# DAO

## About

Also known as TDG (Table Data Gateway), it is a Table oriented pattern. *(Oriented to Database a table)*

This pattern is intended to interact with your Database tables and return table records.

{% hint style="info" %}
Following this pattern at risk, DAO methods should not JOIN too many tables.

Too many JOINs allows you to create too many table combinations, thus losing the expected data returned.

*Ex.: What do you espect of an* `Employee DAO`*? You expect returned data to be of Employees, not Employees and Branches data, or Employees and Roles data.*
{% endhint %}