Mysql

Regardless of how you feel about empty strings, you should be aware of the implications of allowing them on objects that will be persisted. While it seems reasonable to expect a database to store the exact value that you give it, that is unfortunately not always the case. If you’re going to allow empty strings on persistent objects, you should take the time to determine the behavior of the database management system you’re using. You should also assess how likely it is that you are going to either have to support multiple databases, or that you will switch to another database management system in the future.