SQL Server 預存程序的分頁方案

建立表：

CREATE TABLE [TestTable] (
 [ID] [int] IDENTITY (1, 1) NOT NULL ,
 [FirstName] [nvarchar] (100) COLLATE Chinese_PRC_CI_AS NULL ,
 [LastName] [nvarchar] (100) COLLATE Chinese_PRC_CI_AS NULL ,
 [Country] [nvarchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,
 [Note] [nvarchar] (2000) COLLATE Chinese_PRC_CI_AS NULL
) ON [PRIMARY]
GO

 

插入資料：(2萬條，用更多的資料測試會明顯一些)
SET IDENTITY_INSERT TestTable ON

declare @i int
set @i=1
while @i<=20000
begin
    insert into TestTable([id], FirstName, LastName, Country,Note) values(@i, 'FirstName_XXX','LastName_XXX','Country_XXX','Note_XXX')
    set @i=@i+1
end

SET IDENTITY_INSERT TestTable OFF

 

-------------------------------------

分頁方案一：(利用Not In和SELECT TOP分頁)
語句形式：
SELECT TOP 10 *
FROM TestTable
WHERE (ID NOT IN
          (SELECT TOP 20 id
         FROM TestTable
         ORDER BY id))
ORDER BY ID

SELECT TOP 頁大小 *
FROM TestTable
WHERE (ID NOT IN
          (SELECT TOP 頁大小*頁數 id
         FROM 表
         ORDER BY id))
ORDER BY ID

-------------------------------------

分頁方案二：(利用ID大於多少和SELECT TOP分頁）
語句形式：
SELECT TOP 10 *
FROM TestTable
WHERE (ID >
          (SELECT MAX(id)
         FROM (SELECT TOP 20 id
                 FROM TestTable
                 ORDER BY id) AS T))
ORDER BY ID

SELECT TOP 頁大小 *
FROM TestTable
WHERE (ID >
          (SELECT MAX(id)
         FROM (SELECT TOP 頁大小*頁數 id
                 FROM 表
                 ORDER BY id) AS T))
ORDER BY ID

-------------------------------------

分頁方案三：(利用SQL的遊標預存程序分頁)
create  procedure XiaoZhengGe
@sqlstr nvarchar(4000), --查詢字串
@currentpage int, --第N頁
@pagesize int --每頁行數
as
set nocount on
declare @P1 int, --P1是遊標的id
 @rowcount int
exec sp_cursoropen @P1 output,@sqlstr,@scrollopt=1,@ccopt=1,@rowcount=@rowcount output
select ceiling(1.0*@rowcount/@pagesize) as 總頁數--,@rowcount as 總行數,@currentpage as 當前頁 
set @currentpage=(@currentpage-1)*@pagesize+1
exec sp_cursorfetch @P1,16,@currentpage,@pagesize
exec sp_cursorclose @P1
set nocount off

其它的方案：如果沒有主鍵，可以用暫存資料表，也可以用方案三做，但是效率會低。
建議最佳化的時候，加上主鍵和索引，查詢效率會提高。

通過SQL 查詢分析器，顯示比較：我的結論是:
分頁方案二：(利用ID大於多少和SELECT TOP分頁）效率最高，需要拼接SQL語句
分頁方案一：(利用Not In和SELECT TOP分頁)   效率次之，需要拼接SQL語句
分頁方案三：(利用SQL的遊標預存程序分頁)    效率最差，但是最為通用

在實際情況中，要具體分析。

ALTER PROCEDURE dbo.GetPageRecord
(
@tblName varchar(255), -- 表名
@fldName varchar(255), --排序欄位
@KeyField varchar(255), --主鍵
@PageSize int = 10, -- 頁尺寸
@PageIndex int = 1, -- 頁碼
@IsCount bit = 0, -- 返回記錄總數, 非 0 值則返回
@OrderType bit = 1, -- 設定排序類型, 非 0 值則降序
@strWhere varchar(4000) = '' -- 查詢條件 (注意: 不要加 where)
)
AS
SET NOCOUNT ON
DECLARE @PageLowerBound int
DECLARE @PageUpperBound int

-- Set the page bounds
SET @PageLowerBound = @PageSize * @PageIndex
SET @PageUpperBound = @PageLowerBound + @PageSize + 1

-- Create a temp table to store the select results
CREATE TABLE #tmp
(
RecNo int IDENTITY (1, 1) NOT NULL,
oldid int
)
--generate record
Declare @Sqlstr varchar(6000)
set @sqlstr='select '+@Keyfield+' from '+@tblname
if(@strWhere<>'')
begin
set @Sqlstr=@sqlstr+' where ('+@strWhere+')'
end
set @sqlstr=@sqlstr+' order by '+@fldName
if(@ordertype=0)
begin
set @sqlstr=@sqlstr+' asc'
end
else
begin
set @sqlstr=@sqlstr+' desc'
end
set @sqlstr='insert into #tmp (oldid) '+@sqlstr
execute(@sqlstr)
set @sqlstr='SELECT TableA.* FROM '+@tblname+' TableA (nolock), #tmp T WHERE T.oldid = TableA.'+@keyfield+' AND T.RecNo > '+ cast(@PageLowerBound as varchar)+' AND T.RecNo < '+cast(@PageUpperBound as varchar)+' ORDER BY T.RecNo'
execute(@sqlstr)

 

ALTER PROCEDURE dbo.GetPageRecord
(
@tblName varchar(255), -- 表名
@fldName varchar(255), --排序欄位
@KeyField varchar(255), --主鍵
@PageSize int = 10, -- 頁尺寸
@PageIndex int = 1, -- 頁碼
@IsCount bit = 0, -- 返回記錄總數, 非 0 值則返回
@OrderType bit = 1, -- 設定排序類型, 非 0 值則降序
@strWhere varchar(4000) = '' -- 查詢條件 (注意: 不要加 where)
)
AS
SET NOCOUNT ON
DECLARE @PageLowerBound int
DECLARE @PageUpperBound int

-- Set the page bounds
SET @PageLowerBound = @PageSize * @PageIndex
SET @PageUpperBound = @PageLowerBound + @PageSize + 1

-- Create a temp table to store the select results
CREATE TABLE #tmp
(
RecNo int IDENTITY (1, 1) NOT NULL,
oldid int
)
--generate record
Declare @Sqlstr varchar(6000)
set @sqlstr='select '+@Keyfield+' from '+@tblname
if(@strWhere<>'')
begin
set @Sqlstr=@sqlstr+' where ('+@strWhere+')'
end
set @sqlstr=@sqlstr+' order by '+@fldName
if(@ordertype=0)
begin
set @sqlstr=@sqlstr+' asc'
end
else
begin
set @sqlstr=@sqlstr+' desc'
end
set @sqlstr='insert into #tmp (oldid) '+@sqlstr
execute(@sqlstr)
set @sqlstr='SELECT TableA.* FROM '+@tblname+' TableA (nolock), #tmp T WHERE T.oldid = TableA.'+@keyfield+' AND T.RecNo > '+ cast(@PageLowerBound as varchar)+' AND T.RecNo < '+cast(@PageUpperBound as varchar)+' ORDER BY T.RecNo'
execute(@sqlstr)

(原創李宏根)