如何在SQL Sever Select語句中編寫if條件以創建存儲過程

Question

我正在使用sql server2008（dynamic sql）編寫一個存儲過程，現在我的問題是我正在向存儲過程傳遞4個值，因為UserAgentID varchar（50）傳遞了值或為空，現在我可以傳遞基於（1233）在該顯示值上，我現在基於顯示的字段null值傳遞空的like（''），但是我正在使用表Agentid是Integer數據類型，因此我正在傳遞IS NULL如何基於該條件寫條件，我正在嘗試像這樣

ALTER Procedure [dbo].[usp_GetSearch123]      
(      
 @SearchValue varchar(100),      
 @SearchBy varchar(250),
 @DbName varchar(50),
 @UserAgentID varchar(50)     
)     
AS    
Begin

  Declare @cmd varchar(5000)

  select @cmd = 
  'Select QT.Name,SC.Name as Status,QT.QuoteNumber,QT.SubmissionNumber,QT.UnderWriter as UnderWriter,LC.Name as LineCode,QT.DBAName as DBAName         
  from Agent_Quote QT,Users US,' + @DbName + '..StatusCode SC, ' + @DbName+'..Linecode LC      
  where QT.StatusCode = SC.StatusCode And QT.LineCode = LC.LineCode and SC.StatusCode!=''C'' and US.UserID=QT.CreatedBy and US.AgentID like'''+@UserAgentID+''' and     
  (QT.Name like ''' + @SearchValue + '%'' or QT.DBAName like ''' + @SearchValue +'%'')       
  order by QT.Name,QuoteNumber desc'
print @cmd
  exec(@cmd)
 end

現在我在用戶表中傳遞空值，所以如何寫條件請幫助我任何人...謝謝

Answer 1

您可以嘗試這樣的事情

IF ISNULL(@UserAgentID, -1) = -1
  select @cmd = 
  'Select QT.Name,SC.Name as Status,QT.QuoteNumber,QT.SubmissionNumber,
  QT.UnderWriter as UnderWriter,LC.Name as LineCode,QT.DBAName as DBAName         
  from Agent_Quote QT,Users US,' + @DbName + '..StatusCode SC, ' + @DbName+'..Linecode LC      
  where QT.StatusCode = SC.StatusCode And QT.LineCode = LC.LineCode and 
  SC.StatusCode!=''C'' and US.UserID=QT.CreatedBy and 


  US.AgentID is nulll and     


  (QT.Name like ''' + @SearchValue + '%'' or QT.DBAName like ''' + @SearchValue +'%'')     


  order by QT.Name,QuoteNumber desc'
else
  select @cmd = 
  'Select QT.Name,SC.Name as Status,QT.QuoteNumber,QT.SubmissionNumber,
  QT.UnderWriter as UnderWriter,LC.Name as LineCode,QT.DBAName as DBAName         
  from Agent_Quote QT,Users US,' + @DbName + '..StatusCode SC, ' + @DbName+'..Linecode LC      
  where QT.StatusCode = SC.StatusCode And QT.LineCode = LC.LineCode and 
  SC.StatusCode!=''C'' and US.UserID=QT.CreatedBy and 


  US.AgentID like'''+@UserAgentID+''' and     


  (QT.Name like ''' + @SearchValue + '%'' or QT.DBAName like ''' + @SearchValue +'%'')       
  order by QT.Name,QuoteNumber desc'

要么

  select @cmd = 
  'Select QT.Name,SC.Name as Status,QT.QuoteNumber,QT.SubmissionNumber,
  QT.UnderWriter as UnderWriter,LC.Name as LineCode,QT.DBAName as DBAName         
  from Agent_Quote QT,Users US,' + @DbName + '..StatusCode SC, ' + @DbName+'..Linecode LC      
  where QT.StatusCode = SC.StatusCode And QT.LineCode = LC.LineCode and 
  SC.StatusCode!=''C'' and US.UserID=QT.CreatedBy and 


  ((@UserAgentID is null AND US.AgentID is null) OR US.AgentID like'''+@UserAgentID+''') and     


  (QT.Name like ''' + @SearchValue + '%'' or QT.DBAName like ''' + @SearchValue +'%'')       
  order by QT.Name,QuoteNumber desc'

Answer 2

這個問題有點令人困惑，但是如果它以AgentID問題為中心，我將做出以下假設：

1）您表中的AgentID的數據類型為int

2）您在AgentID欄中也有NULL值

因此，當您將該變量作為字符串傳遞時（不應該這樣做，保持數據類型一致並傳遞0或其他無效的ID值），您可以嘗試執行如下的AgentID條件：

--First, create int prameter and validate the @UserAgentID parameter
DECLARE @AgentID int
SELECT @AgentID = 0
IF ISNUMERIC(@UserAgentID)=1
BEGIN
SELECT @AgentID = CAST(@UserAgentID AS int)
END

--update your @UserAgentID condition statement as follows
    ... and ISNULL(US.AgentID,0) = '+CAST(@AgentID AS nvachar(10))+' and 

...

如果您的agentid是varchar類型的列，則應該可以執行以下操作...

... and ISNULL(US.AgentID,'') like ''' + ISULL(@UserAgentID,'') + ''' and

再次，條件語句和數據類型使我陷入困境（ID列是否需要“ LIKE”？），但希望這會引導您朝正確的方向發展。

高溫超導

戴夫