Django原生sql也能使用Paginator分页的示例代码

# coding=utf-8from django.core.paginator import Paginatordef paginator(data_list, per_page, page_no):  """封装Django分页"""  pages = Paginator(data_list, per_page)  # 防止超出页数  if not page_no > 0:    page_no = 1  if page_no > pages.num_pages:    page_no = pages.num_pages  p = pages.page(page_no) # 获取本页数据  data = dict() # 获取分页信息  data['count'] = pages.count  data['page_num'] = pages.num_pages  data['per_page'] = per_page  data['current'] = page_no  data['start_index'] = p.start_index() - 1  return p.object_list, page_no, dataclass QueryWrapper(object):  """查询集包装器。实现django Paginator需要的必要方法，实现和query一样使用Paginator分页"""  def __init__(self, sql, params=None, db="default"):    """    :param sql: sql语句    :param params: sql语句的params参数    :param db: 数据库名称（Django配置）    """    self.db = db    self.sql = sql    self.params = params  def count(self):    """计算总页数"""    sql = """select count(*) from (%s) _count""" % self.sql    # sql封装方法请参考https://my.oschina.net/watcher/blog/1573503    return fetchone_sql((sql, self.params), db=self.db, flat=True) # 返回总页数  def __getslice__(self, x, y):    """ self.__getslice(x, y) = self[x:y]"""    sql = self.sql + ' LIMIT {start}, {num}'.format(start=x, num=y - x)    # sql封装方法请参考https://my.oschina.net/watcher/blog/1573503    return fetchall_to_dict((sql, self.params), db=self.db) # 字典列表形式返回def demo_orm():  """使用Django的ORM分页"""  # 示例：查询status=1的用户分页，每页10条，取第2页数据（假设数据量足够）  status = 1  per_page = 10  page_no = 2  # 使用Django的ORM  from django.contrib.auth.models import User  query = User.objects.filter(status=status).values("id", "username", "first_name")  one_page_data_list, page_no, page_data = paginator(query, per_page, page_no)  # one_page_data_list 即为第二页数据，例如：[{"id": 1, "username": "111", "first_name": "aaa"}]  print one_page_data_listdef demo_raw():  """使用原生sql实现相同分页"""  # 示例：查询status=1的用户分页，每页10条，取第2页数据（假设数据量足够）  status = 1  per_page = 10  page_no = 2  sql = "select id, username, first_name from auth_user where status=%(status)s"  params = {"status": status} # 使用params防止sql注入  query = QueryWrapper(sql, params, "default")  one_page_data_list, page_no, page_data = paginator(query, per_page, page_no)  # one_page_data_list 同ORM获取数据一样  print one_page_data_listif __name__ == "__main__":  demo_orm()  demo_raw()