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POManyToMany Mapping (Helper Table) + extra Field + Composite Primary Key
 

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  1. POManyToMany Mapping (Helper Table) + extra Field + Composite Primary Key
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    <p>I'm trying to realise this table structure:</p> <p><a href="http://www.img-teufel.de/uploads/Unbenannt1d4f8a349jpg.jpg" rel="nofollow">http://www.img-teufel.de/uploads/Unbenannt1d4f8a349jpg.jpg</a></p> <p>(not embedded due to size)</p> <p>It creates my classes how i want, except there's no composite primary key in tbl_license_user_alerts.</p> <p>So, how to create one in my case?</p> <p>tbl_license:</p> <pre><code>@Entity @Table( name = "tbl_license" ) public class License implements Serializable { private static final long serialVersionUID = 1L; @Id @GeneratedValue @Column( name = "id", nullable = false, columnDefinition = "serial" ) private int id; @ElementCollection @JoinTable( name = "tbl_license_user_alert" ) private List&lt;LicenseUserAlert&gt; alerts; public int getId() { return id; } public void setId( int id ) { this.id = id; } public List&lt;LicenseUserAlert&gt; getAlerts() { return alerts; } public void setAlerts( List&lt;LicenseUserAlert&gt; alerts ) { this.alerts = alerts; } } </code></pre> <p>tbl_user:</p> <pre><code>@Entity @Table( name = "tbl_user" ) public class User implements Serializable { private static final long serialVersionUID = 1L; @Id @GeneratedValue @Column( name = "id", nullable = false, columnDefinition = "serial" ) private int id; @ElementCollection @JoinTable( name = "tbl_license_user_alert" ) private List&lt;LicenseUserAlert&gt; alerts; public int getId() { return id; } public void setId( int id ) { this.id = id; } public List&lt;LicenseUserAlert&gt; getAlerts() { return alerts; } public void setAlerts( List&lt;LicenseUserAlert&gt; alerts ) { this.alerts = alerts; } } </code></pre> <p>tbl_license_user_alert:</p> <pre><code>@Embeddable public class LicenseUserAlert implements Serializable { private static final long serialVersionUID = 1L; @ManyToOne @JoinColumn( name = "license_id"/*, columnDefinition = "int"*/ ) private License license; @ManyToOne @JoinColumn( name = "user_id"/*, columnDefinition = "int"*/ ) private User user; @Column( name = "timer", nullable = false, columnDefinition = "int default 86400" ) private int timer = 86400 public License getLicense() { return license; } public void setLicense( License license ) { this.license = license; } public User getUser() { return user; } public void setUser( User user ) { this.user = user; } public int getTimer() { return timer; } public void setTimer( int timer ) { this.timer = timer; } } </code></pre> <p><strong>EDIT:</strong></p> <p>@danny.lesnik Then I'm getting an exception: org.hibernate.AnnotationException: com.example.my.entities.license.LicenseUserAlertId must not have @Id properties when used as an @EmbeddedId: com.example.my.entities.user.User.alerts.collection&amp;&amp;element.id</p> <pre><code>@Embeddable public class LicenseUserAlert implements Serializable { private static final long serialVersionUID = 1L; @EmbeddedId private LicenseUserAlertId id; @Column( name = "timer", nullable = false, columnDefinition = "int default 86400" ) private int timer = 86400; public LicenseUserAlertId getId() { return id; } public void setId( LicenseUserAlertId id ) { this.id = id; } public License getLicense() { return id.getLicense(); } public void setLicense( License license ) { id.setLicense( license ); } public User getUser() { return id.getUser(); } public void setUser( User user ) { id.setUser( user ); } public int getTimer() { return timer; } public void setTimer( int timer ) { this.timer = timer; } } </code></pre> <p>IdClass:</p> <pre><code>@Embeddable public class LicenseUserAlertId implements Serializable { private static final long serialVersionUID = 1L; @ManyToOne @JoinColumn( name = "license_id"/*, columnDefinition = "int"*/ ) private License license; @ManyToOne @JoinColumn( name = "user_id"/*, columnDefinition = "int"*/ ) private User user; public License getLicense() { return license; } public void setLicense( License license ) { this.license = license; } public User getUser() { return user; } public void setUser( User user ) { this.user = user; } } </code></pre>
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