java - 为什么@UniqueConstraint在 hibernate 中不起作用？

Question

我添加了唯一约束注释，但仍然可以插入重复条目。

@Entity
@Table(uniqueConstraints = {@UniqueConstraint(columnNames = {"firstName", "LastName"})})
public class Student {
    @Id
    @GeneratedValue(strategy =  GenerationType.IDENTITY)
    private Long id;
    private String firstName;
    private String LastName;
    //getter and setter and no-arg constructor

 Session session = HibernateUtil.getSessionFactory().openSession();
        session.beginTransaction();
        Student student1 = new Student("alireza", "rayani");
        Student student2 = new Student("alireza", "rayani");
        session.save(student1);
        session.save(student2);
        session.getTransaction().commit();

Answer 1

终于，我发现了问题，我改变了方言

properties.put(Environment.DIALECT,"org.hibernate.dialect.MySQL5Dialect");

到

properties.put(Environment.DIALECT, "org.hibernate.dialect.MySQL57Dialect");