org.hibernate.MappingException:实体映射中的重复列

Question

我正在做一个简单的民意调查系统.我有2张桌子:

Person:ID,姓名,姓氏

Vote:ID,投票(布尔),VoterID(实际上是这个FK_PersonID),PersonID(实际上FK_PersonID也是如此).

我需要能够确定谁投票以及投票的对象 - 使用Person表中存储的人员来满足这些需求.该表Person包含可以"投票"以及"投票"的人的用户详细信息.允许人们决定是否要为自己投票.

我已在我的domain对象中映射出我的表格,如下所示:

人

    private Integer ID;
    private String name;
    private String surname;

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "ID")
    public Integer getID() {
        return ID;
    }

    public void setID(Integer ID) {
        this.ID = ID;
    }

    @Column(name = "name")
    public String getName() {
        return name;
    }

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

    @Column(name = "surname")
    public String getSurname() {
        return surname;
    }

    public void setSurname(String surname) {
        this.surname = surname;
    }

投票

private Integer ID;
private Person voter;
private Person person;
private Boolean vote;

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "ID")
public Integer getID() {
    return ID;
}

public void setID(Integer ID) {
    this.ID = ID;
}

@Column(name = "vote")
   public Boolean getVote() {
    return vote;
}

public void setVote(Boolean vote) {
    this.vote = vote;
}

@ManyToOne
@JoinColumn(name = "personID")
public Person getVoter() {
    return voter;
}

public void setVoter(Person voter) {
    this.voter = voter;
}

@ManyToOne
@JoinColumn(name = "personID")
public Person getPerson() {
    return person;
}

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

错误信息

引起:org.hibernate.MappingException:实体映射中的重复列:web.poll.domain.Vote列:personID(应使用insert ="false"update ="false"映射)

Answer 1

你@JoinColumn对选民和人使用同样的东西.改为@JoinColumn("personID")关联人和@JoinColumn("voterID")相关选民,所有人都应该没问题.

作为旁注,因为你标记了这个domain-driven-design...如果像这样实现,你的投票类会更加DDD样式:

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "ID")
private Integer ID;

@ManyToOne
@JoinColumn(name = "voterID")
private Person voter;

@ManyToOne
@JoinColumn(name = "votedForID")
private Person votedFor;

@Column(name = "vote")
private Boolean vote;

public void cast(Person voter, Person votedFor, boolean vote) {
    // Maybe assert that this vote has not already been casted
    this.voter = voter;
    this.votedFor = votedFor;
    this.vote = vote;
}

public Integer getID() {
    return ID;
}

public Boolean isUpVote() {
    return vote;
}

public Boolean isDownVote() {
    return !vote;
}

public Person getVoter() {
    return voter;
}

public Person getVotedFor() {
    return votedFor;
}

举个例子,不知道我是否得到你vote布尔权的含义来表示上/下投票.