Add ODBC support for DbUnit

[sebastianbergmann]

Copied from http://www.phpunit.de/ticket/551

[ashnazg]

Would this enhancement be more complex than just implementing an 'odbc' option for the MetaData class? I recognize that an ODBC layer here would actually have to sit between the MetaData parent and various per-vendor children, since "odbc" is not a db vendor itself. But in thinking out just the MetaData needs for 'odbc', I worry that there might be tons more implementation needed in DbUnit/PHPUnit, and thus need to ask the question. If it is indeed limited to MetaData, I might can take a crack at it.

(it is #170 that makes me think perhaps it's only a MetaData layer that's needed here)

With DBLIB no longer being a viable option to reach SQL Server from Linux, and the release of Microsoft's native ODBC driver for Linux, this old enhancement need may become more important.

[sebastianbergmann]

I don't know. I never really looked at the implementation of DbUnit, sorry.