2个高效存储过程分页及对比
前两天在网上发现了一条存储过程分页的例子,是利用mssql2005中新添加的函数ROW_NUMBER()来实现的,于是修改了下并且和以前用游标的分页函数进行了以下对比,下面分别将两个存储过程写下来。
1、使用ROW_NUMBER()的方法来实现:
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/*-----------------------------------------------------------------
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模块:分页查询存储过程
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2008/03/10 创建 郑玉路
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-------------------------------------------------------------------*/
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CREATE PROCEDURE PAGINATION_FUNCTION
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(
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@strTable VARCHAR(1500) = '', -- 表名-FROM以后的字符串 例:(单表)ORDERS\(多表)ORDERS LEFT JION CUSTOMER ON ORDERS.CUSTOMERID = ORDERS.CUSTOMERID
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@strReturn VARCHAR(1500) = '*', -- 需要返回的列 例:ORDERID,CUSTOMERID
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@strOrderBy VARCHAR(1000)='', -- 排序的字段名 orderdate asc,shippeddate desc
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@PageSize INT = 10, -- 一页的记录数大小
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@PageIndex INT = 1, -- 当前页页码
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@doCount INT = 0 output -- 返回记录总数
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)
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AS
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-- 获取总记录数
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DECLARE @tpSEL NVARCHAR(4000) -- 获取总记录数临时语句
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SET @tpSEL = N'SELECT @doCount=COUNT(*) FROM ' + rtrim(@strTable)
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EXEC sp_executesql @tpSEL, N'@doCount int output',@doCount output
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-- 获取总记录数
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DECLARE @tpSEL2 VARCHAR(8000)
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DECLARE @RowStart INT -- 开始行标记
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DECLARE @RowEnd INT -- 结束行标记
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SET @RowStart = @PageSize * @PageIndex - @PageSize + 1
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SET @RowEnd = @PageSize * @PageIndex
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SET @tpSEL2 = 'SELECT * FROM ( SELECT ROW_NUMBER() OVER(ORDER BY ' + rtrim(@strOrderBy)
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+ ') AS ROWS, ' + rtrim(@strReturn)
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+ ' FROM ' + rtrim(@strTable)
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+ ') AS TEMP WHERE ROWS BETWEEN ' + rtrim(@RowStart)
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+ ' AND ' + rtrim(@RowEnd)
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EXEC (@tpSEL2)
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RETURN
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2、游标方式:
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然后分别对15000条的数据进行测试,发现2个存储过程的耗时几乎一样,第一种方法的耗时相对要比第二种稍微快几毫秒,而且不管是查询第几页的数据基本上比较稳定,只是相对的使用起来没有第二种方法方便,但是对于百万条以上的数据的效果如何确没有进行测试,具体哪种方法更好还不得而知,而且哪位朋友如果方便的话可以帮忙修改下相应的不足之处,同时还有一个比较头痛的问题,就是再使用EXEC SP_EXECUTESQL @TPSEL...这个方法的时候,变量@TPSEL不能声明为varchar类型,只能为nvarchar,这个问题具体是因为什么我还没有查到原因!