hibernate能否實現非主鍵一對一關聯

原文鏈接

import java.io.Serializable;
 
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToOne;
import javax.persistence.Table;
 
@Entity
@Table(name = "t_testa")
public class TestA implements Serializable
{
    private static final long serialVersionUID = 5474359037731558807L;
 
    @Id
    @Column(name = "id", length = 36, nullable = false)
    private String id = "";
 
    @Column(name = "name", length = 50, nullable = false)
    private String name = "";
 
    @OneToOne(cascade = CascadeType.ALL, optional = false)
    @JoinColumn(name = "testa_id", referencedColumnName = "testb_id")	// 注意name和referencedColumnName的關係
    private TestB testB = null;
 
    public String getId()
    {
        return id;
    }
 
    public void setId(String id)
    {
        this.id = id;
    }
 
    public String getName()
    {
        return name;
    }
 
    public void setName(String name)
    {
        this.name = name;
    }
 
    public TestB getTestB()
    {
        return testB;
    }
 
    public void setTestB(TestB testB)
    {
        this.testB = testB;
    }
 
    @Override
    public int hashCode()
    {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((id == null) ? 0 : id.hashCode());
        return result;
    }
 
    @Override
    public boolean equals(Object obj)
    {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        TestA other = (TestA) obj;
        if (id == null)
        {
            if (other.id != null)
                return false;
        }
        else if (!id.equals(other.id))
            return false;
        return true;
    }
}

import java.io.Serializable;
 
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
 
@Entity
@Table(name = "t_testb")
public class TestB implements Serializable
{
    private static final long serialVersionUID = -5227555122162835236L;
 
    @Id
    @Column(name = "id", length = 36, nullable = false)
    private String id = "";
 
    @Column(name = "name", length = 50, nullable = false)
    private String name = "";
 
    @Column(name = "testb_id", length = 36, nullable = false)
    private String testb_id = "";
 
    public String getId()
    {
        return id;
    }
 
    public void setId(String id)
    {
        this.id = id;
    }
 
    public String getName()
    {
        return name;
    }
 
    public void setName(String name)
    {
        this.name = name;
    }
 
    public String getTestb_id()
    {
        return testb_id;
    }
 
    public void setTestb_id(String testbId)
    {
        testb_id = testbId;
    }
 
    @Override
    public int hashCode()
    {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((id == null) ? 0 : id.hashCode());
        return result;
    }
 
    @Override
    public boolean equals(Object obj)
    {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        TestB other = (TestB) obj;
        if (id == null)
        {
            if (other.id != null)
                return false;
        }
        else if (!id.equals(other.id))
            return false;
        return true;
    }
}