By prasunsen
via cool-php-tutorials.blogspot.com
Submitted: Mar 20 2013 / 13:39
When building an installation script for your software you usually have to create the required database tables. This is easy to do with running simple DB queries. Works great when installing first version. But once you have to start upgrades it can quickly become a nightmare. Of course you can't always create the tables from scratch because the user might already have some data in them! So you have to update them by adding the new fields only.
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