liferay-6.1 - Implement own service

Hey I have create my own service.xml with student. Now o want to add my own searchByName method for student. can you please explain me what to write in StudentLocalServiceImpl.

 public class StudentLocalServiceImpl extends StudentLocalServiceBaseImpl {
/*
 * NOTE FOR DEVELOPERS:
  *
 */

public List<Student> getAll() throws SystemException {
    return studentPersistence.findAll();
}

public Student getStudentByName(String name) {
    return studentPersistence.
}

// I have created one method getAll.
I need help for the another one.
Thanks in Advance.