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django 编程小结

1.增删改查

  add

    obj = Obj(atr=atr..)

    obj.save()

  update:

    __dict__ 遍历

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  del:

    根据id列表删除

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  query:

    首次查询:

      直接跳转至页面,前端页面自动调用ajax异步方法查询

    根据条件查询:

      使用分页类和将参数字典化传入

 

工具:

  将request.POST or request.GET 的 keyValue turn into dictionary, 配合method (**kwargs)

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  分页工具:

   

		# 分页查询工具类
		class Pagination(object):
		    def __init__(self, totalCount, currentPage, perPageItemNum, maxPageNum):
		        # 数据总个数
		        self.total_count = totalCount
		        # 当前页
		        try:
		            v = int(currentPage)
		            if v <= 0:
		                v = 1
		            self.current_page = v
		        except Exception as e:
		            self.current_page = 1
		        # 每页显示的行数
		        self.per_page_item_num = perPageItemNum
		        # 最多显示页面
		        self.max_page_num = maxPageNum
		
		    def start(self):
		        return (self.current_page-1) * self.per_page_item_num
		
		    def end(self):
		        return self.current_page * self.per_page_item_num
		
		    @property
		    def num_pages(self):
		        """
		        总页数
		        """
		        a, b = divmod(self.total_count, self.per_page_item_num)
		        if b == 0:
		            return a
		        return a+1
		
		    @property
		    def pager_num_range(self):
		        # self.current_page     当前页
		        # self.per_pager_num    每页显示条数
		        # self.num_pages        总页数
		        # self.max_page_num     page导航栏总页数
		        if self.num_pages < self.max_page_num:
		            return range(1, self.num_pages+1)
		        # 总页数特别多 5
		        part = int(self.max_page_num/2)
		        if self.current_page <= part:
		            return range(1, self.max_page_num+1)
		        if (self.current_page + part) > self.num_pages:
		            return range(self.num_pages-self.max_page_num+1, self.num_pages+1)
		        return range(self.current_page-part, self.current_page+part+1)
		
		    def to_dict(self):
		        return json.loads(json.dumps({‘current_page‘: self.current_page, ‘num_pages‘: self.num_pages,
		                                      ‘max_page_num‘: self.max_page_num, ‘per_pager_num‘: self.per_page_item_num,
		                                      ‘pager_num_range‘: self.pager_num_range,}))
		
		    def page_str(self):
		        """
		            在后台封装前台分页导航栏,适用于单页面参数
		            前端页面引用方法: 
		            <ul class="pagination pagination-sm" style="margin: 0 0">
		                {{ page_obj.page_str | safe }}
		            <ul>
		        :return:  分页导航栏
		        """
		        page_list = []
		        first = "<li><a href=http://www.mamicode.com/‘?p=1‘>首页"
		        page_list.append(first)
		
		        if self.current_page == 1:
		            prev = "<li><a href=http://www.mamicode.com/‘#‘>上一页"
		        else:
		            prev = "<li><a href=http://www.mamicode.com/‘?p=%s‘>上一页" % (self.current_page-1,)
		        page_list.append(prev)
		        for i in self.pager_num_range():
		            if i == self.current_page:
		                temp = "<li class=‘active‘><a href=http://www.mamicode.com/‘?p=%s‘>%s" % (i, i)
		            else:
		                temp = "<li><a href=http://www.mamicode.com/‘?p=%s‘>%s" % (i, i)
		            page_list.append(temp)
		
		        if self.current_page == self.num_pages:
		            nex = "<li><a href=http://www.mamicode.com/‘#‘>下一页"
		        else:
		            nex = "<li><a href=http://www.mamicode.com/‘?p=%s‘>下一页" % (self.current_page + 1,)
		        page_list.append(nex)
		
		        last = "<li><a href=http://www.mamicode.com/‘?p=%s‘>尾页" % (self.num_pages,)
		        page_list.append(last)
		
		        return ‘‘.join(page_list)

  

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django 编程小结