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Editorial Team
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Asked: 2026-05-29T12:29:48+00:00

I’ve been working with Doctrine 2 ORM for some time, and there’s something I’ve

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I’ve been working with Doctrine 2 ORM for some time, and there’s something I’ve never quite understood.

What purpose does the Doctrine DBAL (database abstraction layer) serve? PDO itself a database abstraction layer, so why can’t the ORM work directly with PDO?

I’m not trying to find a way around using DBAL or anything. I’ve just never understood why the extra layer is needed, and can’t seem to find a clear answer in the documentation.

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  1. Editorial Team

    No, PDO is a “data-access layer”, not a “database abstraction layer”. Meaning that you can switch databases and still make the same method calls, but PDO will not re-write sql queries to match the selected database or emulate any database functionality.

    Per PHP PDO docs:

    PDO provides a data-access abstraction layer, which means that, regardless of which database you’re using, you use the same functions to issue queries and fetch data. PDO does not provide a database abstraction; it doesn’t rewrite SQL or emulate missing features. You should use a full-blown abstraction layer if you need that facility.

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