Question

我有3张桌子：

校长：PK - ＆gt; PrincipalID

Roles_type ：PK - ＆gt; roles_type

角色：PK - ＆gt; PrincipalID（外键），PK - ＆gt;角色（外键）。

我的实体是：

主体

@Entity
@Table(name = "principals")
@Cache(usage=CacheConcurrencyStrategy.READ_WRITE)
public class Principals implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @javax.persistence.GeneratedValue(strategy=GenerationType.AUTO)
    @Column(name = "PrincipalID", nullable = false)
    private String principalID;
    @OneToMany(fetch = FetchType.LAZY,cascade = CascadeType.ALL, mappedBy = "principals")
    private Collection<Roles> rolesCollection;
}

角色

@Entity
@Table(name = "roles")
@Cache(usage=CacheConcurrencyStrategy.READ_WRITE)
public class Roles implements Serializable {
    private static final long serialVersionUID = 1L;
    @EmbeddedId
    protected RolesPK rolesPK;
    @Column(name = "RoleGroup")
    private String roleGroup;
    @JoinColumn(name = "Role", referencedColumnName = "roles_type", insertable = false, updatable = false)
    @ManyToOne(optional = false)
    private RolesType rolesType;
    @JoinColumn(name = "PrincipalID", referencedColumnName = "PrincipalID", insertable = false, updatable = false)
    @ManyToOne(fetch = FetchType.EAGER)
    private Principals principals;
}

ROLESPK

@Embeddable
public class RolesPK implements Serializable {
    @Column(name = "PrincipalID", nullable = false)
    private String principalID;
    @Column(name = "Role", nullable = false)
    private String role;
}

ROLES_TYPE

@Entity
@Table(name = "roles_type")
@Cache(usage=CacheConcurrencyStrategy.READ_WRITE)
public class RolesType implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @Basic(optional = false)
    @Column(name = "roles_type")
    private String rolesType;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "rolesType")
    private Collection<Roles> rolesCollection;
}

我的代码是为了坚持新的校长：

Principals principals = new Principals();
principals.setPrincipalID("PRINCIPAL");

RolesType rolesType = em.find(RolesType.class, "TYPE_1");

RolesPK rolesPk = new RolesPK();
rolesPk.setPrincipalID(principals.getPrincipalID());
rolesPk.setRole(rolesType.getRolesType());

Collection<Roles> collRoles = new ArrayList<Roles>();
Roles roles  = new Roles();
roles.setRolesType(rolesType);
roles.setRolesPK(rolesPk);
roles.setPrincipals(principals);

collRoles.add(roles);
principals.setRolesCollection(collRoles);
rolesType.setRolesCollection(collRoles);

em.persist(principals);

所以我得到： javax.persistence.PersistenceException：org.hibernate.PersistentObjectException：传递给persist的分离实体：package.entity.Principals

我尝试了很多组合（持久化角色，更改CascadeType等......）

请帮帮我： - ）

Answer 1

解决：我从

更改了Principals.java

    @Id
    @javax.persistence.GeneratedValue(strategy=GenerationType.AUTO)
    @Column(name = "PrincipalID", nullable = false)

到

  @Id
    @Basic(optional = false)
    @Column(name = "PrincipalID")

不能坚持使用Hibernate和3个关系表

1 个答案: