SQL Server存储过程SELECT语句与几个IF语句

Question

我已经构建了我的sql statemnet像下面的方式，但我尝试编译时出现错误。我知道我们可以在字符串中动态构建它，但是想知道我们可以像这样写语句。请寻求建议。

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

实际上，你必须建立一个varchar与查询，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

，你结合IF语句到WHERE条款

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) 

你可以做这样的事情