Question

许多小时以来，我一直在不懈地努力以使此代码正常工作。

我需要使用django的sql查询在json中显示数据库中的帖子和评论结果

下面是我期望的json格式。

[
{"id":"1","title":"post title 1","content":"post content 1.","comment":[{"comment":"comment 1 post 1."},{"comment":"comment 2 post 1."}]},
{"id":"2","title":"post title 2.","content":"post content 2","comment":[{"comment":"comment3 post 2."}]},
{"id":"3","title":"post title 3","content":"post content 3","comment":[]}
]

当我运行下面的代码时，所有的帖子记录都会显示，并且缺少一些注释。 这就是我得到的

[
{"id": 1, "title": "post title 1", "content": "post content 1.", "comment": {"comid": 4, "comment": "coment 4 for post 1"}}, 
{"id": 2, "title": "post title 2.", "content": "post content 2", "comment": {"comid": 3, "comment": "coment 3 for post 2"}},
{"id": 3, "title": "post title 3", "content": "post content 3", "comment": {"comid": 3, "comment": "coment 3 for post 2"}}
]

我的问题： 数组中缺少一些注释

实例：

1。） ID为1 的帖子在数组中应该有两个评论，但只是希望看到一个附加到该Postid的评论。

2。） ID为3的帖子没有任何评论，但看到其postid附带了评论

我想知道退出循环时该问题是否与标识有关。

有人可以帮我解决问题吗

这是代码

def read(request):
    sql = 'SELECT * from crud_posts'
    with connection.cursor() as cursor1:
         cursor1.execute(sql)
         output = cursor1.fetchall()
         #print(output[0])
         items=[]
         for row in output: 
             postid = row[0]
             #Get comments
             sql2 = "SELECT * from crud_comment where postid= %s"
             pid = (postid)
             with connection.cursor() as cursor2:
                  cursor2.execute(sql2, pid)
                  output2 = cursor2.fetchall()
                  items2=[]
                  for row2 in output2:
                      comment_array = {'comid':row2[0], 'comment': row2[3]}
                      #comment_array = items2.append({'comid':row2[0], 'comment': row2[3]})
                      print('this is comment array:', comment_array)

             items.append({'id':row[0], 'title': row[1],'content': row[2], 'comment': comment_array})
         jsondata = json.dumps({'items': items})
         return HttpResponse(jsondata, content_type='application/json')

这是 models.py

class Posts(models.Model):
    title = models.CharField(max_length=40)
    content = models.CharField(max_length=400)

    def __str__(self):
        return self.title + " " + self.content


class Comment(models.Model):
    userid = models.IntegerField()
    postid = models.IntegerField()
    comment = models.CharField(max_length=400)
    def __str__(self):
        return self.userid + " " + self.postid

通过Django遍历mysql记录时缺少一些注释

0 个答案: