class Person {
    String frstName
    String lastName
    Integer age
}

class Person {
    String frstName
    String lastName
    Integer age
    static mapping = {
        id column:'person_id'
        frstName column:'person_frst_name'
        lastName column:'person_last_name'
        age column:'person_age'
        version false
    }
}

class Person {
    String frstName
    String lastName
    Integer age
    static mapping = {
          table 'people'
    }
}