Month: November 2013

NBFFI version of the OpenDBXDriver

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Hi!

We have built a NBFFI version of the OpenDBXDriver. The main idea of this is to provide a backward compatibility layer to people that  use OpenDBX, while letting us move forward dropping the old FFI implementation. SLIDES

The configuration still supports to load the former version of the driver (no NBFFI)

  Gofer it
	smalltalkhubUser: 'DBXTalk' project: 'Configurations';
	configurationOf: 'OpenDBXDriver';
	load.
(((Smalltalk at: #ConfigurationOfOpenDBXDriver)
   perform: #project)
       perform: #version: with: ‘1.3’)
           load: 'FFIDriver'.

And the configuration with only NBFFI version.

 Gofer it
	smalltalkhubUser: 'DBXTalk' project: 'Configurations';
	configurationOf: 'OpenDBXDriver';
	load.
(((Smalltalk at: #ConfigurationOfOpenDBXDriver)
   perform: #project)
       perform: #version: with: ‘1.3’)
           load:  'NBFFIDriver'.

To use, writte in the Workspace and DoIt:

“to set the NBFFI bind”
LibOpenDBXMap initialize.
 OpenDBX current: NBPharoOpenDBX new.
	“or to set the oldFFI bind”
 OpenDBX current: FFIOpenDBX  ffiImplementationForOS .

Bye! 😀

This entry was posted in pharo.

Exceptions in Python

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This post is dedicated to python, especially the handling of exceptions in the language, I take for granted that you already understand the concept, and I only concentrate on the syntax and variations that will allow the language. I will show how to create, throw, catch and test exceptions in python

Create Exceptions

class MiException(Exception):
   def__init__(self, value):
        self.value = value
   def__str__(self):
        return repr(self.value)

Throw Exceptions

if(some validation):
   #OK!
else:
   raise Exception

Catch Exceptions:

try:
    #/*code that can throw exception*/
except:
    #/*do something if the exception is launched*/

Catch Exceptions:Discriminate by type of exception

try:
    #/*code that can throw exception*/
except NameError:
   print "The variable doesn't exist"
except ValueError:
    print "The value is not a number"

Catch Exceptions:Capture several exceptions in the same except

try:
   #code that can throw exception
except (NameError, ValueError):
    print "error"

Catch Exceptions:Do something if the exception is not thrown

try:
   #code that can throw exception
except:
    print "error"
else:
    print "It is OK"

Catch Exceptions:With finally/p>

try:
    z = x / y
except ZeroDivisionError:
    print "Division for Zero"
finally:
    print "Clean..."

Test Exceptions

Test: methods without parameters


def test_afunction_throws_exception(self):
    self.assertRaises(ExpectedException, afunction)

Test: methods with parameters


def test_afunction_throws_exception(self):
    self.assertRaises(ExpectedException, afunction, arg1, arg2)

Bye! 🙂

This entry was posted in Python.