从两个MySQL表中检索Python中的数据？

Question

I'm using Python and I'm trying to retrieve data from two mySQL tables(name = deal_info and profile) in the same database (name = begin). The two tables are not linked or do NOT have the same primary key, but I get the error

  raise errors.InternalError("Unread result found.")
mysql.connector.errors.InternalError: Unread result found.

Below is the code

import mysql.connector
from decimal import *

cnx = mysql.connector.connect(user='root', password = 'xxx', database='begin')
cursor = cnx.cursor()

query_deal_info = ("SELECT mrp, qty_remain, deal_price, qty, asp FROM deal_info WHERE deal_id = %s")
deal_id = int(input("Enter the deal id:"))
cursor.execute(query_deal_info,(deal_id,))
query_profile = ("SELECT user_id, abp1, abp2, abp3, abpf FROM profile WHERE user_id = %s")
user_id = int(input("Enter the user id:"))
cursor.execute(query_profile,(user_id,))

for (mrp, qty_remain, deal_price, qty, asp) in cursor:
 print("The MRP for the deal is {}".format(mrp))
 print ("The deal price is {}, asp is {} and qty is {}".format(deal_price, asp, qty))

for (user_id, abp1) in cursor:
  print("The ABP1, 2, 3 and f for the deal is {}, {}".format(user_id, abp1))

cursor.close()
cnx.close()

Answer 1

Per the MySQL.connector docs , you need to fetch results before executing any other statement:

In this case, you must be sure to fetch all rows of the result set before executing any other statements on the same connection, or an InternalError (Unread result found) exception will be raised.

So simply run your looped print lines after cursor.execute() :

cnx = mysql.connector.connect(user='root', password = 'xxx', database='begin')
cursor = cnx.cursor()

# DEAL INFO
query_deal_info = "SELECT mrp, qty_remain, deal_price, qty, asp \
                    FROM deal_info WHERE deal_id = %s"
deal_id = int(input("Enter the deal id:"))
cursor.execute(query_deal_info,(deal_id,))

for (mrp, qty_remain, deal_price, qty, asp) in cursor:
    print("The MRP for the deal is {}".format(mrp))
    print ("The deal price is {}, asp is {} and qty is {}".format(deal_price, asp, qty))

# PROFILE
query_profile = "SELECT user_id, abp1, abp2, abp3, abpf \
                  FROM profile WHERE user_id = %s"
user_id = int(input("Enter the user id:"))
cursor.execute(query_profile,(user_id,))

for (user_id, abp1) in cursor:
    print("The ABP1, 2, 3 and f for the deal is {}, {}".format(user_id, abp1))

cursor.close()    
cnx.close()