Question

我在播放框架中使用了ebean，我在映射2个连接表之间的多对多关系时遇到了问题。假设我们有3个实体，人，公司和专业。一个人可以有很多职业。一个人可以为许多公司工作。公司可以雇佣许多职业的人员。

这是我的代码：

@Entity
public class Company extends Model {

    @Id
    public Long id;

    @OneToMany(fetch = FetchType.LAZY, mappedBy = "company")
    public List<CompanyPerson> companyPersons;

    @OneToMany(fetch = FetchType.LAZY, mappedBy = "company")
    public List<CompanyProfession> companyProfessions;
    ...
}

@Entity
public class Profession extends Model {

    @Id
    public Long id;

    @OneToMany(fetch = FetchType.LAZY, mappedBy = "profession")
    public List<CompanyProfession> companyProfessions;
    ...
}

@Entity
public class Person extends Model {

    @Id
    public Long id;

    @OneToMany(fetch = FetchType.LAZY, mappedBy = "person")
    public List<CompanyPerson> companyPersons;
    ...
}

@Entity
public class CompanyPerson extends Model {

    @EmbeddedId
    public CompanyPersonId id = new CompanyPersonId();

    @ManyToOne
    @JoinColumn(name = "company_id")
    private Company company;

    @ManyToOne
    @JoinColumn(name = "person_id")
    private Person person;

    @ManyToMany(mappedBy = "companyPersons")
    public List<CompanyProfession> companyProfessions;
    ...
}

@Entity
public class CompanyProfession extends Model {

    @EmbeddedId
    public CompanyProfessionId id = new CompanyProfessionId();

    @ManyToOne
    @JoinColumn(name = "company_id")
    private Company company;

    @ManyToOne
    @JoinColumn(name = "profession_id")
    private Person person;

    @ManyToMany(cascade = CascadeType.ALL)
    public List<CompanyPerson> companyPersons;
    ...
}

我收到以下错误：

注入构造函数时出错，javax.persistence.PersistenceException：在[models.CompanyProfession.companyPersons]上加入时出错。找不到[null]的本地匹配可能是@JoinColumn中的错误 at play.db.ebean.EbeanDynamicEvolutions。（EbeanDynamicEvolutions.java:36）

我尝试添加JoinColumn（name =＆＃34; companyperson_id＆＃34;）但这只是将错误从[null]更改为[companyperson_id]。不知道该怎么做。有什么帮助吗？

加入表中的Ebean ManyToMany？

0 个答案: