Migrate metadata from legacy database to CRM

Hi all,

I have an SQL database with around 100 tables, I'd like re-create them in CRM as entities. Using CRM user interface to create new entities taking too long. Is there a way to convert the SQL Create table script to XML schema for metadata and load into CRM ?

Conversely, is there a scriptable way to remove entities and field (similar like Drop table in sql)

At this point, I don't need to create any extra stuffs in entities like custom forms or securities just yet, so there is no dependencies to be removed.

Thanks