Use core-data and sqlite c based api simulataneously on same db

AFAIK CoreData can be configured to use sqlite in the persistent store.

so as core-data not provides way to query using SQL.

So core-data has sqlite db in background.

Is it safe to access same db using Core-Data and Sqlite c based api same time?

Will it lead to any data corruption is sqllite or any threading issues.

the reason why am I going to use any wrappers such as FMDB or C based API is to query complex data using sql query

Please clarify me.