exception handling try and catch in Python

Like other programming languages such as PHP, Java and C#, you can add exception handling to your code, imagine that you are starting a connection to database and want to handle the failure cases, in the following snippet an error is thrown because of inserting two database records with the same primary key value:

Code:

myConnection = None

try:
    myConnection= sdb.connect('/tmp/myDatabase.db')
    
    myCursor = myConnection.cursor()

    myCursor.execute("INSERT INTO user(firstName,lastName) VALUES (?,?)", ('Adm','James') )

    ## try to insert a duplicate contact id
    myCursor.execute("INSERT INTO user(user_id,firstName,lastName) VALUES (?,?,?)", (1,'Joe','Ibrahim') )

    myConnection.commit()    
    
except sdb.Error, e:
    
    ## rollback because of error 
    if myConnection:
        myConnection.rollback()
        
    print "Error %s:" % e.args[0]
    sys.exit(1)
    
finally:
    
    if myConnection:
        myConnection.close()
 

_________________
M. S. Rakha, Ph.D.
Queen's University
Canada

Author: DrRakha
Mastermind

Posts: 2715
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