Question

我为单行插入创建了一个触发器，但它不适用于多行插入。

这是我的表：

create table tb_pengiriman
(
    id_pengiriman char(5) not null primary key
        constraint cek_id_pengiriman check (id_pengiriman like('PE[0-9][0-9][0-9]')),
    provinsi varchar(30) not null,
    kota varchar(30) not null,
    harga_ongkir bigint null
        constraint cek_harga_ongkir check (harga_ongkir >-1)
);

alter table tb_pengiriman add
    constraint cek_kota_banten 
    check ((provinsi = 'Banten') and (kota in ('Tangerang','Serang','Cilegon','Tangerang Selatan'))),

这是触发器：

create trigger tr_pengiriman
on tb_pengiriman
after insert
as
    begin

        declare @id_pengiriman char(5), 
                @provinsi varchar(30), 
                @kota varchar(30);

        select @id_pengiriman = id_pengiriman from inserted;
        select @provinsi = provinsi from inserted;
        select @kota = kota from inserted;
        exec sp_pengiriman @id_pengiriman,@provinsi,@kota;

    end
    go

    create procedure sp_pengiriman
    @id_pengiriman char(5), 
    @provinsi varchar(30), 
    @kota varchar(30)
    As
    Begin
        --proses kalkulasi ongkos kirim
        if(@kota = 'Tangerang')
        begin
            update tb_pengiriman 
            set harga_ongkir = 20000 
            where id_pengiriman = @id_pengiriman
        end
        else if(@kota = 'Serang')
        begin
            update tb_pengiriman 
            set harga_ongkir = 50000 
            where id_pengiriman = @id_pengiriman
        end
        else if(@kota = 'Tangerang Selatan')
        begin
            update tb_pengiriman 
            set harga_ongkir = 15000 
            where id_pengiriman = @id_pengiriman
        end
        else if(@kota = 'Cilegon')
        begin
            update tb_pengiriman 
            set harga_ongkir = 30000 
            where id_pengiriman = @id_pengiriman
        end
        else 
        begin
            rollback transaction
            print 'kota tidak terdaftar'
        end
    end
    go

此代码适用于单行插入，但是当我尝试执行多行插入时，所有行都会更改为相同的触发器过程更新查询。

如何使此查询适用于多行插入以及单行插入？

Answer 1

您可以通过使用计算列简化大约1000％。这里根本不需要触发器。您的约束强制kota的值只是这四个值中的一个。这应该完成你想要做的事情而不需要任何触发器等。

create table tb_pengiriman
(
    id_pengiriman char(5) not null primary key
        constraint cek_id_pengiriman check (id_pengiriman like('PE[0-9][0-9][0-9]')),
    provinsi varchar(30) not null,
    kota varchar(30) not null,
    harga_ongkir as case kota when 'Tangerang' then 20000 
                        when 'Serang' then 50000
                        when 'Tangerang Selatan' then 15000
                        when 'Cilegon' then 30000
                        end persisted
        constraint cek_harga_ongkir check (harga_ongkir >-1)
);

如何在插入触发器sql后创建multirow

1 个答案: