带有注释的休眠：“实体映射中的重复列”-复合 PK

Question

首先，我要感谢所有阅读本文的人。

我的应用程序中的 Hibernate 固件有问题。下图是导致错误的部分数据库示意图。

_{（来源：akamaihd.net）}

我的代码是由逆向工程自动生成的，为了使其正常工作，我必须向代码生成器“显示”module_application 表不是多对多表（使用自定义逆向工程策略）。现在，当我运行我的代码时，我收到以下错误：

Error creating Session: org.hibernate.MappingException: Repeated column in mapping for entity: DAL.module_application.ModuleApplication column: application_id (should be mapped with insert="false" update="false")

ModuleApplication类如下图：

@Entity
@Table(name = "module_application", catalog = "domotics")
public class ModuleApplication implements java.io.Serializable
{

    /**
     * 
     */
    private static final long serialVersionUID = 4725933797587110677L;
    private ModuleApplicationId id;
    private Application application;
    private Module module;
    private Set<ModuleApplicationStatus> moduleApplicationStatuses = new HashSet<ModuleApplicationStatus>(0);

    public ModuleApplication()
    {
    }

    public ModuleApplication(ModuleApplicationId id, Application application, Module module)
    {
        this.id = id;
        this.application = application;
        this.module = module;
    }

    public ModuleApplication(ModuleApplicationId id, Application application, Module module, Set<ModuleApplicationStatus> moduleApplicationStatuses)
    {
        this.id = id;
        this.application = application;
        this.module = module;
        this.moduleApplicationStatuses = moduleApplicationStatuses;
    }

    @EmbeddedId
    @AttributeOverrides(
    {
        @AttributeOverride(name = "networkAddress", column = @Column(name = "network_address", nullable = false, length = 45)),
        @AttributeOverride(name = "applicationId", column = @Column(name = "application_id", nullable = false)) 
    })
    public ModuleApplicationId getId()
    {
        return this.id;
    }

    public void setId(ModuleApplicationId id)
    {
        this.id = id;
    }

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "application_id", nullable = false, insertable = false, updatable = false)
    public Application getApplication()
    {
        return this.application;
    }

    public void setApplication(Application application)
    {
        this.application = application;
    }

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "network_address", nullable = false, insertable = false, updatable = false)
    public Module getModule()
    {
        return this.module;
    }

    public void setModule(Module module)
    {
        this.module = module;
    }

    @OneToMany(fetch = FetchType.LAZY, mappedBy = "moduleApplication")
    public Set<ModuleApplicationStatus> getModuleApplicationStatuses()
    {
        return this.moduleApplicationStatuses;
    }

    public void setModuleApplicationStatuses(Set<ModuleApplicationStatus> moduleApplicationStatuses)
    {
        this.moduleApplicationStatuses = moduleApplicationStatuses;
    }
}

我们可以看到，insert 和 update 都设置为 false。如果有人知道此错误的确切原因和/或如何解决它，请分享知识！

Answer 1

我发现您可能在 [this post] (Hibernate Mapping Exception : Repeated column in mapping for entity) 中遇到了同样的问题。

也许您可以使用代理键作为 id 或使用查询来检索应用程序。

您现在使用的是对象图解决方案，或者您可以使用查询解决方案：

仅将 Application 和 Module 的标识保留为 ModuleApplication 中的字段。您可以使用查询来检索给定 ModuleApplication 的 Application 或 Module

public class ModuleApplication {

    private ModuleApplicationId id;

    private Set<ModuleApplicationStatus> moduleApplicationStatuses = new HashSet<ModuleApplicationStatus>(0);
}

Application application = applicationRepository.findBy(moduleApplication.getApplicationId());