有什么解决方案来更改表的列以存储多个值？

Question

We have a table:

message (
`id` INT(11) NOT NULL AUTO_INCREMENT,
`subject` VARCHAR(255) NOT NULL DEFAULT '',
`message` TEXT NOT NULL,
`attachment` VARCHAR(255) NULL DEFAULT NULL,
`new` TINYINT(4) NOT NULL DEFAULT '0',
PRIMARY KEY (`id`)
)

Now we need to have multiple attachments .
Currently only one attachment link is being saved. A solution might be to add another foreign key table or use comma separated values in column. But we need a better solution for this which can use old system alongwith new , without much alteration. Any suggestions?

Answer 1

As @BurhanKhalid says, any solution to this will require changes in your application. You should just to do it right and normalize your data with a separate attachments table with a foreign key. To support legacy app versions , leave the attachment column in the original table alone, then create a trigger to fill it with the first attachment link that gets added to the new, normalized table. Long-term, you want to fix your legacy app to use the new table and then deprecate the old column.

Answer 2

首先，更改表，使attachment的类型为TEXT ，然后序列化附件（例如，作为json或xml）并将其放入attachment列中。