如何在Hibernate实体中添加列约束

Question

我正在创建一个内存HSQL数据库，其中包含createin my hibernate.cfg.xml 并映射用户实体。如何在名字上设置约束以仅接受字母或性别以仅接受“M”或“F”？或者我必须在更新数据库之前验证？“

    @Entity
        @Table(name = "User",uniqueConstraints = {@UniqueConstraint(columnNames = "ID")})
        @JsonIgnoreProperties({ "hibernateLazyInitializer", "handler" })
        public class User implements Serializable
        {
          @Id
          @GeneratedValue
          @Column(name = "ID",unique = true, nullable = false)
          private long id;

          @Column(name = "FIRST_NAME",unique = false, nullable = false, length = 100)
          private String firstName;
         @Column(name = "GENDER",unique = false, nullable = false)
         private String gender;