Question

如何在2个 many-to-many 和 Person 类之间建立Address关系？以下是Person和Address的 POJO 。

人：

public class Person {
    private int personID;
    private String name;
    private Person person;
    private List addressList;

    public List getAddressList() {
        return addressList;
    }

    public void setAddressList(List addressList) {
        this.addressList = addressList;
    }

    public int getPersonID() {
        return personID;
    }

    public void setPersonID(int personID) {
        this.personID = personID;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Person getPerson() {
        return person;
    }

    public void setPerson(Person person) {
        this.person = person;
    }

}

地址：

public class Address {
    private int addressID;
    private String address;
    private Person person;

    public int getAddressID() {
        return addressID;
    }

    public void setAddressID(int addressID) {
        this.addressID = addressID;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public Person getPerson() {
        return person;
    }

    public void setPerson(Person person) {
        this.person = person;
    }

}

我想要定义的关系是A person can have many addresses and one address can belong to many people。我无法在mapping xml中表示这一点。这是我迄今为止所能做的。

    <hibernate-mapping>
      <class name="pojo.Person" table="person">
          <id name="personID" column="p_id">
              <generator class="increment" />
          </id>
          <property name="name" column="p_name" />
          <list name="addressList" table="address">
              <key column="a_id" />
              <!-- DEFINE MANY TO MANY --!>
          </list> 
      </class>

      <class name="pojo.Address" table="address">
          <id name="addressID" column="a_id">
              <generator class="" />
          </id>
          <property name="address" />
      </class>
    </hibernate-mapping>

如何定义这两个类之间的many to many关系？

Answer 1

在private List persons课程中添加private Person person而不是Address。

像这样配置您的mapping.xml

//For person.hbm.xml
<list name="addresses" inverse="false" table="person_address">
    <key>
        <column name="Person_ID" not-null="true" />
    </key>
    <many-to-many entity-name="domains.Address">
            <column name="listAddress_ID" not-null="true" />
    </many-to-many>
</list>
//For address.hbm.xml
<list name="persons" inverse="false" table="person_address">
        <key>
            <column name="listAddress_ID" not-null="true" />
        </key>
        <many-to-many entity-name="domains.Person">
            <column name="Person_ID" not-null="true" />
        </many-to-many>
</list>

无法在Person和Address类之间建立“多对多”关系

1 个答案: