Question

我已经构建了我的sql statemnet，如下所示，但是在尝试编译时遇到错误。我知道我们可以在字符串中动态构建它但是我们知道可以像这样编写语句。请寻找建议。

INSERT INTO #tmpHierarchy (  
 JID ,  
 EntryDate ,  
 RefundDate ,  
 ActionBy ,  
 Comments ,  
 CID,  
 nLevel  
)    
SELECT 
   JID, EntryDate, RefundDate, ActionBy, Comments, CID, nLevel 
FROM 
   Hierarchy  
WHERE 1=1 
   AND 
IF @FromDate <> '' AND @ToDate <> ''
BEGIN
    Convert(varchar,EntryDate,112)>= @FromDate AND Convert(varchar,EntryDate,112) <= @ToDate
END

IF @ActionBy <> ''
BEGIN
    ActionBy=@ActionBy
END

IF @JID > 0
BEGIN
    JID=@JID
END

Answer 1

您实际上必须使用查询构建varchar，然后执行它：

declare @sql varchar(max)

set @sql = 'INSERT INTO #tmpHierarchy (  
 JID ,  
 EntryDate ,  
 RefundDate ,  
 ActionBy ,  
 Comments ,  
 CID,  
 nLevel  
)    
SELECT JID,EntryDate,RefundDate,ActionBy,Comments,CID,nLevel FROM Hierarchy  WHERE 1=1' 

IF @FromDate <> '' AND @ToDate <> ''
BEGIN
    @sql = @sql + ' and Convert(varchar,EntryDate,112)>= @FromDate AND Convert(varchar,EntryDate,112) <= @ToDate'
END

IF @ActionBy <> ''
BEGIN
    @sql = @sql + ' and ActionBy=@ActionBy'
END

IF @JID > 0
BEGIN
    @sql = @sql + ' and JID=@JID'
END

exec (@sql)

Answer 2

您可以执行以下操作，将IF语句合并到WHERE子句中

SELECT JID, EntryDate, RefundDate, ActionBy, Comments, CID, nLevel 
FROM Hierarchy  
WHERE 1 = 1 
AND (@FromDate = '' OR @ToDate = '' OR (Convert(varchar, EntryDate, 112) >= @FromDate AND Convert(varchar, EntryDate, 112) <= @ToDate))
AND (@ActionBy = '' OR ActionBy = @ActionBy)
AND (@JID <= 0 OR JID = @JID)

SQL Server存储过程SELECT语句带有很少的IF语句

2 个答案: