Question

如果用户未输入值，则需要编写一个程序来检索数据，其中某些选择标准未被纳入程序。我正在过滤：

WHERE @ts = [ts] or @username = [username] 
or @ip = [ip] or @my_category = [my_category]
or @my_name = [my_name] or @nm1_name = [nm1_name]
or @param = [param] or @short_descr = [short_descr]

当我调用存储过程并传递过滤的工作参数之一时，以及当我写一些时，只有一个过滤工作（因为我的逻辑'或'）。替换为'和'不必要地不必要地传递所有参数，我只需要传输那些我想要过滤掉的参数。请帮我解决这个问题

Answer 1

WHERE (@ts IS NULL OR [ts] = @ts)
and (@username IS NULL OR [username] = @username)
and (@ip IS NULL OR [ip] = @ip)
and (@my_category IS NULL OR [my_category] = @my_category)
and (@my_name IS NULL OR [my_name] = @my_name)
and (@nm1_name IS NULL OR [nm1_name] = @nm1_name)
and (@param IS NULL OR [param] = @param)
and (@short_descr IS NULL OR [short_descr] = @short_descr)

修改

我在评论中看到你正在传递空字符串而不是NULL。在这种情况下，您需要替代（或另外）处理NULLs

WHERE (@ts IS NULL OR @ts = '' OR [ts] = @ts) and (@username IS NULL OR @username = '' OR [username] = @username) and (@ip IS NULL OR @ip = '' OR [ip] = @ip) and (@my_category IS NULL OR @my_category = '' OR [my_category] = @my_category) and (@my_name IS NULL OR @my_name = '' OR [my_name] = @my_name) and (@nm1_name IS NULL OR @nm1_name = '' OR [nm1_name] = @nm1_name) and (@param IS NULL OR @param = '' OR [param] = @param) and (@short_descr IS NULL OR @short_descr = '' OR [short_descr] = @short_descr)

Answer 2

当您不使用相关过滤器时，您将参数设置为NULL，对吗？

所以你可以使用这样的查询：

WHERE isnull(@ts, [ts]) = [ts]
and isnull(@username, [username]) = [username] 
and isnull(@ip, [ip]) = [ip]
and isnull(@my_category, [my_category]) = [my_category]
and isnull(@my_name, [my_name]) = [my_name]
and isnull(@nm1_name, [nm1_name]) = [nm1_name]
and isnull(@param, [param]) = [param]
and isnull(@short_descr, [short_descr]) = [short_descr]
option (recompile)

我主张在这种情况下使用选项（重新编译）

修改

使用''而不是NULL

WHERE @ts in ('', [ts])
and @username in ('', [username])
and @ip in ('', [ip])
and @my_category in ('', [my_category])
and @my_name in ('', [my_name])
and @nm1_name in ('', [nm1_name])
and @param in ('', [param])
and @short_descr in ('', [short_descr])

（比每次使用OR更具可读性，并且不需要重新编译*）

（*）因为参数不会被嗅探

存储过程过滤

2 个答案: