Question

我有一个搜索我的会员表的选择程序。会员表有：

ID – Name –  Deleted
 1 – Marcus – NULL
 2 – Regina – 2014-03-26 09:33:00.000

存在：ID a PK int no NULL，命名varchar（250）并删除datetime NULL。

这是我的程序：

CREATE PROCEDURE dbo.SELECT_MEMBERS

    @ID int = NULL,
    @Name varchar(250)= NULL,
    @Deleted datetime =NULL

AS
BEGIN
 IF @Deleted = ''
        BEGIN
            SET @Deleted = NULL
        END     
        ELSE 
        BEGIN
            SET @Deleted = @Deleted
        END

 SET NOCOUNT ON;

    SELECT  ID, Name, Deleted 
    FROM dbo.Members WHERE
       (@ID IS NULL OR @ID = ID)
   AND (@Name IS NULL OR @Name = Name)
   AND (@Deleted IS NULL OR @Deleted = Deleted)


END
GO

为了搜索没有删除日期的成员（如果他们有删除日期意味着他们不是活跃成员）我会这样做：

EXEC dbo.SELECT_MEMBERS  @Deleted = ''

但这不起作用，因为我得到插入删除日期的行。

我做错了什么？

非常感谢!!

Answer 1

CREATE PROCEDURE dbo.SELECT_MEMBERS

    @ID int = NULL,
    @Name varchar(250)= NULL,
    @Deleted datetime =NULL

AS
BEGIN

 SET NOCOUNT ON;

    SELECT  ID, Name, Deleted 
    FROM dbo.Members 
    WHERE ID = ID
    AND ISNULL(@Name, '') = ISNULL(Name, '')
    AND ISNULL(@Deleted, '') = ISNULL(Deleted, '')


END
GO

Answer 2

您希望NULL日期的空/ @Deleted值的行为与NULL和@ID的{{1}}值的行为不同：您想要的@Name的实际比较仅在值为@Deleted时才为真。

我想你想要这样的东西：

NULL

SQL：搜索空日期

2 个答案: