首先說明一下我這個存儲過程的功能：

根據(jù)不同的查詢條件組合進行查詢數(shù)據(jù)，數(shù)據(jù)庫中有項目信息表Project

有項目區(qū)域表ProjectArea

項目信息表Project和項目區(qū)域表的關聯(lián)是通過ProjectArea和AreaID進行一對一關聯(lián)，項目區(qū)域信息中的信息有所屬關系，我們可以把它理解成一個樹形結(jié)構(gòu)

下面是存儲過程對應的查詢界面和結(jié)果展示界面：查詢條件有項目編號、項目名稱、業(yè)務類型、項目區(qū)域、項目起止時間

下面是存儲過程

看了之后是否覺得很復雜，這就是我今天寫的一個比較難的存儲過程

?

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

-- Function: Select a record from table PropertyT

-- Date Created: 2015年月日

-- Created By:?? lijinchang

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

--這些是查詢條件(綠色部分)

ALTER PROCEDURE [dbo].[Lijc_GetProjectInfor]

??? @PageSize int,

??? @PageIndex int,

??? @recordCount int output,

??? @ProjectNo varchar(100)=null,

??? @ProjectName varchar(100)=null,

??? @ProjectArea varchar(100) =NULL,

??? @ProjectTimeS varchar(100) =NULL,

??? @ProjectTimeE varchar(100) =NULL,

??? @BusinessType varchar(100) =NULL,

??? @ProjectType varchar(100) =NULL

???

AS

--這里用一個sql判斷數(shù)據(jù)庫中臨時表是否存在,此臨時表用來--存儲遞歸查詢項目區(qū)域的信息,如果表存在則每查詢一次清空表數(shù)據(jù),如果表不存在則創(chuàng)建表結(jié)構(gòu)

if not exists(select 1 from tempdb.dbo.sysobjects where id = object_id(N'tempdb..#Area') and type='U')

begin

??? create table #Area(AreaID varchar(20),AreaName varchar(200),ParentName varchar(200))

??? if @ProjectArea is null or @ProjectArea=''

??? with AreaTable(AreaID,AreaName,ParentName) as

??? ? (

?????? select AreaID,AreaName,ParentName from ProjectArea)

?????? insert #Area select * from AreaTable

??? else

??? begin

??? with AreaTable(AreaID,AreaName,ParentName) as

??? ? (

?????? select AreaID,AreaName,ParentName from ProjectArea a where a.AreaID=@ProjectArea

?????? union all

?????? select b.AreaID,b.AreaName,b.ParentName from ProjectArea b,AreaTable c where b.ParentID=c.AreaID

??? ? )

??? ? insert #Area select * from AreaTable

??? ? end

end

else

begin

??? truncate table #Area

??? if @ProjectArea is null or @ProjectArea=''

??? begin

??? with AreaTable(AreaID,AreaName,ParentName) as

??? ? (

?????? select AreaID,AreaName,ParentName from ProjectArea)

?????? insert #Area select * from AreaTable

??? end

??? else

??? begin

??? with AreaTable(AreaID,AreaName,ParentName) as

??? ? (

?????? select AreaID,AreaName,ParentName from ProjectArea a where a.AreaID=@ProjectArea

?????? union all

?????? select b.AreaID,b.AreaName,b.ParentName from ProjectArea b,AreaTable c where b.ParentID=c.AreaID

??? ? )

??? ?insert #Area select * from AreaTable

??? ?end

end

--下面這部分是組合查詢條件的過程

?DECLARE @sqlfilter? nVARCHAR(max)

?SET @sqlfilter =''

?IF(@ProjectNo IS NOT NULL and @ProjectNo<>'')

?set @sqlfilter=@sqlfilter+' and ProjectNo='''+@ProjectNo+''''

?IF(@ProjectName IS NOT NULL and @ProjectName<>'')

?set @sqlfilter=@sqlfilter+' and ProjectName like ''%'+@ProjectName+'%'''

?IF(@BusinessType IS NOT NULL and @BusinessType<>'')

?set @sqlfilter=@sqlfilter+' and BusinessType = '''+@BusinessType+''''

?IF(@ProjectTimeS IS NOT NULL and @ProjectTimeS<>'')

?set @sqlfilter=@sqlfilter+' and ProjectTime >= '''+@ProjectTimeS+''''

?IF(@ProjectTimeE IS NOT NULL and @ProjectTimeE<>'')

?set @sqlfilter=@sqlfilter+' and ProjectTime <= '''+@ProjectTimeE+''''

?

?

?DECLARE @sqlMain nvarchar(max)--一定要聲明為nvarchar類型

?set @sqlMain=''

?set @sqlMain=@sqlMain+'select @recordCount=count(1) from? ProjectArea A ,Project B where B.ProjectArea=A.AreaID and A.AreaID in(

? select areaID from? #Area) ' +@sqlfilter

?--exec sp_executesql @sqlMain N'@recordCount int output'? @recordCount output

--為輸出參數(shù)賦值

?exec sp_executesql@sqlMain,N'@recordCount int output', @recordCount output? ?--select @recordCount

--下面就是復雜的查詢過程

?set @sqlMain=''

?set @sqlMain='select tb.* from (select A.AreaName,B.*,row_Number() over(order by B.ProjectID) as rowIndex from ProjectArea A ,Project B where B.ProjectArea=A.AreaID and A.AreaID in(

? select areaID from? #Area) '+@sqlfilter+') tb'+' where tb.rowIndex between '+cast((@PageSize*@PageIndex+1) as nvarchar)+' and '+cast(@PageSize*@PageIndex+@PageSize as nvarchar)

?exec(@sqlMain)

?????????????????

轉(zhuǎn)載于:https://www.cnblogs.com/lijinchang/p/4255854.html

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