如何在动态sql中的where子句中使用变量

嗨如何在MSSQL中的where子句中使用变量？ @UI变量并不是静态的，我在sql中出现这样的错误。它在我想运行更新或插入语句时与列名一起工作。如何在动态sql中的where子句中使用变量

declare @UI varchar(50) 
set @UI = 'IDNumber' 

exec 'set @ClientExist = isnull((select top 1 clientid from Clients 
           where '+ @UI +' = ''6001016119085'' 
            or '+ @UI +' = ''None'' 
            and cancelled <> 1 
           order by ClientID desc),0)' 

      declare @sql nvarchar(max) 
set @sql = N'declare @StagingID int 
    declare @ClientID int 
    declare @VehicleID int 
    declare @tempID1 int 
    declare @tempID2 int 
    declare @ClientExist int 

    set @tempID1 = 0 
    set @tempID2 = 0 
    set @ClientID = 0 
    set @VehicleID = 0 

    declare @rows integer 
    declare @column1 nvarchar(500) 
    declare @column2 nvarchar(500) 
    declare @column3 nvarchar(500) 
    declare @column4 nvarchar(500) 
    declare @column5 nvarchar(500) 
    declare @column6 nvarchar(500) 
    declare @column7 nvarchar(500) 
    declare @column8 nvarchar(500) 
    declare @column9 nvarchar(500) 
    declare @column10 nvarchar(500) 
    declare @column11 nvarchar(500) 
    declare @column12 nvarchar(500) 
    declare @column13 nvarchar(500) 
    declare @column14 nvarchar(500) 
    declare @column15 nvarchar(500) 
    declare @column16 nvarchar(500) 
    declare @column17 nvarchar(500) 
    declare @column18 nvarchar(500) 
    declare @column19 nvarchar(500) 
    declare @column20 nvarchar(500) 
    declare @column21 nvarchar(500) 
    declare @column22 nvarchar(500) 
    declare @column23 nvarchar(500) 
    declare @column24 nvarchar(500) 
    declare @column25 nvarchar(500) 
    declare @column26 nvarchar(500) 
    declare @column27 nvarchar(500) 
    declare @column28 nvarchar(500) 
    declare @column29 nvarchar(500) 
    declare @column30 nvarchar(500) 
    declare @column31 nvarchar(500) 
    declare @column32 nvarchar(500) 
    declare @column33 nvarchar(500) 
    declare @column34 nvarchar(500) 
    declare @column35 nvarchar(500) 
    declare @column36 nvarchar(500) 
    declare @column37 nvarchar(500) 
    declare @column38 nvarchar(500) 
    declare @column39 nvarchar(500) 
    declare @column40 nvarchar(500) 
    declare @column41 nvarchar(500) 
    declare @column42 nvarchar(500) 
    declare @column43 nvarchar(500) 
    declare @column44 nvarchar(500) 
    declare @column45 nvarchar(500) 
    declare @column46 nvarchar(500) 
    declare @column47 nvarchar(500) 
    declare @column48 nvarchar(500) 
    declare @column49 nvarchar(500) 
    declare @column50 nvarchar(500) 

    Select * 
    into #temp 
    from Staging 
    where brokerID = '+ @BrokerID +' and ImportStatus <> ''Processed'' 

    set @rows = (select COUNT(1) from #temp)  

    WHILE @rows > 0 
     BEGIN 
      set @tempID2 = @tempID1 

      select @StagingID = StagingID 
      ,@column1 = column1 
      ,@column2 = column2 
      ,@column3 = column3 
      ,@column4 = column4 
      ,@column5 = column5 
      ,@column6 = column6 
      ,@column7 = column7 
      ,@column8 = column8 
      ,@column9 = column9 
      ,@column10 = column10 
      ,@column11 = column11 
      ,@column12 = column12 
      ,@column13 = column13 
      ,@column14 = column14 
      ,@column15 = column15 
      ,@column16 = column16 
      ,@column17 = column17 
      ,@column18 = column18 
      ,@column19 = column19 
      ,@column20 = column20 
      ,@column21 = column21 
      ,@column22 = column22 
      ,@column23 = column23 
      ,@column24 = column24 
      ,@column25 = column25 
      ,@column26 = column26 
      ,@column27 = column27 
      ,@column28 = column28 
      ,@column29 = column29 
      ,@column30 = column30 
      ,@column31 = column31 
      ,@column32 = column32 
      ,@column33 = column33 
      ,@column34 = column34 
      ,@column35 = column35 
      ,@column36 = column36 
      ,@column37 = column37 
      ,@column38 = column38 
      ,@column39 = column39 
      ,@column40 = column40 
      ,@column41 = column41 
      ,@column42 = column42 
      ,@column43 = column43 
      ,@column44 = column44 
      ,@column45 = column45 
      ,@column46 = column46 
      ,@column47 = column47 
      ,@column48 = column48 
      ,@column49 = column49 
      ,@column50 = column50 
      from #temp 

