[英]JPA mapping, many to many with one extra column in the relation table
我有 3 個 sql 表:
Account (ID (BIGINT),...)
Card (ID (BIGINT),...)
RelationAccountCard (ACCOUNT (BIGINT), CARD(BIGINT), QUANTITY(int))
一戶多卡,一卡多戶
@Data
@Entity
public class Account {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private long id;
@ManyToMany
@JoinTable(
name = "RELATION_ACCOUNT_CARD",
joinColumns = @JoinColumn(name = "ACCOUNT"),
inverseJoinColumns = @JoinColumn(name = "CARD"))
private Set<Card> cardsOwned = new HashSet<>();
}
@Data
@Entity
public class Card {
@Id
private long id;
@JsonIgnore
@ManyToMany(mappedBy = "cardsOwned")
private java.util.Set<Account> accounts;
}
如果relationAccountCard 中的“QUANTITY”字段不存在,則上面的代碼有效。 知道我添加了“QUANTITY”字段后,我想讓代碼正常工作。 我昨天試了幾個小時沒有成功,你知道怎么做嗎?
基本上我需要替換private Set<Card> cardsOwned;
通過private Set<RelationAccountCard> relationAccountCards;
但我不知道怎么做
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