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分页查询 效率最高

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Release: 2016-06-07 17:58:29
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给大家分享个效率最高的分页查询 5000万级别有效 比 ROWNUMBER 和Top效率高

代码如下:
/*

日期:2009-03-19
功能:根据各种条件获取 游戏国家任务 列表数据
*/
Create procedure [dbo].[PrGs_Nation_Task_GetList]

@PageSize int = 100, -- 每页显示记录条数,默认为100
@PageIndex int = 1, -- 当前提取要显示的页码,默认为1,数据库根据PageSize,PageIndex 计算返回一页数据

@RetTotal int output, -- 记录总数
@RetCount int output, -- 返回记录数
@RetPageIndex int output, -- 输出当前页码
@ReturnDesc varchar(128) output -- 返回操作结果描述
as
begin

set nocount on
set xact_abort on

set @RetTotal = 0
set @RetCount = 0
set @RetPageIndex = @PageIndex




-- 多条件取值
declare @Err int -- 错误
declare @PageCount int -- 总页数
declare @BeginRID int -- 开始行 Rid
declare @MaxRow int -- 最后行

select @RetTotal = count(*)
from NationTask

select @Err = @@ERROR

if @Err 0
begin
set @ReturnDesc = '提取国家任务总数失败!'
return -1
end

-- 如果无数据, 则返回空结果集
if @RetTotal = 0
begin
set @ReturnDesc = '当前条件无国家任务记录!'
return 1
end

-- 计算总页数
set @PageCount = @RetTotal / @PageSize

if @RetTotal % @PageSize > 0
begin
set @PageCount = @PageCount + 1
end

-- 超过总页数,则返回空结果集
if @PageIndex > @PageCount
begin
set @ReturnDesc = '当前条件无国家任务记录!'
return 1
end

-- 获取 要返回页面的 第一行纪录的 Rid
set @MaxRow = @PageSize * (@PageIndex - 1) + 1

set rowcount @MaxRow

select @BeginRID = Rid
from NationTask
order by Rid desc


-- 返回数据列表
set rowcount @PageSize

select Rid
,TaskName
,TaskTitle
,ImageID
,EffectID
,StartTime
from NationTask
where Rid order by Rid desc

set @RetCount = @@rowcount

-- 结束
set @ReturnDesc = '提取国家任务列表成功!'
return 1
end
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