Question

原谅我的无知。我是一个尝试学习编程的新手。

我在Visual Studio 2010中实现了以下代码：

def print_tmpsalary():
import sys
import MySQLdb
FD_playerpicker = []
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try:
    conn = MySQLdb.connect(db="FanDueldb",host="localhost",user="root",passwd="password");
    print "Connected<br/>"
except:
    print "Cannot connect to server.</br>"
    sys.exit(1)

try:
    cursor = conn.cursor()
    for playerdata in FD_playerpicker:
        x = FD_playerpicker[playerdata][0]
        cursor.execute("INSERT INTO `fandueldb`.`tblfdsalarytmp` (PlayerID,Position,Player,Placeholder1,Placeholder2,PlaceHolder3,Salary,PPG,GamesPlayed,PlaceHolder4,PlaceHolder5,PlaceHolder6) VALUES (%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s)",(playerdata,FD_playerpicker[playerdata][0],FD_playerpicker[playerdata][1],FD_playerpicker[playerdata][2],FD_playerpicker[playerdata][3],FD_playerpicker[playerdata][4],FD_playerpicker[playerdata][5],FD_playerpicker[playerdata][6],FD_playerpicker[playerdata][7],FD_playerpicker[playerdata][8],FD_playerpicker[playerdata][9],FD_playerpicker[playerdata][10]))


    cursor.execute("SELECT * FROM tblFDSalarytmp WHERE RecordID = 1")
    result = cursor.fetchall()
    for record in result:
        print record[0] , "-->", record[1]

    #cursor.close()
except MySQLdb.Error, e:
    print "query failed<br/>"
    print e

conn.close()
print "Disconnected<br/>"
sys.exit(0)

代码运行没有错误，我可以在调试代码时打印出结果。但是当我打开MySQL工作台来查看写入的数据时，什么都没有。有一个名为recordID的自动增量字段已递增，因此我知道数据已“触及”数据库，但就好像代码停止运行后它会被删除一样。

第一次使用任何这样的数据库，我知道有些东西我只是不理解。非常感谢任何帮助，谢谢大家！

Answer 1

我相信MySQLdb默认禁用自动提交。在所有.commit()语句执行完毕后，您需要在连接上调用INSERT。

cursor = conn.cursor()
for playerdata in FD_playerpicker:
    x = FD_playerpicker[playerdata][0]
    cursor.execute("INSERT INTO `fandueldb`.`tblfdsalarytmp` (PlayerID,Position,Player,Placeholder1,Placeholder2,PlaceHolder3,Salary,PPG,GamesPlayed,PlaceHolder4,PlaceHolder5,PlaceHolder6) VALUES (%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s)",(playerdata,FD_playerpicker[playerdata][0],FD_playerpicker[playerdata][1],FD_playerpicker[playerdata][2],FD_playerpicker[playerdata][3],FD_playerpicker[playerdata][4],FD_playerpicker[playerdata][5],FD_playerpicker[playerdata][6],FD_playerpicker[playerdata][7],FD_playerpicker[playerdata][8],FD_playerpicker[playerdata][9],FD_playerpicker[playerdata][10]))

# Commit following all INSERT statements
conn.commit()

From the MySQLdb FAQ:

从1.2.0开始，默认情况下，MySQLdb根据DB-API标准（PEP-249）的要求禁用自动提交。如果您使用的是InnoDB表或其他类型的事务表类型，则需要在关闭连接之前执行connection.commit（），否则您的更改都不会写入数据库。

从python写入数据到MYSQL数据库不是持久的

1 个答案: