zf2 - Zend\Db - What do Model, Entity, Hydrator, Mapper, TableGateway do and how it all links together?

Question

Please explain what

• Model
• Entity
• TableGateway
• Mapper
• Hydrator

do and how it all works together in zf2 application.

please don't give links to blogs articles. I need simple big picture explenation.

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As far as I understand these are the same:?

Model    == Entity
Hydrator == Mapper

Answer 1

If we take for example one db table. Then:

• Model will represent one row class where class variables would be columns.
• Entity is the same concept as Model used by Doctrine.
• TableGateway is parth from Table Gateway pattern. It will have information about table name. This is place where all query methods will be located. Used in all zf2 examples.
• Mapper is parth from Data Mapper pattern. It is more advanced way of handling the same problem what TableGateway is doing.
• Hydrator is changing your select query row results from array to Model object. If not provided then zf2 will use ArrayObject instead.