为什么 @Column(unique = true) 不起作用？

Question

我有以下代码：

@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
@Entity
@Table
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    @Column(name = "FIRST_NAME")
    private String firstName;

    @Column(name = "LAST_NAME")
    private String lastName;

    @NotNull
    @Column(name = "LOGIN", unique = true)
    private String login;

    @Column(name = "PASSWORD")
    private String password;

    @Column(name = "ROLE")
    private UserRole role;

    @Column(name = "E_MAIL", unique = true)
    private String email;

    @Convert(converter = UserStrategyConverter.class)
    @Column(name = "STRATEGY")
    private UserStrategy userStrategy;

    @Column(name = "SUBSCRIPTION")
    private Boolean subscription;

    @Column(name = "MONEY")
    private BigDecimal money;

我的问题：当我把这个来自邮递员的对象放在 json:

{
    "firstName": "Daniel",
    "lastName": "xxx",

    "password": "daniel",
    "role": "ROLE_USER",
    "email": "test@test.pl",
    "subscription": false,
    "money": "1200"
}

它在实体中创建对象。问题是因为我可以在列（email 和 login）中一次又一次地乘以这个对象而不是 unique = true。谁能解释一下为什么？

Answer 1

Hibernate 将仅在 schema generation 时考虑约束 unique = true。

在架构生成期间，将添加以下约束：

alter table User
add constraint UK_u31e1frmjp9mxf8k8tmp990i unique (email)

如果不使用架构生成，就没有使用 unique = true 的意义。

为什么 @Column(unique = true) 不起作用？

Why @Column(unique = true) does not work?

java

entity

hibernate