Crudin is a mature system written in PHP that reads a MySQL database and dynamicly generates an interface with CRUD (Create,Read,Update and Delete) features. You can use it to save hours and hours of programming when you have to build a custom CMS system, extranet, or when you have to manage the content contained in a MySQL database. Crudin doesn't generate PHP files; it directly generates the interface. With a change in the database, the system automatically fits without any programming.
PDO4You is a class that implements the Singleton design pattern for connecting the database using the PDO extension (PHP Data Objects). It provides an abstraction layer for accessing data, regardless of which database you are using, and ensures that there is a single object instance per database connection. It can connect to several possible SQL databases using the available PDO drivers. Currently it supports MySQL, PostgreSQL, SQLite, MariaDB, Oracle, Microsoft SQL server, Sybase, and CUBRID (a database highly optimized for Web applications). The class can also execute multiple queries at once given a string in JSON format that specifies the type of query, the tables, fields, field values, conditions, etc.