Question

我有一些年份和月份的SP：

Create PROCEDURE Report(
    @targetYear int,
    @targetMonth int
)

用以下方式查询：

select sum(col) where year(dateTime) = @targetYear and month(dateTime) = @targetMonth

然后我一年只有同样的事情

Create PROCEDURE Report(
    @targetYear int
)

并查询它：

select sum(col) where year(dateTime) = @targetYear

当然，逻辑比sum（col）

更复杂

我的问题是，我怎么能写这个SP所以不会在两个SP上重复逻辑，即使它意味着在我指的是全年时将0传递给目标月份？

Answer 1

我喜欢乔尔的回答，但是如果你在月份中输入零，他将无法工作。你需要@ targetMonth = 0例如：

SELECT sum(col) 
WHERE year(dateTime) = @TargetYear AND 
(@targetMonth = 0 OR month(dateTime) = @targetMonth)

Answer 2

SELECT sum(col) 
FROM [yourtable]
WHERE year(dateTime) = @TargetYear 
    AND (@targetMonth < 0 OR month(dateTime) = @targetMonth)

Answer 3

存储过程可以有一个可选参数：

Create PROCEDURE Report( @targetYear int, @targetMonth int = null )

可以使用参数调用它：

exec Report 2009
exec Report 2009, 2

然后在逻辑中检查null：

SELECT sum(col) 
FROM [yourtable]
WHERE (year(dateTime) = @TargetYear and @targetMonth = null)
  OR (year(dateTime) = @TargetYear AND @targetMonth = month(dateTime))

或

SELECT sum(col) 
FROM [yourtable]
WHERE year(dateTime) = @TargetYear 
  AND (@targetMonth = null OR year(dateTime) = @TargetYear)

sql sp年或年和月

3 个答案: