Question

我知道这可能是重复的问题。参考answer in this question，它使用触发器中的游标来处理多行插入，这可能会降低性能。应该有Docs here的解决方案，但我不知道如何让它工作。多行插入后是否还有其他方法可以触发？

以下是我的触发器示例：

splitted = Str.split('.')

# splitted[0] will be 'i like cows'
# splitted[1] will be 'I also like camels'

以下是insert语句的示例：

ALTER TRIGGER [dbo].[UpdateTaskStatus] 
ON [dbo].[STG_CANCEL_TASK]   
AFTER INSERT
AS 
BEGIN

DECLARE @NO_HC VARCHAR (20) = NULL;
DECLARE @taskId VARCHAR (80) = NULL;
DECLARE @START_DATE DATETIME = NULL;

SELECT @NO_HC = RTRIM(LTRIM(INSERTED.NO_HC)) FROM INSERTED;

SELECT @START_DATE = START_DTM 
    FROM MSS.dbo.TR_TASK 
    WHERE NO_HC = @NO_HC

SET @taskId  = (SELECT TASK_ID 
                FROM MSS.dbo.TR_TASK 
                WHERE NO_HC = @NO_HC)

IF (@START_DATE IS NOT NULL)
    BEGIN
        UPDATE MCS.dbo.STG_CANCEL_TASK 
            SET RESULT = 'Error',
            TASK_ID = @taskId
            WHERE NO_HC = @NO_HC 
    END
ELSE
    BEGIN
        UPDATE MCS.dbo.STG_CANCEL_TASK 
            SET RESULT = 'Success',
            TASK_ID = @taskId
            WHERE NO_HC = @NO_HC 
    END
END;

更新：目前，我将触发器修改为类似的内容，现在可以使用了。我不确定这是否正确。

INSERT INTO STG_CANCEL_TASK (NO_HC)
VALUES ('2018032801'),
       ('2018032802'),
       ('2018032803'),
       ('2018032804'),
       ('2018032805')

Answer 1

下面的内容将有助于

UPDATE M
SET m.result = CASE
                  WHEN i.result IS NULL
                     THEN 'error' 
                     ELSE 'success' 
               END
FROM inserted i
JOIN MCS.dbo.STG_CANCEL_TASK M ON m.task_id-i.task_id
                               AND m.NO_HC = RTRIM(LTRIM(i.NO_HC))
                               AND m.START_DTM = i.START_DTM

用于处理多行插入的触发器

1 个答案: