SQL Server2005的几种分页方法
2011-03-21 08:26
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本文的几种分页方法摘自《SQL Server2005性能调优》一书。用以下脚本生成测试数据:
1、 基于CTE分页
1)、用row_number()排名函数,派生表的方式分页
2)、用CTE方式取代派生表
3)、也是CTE方法,但是根据测试数据显示这种性能比前两种都好
2、 基于ROW_COUNT的分页
3、 TOP @X分页
SQL Server 2005中可以把返回行数做为参数传给top语句。
4、 Temp表分页
CREATE TABLE TRANS_TABLE( MYID INT IDENTITY(1,1) NOT NULL PRIMARY KEY, MYDESC VARCHAR(10), MYDATE DATETIME, MYGROUPID INT) DECLARE @I INT SET @I = 0 WHILE @I < 1000000 BEGIN INSERT INTO TRANS_TABLE SELECT CHAR(ASCII('A') - 2 + (2 * (1 + ABS(CHECKSUM(NEWID())) % 26))), DATEADD(day, ABS(CHECKSUM(NEWID())) % 365, '01/01/2007'), (ABS(CHECKSUM(NEWID())) % 10) SET @I = @I + 1 END CREATE NONCLUSTERED INDEX IX_TRANS_TABLE_MYDATE ON TRANS_TABLE(MYDATE) CREATE NONCLUSTERED INDEX IX_TRANS_TABLE_MYGROUPID ON TRANS_TABLE(MYGROUPID)
1、 基于CTE分页
1)、用row_number()排名函数,派生表的方式分页
DECLARE @START_ID int, @START_ROW int, @MAX_ROWS int SELECT @START_ROW = 1, @MAX_ROWS = 25 select * from ( select p.*, rownum rnum FROM ( SELECT ROW_NUMBER() OVER(ORDER BY MyDate, MYID) AS rowNum, * FROM TRANS_TABLE (NOLOCK) ) p where rownum <= @START_ROW + @MAX_ROWS - 1 ) z where rnum >= @START_ROW
2)、用CTE方式取代派生表
DECLARE @START_ROW int, @MAX_ROWS int, @TOT_ROW_CNT int SELECT @START_ROW = 1, @MAX_ROWS = 25; WITH PAGED AS ( SELECT ROW_NUMBER() OVER(ORDER BY MyDate, MYID) AS rowNum, * FROM TRANS_TABLE (NOLOCK) ) SELECT * FROM PAGED WHERE ROWNUM BETWEEN @START_ROW AND @START_ROW + @MAX_ROWS-1
3)、也是CTE方法,但是根据测试数据显示这种性能比前两种都好
DECLARE @START_ROW int, @MAX_ROWS int, @TOT_ROW_CNT int SELECT @START_ROW = 1, @MAX_ROWS = 25; WITH PAGED AS ( SELECT ROW_NUMBER() OVER(ORDER BY MyDate, MYID) AS rowNum, MYID FROM TRANS_TABLE (NOLOCK) ) SELECT TT.* FROM PAGED PGD INNER JOIN TRANS_TABLE TT ON PGD.MYID = TT.MYID WHERE ROWNUM BETWEEN @START_ROW AND @START_ROW + @MAX_ROWS - 1 ORDER BY MyDate, MYID
2、 基于ROW_COUNT的分页
DECLARE @START_ID int, @START_ROW int, @MAX_ROWS int, @START_DATETIME DATETIME, @TOT_ROW_CNT INT SELECT @START_ROW = 1, @MAX_ROWS = 25 -- Get the first row for the page SET ROWCOUNT @START_ROW SELECT @START_ID = MYID, @START_DATETIME = MYDATE FROM TRANS_TABLE (NOLOCK) ORDER BY MYDATE, MYID -- Now, set the row count to MaximumRows and get -- all records >= @first_id SET ROWCOUNT @MAX_ROWS SELECT * FROM TRANS_TABLE (NOLOCK) WHERE MYID >= @START_ROW AND MYDATE >= @START_DATETIME ORDER BY MYDATE, MYID SET ROWCOUNT 0
3、 TOP @X分页
SQL Server 2005中可以把返回行数做为参数传给top语句。
DECLARE @START_ID int, @START_ROW int, @MAX_ROWS int, @TOT_ROW_CNT INT, @START_DESC VARCHAR(10) SELECT @START_ROW = 1, @MAX_ROWS = 25 -- Get the first row for the page SELECT TOP(@START_ROW) @START_ID = MYID, @START_DESC = MYDESC FROM TRANS_TABLE (NOLOCK) ORDER BY MYDESC, MYID SELECT TOP(@MAX_ROWS) * FROM TRANS_TABLE (NOLOCK) WHERE MYID >= @START_ROW AND MYDESC >= @START_DESC ORDER BY MYDESC, MYID
4、 Temp表分页
DECLARE @START_ROW int, @MAX_ROWS int, @TOT_ROW_CNT int SELECT @START_ROW = 1, @MAX_ROWS = 25; SELECT ROW_NUMBER() OVER(ORDER BY MyDate, MYID) AS rowNum, MYID into #TEMP FROM TRANS_TABLE (NOLOCK) SELECT TT.* FROM TRANS_TABLE (NOLOCK) TT INNER JOIN #TEMP T ON TT.MYID = T.MYID WHERE ROWNUM BETWEEN @START_ROW AND @START_ROW + @MAX_ROWS - 1 DROP TABLE #TEMP
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