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
