Question

我写了以下存储过程。如果我不使用IF ELSE块，Order by子句工作正常但我需要使用IF ELSE来构建我的select语句。订购方式不适用于IF else块。你能告诉我我做错了什么吗？在此先感谢！

ALTER PROCEDURE [dbo].[GetLookupItem] 

-- #description Gets LookupItem 
-- #tables   Subscriber.Reference.LookupItem,Subscriber.Reference.LookupText,Subscriber.Reference.LookupType
-- #parameter:   @LookupTypeId       This parameter defines a type of lookup
-- #parameter:   @LookupTextAbbreviationId            This Variable decides to tie Lookup Text to Abbreviation or Full Text. Most of the cases Full text will be used.
-- #parameter:   @LanguageCode     To show the Lookup Text in this Language

 @LookupTypeId int,
 @LookupTextAbbreviationId int ,
 @LanguageCode varchar(5)


AS

BEGIN

 SET NOCOUNT ON;
 DECLARE @MonthType int
 SET @MonthType = (SELECT Id FROM Subscriber.Reference.LookupType WHERE Name = 'Months')

 IF  @LookupTextAbbreviationId IS NULL
  BEGIN
   SELECT RLI.Id,RLT.Value
   FROM Subscriber.Reference.LookupItem RLI
   INNER JOIN Subscriber.Reference.LookupText RLT
   ON RLI.LookupTextId = RLT.Id AND RLT.LanguageCode = @LanguageCode AND RLI.LookupTextAbbreviationId IS NULL   -- LookupTextAbbreviationId will be null for full text records in Subscriber.Reference.LookupItem
   WHERE RLI.LookupTypeId = @LookupTypeId 
  END
 ELSE

  SELECT RLI.Id,RLT.Value
  FROM Subscriber.Reference.LookupItem RLI
  INNER JOIN Subscriber.Reference.LookupText RLT
  ON RLI.LookupTextAbbreviationId = RLT.Id AND RLT.LanguageCode = @LanguageCode
  WHERE RLI.LookupTypeId = @LookupTypeId


        ORDER BY                -- Order by will change for only Months by ID
        CASE  @LookupTypeId 
   WHEN @MonthType THEN RLT.Id 
   END,
  CASE 
   WHEN @LookupTypeId <> @MonthType THEN RLT.Value 
  END

 IF (@@ERROR <> 0)
  RETURN 1
 ELSE
  RETURN 0  

END

Answer 1

我认为你的order by子句语法混淆了 - 这个查询是否运行？还是会出现语法错误？

这是你在找什么？

ORDER BY  -- Order by will change for only Months by ID 
  CASE  @LookupTypeId  
    WHEN @MonthType THEN RLT.Id  
    ELSE RLT.Value  
  END

Answer 2

当@LookupTypeId等于@MonthType时，是否要按RLT.Id进行订购，否则按RLT.Value进行订购？案件应该是这样的：

ORDER BY
CASE @LookupTypeId 
   WHEN @MonthType THEN RLT.Id
   ELSE RLT.Value
END

但是，如果RLT.Id和RLT.Value不是同一类型，则会出现转换错误。如果RLT.Id为int且RLT.Value为varchar，那么您可以将大小写更改为：

ORDER BY
CASE @LookupTypeId 
   WHEN @MonthType THEN STR(RLT.Id)
   ELSE RLT.Value
END

Sql server具有参数值的Order by子句

2 个答案: