Why Aren\'t My MySQL Updates in Python Taking Effect?

MySQL Updates in Python: Addressing Failed Updates

When executing MySQL update queries in Python scripts, one may encounter the issue where the update command reports successful execution, but the table remains unchanged. To rectify this, it is crucial to understand the concept of transactions and commits in MySQL.

Transactions are a set of operations that are executed as a single unit. In MySQL, a transaction begins when an update query is executed and ends when the transaction is committed. If a transaction is not committed, any changes made during that transaction are not permanent and will be discarded.

To address the issue described in the question, the missing step is issuing a commit command after the update query has been executed. This commit command informs the MySQL server that all changes made within the transaction should be permanently saved to the database.

The following code snippet demonstrates the use of the commit command:

import MySQLdb

dbb = MySQLdb.connect(host="localhost", user="user", passwd="pass", db="database")
try:
    curb = dbb.cursor()
    curb.execute("UPDATE RadioGroups SET CurrentState=1 WHERE RadioID=11")
    dbb.commit()  # Commit the transaction
    print("Row(s) were updated :" + str(curb.rowcount))
    curb.close()
except MySQLdb.Error as e:
    print("Query failed")
    print(e)

By including the dbb.commit() statement, all changes made within the transaction, including the update to the RadioGroups table, will be permanently saved to the database.

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