我有2个表employee和employee_document。这是两个表的mysql查询 -
CREATE TABLE employee (
id int(11) unsigned NOT NULL,
name varchar(100) COLLATE utf8_unicode_ci NOT NULL,
email varchar(50) COLLATE utf8_unicode_ci NOT NULL,
password_hash varchar(100) COLLATE utf8_unicode_ci NOT NULL,
status int(11) NOT NULL,
creation_date bigint(20) NOT NULL,
created_by int(11) DEFAULT NULL,
update_date bigint(20) NOT NULL,
updated_by int(11) DEFAULT NULL,
PRIMARY KEY (id),
UNIQUE KEY email (email)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
CREATE TABLE employee_document (
id int(11) unsigned NOT NULL AUTO_INCREMENT,
employee_id int(11) unsigned NOT NULL,
file_id int(11) unsigned NOT NULL,
document_type varchar(50) COLLATE utf8_unicode_ci DEFAULT '',
status int(11) DEFAULT NULL,
creation_date bigint(20) DEFAULT NULL,
created_by int(11) unsigned NOT NULL,
update_date bigint(20) DEFAULT NULL,
updated_by int(11) unsigned NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
在我的春季启动项目中，我将hibernate与JPA Data一起使用。以下是这些表的java解释。
@MappedSuperclass
public abstract class AbstractTimestampEntity {
@Transient
Logger log = LoggerFactory.getLogger(AbstractTimestampEntity.class);
@Column(name = "creation_date", nullable = false, updatable=false)
private Long creationDate;
@Column(name = "update_date", nullable = false)
private Long updateDate;
@PrePersist
protected void onCreate() {
log.debug("onCreate");
updateDate = creationDate = System.currentTimeMillis();
}
@PreUpdate
protected void onUpdate() {
log.debug("onUpdate");
updateDate = System.currentTimeMillis();
}
}
@Entity
@Table(name = "employee")
public class Employee extends AbstractTimestampEntity implements Serializable {
private static final long serialVersionUID = 1L;
public static final Integer STATUS_INACTIVE = 0;
public static final Integer STATUS_ACTIVE = 1;
public static final Integer STATUS_ARCHIVED = -1;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id")
public Integer id;
@Column(name = "name", nullable = false)
public String name;
@Email
@Column(name = "email", nullable = false, unique = true)
public String email;
@JsonIgnore
@Column(name = "password_hash", nullable = false)
public String passwordHash;
@OneToMany(cascade = CascadeType.ALL, mappedBy = "employee", fetch = FetchType.EAGER)
private Set<EmployeeDocument> documents;
@Max(1)
@Min(-1)
@Column(name = "status", nullable = false )
public Integer status;
@Column(name = "created_by", updatable = false)
public Integer createdById;
@Column(name = "updated_by")
public Integer updatedById;
}
@Entity
@Table(name = "employee_document")
public class EmployeeDocument extends AbstractTimestampEntity implements Serializable {
private static final long serialVersionUID = 1L;
@Transient
public static final Integer STATUS_INACTIVE = 0;
@Transient
public static final Integer STATUS_ACTIVE = 1;
@Transient
public static final Integer STATUS_ARCHIVED = -1;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id")
public Integer id;
@JsonIgnore
@ManyToOne
@JoinColumn(name = "employee_id", nullable = false)
public Employee employee;
@OneToOne
@JoinColumn(name = "file_id")
public EmployeeFile employeeFile;
@Max(1)
@Min(-1)
@Column(name = "status", nullable = false )
public Integer status;
@ManyToOne(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
@JoinColumn(name = "created_by", updatable = false)
@JsonBackReference
public Employee createdBy;
@ManyToOne(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
@JoinColumn(name = "updated_by")
@JsonBackReference
public Employee updatedBy;
}
此代码未执行，应用无法启动并抛出DuplicateMappingException。这是完整的异常堆栈 -
org.hibernate.DuplicateMappingException: Table [employee_document] contains physical column name [created_by] referred to by multiple physical column names: [createdBy], [created_by]
at org.hibernate.boot.internal.InFlightMetadataCollectorImpl$TableColumnNameBinding.bindPhysicalToLogical(InFlightMetadataCollectorImpl.java:922)
at org.hibernate.boot.internal.InFlightMetadataCollectorImpl$TableColumnNameBinding.addBinding(InFlightMetadataCollectorImpl.java:891)
at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.addColumnNameBinding(InFlightMetadataCollectorImpl.java:961)
at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.addColumnNameBinding(InFlightMetadataCollectorImpl.java:942)
at org.hibernate.cfg.Ejb3Column.addColumnBinding(Ejb3Column.java:407)
at org.hibernate.cfg.Ejb3Column.linkWithValue(Ejb3Column.java:369)
at org.hibernate.cfg.annotations.SimpleValueBinder.linkWithValue(SimpleValueBinder.java:431)
at org.hibernate.cfg.annotations.SimpleValueBinder.make(SimpleValueBinder.java:407)
at org.hibernate.cfg.annotations.PropertyBinder.makePropertyAndValue(PropertyBinder.java:187)
at org.hibernate.cfg.annotations.PropertyBinder.makePropertyValueAndBind(PropertyBinder.java:199)
at org.hibernate.cfg.AnnotationBinder.processElementAnnotations(AnnotationBinder.java:2225)
at org.hibernate.cfg.AnnotationBinder.processIdPropertiesIfNotAlready(AnnotationBinder.java:911)
at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:738)
at org.hibernate.boot.model.source.internal.annotations.AnnotationMetadataSourceProcessorImpl.processEntityHierarchies(AnnotationMetadataSourceProcessorImpl.java:245)
at org.hibernate.boot.model.process.spi.MetadataBuildingProcess$1.processEntityHierarchies(MetadataBuildingProcess.java:222)
at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:265)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:847)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:874)
at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:60)
at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:353)
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:373)
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:362)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1687)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1624)
... 19 common frames omitted
我做错了什么？提前谢谢。
答案 0 :(得分：0)
您尝试从EmployeeDocument引用Empolyee三次，但只有一个是主键。其他两个由非主键列引用，您还需要使用referencedColumnName选项才能使其工作：
@JsonIgnore
@ManyToOne
@JoinColumn(name = "employee_id", nullable = false)
public Employee employee;
@ManyToOne(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
@JoinColumn(name = "created_by", referencedColumnName="created_by", updatable = false)
@JsonBackReference
public Employee createdBy;
@ManyToOne(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
@JoinColumn(name = "updated_by". , referencedColumnName="updated_by")
@JsonBackReference
public Employee updatedBy;