SQL Case Statement麻烦

时间：2012-03-23 08:26:51

标签： sql sql-server-2008 switch-statement

我还不是最好的SQL仍在学习绳索。 我的SQL服务器管理器2008中有一个存储过程。

USE [ShaftData]
GO
/****** Object:  StoredProcedure [dbo].[GetSalesBuyers]    Script Date: 03/23/2012  08:13:17 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[GetSalesBuyers] 
@Cdisc varchar(255),
@bcs varchar(255), 
@From date, 
@Too date
AS
SELECT i.Acct,
   i.Name, 
   i.Document, 
   i.Part, 
   i.Qty, 
   i.Unit, 
   dbo.NEWPareto.Pareto, 
   i.pg,
   dbo.MyPgTable.PgName,
   i.[DateTime],
   i.BinSeqNo,
   i.cdisc,
   i.bcs

FROM   
OPENQUERY(SACBAUTO, 'SELECT dbo.iHeads.acct,
                            dbo.iHeads.name,
                            dbo.iLines.Document,
                            dbo.iLines.Part,
                            dbo.iLines.Pg,
                            dbo.iLines.Qty,
                            dbo.iLines.unit,
                            dbo.iHeads.[DateTime], 
                            dbo.iLines.BinSeqNo, 
                            dbo.Customer.cdisc,
                            dbo.Customer.Bcs
                     FROM Autopart.dbo.iheads INNER JOIN   Autopart.dbo.iLines ON 
                     Autopart.dbo.Iheads.document = autopart.dbo.iLines.document
                     INNER JOIN Autopart.dbo.Customer ON Autopart.dbo.iheads.acct 
                     = Autopart.dbo.customer.keycode
                     GROUP By dbo.iHeads.acct,
                            dbo.iHeads.name,
                            dbo.iLines.Document,
                            dbo.iLines.Part,
                            dbo.iLines.Pg,
                            dbo.iLines.Qty,
                            dbo.iLines.unit,
                            dbo.iHeads.[DateTime],
                            dbo.iLines.BinSeqNo,
                            dbo.Customer.cdisc,
                            dbo.Customer.bcs
                      ') i
left JOIN
dbo.NEWPareto
ON 
i.Part collate SQL_Latin1_General_CP1_CI_AS = dbo.NEWPareto.Part 
left JOIN
dbo.MyPgTable 
ON  
 i.pg collate SQL_Latin1_General_CP1_CI_AS = dbo.MyPgTable.[pGroup]

WHERE
 (i.[DateTime] BETWEEN @From AND @Too) 
 AND i.cdisc = @Cdisc 
 AND i.bcs != @bcs
 AND i.pg != '60'
 AND i.pg != '61'
 AND i.pg != '62'

 GROUP BY i.Acct,
   i.Name, 
   i.Document, 
   i.Part, 
   i.Qty, 
   i.Unit, 
   dbo.NEWPareto.Pareto, 
   i.pg,
   dbo.MyPgTable.PgName, 
   i.[DateTime],
   i.BinSeqNo,
   i.cdisc,
   i.bcs

我需要的是Where子句中的条件。特别是这行“AND i.bcs！= @bcs”。

如果我将一个空字符串传递给我的参数，我希望此行存在并在where子句中运行。

否则，如果我没有传递任何内容（null），我需要该行不存在（不运行）。

我已经玩过了，但是当我试图创作时，我到处都是红线。

有没有人有想法？我接近我的方法吗？能做到吗？或者是否有一种简单的模式方式即时通过。 非常感谢

2 个答案:

答案 0 :(得分：2)

可选参数的构造如下：

WHERE (@bcs is null OR i.bcs != @bcs)

如果发送null，则选择每一行;如果您发送任何其他内容，则只选择不匹配的行。你不应该担心性能，因为Sql Server对常量表达式非常好，如果它的计算结果为1，它将被抑制。

USE [ShaftData]
GO
/****** Object:  StoredProcedure [dbo].[GetSalesBuyers]    Script Date: 03/23/2012  08:13:17 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[GetSalesBuyers] 
@Cdisc varchar(255),
@bcs varchar(255), 
@From date, 
@Too date
AS
SELECT i.Acct,
   i.Name, 
   i.Document, 
   i.Part, 
   i.Qty, 
   i.Unit, 
   dbo.NEWPareto.Pareto, 
   i.pg,
   dbo.MyPgTable.PgName,
   i.[DateTime],
   i.BinSeqNo,
   i.cdisc,
   i.bcs

