java如何使用@ManyToMany审核@JoinTable
我正在做一个带有H2数据库的Spring启动项目。我有两个实体Portfolio
和Report
,这两个实体之间存在多对多的关联。
我希望对这些实体进行审计,因此我跟随this tutorial通过带有自定义字段的AuditorAware
接口进行审计
对这两个实体进行了良好的审核,并在数据库中创建了列。但是,联接表portfolio_reports
未经审核。如何审核联接表呢
投资组合。java
@Entity
@Table(name = "portfolio")
public class Portfolio extends Auditable<String> implements Serializable {
@Id
@Column(name = "id")
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@Column(name = "name")
@Unique
private String name;
@ManyToMany(fetch = FetchType.LAZY, cascade = CascadeType.PERSIST)
@JoinTable(name = "portfolio_report", joinColumns = @JoinColumn(name = "portfolio_id"), inverseJoinColumns = @JoinColumn(name = "report_id"))
private List<Report> reports;
// Getters and setters
}
报告。java
@Entity
@Table(name = "report")
public class Report extends Auditable<String> implements Serializable {
@Id
@Column(name = "id")
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@Column(name = "axioma_id")
private Long axiomaId;
@Column(name = "name")
private String name;
@AuditJoinTable
@ManyToMany(mappedBy = "reports", cascade = CascadeType.PERSIST, fetch = FetchType.LAZY)
private List<Portfolio> portfolios;
// Getters and setters
}
可审核。java
@MappedSuperclass
@EntityListeners(AuditingEntityListener.class)
public abstract class Auditable<U> {
@Version
@Column(name = "version_no")
protected Long versionNo;
@CreatedDate
@Temporal(TemporalType.TIMESTAMP)
@Column(name = "created_date")
protected Date createdDate;
@LastModifiedDate
@Temporal(TemporalType.TIMESTAMP)
@Column(name = "modified_date")
protected Date modifiedDate;
}
AuditorAwareImpl。java
public class AuditorAwareImpl implements AuditorAware<String> {
@Override
public Optional<String> getCurrentAuditor() {
return Optional.of("Admin");
}
}
持久性配置。java
@Configuration
@EnableJpaAuditing(auditorAwareRef = "auditorAware")
public class PersistenceConfiguration {
@Bean
public AuditorAware<String> auditorAware() {
return new AuditorAwareImpl();
}
}
# 1 楼答案
问题:
显然
Auditable
应该在中间表中添加一些列,以维护Portfolio
和Report
之间的关系,并且该表是在后台创建的,您在程序中无权访问该表。只有hibernate可以使用该表来维护实体之间的关系并执行联接操作解决方案:
在这里,您应该使保持
Portfolio
和Report
之间的多对多关系的联接表显式化,以便您的程序中可以有类似PortfolioReport
的实体,可以从Auditable
扩展。请阅读下面的帖子了解如何做到这一点:The best way to map a many-to-many association with extra columns when using JPA and Hibernate