Question

我使用以下类和MySQL数据库练习Hibernate。

@Entity
@Table(name="Student")
public class Student {

    @Id
    @GeneratedValue
    private int student_id;

    private String student_name;

    @ManyToOne(cascade=CascadeType.ALL)
    private StudentAddress address;

    @Transient
    @Temporal(TemporalType.DATE)
    private Date birthDay;

    public Student() {
    }

    public Date getBirthDay() {
        return birthDay;
    }

    public void setBirthDay(Date birthDay) {
        this.birthDay = birthDay;
    }

    public int getStudent_id() {
        return student_id;
    }

    public void setStudent_id(int rollNo) {
        this.student_id = rollNo;
    }

    public String getStudent_name() {
        return student_name;
    }

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

    public StudentAddress getAddress() {
        return address;
    }

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

@Entity
@Table(name="student_address")
public class StudentAddress {

    @Id
    @GeneratedValue
    private int address_id;

    private String address_detail;

    public int getAddress_id() {
        return address_id;
    }

    public void setAddress_id(int address_id) {
        this.address_id = address_id;
    }

    public String getAddress_detail() {
        return address_detail;
    }

    public void setAddress_detail(String address_detail) {
        this.address_detail = address_detail;
    }
}

我不断从这些sql语句中收到以下错误消息：

Hibernate: insert into student_address (address_detail) values (?)
Hibernate: insert into Student (address_address_id, student_name) values (?, ?)

错误讯息：

Unknown column '**address_address_id'** in 'field list'

我的数据库的字段名称为address_id。

Hibernate不断向address追加address_id并更改列名称。我可能会在我的数据库中将字段名称从address更改为address_address_id但是导致这种情况发生的原因。它是Hibernate中的有效行为吗？我可以更改吗？

Answer 1

default column name Hibernate用于@ManyToOne关联：

默认值（仅在使用单个连接列时适用）：连接以下内容：引用的名称关系属性或引用实体的字段或可嵌入的类; ＆＃34; _＆＃34 ;;引用的主键列的名称。如果有在实体中没有这样的引用关系属性或字段，或如果连接用于元素集合，则连接列名称为形成如下的串联：实体的名称; ＆＃34; _＆＃34 ;;引用的主键列的名称。

指定所需的列名称：

@ManyToOne(cascade=CascadeType.ALL)
@JoinColumn(name="address")
private StudentAddress address;

Hibernate更改我的字段名称

1 个答案: