code: func (db *DB) Unsafe() *DB {
  	return &DB{DB: db.DB, driverName: db.driverName, unsafe: true, Mapper: db.Mapper}
  }
docs: // Unsafe returns a version of DB which will silently succeed to scan when
  // columns in the SQL result have no fields in the destination struct.
  // sqlx.Stmt and sqlx.Tx which are created from this DB will inherit its
  // safety behavior.