从python将数据写入MYSQL数据库不持久

Question

Forgive my ignorance. I'm a rookie trying to learn some programming.

I have the following code implemented in Visual Studio 2010:

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)

The code runs without error, and I can print out results when debugging the code. But when I open MySQL workbench to view the written data, nothing is there. There is an auto increment field called recordID that has been incremented, so I know the data has "touched" the database, but it's as if it gets deleted once the code stops running.

First time using any such database, I know there's something I'm just not understanding. Any help would be very appreciated, thanks everyone!

Answer 1

I believe MySQLdb disables autocommit by default. You'll need to call .commit() on your connection after all your INSERT statements have been executed.

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:

Starting with 1.2.0, MySQLdb disables autocommit by default, as required by the DB-API standard (PEP-249). If you are using InnoDB tables or some other type of transactional table type, you'll need to do connection.commit() before closing the connection, or else none of your changes will be written to the database.