Consider i have 2 database that have same field.
first database is for export data,
second database act as copy have database
Database 1 will export database in file format csv that output from PHP Script.
Database 2 will import database from php script.
There is two table is in each database that relations with foreign key.
table_transaction
create table `table_transaction` (
`id` int auto_increment primary key
`date` DATE default now()
) engine = innoDB;
sample data
id | date
1 | 2012-12-31
2 | 2012-12-30
3 | 2012-12-29
table_transaction_product
create table `table_transaction_product` (
`id` int auto_increment primary key
`product` string NOT NULL default '' /* Product Name */
`fk_transaction` int auto_increment NOT NULL
foreign key (`fk_transaction`)
references table_transaction(`id`)
on update cascade
on delete cascade
) engine = innoDB;
sample data
id | product | fk_transaction
1 | shampoo | 1
2 | soap | 1
3 | conditioner | 1
And this is sample exported CSV from database 1 and will be imported to table 2, that exporting transaction id 1.
insert into table_transaction (id, date) values (1, '2012-12-31');
insert into table_transaction_product (id, product, fk_transaction)
values
(1, 'shampoo', 1),
(2, 'soap', 1),
(3, 'conditioner', 1)
Question
Since the ID
both table is auto_increment
. Isn't there will be any problem that i insert manually the table. id
and crash the auto_increment mysql system? But if didn't input the ID and let's mysql decide it, then the foreign key will be not match. What should i do?
Thank you.
它应该不会造成问题,但我建议您更改第二个数据库上的表定义,以删除auto_increment标志。
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