千万级高性能分页存储过程
(原文来自于海乐学习-http://www.cnblogs.com/hailexuexi/archive/2010/07/25/1784508.html)
Create procedure [dbo].[QueryPagination]
@TableName varchar(1000), -- 表名
@SelectFieldName varchar(4000), -- 要显示的字段名(不要加select)
@strWhere varchar(4000), -- 查询条件(注意: 不要加 where)
@OrderFieldName varchar(255), -- 排序索引字段名
@OrderType bit = 0 , -- 设置排序类型, 非 0 值则降序
@PageSize int , -- 页大小
@PageIndex int = 1, -- 页码
@iRowCount int output -- 返回记录总数
AS
declare @strSQL varchar(4000) -- 主语句
declare @strTmp varchar(4000) -- 临时变量
declare @strOrder varchar(400) -- 排序类型
declare @strRowCount nvarchar(4000) -- 用于查询记录总数的语句
set @OrderFieldName=ltrim(rtrim(@OrderFieldName))
if @OrderType != 0
begin
set @strTmp = '<(select min'
set @strOrder = ' order by ' + @OrderFieldName +' desc'
end
else
begin
set @strTmp = '>(select max'
set @strOrder = ' order by ' + @OrderFieldName +' asc'
end
set @strSQL = 'select top ' + str(@PageSize) + @SelectFieldName+' from '
+ @TableName + ' where ' + @OrderFieldName + @strTmp + '('
+ right(@OrderFieldName,len(@OrderFieldName)-charindex('.',@OrderFieldName)) + ') from (select top ' + str((@PageIndex-1)*@PageSize)
+ @OrderFieldName + ' from ' + @TableName + @strOrder + ') as tblTmp)'
+ @strOrder
if @strWhere != ''
set @strSQL = 'select top ' + str(@PageSize) + @SelectFieldName+' from '
+ @TableName + ' where ' + @OrderFieldName + @strTmp + '('
+ right(@OrderFieldName,len(@OrderFieldName)-charindex('.',@OrderFieldName)) + ') from (select top ' + str((@PageIndex-1)*@PageSize)
+ @OrderFieldName + ' from ' + @TableName + ' where ' + @strWhere + ' '
+ @strOrder + ') as tblTmp) and ' + @strWhere + ' ' + @strOrder
if @PageIndex = 1
begin
set @strTmp = ''
if @strWhere != ''
set @strTmp = ' where ' + @strWhere
set @strSQL = 'select top ' + str(@PageSize) + @SelectFieldName+' from '
+ @TableName + @strTmp + ' ' + @strOrder
end
exec(@strSQL)
if @strWhere!=''
begin
set @strRowCount = 'select @iRowCount=count(*) from ' + @TableName+' where '+@strWhere
end
else
begin
set @strRowCount = 'select @iRowCount=count(*) from ' + @TableName
end
exec sp_executesql @strRowCount,N'@iRowCount int out',@iRowCount out
