搜索操作的存储过程

Question

我在 SQL Server 2005 中有一个存储过程，用于根据从 UI 传递的参数检索值。

这基本上是对许多表的JOIN 名称的搜索操作。我的问题是，当用户不提供中间名时，我的程序无法访问该值。

    P.FirstName = Coalesce( @FirstName,P.FirstName) AND 
    P.MiddleName = Coalesce(@MiddleName,P.MiddleName)  AND 
    P.LastName = Coalesce( @LastName,P.LastName) AND
    (
         P.FirstName = Coalesce(@anyName,P.FirstName)  OR
   P.MiddleName = Coalesce(@anyName,P.MiddleName)  OR
   P.LastName = Coalesce(@anyName,P.LastName) 
     )

我无法删除中间名，因为我在上述所有列上都提供了过滤选项。

Answer 1

where (MiddleName = Coalesce(@MiddleName ,MiddleName ) or MiddleName is null)

不要忘记在您引用 MiddleName 的两个位置都这样做

Answer 2

改成这样：

(P.MiddleName = @MiddleName or P.MiddleName is null or @MiddleName is null)

这是完整的例子：

(P.FirstName = @FirstName or P.FirstName is null or @FirstName is null) AND
(P.MiddleName = @MiddleName or P.MiddleName is null or @MiddleName is null) AND      
(P.LastName = @LastName or P.LastName is null or @LastName is null) AND     
(  @AnyName is null or
   P.FirstName =  @AnyName or
   P.MiddleName = @AnyName or       
   P.LastName   = @AnyName ) 

Answer 3

试试这样的

CASE WHEN @FirstName IS NULL THEN CASE WHEN P.FirstName is NULL THEN 1 ELSE 0 END
    ELSE CASE WHEN P.FirstName = Coalesce( @FirstName,P.FirstName) THEN 1 ELSE 0 END
        END = 1