我需要在客户和促销之间建立一种关系模型。
我们需要有关客户促销记录客户促销记录和当前客户促销记录
数据库建模很好,但我发现很难对实体建模。
我打算使用clients_promotions表仅用于关系目的,以便客户能够知道他们的促销+每次促销的当前分数。但不知道该把当前分数储存在哪里。
实体和图表:
@Entity
@Table(name = "CLIENTS")
@SecondaryTable(name = "CLIENTS_PROMOTIONS",
pkJoinColumns = @PrimaryKeyJoinColumn(name = "ID_CLIENT"))
class Client {
@Id
@Column(name = "ID_CLIENT", nullable = false, unique = true)
Long id;
@OneToOne(cascade = CascadeType.ALL, optional = false)
@JoinColumn(name = "ID_USER", nullable = false, unique = true)
User user;
@Column(name = "NAME", nullable = false)
String name;
@Column(name = "BIRTHDAY", nullable = false)
Date birthday;
@Column(name = "EMAIL", nullable = false)
String email;
@Column(name = "SEX", nullable = false)
Character sex;
@ManyToMany
@JoinTable(name = "CLIENTS_PROMOTIONS",
joinColumns = @JoinColumn(name = "ID_CLIENT"),
inverseJoinColumns = @JoinColumn(name = "ID_PROMOTION"))
Set<Promotion> promotions;
}
-
@Entity
@Table(name = "PROMOTIONS")
class Promotion {
@Id
@Column(name = "ID_PROMOTION", nullable = false, unique = true)
Long id;
@Column(name = "ID_ESTABLISHMENT", nullable = false)
Long establishmentId;
@Column(name = "TITLE", nullable = false)
String title;
@Column(name = "LIMIT_SCORE", nullable = false)
Long limitScore;
@Column(name = "DESCRIPTION", nullable = false)
String description;
@Column(name = "REWARD", nullable = false)
String reward;
}
最佳答案
您需要为客户促销创建一个Entity
,并将此@ManyToOne
与促销和客户实体的关系建模,而不是Entity
。