      --Check for duplicate client, insert or update then 
      declare @UIvalue varchar(50) 

      set @UIvalue = (select StageColumn from ColumnStructure where [uniqueidentifier] = 1) 

      set @ClientExist = isnull((select top 1 clientid from Clients where '+ @UI +' = @UIvalue or '+ @UI +' = ''None'' and cancelled <> 1 order by ClientID desc),0) 
      if @ClientExist = 0 
      Begin 
       if len(''' + @ClientCCol + ''') > 0 and len(''' + @ClientSCol + ''') > 0 
       Begin 
        Insert into Clients (' + @ClientCCol + ', System, DateAdded) Values (@' + @ClientSCol + ', ''Import'', getdate()) 
        set @ClientID = (select @@Identity) 
       End 
      End 
      ELSE 
      Begin 
       Update Clients set ' + @UpdateC + ' where clientid = @ClientExist 
      End 

      set @tempID1 = (select @@identity) 

      if @ClientID > 0 
      Begin 
      Update Clients set Province = (select p.ProvinceID from Provinces p inner join clients c on c.ProvinceDesc = p.Province where clientid = @ClientID and p.Province = c.ProvinceDesc) 
       ,Country = (select co.CountryID from Countrys co inner join clients c on c.CountryDesc = co.Country where clientid = @ClientID and co.Country = c.CountryDesc) 
       ,Title = (select t.TitleID from Titles t inner join clients c on c.TitleDesc = t.Title where clientid = @ClientID and t.Title = c.TitleDesc) 
      where ClientID = @ClientID 
      End 

      declare @Registration varchar(100) 
      declare @EngineNum varchar(100) 
      set @Registration = (select StageColumn from ColumnStructure where ClientsCol = ''Registration'' and BrokerID = ' + @BrokerID + ') 
      set @EngineNum = (select StageColumn from ColumnStructure where ClientsCol = ''EngineNum'' and BrokerID = ' + @BrokerID + ') 

      --Check for duplicate vehicle, insert or update then 
      set @VehicleID = isnull((select top 1 isnull(VehicleID, 0) from VehicleInformation where clientid = @ClientID and Registration = @Registration and EngineNum = @EngineNum order by VehicleID desc),0) 

      if @VehicleID = 0 
      Begin 
       if len(''' + @VehicleCCol + ''') > 0 and len(''' + @VehicleSCol + ''') > 0 
       Begin 
        Insert into VehicleInformation (' + @VehicleCCol + ', ClientID) Values (@' + @VehicleSCol + ', @ClientID) 
        set @VehicleID = (select @@Identity) 
       End 
      End 
      Else 
      Begin 
       Update VehicleInformation set ' + @UpdateV + ' where VehicleID = @VehicleID 
      End 

      if @VehicleID > 0 
      Begin 
       Update VehicleInformation set Make = (select vm.MakeID from VehicleMake vm inner join VehicleInformation v on v.Makedesc = vm.Make where v.VehicleID = @VehicleID and vm.make = v.makedesc) where VehicleID = @VehicleID 
      End 


      if (@tempID1 <> 0 or @tempID1 is not null) and @tempID1 > @tempID2 
       update dbo.Staging 
       set DateAdded = getdate(), ImportStatus = ''Processed'' 
       where StagingID = @StagingID 
      Else 
       update dbo.Staging 
       set DateAdded = getdate(), ImportStatus = ''Error Occured'' 
       where StagingID = @StagingID 

      delete from #temp where StagingID = @StagingID 
      set @rows = (select COUNT(1) from #temp) 

      set @VehicleID = 0 
      set @ClientID = 0 
    END 

      drop table #temp' 


     exec (@sql)

这是实际的查询进出口运行ALLT在“+”聊天室从outside..now该做的工作调用变数，但是当我把@UI在它开始gaving我的错误......与chr（39）在它不会编译，因此将在服务器2008年@戈登回答帮助满足，我必须声明所有变量里面像@戈登做他的例子与@Clientid

来源

2014-05-23 T.S.G

使用sp_executesql 。这样，您可以将变量传入和传出语句。在你的情况下，语法是这样的：

declare @UI varchar(50); 
declare @ClientId varchar(50); 
set @UI = 'IDNumber'; 
declare @sql nvarchar(max); 

SET @sql = N' select top 1 @ClientId = clientid 
      from Clients 
      where '+ QUOTENAME(@UI) + N' = ''6001016119085'' or ' 
      + QUOTENAME(@UI) + N' = ''None'' and cancelled <> 1'; 

exec sp_executesql @sql 
       , N'@ClientId varchar(50) OUTPUT' 
       , @ClientId = @ClientId OUTPUT 

set @ClientExist = coalesce(@ClientId, 0);

的文档sp_executesql是here。

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2014-05-23 13:26:19

打败我的实际例子。将转储我的答案。 –

@StevePettifer这应该工作，我很抱歉先生编辑你的答案很多次:) –

不是我的答案乡绅！最主要的是它最终成为一个正确的，可运行的答案。我们如何到达那里并不重要。 –

的情况下，它的SQLSERVER 2000，其中sp_executesql不起作用创建临时表和存储数据有

declare @UI varchar(50) 
set @UI = 'IDNumber' 
create table #result (ClientExist bit) -- temp table to store the data 
declare @SQL varchar(4000) 
set @SQL = 
    'insert into #result (ClientExist) 
    select isnull((select top 1 clientid 
    from Clients where '+ @UI +' = ''6001016119085'' or '+ @UI +' = ''None'' and cancelled <> 1 order by ClientID desc),0)' 

execute(@SQL) 

declare @ClientExist bit 
SET @ClientExist = (select top 1 ClientExist from #result)

我复制了这个问题：“因为是” select，我通常会逃避单引号与CHR（ 39）所以它会是：...where '+ @UI +' = '+chr(39)+'6001016119085'+chr(39)+' or '...

来源

2014-05-23 13:30:10 georstef

我不相信嵌入式SQL的范围是'＃result'，但我没有SQL Server 2000来测试它。 –

我使用服务器2008 R2，并感谢它的工作，但现在得到新的错误'转换nvarchar值时转换失败'是错误，然后整个动态字符串包含在其中 –

@TSG：尝试用chr转义单引号（39）但Gordon Linoff的回答应该涵盖你的sqlserver2008 – georstef

如何在动态sql中的where子句中使用变量

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