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?
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。