电脑技术学习

实现上千万条数据的分页显示

dn001

-- 获取指定页的数据
CREATE PROCEDURE GetRecordFromPage
@tblName;;;varchar(255),;;;;-- 表名
@fldName;;;varchar(255),;;;;-- 字段名
@PageSize;;int = 10,-- 页尺寸
@PageIndex;int = 1,;-- 页码
@IsCount;;;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(1000) = ''; -- 查询条件 (注意: 不要加 where)
AS

declare @strSQLvarchar(6000);;;;-- 主语句
declare @strTmpvarchar(100);;;;;-- 临时变量
declare @strOrder varchar(400);;;;;-- 排序类型

if @OrderType != 0
begin
set @strTmp = "<(select min"
set @strOrder = " order by [" + @fldName +"] desc"
end
else
begin
set @strTmp = ">(select max"
set @strOrder = " order by [" + @fldName +"] asc"
end

set @strSQL = "select top " + str(@PageSize) + " * 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) + " * from ["
+ @tblName + "] where [" + @fldName + "]" + @strTmp + "(["
+ @fldName + "]) from (select top " + str((@PageIndex-1)*@PageSize) + " ["
+ @fldName + "] from [" + @tblName + "] 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) + " * from ["
+ @tblName + "]" + @strTmp + " " + @strOrder
end

if @IsCount != 0
set @strSQL = "select count(*) as Total from [" + @tblName + "]"

exec (@strSQL)

GO