FROM   
OPENQUERY(SACBAUTO, 'SELECT dbo.iHeads.acct,
                            dbo.iHeads.name,
                            dbo.iLines.Document,
                            dbo.iLines.Part,
                            dbo.iLines.Pg,
                            dbo.iLines.Qty,
                            dbo.iLines.unit,
                            dbo.iHeads.[DateTime], 
                            dbo.iLines.BinSeqNo, 
                            dbo.Customer.cdisc,
                            dbo.Customer.Bcs
                     FROM Autopart.dbo.iheads INNER JOIN   Autopart.dbo.iLines ON 
                     Autopart.dbo.Iheads.document = autopart.dbo.iLines.document
                     INNER JOIN Autopart.dbo.Customer ON Autopart.dbo.iheads.acct 
                     = Autopart.dbo.customer.keycode
                     GROUP By dbo.iHeads.acct,
                            dbo.iHeads.name,
                            dbo.iLines.Document,
                            dbo.iLines.Part,
                            dbo.iLines.Pg,
                            dbo.iLines.Qty,
                            dbo.iLines.unit,
                            dbo.iHeads.[DateTime],
                            dbo.iLines.BinSeqNo,
                            dbo.Customer.cdisc,
                            dbo.Customer.bcs
                      ') i
left JOIN
dbo.NEWPareto
ON 
i.Part collate SQL_Latin1_General_CP1_CI_AS = dbo.NEWPareto.Part 
left JOIN
dbo.MyPgTable 
ON  
 i.pg collate SQL_Latin1_General_CP1_CI_AS = dbo.MyPgTable.[pGroup]

WHERE
 (i.[DateTime] BETWEEN @From AND @Too) 
 AND i.cdisc = @Cdisc 
 AND (@bcs is null OR i.bcs != @bcs)
 AND i.pg != '60'
 AND i.pg != '61'
 AND i.pg != '62'

 GROUP BY i.Acct,
   i.Name, 
   i.Document, 
   i.Part, 
   i.Qty, 
   i.Unit, 
   dbo.NEWPareto.Pareto, 
   i.pg,
   dbo.MyPgTable.PgName, 
   i.[DateTime],
   i.BinSeqNo,
   i.cdisc,
   i.bcs

答案 1 :(得分：1)

我知道你能做到的唯一方法（你想要的就是使用动态sql），这就是说，它并不漂亮。你把整个proc放在一个字符串变量中然后根据需要构建它。然后在最后执行它。我稍后会用一个样本更新这篇文章。

请查看此link，了解语法的正常结构。

不要判断我，我通常不会这样编码

但这是你正在寻找的部分

 IF (ISNULL(@bcs,0) <> 0)
       SET @SQL = @SQL + ' AND i.bcs != '+@bcs + CHAR(13)

您的更新过程。

USE [ShaftData]
GO
/****** Object:  StoredProcedure [dbo].[GetSalesBuyers]    Script Date: 03/23/2012  08:13:17 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[GetSalesBuyers] 
@Cdisc varchar(255),
@bcs varchar(255), 
@From date, 
@Too date
AS

DECLARE @SQL NVARCHAR(MAX)

SET @SQL = ' SELECT i.Acct, i.Name, i.Document, i.Part, i.Qty, i.Unit, dbo.NEWPareto.Pareto, i.pg,' + CHAR(13)
SET @SQL = @SQL + '   dbo.MyPgTable.PgName,i.[DateTime],i.BinSeqNo,i.cdisc,i.bcs' + CHAR(13)
SET @SQL = @SQL + ' FROM   ' + CHAR(13)
SET @SQL = @SQL + ' OPENQUERY(SACBAUTO, ''SELECT dbo.iHeads.acct, dbo.iHeads.name,dbo.iLines.Document,dbo.iLines.Part, ' + CHAR(13)
SET @SQL = @SQL + '                            dbo.iLines.Pg,dbo.iLines.Qty,dbo.iLines.unit,dbo.iHeads.[DateTime], dbo.iLines.BinSeqNo, ' + CHAR(13)
SET @SQL = @SQL + '                            dbo.Customer.cdisc,dbo.Customer.Bcs ' + CHAR(13)
SET @SQL = @SQL + '                     FROM Autopart.dbo.iheads INNER JOIN   Autopart.dbo.iLines ON ' + CHAR(13)
SET @SQL = @SQL + '                     Autopart.dbo.Iheads.document = autopart.dbo.iLines.document' + CHAR(13)
SET @SQL = @SQL + '                     INNER JOIN Autopart.dbo.Customer ON Autopart.dbo.iheads.acct ' + CHAR(13)
SET @SQL = @SQL + '                     = Autopart.dbo.customer.keycode' + CHAR(13)
SET @SQL = @SQL + '                     GROUP By dbo.iHeads.acct,' + CHAR(13)
SET @SQL = @SQL + '                            dbo.iHeads.name,' + CHAR(13)
SET @SQL = @SQL + '                            dbo.iLines.Document,' + CHAR(13)
SET @SQL = @SQL + '                            dbo.iLines.Part,' + CHAR(13)
SET @SQL = @SQL + '                            dbo.iLines.Pg,' + CHAR(13)
SET @SQL = @SQL + '                            dbo.iLines.Qty,' + CHAR(13)
SET @SQL = @SQL + '                            dbo.iLines.unit,' + CHAR(13)
SET @SQL = @SQL + '                            dbo.iHeads.[DateTime],' + CHAR(13)
SET @SQL = @SQL + '                            dbo.iLines.BinSeqNo,' + CHAR(13)
SET @SQL = @SQL + '                            dbo.Customer.cdisc,' + CHAR(13)
SET @SQL = @SQL + '                            dbo.Customer.bcs' + CHAR(13)
SET @SQL = @SQL + '                      '') i' + CHAR(13)
SET @SQL = @SQL + 'left JOIN' + CHAR(13)
SET @SQL = @SQL + 'dbo.NEWPareto' + CHAR(13)
SET @SQL = @SQL + 'ON ' + CHAR(13)
SET @SQL = @SQL + 'i.Part collate SQL_Latin1_General_CP1_CI_AS = dbo.NEWPareto.Part ' + CHAR(13)
SET @SQL = @SQL + 'left JOIN' + CHAR(13)
SET @SQL = @SQL + 'dbo.MyPgTable ' + CHAR(13)
SET @SQL = @SQL + 'ON  ' + CHAR(13)
SET @SQL = @SQL + ' i.pg collate SQL_Latin1_General_CP1_CI_AS = dbo.MyPgTable.[pGroup]' + CHAR(13)
SET @SQL = @SQL + 'WHERE' + CHAR(13)
SET @SQL = @SQL + ' (i.[DateTime] BETWEEN ''+@From+'' AND ''+@Too+'') ' + CHAR(13)
SET @SQL = @SQL + ' AND i.cdisc = '+ @Cdisc  + CHAR(13)


IF (ISNULL(@bcs,0) <> 0)
   SET @SQL = @SQL + ' AND i.bcs != '+@bcs + CHAR(13)


SET @SQL = @SQL + ' AND i.pg != ''60''' + CHAR(13)
SET @SQL = @SQL + ' AND i.pg != ''61''' + CHAR(13)
SET @SQL = @SQL + ' AND i.pg != ''62''' + CHAR(13)

SET @SQL = @SQL + ' GROUP BY i.Acct,' + CHAR(13)
SET @SQL = @SQL + '   i.Name, ' + CHAR(13)
SET @SQL = @SQL + '   i.Document, ' + CHAR(13)
SET @SQL = @SQL + '   i.Part, ' + CHAR(13)
SET @SQL = @SQL + '   i.Qty, ' + CHAR(13)
SET @SQL = @SQL + '   i.Unit, ' + CHAR(13)
SET @SQL = @SQL + '   dbo.NEWPareto.Pareto, ' + CHAR(13)
SET @SQL = @SQL + '   i.pg,' + CHAR(13)
SET @SQL = @SQL + '   dbo.MyPgTable.PgName, ' + CHAR(13)
SET @SQL = @SQL + '   i.[DateTime],' + CHAR(13)
SET @SQL = @SQL + '   i.BinSeqNo,' + CHAR(13)
SET @SQL = @SQL + '   i.cdisc,' + CHAR(13)
SET @SQL = @SQL + '   i.bcs' + CHAR(13)

EXEC（@SQL）

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