Entry

VBScript is excellent for integrating with ADO (Active Data Objects) databases. Is python as facile?

Aug 25th, 2009 16:52
Joe Bloggs, unknown unknown, Eduard Hiti

I used ADO 2.5 in my last Python project, and had no problems at all. 
Most of the time, ADO access in VB translates almost directly to python 
syntax. Features of ADO I used with no problem include parameterized 
commands, batch updating and client side cursors.

One thing to keep in mind is the way pythoncom handles out-parameters of
method calls: These values are returned as part of the method result, 
e.g the Execute method of the Connection object returns a tuple 
consisting of an RecordSet object and the RecordsAffected value (see 
MSDN):

    recordset, affected = db_connect.Execute("select * from ...")

In VB you would only get the recordset returned and RecordsAffected 
would get stuffed in a reference parameter of the call.

Another point is handling of date values: They are returned as objects 
with type pywintypes.TimeType. The documentation for this type is very 
terse, and I had to dig into the pythoncom demos to find their 
interface: One useful method is Format(<formatstring>), which will 
return a string from TimeType:

    import pywintypes
    if type(x) == pywintypes.TimeType:
        return x.Format("%d.%m.%Y")

For more information on COM and Python I recommend Mark Hammond's 
"Python Programming on Win32" (which covers almost the entire COM body, 
albeit sometimes not too deeply: "Advanced Python Programming..." ?), 
which has a chapter on database programming.

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