C++ database access

[hbhc73]

I'm designing a new large project which uses database intensively.
I'm looking for a c++ library that provides access to databases (such as ilog and dtl) that has the following features:
* unicode support.
* good benchmarks.
* support multithreading.
* high reliability.
* multi-platform.
* supports several db engines (e.g. oracle, sybase, ms sql...).

Does anyone familiar with such library?

TIA,
Yaniv.

[mwilliamson]

There is no multiplatform database standard. For Windows you should look at OleDb. Its the only technology that does everything you mention.