Hibernate 一对一主键双向关联

2019-11-10 20:24:33

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Hibernate 一对一主键双向关联一对一主键映射在一对一映射中还算是最为常用的。一、模型一个人Person 对应一个地址Address。二、数据模型和对象模型图

导出建表SQL如下： /*==============================================================*//* DBMS name: MySQL 5.0 *//* Created on: 2008-12-8 23:05:32 *//*==============================================================*/drop table if exists address; drop table if exists person; /*==============================================================*//* Table: address *//*==============================================================*/create table address( id bigintnot null comment'ID', detail varchar(120)not null comment'详细地址', PRimary key (id)) type = InnoDB; alter table address comment'地址'; /*==============================================================*//* Table: person *//*==============================================================*/create table person( id bigintnot null auto_increment comment'ID', name varchar(24) not null comment '姓名', primary key (id)) type = InnoDB; alter table person comment'人'; alter table addressadd constraint FK_Reference_2foreign key (id) references person (id) on delete restricton update restrict; 三、对象模型代码 public class Personimplements java.io.Serializable { private Long id; private String name; private Address address; public class Addressimplements java.io.Serializable { private Long id; private Person person; private String detail; 四、映射代码<?xml version="1.0" encoding="utf-8"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <hibernate-mapping> <class name="entity.Person" table="person"> <id name="id" type="java.lang.Long"> <columnname="id" /> <generatorclass="identity"/> </id> <propertyname="name"type="java.lang.String"> <columnname="name"length="24"not-null="true"> <comment>姓名</comment> </column> </property>  <one-to-onename="address"cascade="all"/> </class></hibernate-mapping> <?xml version="1.0" encoding="utf-8"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <hibernate-mapping> <class name="entity.Address" table="address" catalog="mydb"> <id name="id" type="java.lang.Long"> <columnname="id" />  <generatorclass="foreign"> <paramname="property">person</param> </generator> </id> <propertyname="detail"type="java.lang.String"> <columnname="detail"length="120"not-null="true"> <comment>详细地址</comment> </column> </property>  <one-to-onename="person"constrained="true"/> </class></hibernate-mapping> 五、Hibernate配置<?xml version='1.0' encoding='UTF-8'?><!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> <hibernate-configuration><session-factory> <propertyname="connection.username">root</property> <propertyname="connection.url"> jdbc:mysql://localhost:3306/mydb </property> <propertyname="dialect"> org.hibernate.dialect.MySQLDialect </property> <propertyname="connection.passWord">xiaohui</property> <propertyname="connection.driver_class"> com.mysql.jdbc.Driver </property> <propertyname="show_sql">true</property> <propertyname="format_sql">true</property> <mapping resource="entity/Person.hbm.xml" /> <mapping resource="entity/Address.hbm.xml" /> </session-factory></hibernate-configuration>

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