Tony Tony - 1 month ago 7
Java Question

Hibernate soft deletion for child table

Assume we have two entities Customer and AppUser, they are One-To-Many relationship.

Customer Entity:

@Entity
@Table(name = "CUSTOMER")
//Override the default Hibernation delete and set the deleted flag rather than deleting the record from the db.
@SQLDelete(sql="UPDATE customer SET deleted = '1' WHERE id = ?")
//Filter added to retrieve only records that have not been soft deleted.
@Where(clause="deleted <> '1'")
public class Customer implements java.io.Serializable {
private long id;
private Billing billing;
private String name;
private String address;
private String zipCode;
private String city;
private String state;
private String notes;
private char enabled;
private char deleted;
private Set appUsers = new HashSet(0);

//Constructors...

//Getters and Setters...

@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "customer")
//Filter added to retrieve only records that have not been soft deleted.
@Where(clause="deleted <> '1'")
public Set getAppUsers() {
return this.appUsers;
}
public void setAppUsers(Set appUsers) {
this.appUsers = appUsers;
}
}


AppUser Entity:

@Entity
@Table(name = "APP_USER")
//Override the default Hibernation delete and set the deleted flag rather than deleting the record from the db.
@SQLDelete(sql="UPDATE app_user SET deleted = '1' WHERE id = ?")
//Filter added to retrieve only records that have not been soft deleted.
@Where(clause="deleted <> '1'")
public class AppUser implements java.io.Serializable {
private long id;
private Customer customer;
private AppRole appRole;
private char enabled;
private String username;
private String appPassword;
private Date expirationDate;
private String firstName;
private String lastName;
private String email;
private String phone;
private String fax;
private char deleted;
private Set
persons = new HashSet(0);

//Constructors...

//Getters and Setters...
}


The soft deletion works well for both of them.

My question is that how can I soft delete the AppUser when I remove one item from the set of Customer, then I saveOrUpdate the Customer entity, for example:

Customer customer = getCustomerById(id);
Set<AppUser> appUsers = customer.getAppUsers();


assume now we have four appUsers, then

appUsers.remove(oneItem)

saveCustomer(customer);


Now, the deleted appUser was hard deleted from database, and remain three records. I still want to use soft deletion to handle such case, someone can help on it?

Answer

Finally, I found the answer, add @SQLDelete for the collection of Customer class.

@SQLDelete(sql="UPDATE customer SET deleted = '1' WHERE id = ?")
@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "customer")
//Filter added to retrieve only records that have not been soft deleted.
@Where(clause="deleted <> '1'")
    public Set getAppUsers() {
    return this.appUsers;
}

Hibernate doc link: http://docs.jboss.org/hibernate/stable/annotations/reference/en/html_single/#entity-hibspec-filters