Criterion of sleep mode: search by content in the list of properties in the organization

Question

I want to search by content in a property in essence

I have a simple class to define a user:

@Entity
public class User {

    @Id
    @Column(name = "pers_id")
    private int persId; 

    @Column(name = "full_name")
    private String fullName;    

    @OneToMany
    @JoinColumn(name = "PERS_ID")
    private List<UserLanguages> languages = new ArrayList<UserLanguages>();
}

A user can have several languages, here is a class to make a link between the user and the language.

@Entity
public class UserLanguages {
    @Column(name="pers_id")
    private int persId; 

    @Id
    @Column(name="lang_iso_code")
    private String langISO;

    @Column(name="lang_full_name")
    private String langFullName;

    @Column(name="order_seq")
    private int order;
}

@Entity
public class Language {
    @Id 
    @Column(name="ID")
    private long id;

    @Column(name = "CODE")  
    private String code;
}

I created an object to search for:

public class UserFilter {    
    private String name;

    private List<Language> languages;
}

I defined a service:

@Service("userService")
public class UserServiceImpl implements UserService {

@Override
public List<User> findByFilter(UserFilter userFilter) {
    final Criteria criteria = userDao.createCriteria();
    if (userFilter.getName() != null) {
        for (final String token : userFilter.getName().toLowerCase().trim().split(" ")) {
        criteria.add(Restrictions.like("fullName", "%" + token + "%"));
        }
    }

    if (null != userFilter.getLanguages() && userFilter.getLanguages().size() > 0) {

        final List<String> contents = new ArrayList<String>(userFilter.getLanguages().size());
        for (final Language lang : userFilter.getLanguages()) {
        contents.add(lang.getCode());
        }    
        criteria.add(Restrictions.in("languages", contents));
    }

    return userDao.findByCriteria(criteria);
}

My question is: how can I do a search in languages. I want to find all users with these or thoses languages ​​defined in the userFilter parameter. The part about languages ​​does not work in the findByFilter method in the service. Can you help me?

Answer 1

First of all, the object UserLanguagesmust have a name UserLanguage: it represents one language, not several.

pers_id User. ManyToOne User, .

, (, , , langISO contents): :

// inner join between User and UserLanguages
criteria.createAlias("languages", "userLanguage"); 
// restriction on the langISO property of UserLanguage
criteria.add(Restrictions.in("userLanguage.langIso", contents));