Does livecycle es2 9.0 work with sql server 2012?

No, it is only supported by LiveCycle ES4 SP1(11.0.1) : LiveCycle Help | Adobe LiveCycle ES4 Supported Platforms

-Wasil

I'd suggest not to try that as there is dependency on particular version of JDBC drivers for a particular database. Because of mismatch there could be unpredictable issues.

Also, it is not an officially supported configuration.

Thanks

Wasil