知识大全 JPA和hibernate对删除操作的不同[4]

Posted 2022-07-18 操作

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public Integer getId() return id;

public void setId(Integer id) this id = id;

@Override public int hashCode() int hash = ; hash += (id != null ? id hashCode() : ); return hash;

@Override public boolean equals(Object object) // TODO: Warning this method won t work in the case the id fields are not set if (!(object instanceof Person)) return false; Person other = (Person) object; if ((this id == null && other id != null) || (this id != null && !this id equals(other id))) return false; return true;

@Override public String toString() return hadeslee jpaentity Person[id= + id + ] ;

　　由于JPA是不需要配置的代码里面已经包括了注释所以下面附上Hibernate的映射文件为了使数据库里面更清楚一些所以两者使用的表不是同一张表 JPA的表是带JPA前缀的用@Table这个注释声明了这一点

<?xml version= encoding= UTF ?>

<!DOCTYPE hibernate mapping PUBLIC //Hibernate/Hibernate Mapping DTD //EN //hibernate sourcefe net/hibernate mapping dtd ><hibernate mapping package= hadeslee jpaentity > <class name= Department table= Department > <id name= id column= departId type= long > <generator class= native /> </id> <property name= deptName /> <property name= description /> <set name= persons > <key column= deptId /> <one to many class= Person /> </set> </class> <class name= Person table= Person > <id name= id column= personId type= long > <generator class= native /> </id> <property name= name /> <property name= age /> <many to one name= department column= deptId class= Department /> </class></hibernate mapping>

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