如何從python查詢中獲取列？

Question

我在python程序中有這樣的查詢：

而且我應該爲查詢中的每列創建一個多維數組（如果可能）或四個數組。

你能提出一個優雅的方式來解決它嗎？

conn = #connection to the server 
cursor=conn.cursor() 
query = (" select id, name, phone, city from guest") 

cursor.execute(query) 
results = cursor.fetchall 
for i in results: 
    print i 
cursor.close() 
conn.close() 

Answer 1

不優雅，但它可以幫助解開這個神祕的Python接口Cursor類和元組（見科波菲爾評論）與查詢，數據列表傳輸到一個列表（PHONELIST）詞典（項）與數據庫中的每個條目的細節，這可能是更容易在你的python腳本一起工作：

# ref: https://dev.mysql.com/doc/connector-python/en/connector-python-api-mysqlcursor.html 
import mysql.connector 

db = 'test' 
table = 'phonebook' 
phoneList = [] 

drop_table = ("DROP TABLE IF EXISTS {};").format(table) 
# By default, the starting value for AUTO_INCREMENT is 1, and it will increment by 1 for each new record. 
# To let the AUTO_INCREMENT sequence start with another value, use the following SQL statement: 
# ALTER TABLE phonebook AUTO_INCREMENT=100; 
create_table = ("CREATE TABLE {} (" 
      "id int NOT NULL AUTO_INCREMENT," 
      "name varchar(30) NOT NULL," 
      "phone varchar(30) NOT NULL," 
      "city varchar(30) NOT NULL," 
      "PRIMARY KEY (id))" 
      " ENGINE=InnoDB DEFAULT CHARSET=latin1;").format(table) 

Names = {'Bill':{'phone':'55123123','city':'Melbourne'}, 
    'Mary':{'phone':'77111123','city':'Sydney'}, 
    'Sue':{'phone':'55888123','city':'Melbourne'}, 
    'Harry':{'phone':'77777123','city':'Sydney'}, 
    'Fred':{'phone':'88123444','city':'Yongala'}, 
    'Peter':{'phone':'55999123','city':'Melbourne'}} 


cnx = mysql.connector.connect(user='mysqluser', password='xxxx',host='127.0.0.1',database=db) 
cursor = cnx.cursor(dictionary=True) # key to using **row format 
cursor.execute(drop_table) 
cursor.execute(create_table) 
# populate db 
for name,detail in dict.items(Names): 
    sql = ("INSERT INTO {} (name,phone,city) VALUES ('{}','{}','{}')".format(table,name,detail['phone'],detail['city'])) 
    cursor.execute(sql) 

sql = ("SELECT id,name,phone,city FROM {}".format(table)) 
cursor.execute(sql) 

for row in cursor: 
    print("{id} {name} {phone} {city}".format(**row)) 
    phoneList.append(row) 

print phoneList[0]['name'],phoneList[0]['city'] 
print phoneList[3]['name'],phoneList[3]['phone'] 


for entries in phoneList: # list of dictionaries 
    print entries['name'],entries 

for entries in phoneList: 
    for k,v in dict.items(entries): 
     print k,v 
    print "\n" 

cnx.close()