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Asked: 2026-05-11T00:25:55+00:00

I’m having some trouble updating a row in a MySQL database. Here is the

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I’m having some trouble updating a row in a MySQL database. Here is the code I’m trying to run:

import MySQLdb  conn=MySQLdb.connect(host='localhost', user='root', passwd='pass', db='dbname') cursor=conn.cursor()  cursor.execute('UPDATE compinfo SET Co_num=4 WHERE ID=100') cursor.execute('SELECT Co_num FROM compinfo WHERE ID=100') results = cursor.fetchall()  for row in results:     print row[0]  print 'Number of rows updated: %d' % cursor.rowcount  cursor.close() conn.close()

The output I get when I run this program is:

4
Number of rows updated: 1

It seems like it’s working but if I query the database from the MySQL command line interface (CLI) I find that it was not updated at all. However, if from the CLI I enter UPDATE compinfo SET Co_num=4 WHERE ID=100; the database is updated as expected.

What is my problem? I’m running Python 2.5.2 with MySQL 5.1.30 on a Windows box.

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1 Answer

  1. I am not certain, but I am going to guess you are using a INNODB table, and you haven’t done a commit. I believe MySQLdb enable transactions automatically.

    Call conn.commit() before calling close.

    From the FAQ: Starting with 1.2.0, MySQLdb disables autocommit by default

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