如何在 sql 服务器中使用条件触发器进行更新

Question

我有一个 table 这样的：

---------------table1--------------------------------------------
    id    |   name  | lname   |   displayStatus   | delStatus
    1         a         b               1              0
    2         aa        bb              0              0
    3         aaa       bbb             1              0
    4         aaaa      bbbb            0              1

---------------tbl_LOG--------------------------------------------
    id    |   rowData| actType

我有这个更新触发器：

alter trigger tgr_delete
on table1
after update
as
begin
    declare @rowData nvarchar(max), @username nvarchar(50)

    if update(delStatus)
    begin
        if((select delStatus from inserted) = 1)
        begin
            set @rowData = (select CAST((CAST(id as nvarchar(12)) + ' | ' + name) as nvarchar(max)) from inserted)

            exec sp_insert_LOG 'table1', @rowData, 2
        end
        else if((select delStatus from inserted) = 0)
        begin
            set @rowData = (select CAST((CAST(id as nvarchar(12)) + ' | ' + name) as nvarchar(max)) from inserted)

            exec sp_insert_LOG 'table1', @rowData, 3
        end
    end
    else if update(displayStatus)
    begin
        if((delStatus = 0 or delStatus is null) and (select displayStatus from inserted) = 0)
        begin
            set @rowData = (select CAST((CAST(id as nvarchar(12)) + ' | ' + name) as nvarchar(max)) from inserted)

            exec sp_insert_LOG 'table1', @rowData, 4
        end
        else if((delStatus = 0 or delStatus is null) and (select displayStatus from inserted) = 1)
        begin
            set @rowData = (select CAST((CAST(id as nvarchar(12)) + ' | ' + name) as nvarchar(max)) from inserted)

            exec sp_insert_LOG 'table1', @rowData, 5
        end
    end
end

我有 3 个存储过程

首先是更新 delStatus
第二个用于更新 displayStatus
第三个用于更新所有列

现在我应该怎么做才能避免干扰前两个条件。

Answer 1

这不是一个完整的答案，因为我不知道 sp_insert_LOG 是做什么的，但它应该能让你在正确的方向上开始：

CREATE TRIGGER trg_Table1_Update ON Table1
FOR UPDATE
AS


DECLARE @LogData AS TABLE
(
    TableName sysname,
    RowData nvarchar(max),
    ActionType int
)

INSERT INTO @LogData (TableName, RowData, ActionType)
SELECT 'Table1', 
       CAST((CAST(id as nvarchar(12)) + ' | ' + name) as nvarchar(max)),
       CASE WHEN i.delStatus = 1 THEN 2
            WHEN i.delStatus = 0 THEN 3
            WHEN ISNULL(i.delStatus, 0) = 0 AND i.displayStatus = 0 THEN 4
            WHEN ISNULL(i.delStatus, 0) = 0 AND i.displayStatus = 1 THEN 5
       END
FROM INSERTED i 
INNER JOIN Deleted d ON i.Id = d.Id
WHERE (i.name = d.name OR i.name IS NULL and d.name IS NULL)
AND (i.lname = d.lname OR i.lname IS NULL and d.lname IS NULL)
AND
(
(
    ISNULL(i.delStatus, 0) <> ISNULL(d.delStatus, 0)
    AND ISNULL(i.displayStatus, 0) = ISNULL(d.displayStatus, 0)
)
OR 
(
    ISNULL(i.delStatus, 0) = ISNULL(d.delStatus, 0)
    AND ISNULL(i.displayStatus, 0) <> ISNULL(d.displayStatus, 0)
)
)

此时，@LogData table 包含您要发送到 sp_insert_LOG 的任何数据。我建议创建一个新的存储过程，如 sp_insert_log，它将接受一个 table 值参数并处理该数据。

如何在 sql 服务器中使用条件触发器进行更新

how to use conditional trigger in sql server for update

sql

sql-server

triggers

sql-server-2016