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
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）