提问者:小点点

带有复合主键的JPA@OneToMore


我需要用JPA映射以下我无法更改的遗留DB表结构。表ao_rda_acq(1)之间是一对多关系-

表(1)

create table ao_rda_acq
(
    id_divisione     varchar(4)  not null,
    esercizio        smallint    not null,
    id_rda           varchar(10) not null,
    ...
    other fields
    ...
    constraint pk_ao_rda_acq
        primary key (id_divisione, esercizio, id_rda)   
)   

表多

create table ao_rda_acq_righe
(
    id_divisione     varchar(4) ,
    esercizio        smallint    not null,
    id_rda           varchar(10) not null,
    nr_riga          integer     not null,
    ...
    other fields
    ... 
    constraint pk_ao_rda_righe
        primary key (id_divisione, esercizio, id_rda, nr_riga),
    constraint ao_rda_acq_righe_ao_rda_acq_id_divisione_esercizio_id_rda_fk
        foreign key (id_divisione, esercizio, id_rda) references ao_rda_acq     
)

表ao_rda_acq的主键在关系的一侧有三个字段id_divisione、esercizio和id_rda。表侧的主键-许多关系具有相同的3个字段加上第4个字段nr_riga。

我使用复合主键的@IdClass注释尝试了这种JPA方法

@Table(name="ao_rda_acq")
@Entity
@IdClass(RdaId.class)
@JsonIgnoreProperties(ignoreUnknown = true)
public class Rda {

    @Id
    public String idDivisione;
    @Id
    public Integer esercizio;
    @Id
    public String idRda;
    
    @OneToMany(
            cascade = CascadeType.ALL,
            orphanRemoval = true
    )
    @JoinColumns({
        @JoinColumn(name="id_divisione", referencedColumnName = "id_divisione"),
        @JoinColumn(name="esercizio", referencedColumnName = "esercizio"),
        @JoinColumn(name="id_rda", referencedColumnName = "id_rda")
    })
    @OrderBy("nrRiga")
    public List<RdaRiga> righe = new ArrayList<>();     

    //Additional fields
}

在哪里

public class RdaId implements Serializable {
    String idDivisione;
    Integer esercizio;
    String idRda;
}

行的实体是

@Entity
@JsonIgnoreProperties(ignoreUnknown = true)
@IdClass(RdaRigaId.class)
@Table(name = "ao_rda_acq_righe")
public class RdaRiga {

    @Id
    public String idDivisione;
    @Id
    public Integer esercizio;
    @Id
    public String idRda;
    @Id
    public Long nrRiga; 
    
    //More fields
}

在哪里

public class RdaRigaId implements Serializable {
    String idDivisione;
    Integer esercizio;
    String idRda;
    Long nrRiga;
}

此代码编译,但启动时的JPA会抱怨此消息

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Invocation of init method failed; nested exception is org.hibernate.DuplicateMappingException: Table [ao_rda_acq_righe] contains physical column name [id_divisione] referred to by multiple logical column names: [id_divisione], [idDivisione]

这是映射我不满意的数据库结构的最佳方法吗?如果是的话,我错过了什么?


共1个答案

匿名用户

如果使用不带@Column注释的@Id,则假定列的名称为已注释属性的名称。考虑到您的DB列似乎是*id_divisione*,您还需要使用注释@column(name=“id_division”)

这也适用于用@Id注释的其他属性。