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Hibernate一对多关联双向关联代码实现分享

2019年07月22日  | 移动技术网IT编程  | 我要评论

1、创建实体类（customer.java、orders.java）

复制代码 代码如下:

package wck.stu.vo.onetomany_single;

import java.util.hashset;
import java.util.set;

public class customer {
    private string id = "";

    private string cname = "";

    private string bank = "";

    private string phone = "";

    private set orders = new hashset();

    public string getid() {
        return id;
    }

    public void setid(string id) {
        this.id = id;
    }

    public string getcname() {
        return cname;
    }

    public void setcname(string cname) {
        this.cname = cname;
    }

    public string getbank() {
        return bank;
    }

    public void setbank(string bank) {
        this.bank = bank;
    }

    public string getphone() {
        return phone;
    }

    public void setphone(string phone) {
        this.phone = phone;
    }

    public set getorders() {
        return orders;
    }

    public void setorders(set orders) {
        this.orders = orders;
    }

   
}

customer.java

复制代码 代码如下:

package wck.stu.vo.onetomany_single;

public class orders {
    private string id = "";

    private string orderno = "";

    private double money = 0.0;

    private customer customer;

    public string getid() {
        return id;
    }

    public void setid(string id) {
        this.id = id;
    }

    public string getorderno() {
        return orderno;
    }

    public void setorderno(string orderno) {
        this.orderno = orderno;
    }

    public double getmoney() {
        return money;
    }

    public void setmoney(double money) {
        this.money = money;
    }

    public customer getcustomer() {
        return customer;
    }

    public void setcustomer(customer customer) {
        this.customer = customer;
    }
}

orders.java

2、配置文件（customer.hbm.xml、orders.hbm.xml）

复制代码 代码如下:

<?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>
    <class name="wck.stu.vo.onetomany_single.customer" table="customer">
        <id name="id" type="java.lang.string">
            <column name="c_id" length="32" not-null="true"></column>
            <generator class="uuid.hex"></generator>
        </id>
        <property column="cname" name="cname" type="string" length="100"/>
        <property column="bank" name="bank" type="string" length="100"/>
        <property column="phone" name="phone" type="string" length="20"/>
        <!--一对多双向关联映射customer到orders，单的一方配置 -->
        <set cascade="all" inverse="true" lazy="false" name="orders">
            <key column="customer_id" />
            <one-to-many class="wck.stu.vo.onetomany_single.orders" />
        </set>
    </class>
</hibernate-mapping>

customer.hbm.xml

复制代码 代码如下:

<?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>
    <class name="wck.stu.vo.onetomany_single.orders" table="orders">
        <id name="id" type="java.lang.string">
            <column name="c_id" length="32" not-null="true"></column>
            <generator class="uuid.hex"></generator>
        </id>
        <property column="orderno" name="orderno" type="java.lang.string" length="17"/>
        <property column="money" name="money" type="java.lang.double" />
        <many-to-one name="customer" class="wck.stu.vo.onetomany_single.customer" column="customer_id" cascade="all" lazy="false" not-null="true"/>
    </class>
</hibernate-mapping>

orders.hbm.xml

3、测试代码

复制代码 代码如下:

public string savecustomerinfo() {
        customer customer = new customer();
        customer.setcname("清华大学出版社");
        customer.setbank("9559501012356789");
        customer.setphone("010-62772015");   
        orders order = new orders();
        order.setorderno(new long(system.currenttimemillis()).tostring());
        order.setmoney(new double(rnd.nextdouble()*10000));
        order.setcustomer(customer);
        customer.getorders().add(order);
        onetomanydao.savecustormerinfo(customer);
        return customer.getid();
    }

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