在Zend框架2中生成实体形成现有数据库

Question

I already have a database with two tables "Album" and "Email". I tried to generate orm and entities from that using commands.

First I used the following command to generate orm

/opt/lampp/bin/php ./vendor/doctrine/doctrine-module/bin/doctrine-module orm:convert-mapping --from-database php ./module/Album/src/Album/Entity

That creates orm files as follows..

use Doctrine\ORM\Mapping\ClassMetadataInfo;

 $metadata->setInheritanceType(ClassMetadataInfo::INHERITANCE_TYPE_NONE);
 $metadata->setPrimaryTable(array(
    'name' => 'Album',
   ));
 $metadata-   
>setChangeTrackingPolicy(ClassMetadataInfo::CHANGETRACKING_DEFERRED_IMPLICIT);
 $metadata->mapField(array(
    'fieldName' => 'id',
    'columnName' => 'id',
    'type' => 'integer',
    'nullable' => false,
    'unsigned' => false,
   'comment' => '',
   'id' => true,
  ));
$metadata->mapField(array(
   'fieldName' => 'artist',
   'columnName' => 'artist',
   'type' => 'string',
   'nullable' => false,
   'length' => 255,
   'fixed' => false,
   'comment' => '',
  ));
$metadata->mapField(array(
   'fieldName' => 'title',
   'columnName' => 'title',
   'type' => 'string',
   'nullable' => false,
   'length' => 255,
   'fixed' => false,
   'comment' => '',
  ));
$metadata->setIdGeneratorType(ClassMetadataInfo::GENERATOR_TYPE_IDENTITY);

After that I run the below command to generate entities from that orm files

/opt/lampp/bin/php ./vendor/doctrine/doctrine-module/bin/doctrine-module orm:generate-entities /modules/Album/src/Album/Entity

But, the last command returns the error in command prompt like..

Notice: Undefined variable: metadata in /opt/lampp/htdocs/ZendSkeleton/module/Album/src/Album/Entity/Album.php on line 5

Fatal error: Call to a member function setInheritanceType() on a non-object in /opt/lampp/htdocs/ZendSkeleton/module/Album/src/Album/Entity/Album.php on line 5

The $metadata variable is undefined...

Is there any thing wrong in what I did...?

How should I proceed next...? Please help me....