JPA 双向一对多关联实例
一对多关系分两种,单向和双向.首先,先看看单向一对多的例子,比如Company和Employee的关系就是典型的一对多关系:
private Company company; @ManyToOne @JoinColumn(name="company_id") public Company getCompany() { return company; } public void setCompany(Company company) { this.company = company; }