Java：数据表的字段设计了默认值0不生效的原因

@Data
@TableName(value = "user")
@NoArgsConstructor
@AllArgsConstructor
public class UserEntity{

    @TableId
    @ApiModelProperty("Id")
    private Integer id;

    @ApiModelProperty("用户名")
    private String username;

    @ApiModelProperty("密码")
    private String password;

    @ApiModelProperty("性别")
    private Integer gender;

    @ApiModelProperty("创建时间")
    private LocalDateTime createTime;

    private Integer deleted;
}

UserEntity userEntity = new UserEntity();
        userEntity.setId(5);
        userEntity.setGender(0);
        userEntity.setUsername("username");
        userEntity.setPassword("123214");

        LocalDateTime dateTime = LocalDateTime.now();
        userEntity.setCreateTime(dateTime);

        userService.save(userEntity);