Requis la stategy AUTO

<doctrine-mapping xmlns="http://doctrine-project.org/schemas/orm/doctrine-mapping" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://doctrine-project.org/schemas/orm/doctrine-mapping http://doctrine-project.org/schemas/orm/doctrine-mapping.xsd">

    <entity name="UnicaenMail\Entity\Db\Mail" table="unicaen_mail_mail">

        <id name="id" type="integer" column="id"/>

        <id name="id" type="integer" column="id">

            <generator strategy="AUTO"/>

        </id>

        <field name="dateEnvoi"             type="datetime"                   column="date_envoi"           nullable="false"/>

        <field name="statusEnvoi"           type="string"   length="256"      column="status_envoi"         nullable="false"  />