--- /dev/null
+<?php
+
+use Doctrine\ORM\Mapping\ClassMetadataInfo;
+
+$metadata->mapField(array(
+ 'id' => true,
+ 'fieldName' => 'id',
+));
+
+$metadata->setDiscriminatorColumn(array(
+ 'name' => "dtype",
+ 'columnDefinition' => "ENUM('ONE','TWO')"
+));
+
+$metadata->setIdGeneratorType(ClassMetadataInfo::GENERATOR_TYPE_NONE);
\ No newline at end of file