從mysql DB查詢結果到列表

Question

最終我想輸出主機到列表。

try: 
    cnx = mysql.connector.connect(user='root', password='passwd', 
database='some_db') 
    cursor = cnx.cursor() 
except mysql.connector.Error as err: 
    print("Something went wrong: {}".format(err)) 

retrieveQuery = ("SELECT host_name,product from server") 
cursor.execute(retrieveQuery) 
for host,prod in cursor: 
print ("{},{}".format(host,prod)) 

結果看起來不錯：主機1，的PowerEdge]

retrieveQuery = ("SELECT host_name from server") 
cursor.execute(retrieveQuery) 
for host in cursor: 
print ("{}".format(host)) 

結果：（u'host1' ，）

爲什麼我看到（U」）使用相同的代碼，但何時只選擇一列？ 任何幫助深表感謝

Answer 1

你cursor行結果總是tuple類型，請嘗試：

for row in cursor: 
    print ("{}".format(row.host_name)) 

或

for host, in cursor: 
    print ("{}".format(host))