hibernate中的复合主键的映射

复合主键映射

使用<composite-id>节点来映射：

Ø 持久化类User:

package pojo; import java.io.Serializable; public class User implements Serializable { private static final long serialVersionUID = 1L; private String firstName; private String lastName; private int age; public String getFirstName() { return firstName; } public void setFirstName(String firstName) { this.firstName = firstName; } public String getLastName() { return lastName; } public void setLastName(String lastName) { this.lastName = lastName; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } }

Ø 映射配置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="pojo.User" table="T_User"> <!-- 配置复合主键 --> <composite-id> <key-property name="firstName" column="firstName" length="50" type="java.lang.String" /> <key-property name="lastName" column="lastName" length="50" type="java.lang.String" /> </composite-id> <property name="age" column="age" type="java.lang.Integer" /> </class> </hibernate-mapping>

Ø 基于主键类的复合主键

持久化类:Users2.java

package pojo; import java.io.Serializable; public class User2 implements Serializable { private UserPk userpk; public UserPk getUserpk() { return userpk; } public void setUserpk(UserPk userpk) { this.userpk = userpk; } public int getAge() { return age; } @Override public boolean equals(Object obj) { // TODO Auto-generated method stub return super.equals(obj); } @Override public int hashCode() { // TODO Auto-generated method stub return super.hashCode(); } public void setAge(int age) { this.age = age; } private int age; }

主键类UserPk.java

package pojo; import java.io.Serializable; public class UserPk implements Serializable { private String firstName; private String lastName; public String getFirstName() { return firstName; } @Override public boolean equals(Object obj) { // TODO Auto-generated method stub return super.equals(obj); } @Override public int hashCode() { // TODO Auto-generated method stub return super.hashCode(); } public void setFirstName(String firstName) { this.firstName = firstName; } public String getLastName() { return lastName; } public void setLastName(String lastName) { this.lastName = lastName; } }

映射文件:User2.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="pojo.User2" table="T_User2"> <!-- 配置复合主键 --> <composite-id name="userpk" class="pojo.UserPk"> <key-property name="firstName" column="firstName" length="50" type="java.lang.String" /> <key-property name="lastName" column="lastName" length="50" type="java.lang.String" /> </composite-id> <property name="age" column="age" type="java.lang.Integer" /> </class> </hibernate-mapping>