dbal_schema_filter.xml

<?xml version="1.0" ?>

<srv:container xmlns="http://symfony.com/schema/dic/doctrine"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:srv="http://symfony.com/schema/dic/services"
    xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd
                        http://symfony.com/schema/dic/doctrine http://symfony.com/schema/dic/doctrine/doctrine-1.0.xsd">

    <config>
        <dbal default-connection="connection1">
            <connection name="connection1" schema-filter="~^(?!t_)~" />
            <connection name="connection2" />
            <connection name="connection3" />
        </dbal>
    </config>
</srv:container>