app/src/main/java/User/UserDao.java


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package User;

import android.arch.persistence.room.Dao;
import android.arch.persistence.room.Insert;
import android.arch.persistence.room.OnConflictStrategy;
import android.arch.persistence.room.Query;

@Dao
public interface UserDao {
    @Insert(onConflict = OnConflictStrategy.REPLACE)
    void insert(User user);

    @Query("DELETE FROM users")
    void deleteAllUsers();

    @Query("SELECT * FROM users WHERE user_name = :userName LIMIT 1")
    User getUserData(String userName);
}