Hibernate的一对一关系

一对一关系的维护有两种，分为主键关联和唯一外键关联

一对一关系的维护有两种，分为主键关联和唯一外键关联

主键关联：（双向）
(主控方) 

Person.java
Person {

    private String username;
    //对被控方的引用
    private Address address;

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public Address getAddress() {
        return address;
    }

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


}

(被动方) 
Address.java
Address{

    private String addressName;
    //对主控方的引用
    private Person person;

    public String getAddressName() {
        return addressName;
    }

    public void setAddressName(String addressName) {
        this.addressName= addressName;
    }

    public Person getPerson() {
        return person;
    }

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

    public String toString() {
        return new ToStringBuilder(this).
        append("addressName", addressName).
        toString();
    }
    

    public boolean equals(Object o) {
        if ( !(o instanceof Address)  {
            return false;
           }
        Address rhs = (Address) o;
          return new EqualsBuilder()
                         .appendSuper(super.equals(o))
                         .append(this.addressName, rhs.getAddressName())
                         .isEquals();
    }

    public int hashCode() {
        return new HashCodeBuilder(17, 37).
        append(addressName).
        toHashCode();
    }

}
mapping 文件

<class name="Person" table="person">
<id name="id" type="long" column="id">
<generator class="native"/>
</id>
<property name="username" column="username" type="string"/>
<one-to-one
name="address"
class="Address"
cascade="all"
constrained="false"
/>
</class>

<class name="Address" table="Address" >
<id name="id" column="id">
<generator class="foreign">
                      <param name="property">person</param>
                  </generator>
        </id>
        <one-to-one name="person" class="Person" constrained="true"/>
<property name="addressName" column="addressName" type="string"/>
</class>

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