Question

这是我的“收藏夹”页面的代码：

@app.route('/favorites')
@login_required
def favorites():
    cur=mysql.connection.cursor()
    r = cur.execute("SELECT post_id FROM favorites WHERE username = %s",[session['username']])
    if r==0:
        msg='No favorites Found'
        return render_template('favoritest.html',msg=msg)
    else:
        data=cur.fetchall()
        for row in data:
            pos_id = row["post_id"]
        cur.execute("SELECT* FROM posts WHERE id=%s ORDER BY created_at DESC",[pos_id])
        naa=cur.fetchall()
        cur.close()
        return render_template("favoritest.html",naa = naa)

这是我的模板：

{% block body %}
        {% for itm in naa %} 
            <tr>
<td><a href="posts/{{itm['id']}}/{{itm['title']}}">{{itm['title']}}</a></td></tr>
        {% endfor %}
{% endblock %}

即使有多个帖子，它也只显示一个帖子，那么这里有什么问题以及如何解决？

谢谢

Answer 1

在此代码段中，

for row in data:
    pos_id = row["post_id"]
cur.execute("SELECT* FROM posts WHERE id=%s ORDER BY created_at DESC",[pos_id])

您只运行一次数据库查询。因此，应将其包括在for循环中，如下所示：

for row in data:
    pos_id = row["post_id"]
    cur.execute("SELECT* FROM posts WHERE id=%s ORDER BY created_at DESC",[pos_id])

通过@Matthias评论实现了这一点

更新：

naa = []
for row in data:
    pos_id = row["post_id"]
    cur.execute("SELECT* FROM posts WHERE id=%s ORDER BY created_at DESC",[pos_id])
    naa.append(cur.fetchall())
cur.close()
return render_template("favoritest.html",naa = naa)

为什么此页面仅显示一个帖子？

1 个答案: