Question

用于发送dbmail的触发器，有一个变量“ DIA”在使用时将我的dbmail的@body部分转换为null，只要不使用此变量，触发器就会生成设计的电子邮件，并且在使用时会产生一封电子邮件，里面没有任何内容

我尝试从插入中声明变量，并根据插入的部分作为选择查询声明相同的结果。我以为我在某种程度上将变量转换为null到我的代码中，但是我看不到在哪里发生。我因此包括了完整的代码。当我将@DIAstr或@ DIAstr2添加到dbmail的@body部分中时，会发生问题

很抱歉，如果我缺少明显的内容，例如不是DBA或IT方面的东西，我倾向于得到这些项目，因为我们公司没有IT，我会尽我所能，但我会自学成才，我知道是我理解的空白。

基于最后的响应快速澄清，我意识到字符串中的空值将导致整个字符串为空，我很确定这是正在发生的事情，我只是不明白为什么，因为该值我一直在测试中通过不为null。

This is the result when I run the trigger as a select statement. The statement returns three result sets, one for each declaration of the DIA (UDF_4) field, and one with the variable results as null. Dose this make any sence

CREATE TRIGGER INCORRECT_PART_ENTRY_NOTIFICATION2
ON PART
AFTER INSERT
AS 

DECLARE @PART as VARCHAR(30) = (SELECT ID FROM Inserted)
DECLARE @DESCRIPTION as VARCHAR(50) = (SELECT DESCRIPTION FROM Inserted)
DECLARE @COMMODITY as VARCHAR(30) = (SELECT COMMODITY_CODE FROM Inserted)
DECLARE @PRODUCT as VARCHAR(30) = (SELECT PRODUCT_CODE FROM Inserted)
DECLARE @THICKstr as VARCHAR(30) = (SELECT USER_1 FROM Inserted)
DECLARE @THICK as decimal(7,4) = (SELECT CASE WHEN ISNUMERIC(USER_1) = 1   THEN CAST(USER_1 AS decimal(7,4)) ELSE null END FROM Inserted)
DECLARE @DIAstr as VARCHAR(30) (SELECT USER_4 FROM Inserted)
DECLARE @DIAstr2 as VARCHAR(30) (SELECT USER_4 FROM [dbo].[PART] WHERE ID = @PART)
DECLARE @DIA as decimal(7,4) = (SELECT CASE WHEN ISNUMERIC(USER_4) = 1 THEN CAST(USER_4 AS decimal(7,4)) ELSE null END FROM Inserted)
DECLARE @THICK_CHECK as VARCHAR(30)
SET @THICK_CHECK = CASE WHEN @PRODUCT IN('STOCK HEADS','DOM "MISC"','EXP "MISC"','MISC WORK','SUPPLIES','TEST','UPDATE','TOOLING') THEN 'GOOD'
               WHEN @PART LIKE '%' + REPLACE(@THICKstr, '.', '') + '%' THEN 'GOOD' 
               ELSE 'NOT GOOD' END 

DECLARE @DIA_CHECK as VARCHAR(30)
SET @DIA_CHECK = CASE WHEN @PRODUCT IN('STOCK HEADS','RAW MATERIAL','STOCK BLANK','DOM "MISC"','EXP "MISC"','MISC WORK','SUPPLIES','TEST','UPDATE','TOOLING') THEN 'GOOD'
             WHEN @PART LIKE '%' + REPLACE(@DIAstr, '.', '') + '%' THEN 'GOOD' 
             ELSE 'NOT GOOD' END


DECLARE @CODE_CALC as VARCHAR(20)
SET @CODE_CALC = CASE WHEN @PRODUCT = 'SUPPLIES' THEN 'SUPPLIES'
                  WHEN @PRODUCT = 'TEST' THEN 'TEST'
                  WHEN @PRODUCT = 'TOOLING' THEN 'TOOLING'
                  WHEN @PRODUCT = 'MISC WORK' THEN 'MISC WORK'
                  WHEN @PRODUCT = 'DOM "MISC"' THEN 'DOM "MISC"'
                  WHEN @PRODUCT = 'PLATE' THEN 'PLATE'
                  WHEN @PRODUCT = 'STOCK HEADS' THEN 'STOCK HEADS'
                  WHEN @PRODUCT = 'STOCK BLANK' THEN 'STOCK BLANK'
                  WHEN @PRODUCT = 'RAW MATERIAL' THEN 'RAW MATERIAL'

                  WHEN @PRODUCT = 'UPDATE' THEN 'UPDATE'  
                  WHEN @PRODUCT IN('DOMESTIC','FINISHED GOODS','INTERCOMPANY') THEN 'UPDATE'                                    

