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如何在不修改Doctrine2核心中的DriverManager.php的情况下添加自定义驱动程序？

我已经创建了一个DBAL驱动程序pdo_dblib并将其放在Symfony2包中.这工作正常,但我必须将我的驱动程序添加到DriverManager.php中的硬编码驱动程序列表,否则我得到以下异常:

例外

[Doctrine\DBAL\DBALException]                                                                                                                                                   
The given 'driver' pdo_dblib is unknown, Doctrine currently supports only the following drivers: pdo_mysql, pdo_sqlite, pdo_pgsql, pdo_oci, oci8, ibm_db2, pdo_ibm, pdo_sqlsrv

除非我修改DriverManager.php

final class DriverManager
{
    private static $_driverMap = array(
        'pdo_dblib' => 'Doctrine\DBAL\Driver\PDODblib\Driver', // Added this line
    );
}

这是我的config.yml:

# Doctrine Configuration
doctrine:
    dbal:
        driver:         pdo_dblib
        driver_class:   PDODblibBundle\Doctrine\DBAL\Driver\PDODblib\Driver