Hibernate annotations系列之雙向一對一

Address.java 

package one2one;

import java.io.Serializable;

import javax.persistence.CascadeType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToOne;
import javax.persistence.PrimaryKeyJoinColumn;
import javax.persistence.Table;
import javax.persistence.TableGenerator;

import org.hibernate.test.annotations.Passport;

@javax.persistence.Entity
public class Address implements Serializable...{

    private Long id;

    String name;

    Address2 address2;

    public String getName() ...{
        return name;
    }

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

    public Address() ...{

    }

    @Id
/**//*    @TableGenerator(name = "empGen", allocationSize = 2000, initialValue = 100)*/
    @GeneratedValue
//    (strategy = GenerationType.TABLE, generator = "empGen")
    public Long getId() ...{
        return id;
    }

    public void setId(Long id) ...{
        this.id = id;
    }

    @OneToOne(cascade = CascadeType.ALL)
    /**//*@PrimaryKeyJoinColumn
    @JoinColumn(name = "Address2_ID") */
    public Address2 getAddress2() ...{
        return address2;
    }

    public void setAddress2(Address2 address2) ...{
        this.address2 = address2;
    }

}

 

Address2.java

 

 

package one2one;

import java.io.Serializable;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToOne;

@Entity
public class Address2 implements Serializable ...{
    private Long id;

    private Address address;

    @Id
    @GeneratedValue
    public Long getId() ...{
        return id;
    }

    public void setId(Long id) ...{
        this.id = id;
    }

    @OneToOne(mappedBy = "address2")
    public Address getAddress() ...{
        return address;
    }

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

}

兩者通過 @OneToOne(cascade = CascadeType.ALL)  和

 @OneToOne(mappedBy = "address2")  進行一對一的雙向關聯。

測試代碼：

 

    Session s = HibernateUtil.getSession();

        s.beginTransaction();
Address ass = new Address();
        ass.setName("ssss");
    
        Address2 ass2 = new Address2();
        ass.setAddress2(ass2);
        ass2.setAddress(ass);
        
        
        
        
    

        s.persist(ass);

 

還有：

 

 

    Address2  add=(Address2)    s.load(Address2.class, new Long(1));
        System.out.println(    add.getAddress().getAddress2().getId());
    ;

 

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