java - JPA Hibernate实体异常:org.hibernate.MappingException

我刚到春天冬眠。我创建一个具有列的表，它们的实体应像这样

School.java

@Entity
@Table(name = "school")
public class School implements Comparable<School>{

    @Transient
    private int functionValue;

    @Id
    @GeneratedValue
    private Integer id;

    @Size(min = 3, message = "Name must be at least 3 characters!")
    @UniqueUsername(message = "School Name already exists!")
    @Column(length = 1000, unique = true)
    private String name;

    private SchoolTier schoolTier1 = new SchoolTier();
    private SchoolTier schoolTier2 = new SchoolTier();
    private SchoolTier schoolTier3 = new SchoolTier();
    //their getter/setter
    }

学校层

@Entity
@Table(name = "schooltier")
public class SchoolTier {

    @Id
    @GeneratedValue
    private Integer id;

    @Id
    private Integer schoolId;

    // Pojo's
    @Size(min = 0, message = " must be at least 4 characters!")
    private String CampusImprovement;

    //getter/setter
   }

具有学校名称的表，该表具有在school.java中定义的相同列，并且还具有表schooltier，其表具有与schooltier.java中定义的相同列

但是问题出在这里，像是学校表没有“ SchoolTier”的任何列，但是在school.java中，我有3个schooltier对象。现在它给出了一个异常

Caused by: org.hibernate.MappingException: Could not determine type for com.scp.bid.entity.SchoolTier at table: school, for columns: [org.hibernate.mapping.Column(schoolTier1)]

现在该如何解决这个问题？如果我做错了，请指导我。帮我

最佳答案

使用休眠的JPA @OneToOne映射通过SchoolTier映射学校课程，

School将是父实体，就像数据库中的父实体一样，它将是具有SchoolTier实体的子表的三个外键的父表。

看起来像这样：

@Entity
@Table(name = "school")
public class School implements Comparable<School>{

@Transient
private int functionValue;

@Id
@GeneratedValue
private Integer id;

@Size(min = 3, message = "Name must be at least 3 characters!")
@UniqueUsername(message = "School Name already exists!")
@Column(length = 1000, unique = true)
private String name;

//This will create a foreign key of SchoolTier table.
@JoinColumn(name = "school_tier_id_1")
@OneToOne
private SchoolTier schoolTier1;

//This will create a foreign key of SchoolTier table.
@JoinColumn(name = "school_tier_id_2")
@OneToOne
private SchoolTier schoolTier2 = new SchoolTier();

//This will create a foreign key of SchoolTier table.
@JoinColumn(name = "school_tier_id_3")
@OneToOne
private SchoolTier schoolTier3;
//their getter/setter
}

在您的情况下，SchoolTier将是子实体。

@Entity
@Table(name = "schooltier")
public class SchoolTier {

@Id
@GeneratedValue
private Integer id;

// Pojo's
@Size(min = 0, message = " must be at least 4 characters!")
private String CampusImprovement;

//getter/setter
}