It is possible to delete a file if there is no reference from it in the database using mysql

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Asked 9 years, 8 months ago

Viewed 192 times

2

I wonder if anyone knows any way to create a "trigger" in Mysql that when deleting a table value, delete a file together on the server, for example:

Excludes the item from tbl_imagens whose name is imagem_1001.jpg;
The trigger takes the value imagem_1001.jpg and deletes in the directory uploads/imagem_1001.jpg

Obs:

1

Do you really need to delete a file through Mysql? You cannot use the programming language?

– Renaro Santos

2015/04/15 at 13:56
1

I don’t see much logic in doing this for the bank, and I don’t know if there’s a possibility. As you are working with a programming language make this exclusion with it, will be more coherent.

– Otto

2015/04/15 at 14:10
Yes, and searching, I saw people commenting that can insert linux commands in the trigger. RM for example;

– adrianoAcosta

2015/04/15 at 14:19
Yes, there is a lot of logic in this, you will be avoiding many conditions and queries in a given system that makes use of a complex image chain

– adrianoAcosta

2015/04/15 at 14:23
1

An alternative would be to create a table of imagens_para_excluir. This table could be run from a sheel script that queries this table, removes the files from the disk and truncates that table. You could schedule the execution of this script via cronjob.

– gmsantos

2015/08/04 at 11:34
1

I agree with the comment of @gmsantos. Separation of concepts: Database is for storing data, Filesystem for managing files. Some other layer of the solution should do the file purge.

– OnoSendai

2015/11/14 at 20:04
Managed to solve your problem?

– durtto

2015/12/08 at 11:21

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