创建条件构造器传入实体对象时，没有设置主键值，查询SQL日志显示主键值为0

/**
 * 创建条件构造器时传入实体对象
 */
@Test
public void selectByWrapperEntity(){
    User whereUser = new User();
    whereUser.setName("Jack");
    whereUser.setAge(20);

    QueryWrapper<User> queryWrapper = new QueryWrapper<User>(whereUser);

    List<User> userList = userMapper.selectList(queryWrapper);
    userList.forEach(System.out::println);
}

##### SQL日志执行如下

==>  Preparing: SELECT id,name,age,email FROM user WHERE id=? AND name=? AND age=?
==> Parameters: 0(Long), Jack(String), 20(Integer)
<==      Total: 0