hibernate 映射继承关系

实现方式一般有三种： 1. 继承关系树每个具体类对应一张表（不介绍） 2. 继承关系树的根类对应一张表 3. 继承关系树的每个类对应一张表 先介绍关系： DayEmployee和MonthEmploy是Employee的子类，并且Company和Employee是一对多关系： 具体代码如下： Compan

实现方式一般有三种：
1. 继承关系树每个具体类对应一张表（不介绍）
2. 继承关系树的根类对应一张表
3. 继承关系树的每个类对应一张表

先介绍关系：
DayEmployee和MonthEmploy是Employee的子类，并且Company和Employee是一对多关系：

具体代码如下：

Company.java

import java.util.HashSet;
import java.util.Set;

public class Company {
    private Integer id;
    private String name;
    private Set employees = new HashSet();

    public Company() {
        super();
    }
    public Company(String name) {
        super();
        this.name = name;
    }
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public SetgetEmployees() {
        return employees;
    }
    public void setEmployees(Set employees) {
        this.employees = employees;
    }
}

Employee.java

    public class Employee {
    private Integer id;
    private String name;
    private Integer age;
    private Company company;
    public Company getCompany() {
        return company;
    }
    public void setCompany(Company company) {
        this.company = company;
    }
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Integer getAge() {
        return age;
    }
    public void setAge(Integer age) {
        this.age = age;
    }

}

DayEmployee.java

public class DayEmployee extends Employee{
    private Double dayMoney;

    public Double getDayMoney() {
        return dayMoney;
    }
    public void setDayMoney(Double dayMoney) {
        this.dayMoney = dayMoney;
    }

}

MonthEmploy.java

    public class MonthEmploy extends Employee{
    private Double monthMoney;

    public Double getMonthMoney() {
        return monthMoney;
    }
    public void setMonthMoney(Double monthMoney) {
        this.monthMoney = monthMoney;
    }

}

Company.hbm.xml

hibernate-mapping package="com.dongecs.test1.pojo">
    class name="Company" table="COMPANY">