Does YiiDB2 extension work in Yii2?

I’m new to Yii, so forgive me if I am asking the wrong question. I’m enjoying the learning experience.

Are the Yii1.x extensions - specifically YiiDB2 - compatible with Yii2?

I need to support MSSQL, MySQL, PostgreSQL, Oracle, and DB2 (win and as400). All database except DB2 seem to be supported right out of the box. Open to ideas.

Thank in advance.

No, the Yii1 extensions are not compatible with Yii2