error persist generate exist id doctrine code example

Example 1: doctrine orm get all

$records = $em->getRepository("Entities\YourTargetEntity")->findAll();

Example 2: doctrine getrepository findby

$em->getRepository('myentitity')
       ->findBy(
           array(
             'field1' =>array( 'value1','value2'),
             'field2' => 'value3'
           )       // $where   
  			      
         );