Adding custom mapping types in doctrine

While working in some enhancements for my startup Careerise, I had an issue with doctrine not recognising the mysql data type “blob“.

The error I was getting while running doctrine diff was :

  Unknown database type blob requested, Doctrine\DBAL\Platforms\MySqlPlatform may not support it.

In order to overcome the issue, I had to add the blob data type to doctrine.

Step 1 :

Creating a class to handle the blob type.

path : Doctrine/DBAL/Types/BlobType.php

file content :

namespace Doctrine\DBAL\Types;
use Doctrine\DBAL\Platforms\AbstractPlatform;

 * Type that maps a database BLOB to an encoded base64 value
 * @author Ahmed

class BlobType extends Type

    public function getName ()
        return TYPE::BLOB;

    public function getSQLDeclaration (array $fieldDeclaration,
            AbstractPlatform $platform)
        return $platform-&gt;getDoctrineTypeMapping('BLOB');

    public function convertToDatabaseValue ($value, AbstractPlatform $platform)
        return ($value === null) ? null : base64_encode($value);

    public function convertToPHPValue ($value, AbstractPlatform $platform)
        return ($value === null) ? null : base64_decode($value);

Step 2: Add the blob type name to the Type abstract class

File Path : Doctrine/DBAL/Types/Type.php

    const BLOB = 'blob';

Step 3: Modify the DoctrineTypeMappings for mysql

File Path: Doctrine/DBAL/Platforms/MySqlPlatform.php

Append the blob type to the end of the array, ex :

protected function initializeDoctrineTypeMappings()
        $this->doctrineTypeMapping = array(
            'tinyint'       => 'boolean',
            'smallint'      => 'smallint',
            'mediumint'     => 'integer',
            'int'           => 'integer',
            'integer'       => 'integer',
            'bigint'        => 'bigint',
            'tinytext'      => 'text',
            'mediumtext'    => 'text',
            'longtext'      => 'text',
            'text'          => 'text',
            'varchar'       => 'string',
            'string'        => 'string',
            'char'          => 'string',
            'date'          => 'date',
            'datetime'      => 'datetime',
            'timestamp'     => 'datetime',
            'time'          => 'time',
            'float'         => 'float',
            'double'        => 'float',
            'real'          => 'float',
            'decimal'       => 'decimal',
            'numeric'       => 'decimal',
            'year'          => 'date',
            'blob'          => 'blob',

now doctrine will be able to recognise the mysql data type blob.

the documentation here was helpful in some of the steps above : Custom Mapping Types

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