在T-SQL中的case语句中

Is possible using break command in case statement in mssql?

可以在mssql的case语句中使用break命令吗？

Because the condition is verified that expression GO, instead of doing the next CASE's transition. ssip_miktar is 5, ssip_teslim_miktar is 0 and S74MIKTAR is 5

因为条件验证表达式GO，而不是做下一个CASE的转换。 ssip_miktar是5，ssip_teslim_miktar是0，S74MIKTAR是5

update set ssip_teslim_miktar= ssip_teslim_miktar+
CASE WHEN ssip_miktar<@S74MIKTAR AND ssip_teslim_miktar=0 THEN @S74MIKTAR-ssip_miktar
WHEN ssip_miktar<@S74MIKTAR AND ssip_teslim_miktar>0 THEN @S74MIKTAR-(ssip_miktar+ssip_teslim_miktar) 
WHEN ssip_miktar=@S74MIKTAR AND ssip_teslim_miktar=0 THEN @S74MIKTAR 
WHEN ssip_miktar=@S74MIKTAR AND ssip_teslim_miktar>0 THEN @S74MIKTAR-ssip_teslim_miktar
 WHEN ssip_miktar>@S74MIKTAR AND ssip_teslim_miktar=0 THEN @S74MIKTAR
 WHEN ssip_miktar>@S74MIKTAR AND ssip_teslim_miktar>0 THEN @S74MIKTAR  
END,
@S74MIKTAR=@S74MIKTAR-CASE 
         WHEN  ssip_miktar<@S74MIKTAR AND ssip_teslim_miktar=0 THEN @S74MIKTAR-ssip_miktar
         WHEN  ssip_miktar<@S74MIKTAR AND ssip_teslim_miktar>0 THEN @S74MIKTAR-(ssip_miktar+ssip_teslim_miktar)
         WHEN  ssip_miktar=@S74MIKTAR AND ssip_teslim_miktar=0 THEN @S74MIKTAR
         WHEN  ssip_miktar=@S74MIKTAR AND ssip_teslim_miktar>0 THEN @S74MIKTAR-ssip_teslim_miktar
         WHEN  ssip_miktar>@S74MIKTAR AND ssip_teslim_miktar=0 THEN @S74MIKTAR
         WHEN  ssip_miktar>@S74MIKTAR AND ssip_teslim_miktar>0 THEN @S74MIKTAR
                     ELSE 0
      END
where ssip_teslim_miktar<ssip_miktar

3 个解决方案

#1

You shouldn't need to use a break because SQL Case statements don't fall through.

您不应该使用中断，因为SQL Case语句不会失败。

DECLARE @x int

SET @x = 0

SELECT CASE
    WHEN @x = 0 THEN 'zero'     -- Only this line of the expression is evaluated
    WHEN @x <> 0 THEN 'not-zero'
    END

#2

This is transactional SQL and is not iterative. It does not require a break because only one of the when/else clauses will be evaulated.

这是事务性SQL，不是迭代的。它不需要中断，因为只会调用其中一个when / else子句。

Try the following:

请尝试以下方法：

declare @test int
set @test=1
select @test = @test + 
    case 
        when 1=1 then 1
        when 2=2 then 1
        when 3=3 then 1
        when 4=4 then 1
        when 5=5 then 1
        when 6=6 then 1
        when 7=7 then 1
        when 8=8 then 1
        else 1
       end
select @test

@test is only ever 2

@test只有2

#3

This is not necessary. THEN effectively acts as a return or break, so the statement is short-circuited.

这不是必要的。然后这有效地作为回报或休息，因此该陈述被短路。

#1