【原创】Hibernateonetomany

最新推荐文章于 2023-01-06 13:58:41 发布

Kipen

最新推荐文章于 2023-01-06 13:58:41 发布

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分类专栏： Hibernate 文章标签： myeclipse integer constructor hibernate string class

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数据库两个表order,customer

     create table `test`.`customer`(
        `cid` int not null auto_increment comment 'auto_increment',
       `cname` varchar(20),
        primary key (`cid`)
    );

create unique index `PRIMARY` on `test`.`customer`(`cid`);

    create table `test`.`order`(
        `oid` int not null auto_increment comment 'auto_increment',
       `odis` varchar(500),
       `cid` int,
        primary key (`oid`)
    );

create unique index `PRIMARY` on `test`.`order`(`oid`);

index.jsp

<body>
<a href="servlet/addOrders">add orders</a>
</body>

addOrders.java

public void doGet(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  Customer customer=new Customer();
  customer.setCname("rockie");
  CDAO cdao=new CDAO();
  cdao.save(customer);
  Order order1=new Order();
  Order order2=new Order();
  Order order3=new Order();
  order1.setCustomer(customer);
  order2.setCustomer(customer);
  order3.setCustomer(customer);
  order1.setOdis("aaaa");
  order2.setOdis("bbbb");
  order3.setOdis("cccc");
  ODAO odao=new ODAO();
  odao.save(order1);
  odao.save(order2);
  odao.save(order3);
}

Customer.java

package org.rockie;

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

/**
* Customer generated by MyEclipse - Hibernate Tools
*/

public class Customer implements java.io.Serializable {

// Fields

     private Integer cid;
     private String cname;
     private Set orders=new HashSet();

// Constructors

public Set getOrders() {
return orders;
}

public void setOrders(Set orders) {
this.orders = orders;
}

/** default constructor */
public Customer() {
}

    /** full constructor */
    public Customer(String cname) {
        this.cname = cname;
    }

// Property accessors

    public Integer getCid() {
        return this.cid;
    }

    public void setCid(Integer cid) {
        this.cid = cid;
    }

    public String getCname() {
        return this.cname;
    }

    public void setCname(String cname) {
        this.cname = cname;
    }
  }

Order.java

package org.rockie;

/**
* Order generated by MyEclipse - Hibernate Tools
*/

public class Order implements java.io.Serializable {

// Fields

     private Integer oid;
     private String odis;
     private Customer customer;

// Constructors

public Customer getCustomer() {
return customer;
}

public void setCustomer(Customer customer) {
this.customer = customer;
}

/** default constructor */
public Order() {
}

    /** full constructor */
    public Order(String odis, Integer cid) {
        this.odis = odis;
    }

// Property accessors

    public Integer getOid() {
        return this.oid;
    }

    public void setOid(Integer oid) {
        this.oid = oid;
    }

    public String getOdis() {
        return this.odis;
    }

    public void setOdis(String odis) {
        this.odis = odis;
    }
}

Order.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="org.rockie.Order" table="order" catalog="test">
        <id name="oid" type="java.lang.Integer">
            <column name="oid" />
            <generator class="native" />
        </id>
        <property name="odis" type="java.lang.String">
            <column name="odis" length="500" />
        </property>
        <many-to-one name="customer" class="org.rockie.Customer" column="cid"></many-to-one>
    </class>
</hibernate-mapping>

Customer.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="org.rockie.Customer" table="customer" catalog="test">
        <id name="cid" type="java.lang.Integer">
            <column name="cid" />
            <generator class="native" />
        </id>
        <property name="cname" type="java.lang.String">
            <column name="cname" length="20" />
        </property>
  <set name="orders" cascade="all" table="order" inverse="true">
   <key column="cid"></key>
   <one-to-many class="org.rockie.Order"/>
  </set>
    </class>
</hibernate-mapping>

CDAO.java

package org.rockie;

import org.hibernate.Session;
import org.hibernate.Transaction;

public class CDAO {
public void save(Customer customer)
{
  Session session=HibernateSessionFactory.getSession();
  Transaction tx=session.beginTransaction();
   session.save(customer);
  tx.commit();
}

}

ODAO.java

package org.rockie;

import org.hibernate.Session;
import org.hibernate.Transaction;

public class ODAO {
public void save(Order order)
{
  Session session=HibernateSessionFactory.getSession();
  Transaction tx=session.beginTransaction();
   session.save(order);
  tx.commit();
}

}