Re: [IBMiOSS] ibm_db and itoolkit for Python

connect/pconnect take implementation specific parameters, so they aren't
in the PEP. We should probably document them somewhere. Here's the
function definitions from the ibm_db_dbi.py:

def connect(dsn=None, user='', password='', host='', database='',
conn_options=None):
def pconnect(dsn, user='', password='', host='', database='',
conn_options=None):

(Note, host is not supported on IBM i, since you have to specify this in
the RDB)


try this:


import ibm_db_dbi as dbi

conn = dbi.pconnect(dsn=None, database='*LOCAL', user=None, password=None)


You can specify a DSN string like so:

dbi.pconnect("DATABASE=*LOCAL;UID=user;PWD=pass")


and this should be equivalent as above *LOCAL/None/None:

dbi.pconnect("DATABASE=*LOCAL")



Now that I'm looking at it again, it looks like I missed the default
parameter for dsn on pconnect. Once that's there, you can do:

dbi.pconnect(database='*LOCAL', user=None, password=None)

(Already works on connect)



Make sure you're on the latest version of ibm_db. I'm not sure if the
original shipped version of ibm_db_dbi actually worked. Since 2.0.5.1 it
should work, but I'd get to 2.0.5.4, which is shipped with SI60567.



"OpenSource" <opensource-bounces@xxxxxxxxxxxx> wrote on 06/22/2016
09:33:07 PM:

From: Jim Steil <jim@xxxxxxxxxxxxxxx>
To: IBMi Open Source Roundtable <opensource@xxxxxxxxxxxx>
Date: 06/22/2016 09:34 PM
Subject: Re: [IBMiOSS] ibm_db and itoolkit for Python
Sent by: "OpenSource" <opensource-bounces@xxxxxxxxxxxx>

I'm trying ibm_db_dbi but can't figure out the pconnect parameters.

Trying

to connect to the local database. Any pointers?

Jim
On Jun 22, 2016 8:25 PM, "John Yeung" <gallium.arsenide@xxxxxxxxx>

wrote:

On Wed, Jun 22, 2016 at 5:54 PM, Jim Steil <jim@xxxxxxxxxxxxxxx>

wrote:

Hey John - where can I get some info on ibm_db? I tried out the

itoolkit

on my IBM i today and was a bit disappointed in what I had to do to

access

the database. I'm guessing this is not going to be the preferred

method

of

db access for Python. I'd appreciate pointers to any info you have

on

ibm_db for Python...

I agree with Kevin: Under normal circumstances, you should not be
using ibm_db directly, but rather ibm_db_dbi, to get the standard
Python database interface as laid out in PEP 249. If you're a
long-time Python user, you're probably already familiar with this
interface. If not, I find the PEP is pretty good documentation for it.

To be completely honest, I have never had especially high hopes for
itoolkit, whether for accessing data or programs:

http://yips.idevcloud.com/wiki/index.php/XMLSERVICE/Python

The documentation for the underlying XMLSERVICE has been around for
quite some time now, as well as some of its wrappers in other
languages. It just seems fundamentally verbose and cumbersome, by
Python standards. The Python version (judging by the documentation
linked to above) is about as verbose as I was expecting. It looks
almost as bulky as Java, but with a style reminiscent of Ruby. Or
maybe JavaScript. (I only have a passing familiarity with those
languages.) But I haven't given it a fair shake yet, so we'll see.

If I do become a convert to IBM's Python (as opposed to the
third-party iSeriesPython which I'm using now), I may wind up writing
my own wrapper for itoolkit, or my own fork of itoolkit.

To me, itoolkit seems to be mainly for calling native programs and
service programs (mostly written by your own shop, mostly in RPG), or
IBM system APIs. Both of these uses are probably dwindling niches, as
more and more people write stored procedures and UDFs, and IBM exposes
more and more system services to SQL. Eventually, you may be able to
just do everything with ibm_db_dbi. But I know our shop is far from
that point.

John Y.
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