Hibernate 学习札记（二）——关系映射

2012-10-25

Hibernate 学习笔记（二）——关系映射一、涉及的两张表。1、员工表（序号、员工编号、姓名、密码、部门）?????????????

Hibernate 学习笔记（二）——关系映射

一、涉及的两张表。

1、员工表（序号、员工编号、姓名、密码、部门）??????????????

???????????????????????????? ??? tbl_employee（nativeId,employeeId,employeeName,password,department）

2、部门表（序号、部门编号、部门名、部门信息、部门成员）

????????????????????????????? tbl_department（nativeId,departmentId,departmentName,departmentinfo,employeeList）

注：序号标识唯一性，这里采用native生成方式。

二、基本类。

1、Employee.java

public class Employee {  private int nativeId; private String employeeId; private String employeeName; private String password; private Department department;   getters and setters...}

2、Department.java

public class Department { private int nativeId; private String departmentId; private String departmentName; private String departmentinfo; private Set<Employee>employeeList;     getters and setters...}

?注：private Set<Employee>employeeList;采用了Set 而非ArrayList。

三、Hibernate的映射配置(*.hbm.xml)。?

为看得清楚，将其配置文件分开。

1、Employee.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 package="wuyechun.studymvc.model"> <class name="Employee" table="tbl_employee">         <id name="nativeId">                <generator column="departmentId" cascade="save-update"></many-to-one>  </class></hibernate-mapping>

?2、Department.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 package="wuyechun.studymvc.model"> <class name="Department" table="tbl_department">          <id name="nativeId">                <generator >              <key column="departmentId"></key>              <one-to-many src="/img/2012/10/16/1827139943.png" width="540" height="62">
?
2、tbl_department
?
注：只有tbl_employee表中含有 departmentId 字段标示两张表的映射关系。
?
ps:仅作记录，方便自己翻阅。如果对你有所帮助，不甚荣幸。

热点排行

Web前端

Hibernate 学习札记（二）——关系映射