If you're looking for a simple tool that uses Zend Framework's robust database classes (such as Zend_Db and Zend_Db_Table), you can check out zdbform. It's a short yet effective library that let's you perform simple administration tasks on your database, with minimal coding. It's not a full blown phpMyAdmin, but it's a simple way to view, edit and add your tables rows on a web interface.

He shows how you can use it in a script - from the front controller to the input forms - and some of the changes he needed to make in the form class itself to handle a few of the bit more tricky parts.