hibernate对象关系映射的配置

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一对一主键关联单双向

<?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 package="com.wepull.pojo"><class name="IdCard" table="t_idcard"><id name="id"><generator class="native"></generator>        </id><property name="name"></property><!-- 双向配置如下 --><one-to-one name="p"></one-to-one></class>
</hibernate-mapping><hibernate-mapping package="com.wepull.pojo"><class name="Person" table="t_person"><id name="id"><generator class="foreign"><param name="property">i</param></generator>        </id><property name="name"></property><!-- person找Idcard  单向 --><one-to-one name="i" constrained="true"></one-to-one></class>
</hibernate-mapping>

一对一外键关联单双向

<?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 package="com.wepull.pojo"><class name="IdCard" table="t_idcard"><id name="id"><generator class="native"></generator>        </id><property name="name"></property><!-- 双向配置    级联删除--><one-to-one name="p" property-ref="i" cascade="delete"></one-to-one></class>
</hibernate-mapping><hibernate-mapping package="com.wepull.pojo"><class name="Person" table="t_person"><id name="id"><generator class="native"></generator>        </id><property name="name"></property><!-- person找Idcard  单向 --><many-to-one name="i" unique="true"></many-to-one></class>
</hibernate-mapping>

一对多/多对一

<?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 package="com.wepull.pojo"><class name="Student" table="t_student"><id name="id"><generator class="native"></generator>        </id><property name="name"></property><!-- 多对一配置如下 --><many-to-one name="c" class="Classes"></many-to-one></class>
</hibernate-mapping><hibernate-mapping package="com.wepull.pojo"><class name="Classes" table="t_classes"><id name="id"><generator class="native"></generator>        </id><property name="name"></property><!-- 一对多 --><set name="s" inverse="true"><!-- 由学生管理 --><!-- column:多的一方持有一的一方的外键字段 --><key column="c"></key><one-to-many class="Student" /></set></class>
</hibernate-mapping>

多对多单双向

<hibernate-mapping package="com.wepull.pojo"><class name="Role" table="t_role"><id name="id"><generator class="native"></generator>        </id><property name="name"></property><!-- 多对多 --><set name="u" table="t_user_role"><key column="r"></key><many-to-many class="User" column="u"></many-to-many></set>    </class>
</hibernate-mapping><hibernate-mapping package="com.wepull.pojo"><class name="User" table="t_user"><id name="id"><generator class="native"></generator>        </id><property name="name"></property><!-- 多对多配置如下 --><set name="r" table="t_user_role"><key column="u"></key><many-to-many class="Role" column="r"></many-to-many></set></class>
</hibernate-mapping>

Annotation注解(多对一)

import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
/*** @author fcs* 不能自动删除表* 多对一单向     多方持有一方的外键* 2014-8-24*/@Entity
public class Student {private int id;private String name;private Classes c;@ManyToOne(fetch=FetchType.LAZY)//延迟加载@JoinColumn(name="cid")//修改表字段名  防止自动生成sidpublic Classes getC() {return c;}public void setC(Classes c) {this.c = c;}@Id@GeneratedValue(strategy=GenerationType.IDENTITY)//主键自增长public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}
}