Why the need to commit explicitly when doing an UPDATE?

Question

Here\'s my code:

import cx_Oracle

conn = cx_Oracle.connect(usr, pwd, url)
cursor = conn.cursor()
cursor.execute(\"UPDATE SO SET STATUS=\'PE\' WHERE ID=\'100         


        

Answer 1

The DB-API spec requires that connecting to the database begins a new transaction, by default. You must commit to confirm any changes you make, or rollback to discard them.

Note that if the database supports an auto-commit feature, this must be initially off.

Pure SELECT statements, since they never make any changes to the database, don't have to have their changes committed.