SqlServer 數(shù)據(jù)分頁的存儲過程- -
SQL Server 存儲過程的分頁,這個問題已經討論過幾年了,很多朋友在問我,所以在此發(fā)表一下我的觀點 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
插入數(shù)據(jù):(2萬條,用更多的數(shù)據(jù)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
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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(shù) id FROM 表 ORDER BY id)) ORDER BY ID
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分頁方案二:(利用ID大于多少和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(shù) id FROM 表 ORDER BY id) AS T)) ORDER BY ID -------------------------------------
分頁方案三:(利用SQL的游標存儲過程分頁) create procedure XiaoZhengGe @sqlstr nvarchar(4000), --查詢字符串 @currentpage int, --第N頁 @pagesize int --每頁行數(shù) as set nocount on declare @P1 int, --P1是游標的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(shù)--,@rowcount as 總行數(shù),@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,可以用臨時表,也可以用方案三做,但是效率會低。 建議優(yōu)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大于多少和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的游標存儲過程分頁) 效率最差,但是最為通用
在實際情況中,要具體分析。
以下是另一個存儲過程的例子.
通常用普通的SQL語句查詢數(shù)據(jù),在數(shù)據(jù)量少的情況下速度上沒什么感覺,一旦數(shù)居量很大之后,速度會明顯變慢,因為大量的數(shù)據(jù)在網絡中傳輸會花掉不少的時間,如果使用了分頁查詢數(shù)據(jù),只反回有用的數(shù)據(jù),把不需要的數(shù)據(jù)排除后,傳輸速度會快很多,如下是一個SQL分頁的存儲過程,本過程是以SQL自帶的 Northwind 數(shù)據(jù)庫為例寫的,可以根據(jù)自已的需要隨意更改
CREATE PROCEDURE [GetCustomersDataPage] @PageIndex INT, --頁號 @PageSize INT, --頁數(shù) @RecordCount INT OUT, --記錄數(shù) @PageCount INT OUT --頁數(shù) AS SELECT @RecordCount = COUNT(*) FROM Customers SET @PageCount = CEILING(@RecordCount * 1.0 / @PageSize)
DECLARE @SQLSTR NVARCHAR(1000)
IF @PageIndex = 0 OR @PageCount <= 1 SET @SQLSTR =‘SELECT TOP ‘+STR( @PageSize )+‘ CustomerID, CompanyName,Address,Phone FROM Customers ORDER BY CustomerID DESC‘
ELSE IF @PageIndex = @PageCount - 1 SET @SQLSTR =‘ SELECT * FROM ( SELECT TOP ‘+STR( @RecordCount - @PageSize * @PageIndex )+‘ CustomerID, CompanyName,Address,Phone FROM Customers ORDER BY CustomerID ASC ) TempTable ORDER BY CustomerID DESC‘
ELSE SET @SQLSTR =‘ SELECT TOP ‘+STR( @PageSize )+‘ * FROM ( SELECT TOP ‘+STR( @RecordCount - @PageSize * @PageIndex )+‘ CustomerID, CompanyName,Address,Phone FROM Customers ORDER BY CustomerID ASC ) TempTable ORDER BY CustomerID DESC‘
EXEC (@SQLSTR)
GO
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