Question

我正在设置聊天应用程序的分页，该应用程序只能使用flask python和mysql在页面上允许前10个

@app.route('/chats', defaults={'page':1}, methods=['GET', 'POST'])
@app.route('/chats/page/<int:page>', methods=['GET', 'POST'])
def chats(page):
  if 'lid' in session:
    id = session['lid']
    uid = session['uid']
    # Create cursor
    perpage = 10
    startat = page * perpage
    cur = mysql.connection.cursor()
    # Get message
    cur.execute("SELECT * FROM message WHERE (msg_by=%s AND msg_to=%s) 
                OR (msg_by=%s AND msg_to=% s) limit %s, %s"
                "ORDER BY id ASC", (uid, id, id, uid)(startat,perpage))
    chats = cur.fetchall()
    # Close Connection
    cur.close()
    return render_template('chats.html', chats=chats,)
  return redirect(url_for('login'))

这向我显示了错误（1064，“您的SQL语法有错误；但是我找不到，如果有人在那里解决此问题，请帮助

Answer 1

您需要先使用ORDER BY，然后根据SQL标准应用LIMIT。

将您的sql查询更改为：

cur.execute("SELECT * FROM message WHERE (msg_by=%s AND msg_to=%s) 
             OR (msg_by=%s AND msg_to=% s) ORDER BY id ASC limit %s, %s", 
            (uid, id, id, uid)(startat,perpage))

如何使用python修复特定查询以使用分页

1 个答案: