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Hibernate- 表联系
hibernate.cfg.xml 配置文件：连接数据库
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"><hibernate-configuration> <session-factory> <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property> <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernate_many2one</property> <property name="hibernate.connection.username">root</property> <property name="hibernate.connection.password">bjpowernode</property> <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property> <property name="hibernate.show_sql">true</property> <!-- 数据库表--> <mapping resource="com/bjpowernode/hibernate/User.hbm.xml"/> <mapping resource="com/bjpowernode/hibernate/Group.hbm.xml"/> </session-factory></hibernate-configuration>
many-t-one
Group.hbm.xml
<?xml version="1.0"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><hibernate-mapping> <class name="com.bjpowernode.hibernate.Group" table="t_group"> <id name="id"> <generator class="native"/> </id> <property name="name"/> </class></hibernate-mapping>
User.hbm.xml
<?xml version="1.0"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><hibernate-mapping> <class name="com.bjpowernode.hibernate.User" table="t_user"> <id name="id"> <generator class="native"/> </id> <property name="name"/> <many-to-one name="group" column="groupid" cascade="save-update"/> </class></hibernate-mapping>
one-to-one
IdCard.hbm.xml
<?xml version="1.0"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><hibernate-mapping> <class name="com.bjpowernode.hibernate.IdCard" table="t_idCard"> <id name="id"> <generator class="native"/> </id> <property name="cardNo"/> </class></hibernate-mapping>
Person.hbm.xml
<?xml version="1.0"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><hibernate-mapping> <class name="com.bjpowernode.hibernate.Person" table="t_person"> <id name="id"> <!-- 采用foreign生成策略，foreign会取得关联对象的标示 --> <generator class="foreign"> <!-- property 指关联对象 --> <param name="property">idCard</param> </generator> </id> <property name="name"/> <!-- one-to-one 指示hibernate如何加载其关联对象，默认根据主键加载， 也就是拿到关联字段值，根据对端的主键来加载关联对象 constrained="true"表示，当前主键（person的主键）还是一个外键 参照了对端的主键（IdCard的主键），也就是会生成外键约束语句 --> <one-to-one name="idCard" constrained="true"/> </class></hibernate-mapping>
Hibernate- 表联系
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