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POhibernate update object partially
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  1. POhibernate update object partially
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    copied!<p>I have this model and hibernate mapping:</p> <pre><code>@Entity @Table(name = "candidate") public class Candidate extends Person { private Set&lt;Vacancy&gt; vacancies= new HashSet&lt;Vacancy&gt;(); @ManyToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER) @JoinTable(name = "candidate_vacancy", joinColumns = @JoinColumn(name = "candidate_id"), inverseJoinColumns = @JoinColumn(name = "vacancy_id")) public Set&lt;Vacancy&gt; getVacancies() { return vacancies; } public void setVacancies(Set&lt;Vacancy&gt; vacancies) { this.vacancies = vacancies; } } </code></pre> <p>Person class:</p> <pre><code> @MappedSuperclass public abstract class Person { private Integer id; private String name; @Id @GeneratedValue(strategy = GenerationType.IDENTITY ) @Column (name = "id") public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } @Column(name = "name") @NotEmpty public String getName() { return name; } public void setName(String name) { this.name = name; } } </code></pre> <p>vacancy mapping </p> <pre><code>@Entity @Table(name = "vacancy") @XmlRootElement(name="vacancy") public class Vacancy { ... @ManyToMany(mappedBy = "vacancies", fetch = FetchType.EAGER) public Set&lt;Candidate&gt; getCandidates() { return candidates; ... } } </code></pre> <p>And I have so html form:</p> <pre><code>&lt;form action="saveCandidate" method="POST"&gt; name: &lt;input type="text" value="${candidate.name}" name="name" /&gt; &lt;input type="hidden" name="id" value="${candidate.id}"&gt; &lt;input type="submit" value="save changes" /&gt; &lt;/form&gt; </code></pre> <p>I handle my form in my @controller method:</p> <pre><code> public String saveCandidate(Model model, @ModelAttribute Candidate candidate) { candidateService.update(candidate); return "candidateMenu"; } </code></pre> <p>Using this way, I have problem. vacancies related for candodate delete from my database. I fix it so:</p> <pre><code>public String saveCandidate(Model model, @ModelAttribute Candidate candidate) { Candidate candidate2 = candidateService.findById(candidate.getId()); candidate.setName(candidate2.getName()); candidate.setSurname(candidate2.getSurname()); candidate.setPhone(candidate2.getPhone()); candidate.setResumeUrl(candidate2.getResumeUrl()); candidateService.update(candidate2); return "candidateMenu"; } </code></pre> <p>But I think it is very bad way for solving my problem. </p> <p>P.S. I know that fetchType.lazy is bad, but I don't want replace it.</p>
 

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