| Drivers |
| Driver_Interface | PDO Interface to implement for database drivers |
| SQL_Interface | parent for database manipulation subclasses |
| Query_Builder_Interface | Interface defining the Query Builder class |
| Abstract_Util | Abstract class defining database / table creation methods |
| Abstract_SQL | parent for database manipulation subclasses |
| BadDBDriverException | Generic exception for bad drivers |
| Abstract_Query_Builder | Abstract Class for internal implementation methods of the Query Builder |
| Connection_Manager | Connection manager class to manage connections for the Query method |
| Query_Parser | Utility Class to parse sql clauses for properly escaping identifiers |
| Abstract_Driver | Base Database class |
| Query_Builder | Convenience class for creating sql queries - also the class that instantiates the specific db driver |