Hibernate实体映射

最新推荐文章于 2025-08-20 20:08:44 发布

原创最新推荐文章于 2025-08-20 20:08:44 发布 · 382 阅读

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文章标签：

#hibernate #bean #uml #数据库 #email

本文通过商品系统案例，解析了一对多及多对多的关联关系，并详细展示了Hibernate实体映射配置。

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首先要知道类之间的关系有五种：继承、依赖、关联、聚合、组合.在UML绘制图的过程中我们也要使用这五种关系图类之间的关系有五种：继承、依赖、关联、聚合、组合.在UML绘制图的过程中我们也要使用这五种关系图。在这我们只说关联关系。

关联 Association 关联指的是类之间的引用关系。这是实体域对象之间最普遍使用最广泛的一种关系。关联可分为一对一、一对多和多对多关联。在Hibernate实体映射中我们可以把所有关联关系都看成一对多的关联。

下面我用个例子说明：

商品案例数据库设计：

客户表

id ：递增序列

name ：登录名称

pass ：登录密码

sex ：性别 //enum

email : 注册邮箱

rdate : 注册日期 //BeanUtils

state :是否被激活的状态 0 1

商品表

id ：递增序列

name : 商品的名称

type : 商品的类型

price : 商品的价格

管理员表：

name

pass

订单表：

number ：订单编号

customerid：客户名称

odate：订单时间

state ：订单的状态 //已发货未发货 0 1

Qstate ：确认订单是否订购 0 1

订单明细表

goodid：商品的名称

num ：商品数量

total ：商品的总价格

ordersid ：订单

从以上数据库设计我们可以看出客户表与订单表是一对多的关联关系，商品表和订单表是多对多的关联关系，而我们在商品表和订单表中间加入一个订单明细表，使商品表和订单明细表成为一对多的关联关系，订单表和订单明细表成为一对多的关联关联。

下面我用具体事例来说明。

Admin的bean：

public class Admin implements Serializable{

private static final long serialVersionUID = 1L;

private int id;

private String name;

private String pass;

public Admin(){}

public Admin(String name,String pass){

this.name=name;

this.pass=pass;

}

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;

}

public String getPass() {

return pass;

}

public void setPass(String pass) {

this.pass = pass;

}

Admin.hbm.xml：

<hibernate-mapping>

</id>

</class>

</hibernate-mapping>

Customer的bean：

public class Customer implements Serializable {

/**

private static final long serialVersionUID = 1L;

private int id;

private String name;

private String pass;

private Sex sex;

private String email;

private Date rdate;

private int state;

private Set<Orders> orders = new HashSet<Orders>();

public Customer(String name, String pass, Sex sex, String email,

Date rdate, int state, Set<Orders> orders) {

this.name = name;

this.pass = pass;

this.sex = sex;

this.email = email;

this.rdate = rdate;

this.state = state;

this.orders = orders;

}

public Customer() {

}

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;

}

public String getPass() {

return pass;

}

public void setPass(String pass) {

this.pass = pass;

}

public Sex getSex() {

return sex;

}

public void setSex(Sex sex) {

this.sex = sex;

}

public String getEmail() {

return email;

}

public void setEmail(String email) {

this.email = email;

}

public Date getRdate() {

return rdate;

}

public void setRdate(Date rdate) {

this.rdate = rdate;

}

public int getState() {

return state;

}

public void setState(int state) {

this.state = state;

}

public Set<Orders> getOrders() {

return orders;

}

public void setOrders(Set<Orders> orders) {

this.orders = orders;

}

Customer.hbm.xml：

</id>

<one-to-many class="cn.csdn.domain.Orders" />

</set>

</class>

Goods 的bean：

public class Goods implements Serializable{

private int id;

private String name;

private String type;

private double price;

private Set<OrdersItem> ordersItem = new HashSet<OrdersItem>();

public Goods() {

}

public Goods(String name, String type, double price,

Set<OrdersItem> ordersItem) {

this.name = name;

this.type = type;

this.price = price;

this.ordersItem = ordersItem;

}

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;

}

public String getType() {

return type;

}

public void setType(String type) {

this.type = type;

}

public double getPrice() {

return price;

}

public void setPrice(double price) {

this.price = price;

}

public Set<OrdersItem> getOrdersItem() {

return ordersItem;

}

public void setOrdersItem(Set<OrdersItem> ordersItem) {

this.ordersItem = ordersItem;

}

Goods.hbm.xml：

</id>

<one-to-many class="cn.csdn.domain.OrdersItem"/>

</set>

</class>

Orders的bean

public class Orders implements Serializable{

/**

private static final long serialVersionUID = 1L;

private int id;

private String number;

private Customer customer;

private Date odate;

private int state;

private int Qstate;

private Set<OrdersItem> ordersItem = new HashSet<OrdersItem>();

public Orders() {

}

public Orders(int id, String number, Customer customer, Date odate,

int state, int qstate, Set<OrdersItem> ordersItem) {

super();

this.id = id;

this.number = number;

this.customer = customer;

this.odate = odate;

this.state = state;

Qstate = qstate;

this.ordersItem = ordersItem;

}

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

public String getNumber() {

return number;

}

public void setNumber(String number) {

this.number = number;

}

public Customer getCustomer() {

return customer;

}

public void setCustomer(Customer customer) {

this.customer = customer;

}

public Date getOdate() {

return odate;

}

public void setOdate(Date odate) {

this.odate = odate;

}

public int getState() {

return state;

}

public void setState(int state) {

this.state = state;

}

public int getQstate() {

return Qstate;

}

public void setQstate(int qstate) {

Qstate = qstate;

}

public Set<OrdersItem> getOrdersItem() {

return ordersItem;

}

public void setOrdersItem(Set<OrdersItem> ordersItem) {

this.ordersItem = ordersItem;

}

Orders.hbm.xml：

<hibernate-mapping>

</id>

<many-to-one name="customer" class="cn.csdn.domain.Customer" column="cid"/>

<one-to-many class="cn.csdn.domain.OrdersItem"/>

</set>

</class>

</hibernate-mapping>

OrdersItem的bean

public class OrdersItem {

private int id;

private Goods goods;

private int num;

private double total;

private Orders orders;

public OrdersItem() {

}

public OrdersItem(Goods goods, int num, double total, Orders orders) {

super();

this.goods = goods;

this.num = num;

this.total = total;

this.orders = orders;

}

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

public Goods getGoods() {

return goods;

}

public void setGoods(Goods goods) {

this.goods = goods;

}

public int getNum() {

return num;

}

public void setNum(int num) {

this.num = num;

}

public double getTotal() {

return total;

}

public void setTotal(double total) {

this.total = total;

}

public Orders getOrders() {

return orders;

}

public void setOrders(Orders orders) {

this.orders = orders;

}

OrdersItem.hbm.xml：

<hibernate-mapping>

<class name="cn.csdn.domain.OrdersItem" table="ordersItems"

catalog="db">

</id>

<many-to-one name="goods" class="cn.csdn.domain.Goods"

column="gid" />

<many-to-one name="orders" class="cn.csdn.domain.Orders"

column="oid" />

</class>

</hibernate-mapping>