderType != 0
begin
set @strTmp = '<(select min'
set @strOrder = ' order by [' + @fldName +'] desc'
--如果@OrderType不是0,就执行降序,这句很重要！
end
else
begin
set @strTmp = '>(select max'
set @strOrder = ' order by [' + @fldName +'] asc'
end
if @PageIndex = 1
begin
if @strWhere != ''
set @strSQL = 'select top ' + str(@PageSize) +' '+@strGetFields+ ' from [' + @tblName + '] where ' + @strWhere + ' ' + @strOrder
else
set @strSQL = 'select top ' + str(@PageSize) +' '+@strGetFields+ ' from ['+ @tblName + '] '+ @strOrder
--如果是第一页就执行以上代码,这样会加快执行速度
end
else
begin
--以下代码赋予了@strSQL以真正执行的SQL代码
set @strSQL = 'select top ' + str(@PageSize) +' '+@strGetFields+ ' from ['
+ @tblName + '] where [' + @fldName + ']' + @strTmp + '(['+ @fldName + ']) from (select top ' + str((@PageIndex-1)*@PageSize) + ' ['+ @fldName + '] from [' + @tblName + ']' + @strOrder + ') as tblTmp)'+ @strOrder
if @strWhere != ''
set @strSQL = 'select top ' + str(@PageSize) +' '+@strGetFields+ ' from ['
+ @tblName + '] where [' + @fldName + ']' + @strTmp + '(['
+ @fldName + ']) from (select top ' + str((@PageIndex-1)*@PageSize) + ' ['
+ @fldName + '] from [' + @tblName + '] where ' + @strWhere + ' '
+ @strOrder + ') as tblTmp) and ' + @strWhere + ' ' + @strOrder
end
end
exec (@strSQL)
GO
private string strConn = ConfigurationSettings.AppSettings["db_11"];
public int recordNum; // 记录数
public int pageIndex; // 目前所在页
public int pageNum; // 总页数
public int pageEach = 8; // 每页记录数
private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
pageIndex = Convert.ToInt32(Request.QueryString["pageIndex"]);
// 绑定
DataSet ds = new DataSet();
string strSQL = "exec GetData '表','字段','条件','排序字段','升序/降序','" + pageEach + "','" + pageIndex + "','0'";
SqlDataAdapter cmd = new SqlDataAdapter(strSQL,strConn);
cmd.Fill(ds);
parent.DataSource = ds.Tables[0].DefaultView;
Page.DataBind();
// 总页码
strSQL = "exec GetData '表','','条件','','','','','1'";
BaBaoDB db = new BaBaoDB();
SqlDataReader reader = db.SelectReader(strSQL);
if(reader.Read())
{
recordNum = Convert.ToInt32(reader[0]);
if(recordNum == 0)
{
// 无记录的情况
pageNum = pageIndex;
}
else
{
if(recordNum % pageEach == 0)
{
pageNum = recordNum / pageEach;
}
else
{
pageNum = recordNum / pageEach + 1;
}
}
}
else
{
pageNum = pageIndex;
}
reader.Close();
}
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在ms sql server 中，可以充分利用存储过程进行分页的优化，下面是一个不错的例子，其中充分利用了
set rowcount的功能。存储过程中，可以向@startrowindex传入第N页的页码，@maximumrow是每页的记录条数
CREATE PROCEDURE [usp_GetProducts]
@startRowIndex int,
@maximumRows int,
@totalRows int OUTPUT
AS
DECLARE @first_id int, @startRow int
SET @startRowIndex = (@startRowIndex - 1) * @maximumRows+1
SET ROWCOUNT @startRowIndex
SELECT @first_id = ProductID FROM Products ORDER BY ProductID
PRINT @first_id
SET ROWCOUNT @maximumRows
SELECT ProductID, ProductName FROM Products WHERE
ProductID >= @first_id
ORDER BY ProductID
SET ROWCOUNT 0
-- GEt the total rows
SELECT @totalRows = COUNT(ProductID) FROM Products
GO
--分页存储过程(效率高,试过100万的数据,游标分页)
CREATE procedure cursorPage
@sqlstr nvarchar(4000), --查询字符串
@currentpage int, --第N页
@pagesize int --每页行数
as
set nocount on
declare @P1 int, --P1是游标的id
@rowcount int
exec sp_cursoropen @P1 output,@sqlstr,@scrollopt=1,@ccopt=1,@rowcount=@rowcount output
select ceiling(1.0*@rowcount/@pagesize) as 总页数,@rowcount as 总行数,@currentpage as 当前页
set @currentpage=(@currentpage-1)*@pagesize+1
exec sp_cursorfetch @P1,16,@currentpage,@pagesize
exec sp_cursorclose @P1
set nocount off
GO
--调用:示例exec cursorPage 'select * from dingdan','1','10'