                  WHEN SUBSTRING(@PART,1,1) = 'V' or SUBSTRING(@PART,1,1) = 'U' THEN 'B&R DOM'      

                  WHEN CAST(@DIA AS decimal(7,4)) < 30 AND CAST(@THICK AS decimal(7,4)) < .75 THEN 'DOM "A"'
                  WHEN CAST(@DIA AS decimal(7,4)) < 30 AND CAST(@THICK AS decimal(7,4)) BETWEEN .75 AND 1.25 THEN 'DOM "B"'
                  WHEN CAST(@DIA AS decimal(7,4)) < 30 AND CAST(@THICK AS decimal(7,4)) > 1.25 THEN 'DOM "C"'

                  WHEN CAST(@DIA AS decimal(7,4)) BETWEEN 30 AND 72 AND CAST(@THICK AS decimal(7,4)) < .75 THEN 'DOM "D"'
                  WHEN CAST(@DIA AS decimal(7,4)) BETWEEN 30 AND 72 AND CAST(@THICK AS decimal(7,4)) BETWEEN .75 AND 1.25 THEN 'DOM "E"'
                  WHEN CAST(@DIA AS decimal(7,4)) BETWEEN 30 AND 72 AND CAST(@THICK AS decimal(7,4)) > 1.25 THEN 'DOM "F"'

                  WHEN CAST(@DIA AS decimal(7,4)) BETWEEN 72.001 AND 120 AND CAST(@THICK AS decimal(7,4)) < .75 THEN 'DOM "G"'
                  WHEN CAST(@DIA AS decimal(7,4)) BETWEEN 72.001 AND 120 AND CAST(@THICK AS decimal(7,4)) BETWEEN .75 AND 1.25 THEN 'DOM "H"'
                  WHEN CAST(@DIA AS decimal(7,4)) BETWEEN 72.001 AND 120 AND CAST(@THICK AS decimal(7,4)) > 1.25 THEN 'DOM "I"'

                  WHEN CAST(@DIA AS decimal(7,4)) BETWEEN 120.001 AND 144 AND CAST(@THICK AS decimal(7,4)) < .75 THEN 'DOM "J"'
                  WHEN CAST(@DIA AS decimal(7,4)) BETWEEN 120.001 AND 144 AND CAST(@THICK AS decimal(7,4)) BETWEEN .75 AND 1.25 THEN 'DOM "K"'
                  WHEN CAST(@DIA AS decimal(7,4)) BETWEEN 120.001 AND 144 AND CAST(@THICK AS decimal(7,4)) > 1.25 THEN 'DOM "L"'

                  WHEN CAST(@DIA AS decimal(7,4)) > 144 AND CAST(@THICK AS decimal(7,4)) < .75 THEN 'DOM "M"'
                  WHEN CAST(@DIA AS decimal(7,4)) > 144 AND CAST(@THICK AS decimal(7,4)) BETWEEN .75 AND 1.25 THEN 'DOM "N"'
                  WHEN CAST(@DIA AS decimal(7,4)) > 144 AND CAST(@THICK AS decimal(7,4)) > 1.25 THEN 'DOM "O"'

                  ELSE 'UPDATE' END  

DECLARE @CODE_CHECK AS CHAR(1)
SET @CODE_CHECK = CASE WHEN @CODE_CALC = 'UPDATE' THEN 'N'
                   WHEN @PRODUCT = @CODE_CALC THEN 'Y' 
                   ELSE 'N' END

BEGIN

SET NOCOUNT ON;

DECLARE @SEND as Char(1)
SET @SEND = CASE WHEN @THICK_CHECK = 'NOT GOOD' THEN 'Y'
            WHEN @DIA_CHECK = 'NOT GOOD' THEN 'Y'
            WHEN @CODE_CHECK = 'N' THEN 'Y'
            ELSE 'N' END

DECLARE @MailSubject AS varchar(50)
Set @MailSubject = 'Incorrect Part Entry - '+@PART


DECLARE @MESSAGE as Varchar(max) 
SET @MESSAGE = (SELECT 'It appears that an error may have been made entering Part ID '+ @PART+'.' +
                        CHAR(10) +
                        'This e-mail was triggered either by descripencies in the calculated product code and the enntered product code, or a match between the values entered for thickness and DIA could not be made in the Part ID.' +
                        CHAR(10) +
                        @CODE_CALC + ' ' + @PRODUCT + ' ' + @THICKstr + ' ' + @DIAstr2) 

IF @SEND = 'Y'
BEGIN
      EXEC msdb.dbo.sp_send_dbmail
      @recipients = 'xxxxx@xxx', 
      @profile_name = 'xxxxxx',
      @subject = @MailSubject, 
      @body = @MESSAGE;
END

END
GO

dbmail，为什么变量“ DIA”将@body转换为null

0 个答案: