Question

无论如何使用SQL触发器更新变量表？

我有一个名为读数的表，它使用多个不同的点编号进行更新，我希望在此表上有一个触发器，它将读取此点编号，然后更新特定的表。

我有以下触发器，但表名 Z01 我想成为一个变量，具体取决于插入的数据。这可能吗？

"b"

Answer 1

这里有一些快速的代码片段可以在触发器中测试动态SQL。看起来很有效！

-- create the tables
create table Readings
(
    id      int identity,
    tbl     varchar(10),
    some_val    int
)

create table Z01
(
    id      int identity,
    some_val    int
)

create table Z02
(
    id      int identity,
    some_val    int
)
go

-- create the insert trigger
CREATE TRIGGER [dbo].[TRG_InsertTest] 
ON [dbo].[Readings]
AFTER INSERT AS
BEGIN
    declare @sql    nvarchar(max)

    select  @sql    = isnull(@sql, '')
            + N'INSERT INTO '  + quotename(tbl) + ' (some_val) VALUES (' + convert(varchar(10), some_val) + ');'
    from    inserted

    exec    sp_executesql @sql
END

GO

-- some testing data
insert into Readings (tbl, some_val) 
select 'Z01', 10    union all
select 'Z01', 11    union all
select 'Z02', 20

select  *
from    Readings

select  *
from    Z01

select  *
from    Z02

Answer 2

你可以这样做 -

 CREATE TRIGGER [dbo].[TRG_InsertTest] 
    ON [dbo].[readings]
    AFTER INSERT AS
    BEGIN
    DECLARE @a varchar(50)
    DECLARE @b int
    DECLARE @c datetime
    DECLARE @d varchar(20)

    SET NOCOUNT ON

    select  @a =  a  FROM INSERTED
    select  @b=  b FROM INSERTED
    select  @c =  c  FROM INSERTED
    select  @d =  d  FROM INSERTED

    If(@a = some condition and @b = some condition )
    begin
    INSERT INTO Z01 
    SELECT * FROM INSERTED
    end

    Else If(@a = some condition and @c = some condition )
    begin
    INSERT INTO Z02 
    SELECT * FROM INSERTED
    end

    Else If(@b = some condition and @d = some condition )
    begin
    INSERT INTO Z03
    SELECT * FROM INSERTED
    end

    Else
    begin
    INSERT INTO Z04
    SELECT * FROM INSERTED
    end
    END

SQL Server触发器 - 变量表名称

2 个答案: