Java 保存中间表时出错_Java_Jpa

Java 保存中间表时出错

java jpa

Java 保存中间表时出错,java,jpa,Java,Jpa,我有这个相关的实体 Entity.java @Entity @Table(name = "entity") public class Entidad extends BaseEntity { /** * Serial */ private static final long serialVersionUID = 3453805453717178734L; protected String name; protected String im

我有这个相关的实体

Entity.java

@Entity
@Table(name = "entity")
public class Entidad extends BaseEntity {

    /**
     * Serial
     */
    private static final long serialVersionUID = 3453805453717178734L;

    protected String name;

    protected String image;

    protected String notes;

    @OrderBy("id")
    @ManyToMany
    protected Set<EntityHeader> headersType = new HashSet<EntityHeader>();

    //Getters and setters
}

@Entity
@Table(name = "header_type")
public class HeaderType extends BaseEntity {

    /**
     * Serial
     */
    private static final long serialVersionUID = -7471230510640592406L;

    private String name;

    @OrderBy("id")
    @ManyToMany
    private Set<EntityHeader> entities = new HashSet<EntityHeader>();

    //Getters and setters
}

@Entity
@Table(name = "entity_header")
public class EntityHeader implements Serializable{

    /**
     * Serial
     */
    private static final long serialVersionUID = 1710372870796468955L;

    @Id
    @ManyToOne
    private Entidad entity;

    @Id
    @ManyToOne
    private HeaderType headerType;

    private String value;

    //Getters and setters

}

@Entity
@Table(name = "entity")
public class Entidad extends BaseEntity {

    /**
    * Serial
    */
    private static final long serialVersionUID = 3453805453717178734L;

    @Id
    //@GeneratedValue(strategy= GenerationType.TABLE) -- this annotations enables automatic generation for table ids
    protected Long id;

    protected String name;

    protected String image;

    protected String notes;

    @OrderBy("id")
    @OneToMany(mappedBy = "entity")
    protected Set<EntityHeader> headersType = new HashSet<EntityHeader>();

    //Getters and setters
}

@Entity
@Table(name = "header_type")
public class HeaderType extends AbstractBasicEntity {

    /**
     * Serial
     */
    private static final long serialVersionUID = -7471230510640592406L;

    @Id
    //@GeneratedValue(strategy= GenerationType.TABLE) -- this annotations enables automatic generation for table ids
    protected Long id;

    private String name;

    @OrderBy("id")
    @OneToMany(mappedBy = "headerType")
    private Set<EntityHeader> entities = new HashSet<EntityHeader>();

    //Getters and setters
}

@Entity
@Table(name = "entity_header")
public class EntityHeader implements Serializable{

    /**
     * Serial
     */
    private static final long serialVersionUID = 1710372870796468955L;

    @Id
    private Long id;

    @ManyToOne
    @JoinColumn
    private Entidad entity;

    @ManyToOne
    @JoinColumn
    private HeaderType headerType;

    private String value;

    //Getters and setters
}

因此，当我想保存一个没有EntityHeader数据的实体时，它会做得很好，但是，如果我尝试设置EntityHeader字段并保存它（保存person或单独保存EntityHeader并使用Entity和HeadersType的正确值），我会得到以下消息：

org.hibernate.TypeMismatchException:为提供的id类型错误类es.paquete.basicas.entidades.intermedias.EntityHeader。预期：类es.paquete.basicas.entidades.intermedias.EntityHeader，获得类 java.lang.Long

编辑：主要类的ID在BaseEntity中

EntityHeader上的主键没有意义：

@Id注释

指定实体的主键。指向的字段或属性应用的Id注释应为以下类型之一：任意 Java原语类型；任何原始包装类型；一串 java.util.Date；java.sql.Date；java.math.BigDecimal； java.math.biginger

看看

您需要查看实体的主键，以便它们也可以相互引用。

我认为，要使这些实体正常工作，必须解决一些问题：

每个实体必须有自己的@Id字段
感觉“很多关系”都不合适；实际上，每个EntityHeader和每个HeaderType都与它们的EntityHeader有一对多的关系

我认为你们的课程应该是这样的：
Entidad.java

@Entity @Table(name = "entity") public class Entidad extends BaseEntity { /** * Serial */ private static final long serialVersionUID = 3453805453717178734L; protected String name; protected String image; protected String notes; @OrderBy("id") @ManyToMany protected Set<EntityHeader> headersType = new HashSet<EntityHeader>(); //Getters and setters }

@Entity @Table(name = "header_type") public class HeaderType extends BaseEntity { /** * Serial */ private static final long serialVersionUID = -7471230510640592406L; private String name; @OrderBy("id") @ManyToMany private Set<EntityHeader> entities = new HashSet<EntityHeader>(); //Getters and setters }

@Entity @Table(name = "entity_header") public class EntityHeader implements Serializable{ /** * Serial */ private static final long serialVersionUID = 1710372870796468955L; @Id @ManyToOne private Entidad entity; @Id @ManyToOne private HeaderType headerType; private String value; //Getters and setters }

@Entity @Table(name = "entity") public class Entidad extends BaseEntity { /** * Serial */ private static final long serialVersionUID = 3453805453717178734L; @Id //@GeneratedValue(strategy= GenerationType.TABLE) -- this annotations enables automatic generation for table ids protected Long id; protected String name; protected String image; protected String notes; @OrderBy("id") @OneToMany(mappedBy = "entity") protected Set<EntityHeader> headersType = new HashSet<EntityHeader>(); //Getters and setters }

@Entity @Table(name = "header_type") public class HeaderType extends AbstractBasicEntity { /** * Serial */ private static final long serialVersionUID = -7471230510640592406L; @Id //@GeneratedValue(strategy= GenerationType.TABLE) -- this annotations enables automatic generation for table ids protected Long id; private String name; @OrderBy("id") @OneToMany(mappedBy = "headerType") private Set<EntityHeader> entities = new HashSet<EntityHeader>(); //Getters and setters }

@Entity @Table(name = "entity_header") public class EntityHeader implements Serializable{ /** * Serial */ private static final long serialVersionUID = 1710372870796468955L; @Id private Long id; @ManyToOne @JoinColumn private Entidad entity; @ManyToOne @JoinColumn private HeaderType headerType; private String value; //Getters and setters }
这个解决方案需要改进，但我希望它能帮助您走上正确的道路

PS：如果我犯了任何英文错误，很抱歉。
多个Id字段意味着您需要定义一个IdClass。实际上，HeaderType和Entidad都有一个Id，该字段位于BaseEntity@Kratul我曾经想象过这样的事情，但我只是想确定id是否存在于每个相关实体中