django 按時間范圍查詢數(shù)據(jù)庫實例代碼

2020-01-04 15:51:55

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從前臺中獲得時間范圍，在python/283970.html">django后臺處理request中數(shù)據(jù)，完成format，按照范圍調(diào)用函數(shù)查詢數(shù)據(jù)庫。

介紹一個簡單的功能，就是從web表單里獲取用戶指定的時間范圍，然后在數(shù)據(jù)庫中查詢此時間范圍內(nèi)的數(shù)據(jù)。

數(shù)據(jù)庫里的model舉例是這樣：

class book(models.Model):    name = models.CharField(max_length=50, unique=True)   date = models.DateTimeField()       def __unicode__(self): return self.name

假設(shè)我們從表單獲得的request.GET里面的時間范圍最初是這樣的：

request.GET = {'year_from': 2010, 'month_from': 1, 'day_from': 1,         'year_to':2013, 'month_to': 10, 'day_to': 1}

由于model里保存的date類型是models.DateTimefield() ,我們需要先把request里面的數(shù)據(jù)處理成datetime類型(這是django里響應(yīng)代碼的前半部分)：

import datetime  def filter(request):   if 'year_from' and 'month_from' and 'day_from' and/       'year_to' and 'month_to' and 'day_to' in request.GET:     y = request.GET['year_from']     m = request.GET['month_from']     d = request.GET['day_from']     date_from = datetime.datetime(int(y), int(m), int(d), 0, 0)     y = request.GET['year_to']     m = request.GET['month_to']     d = request.GET['day_to']     date_to = datetime.datetime(int(y), int(m), int(d), 0, 0)   else:     print "error time range!"

接下來就可以用獲得的 date_from 和date_to作為端點篩選數(shù)據(jù)庫了，需要用到__range函數(shù),將上面代碼加上數(shù)據(jù)庫查詢動作：

import datetime  def filter(request):   if 'year_from' and 'month_from' and 'day_from' and/       'year_to' and 'month_to' and 'day_to' in request.GET:     y = request.GET['year_from']     m = request.GET['month_from']     d = request.GET['day_from']     date_from = datetime.datetime(int(y), int(m), int(d), 0, 0)     y = request.GET['year_to']     m = request.GET['month_to']     d = request.GET['day_to']     date_to = datetime.datetime(int(y), int(m), int(d), 0, 0)     book_list = book.objects.filter(date__range=(date_from, date_to))     print book_list   else:     print "error time range!"