From shuying at gmail.com  Thu Dec  3 02:06:24 2009
From: shuying at gmail.com (Susan)
Date: Thu, 3 Dec 2009 12:06:24 +1100
Subject: [DB-SIG] python connection to Velocis Database
Message-ID: <75fa0c3a0912021706q557a8884y4e3909feb75c006c@mail.gmail.com>

Hi,

Is there a python library for connecting to a Raima Velocis database?

Cheers,
S

From vernondcole at gmail.com  Thu Dec  3 02:56:03 2009
From: vernondcole at gmail.com (Vernon Cole)
Date: Wed, 2 Dec 2009 18:56:03 -0700
Subject: [DB-SIG] python connection to Velocis Database
In-Reply-To: <75fa0c3a0912021706q557a8884y4e3909feb75c006c@mail.gmail.com>
References: <75fa0c3a0912021706q557a8884y4e3909feb75c006c@mail.gmail.com>
Message-ID: <b7eb4a700912021756t51287121u2346fbcd74dfcf2@mail.gmail.com>

Susan:
   You failed to mention the platform on which you are running Python.
I will assume that you are running Microsoft Windows.

I was not aware of Raima before seeing your question, so I have never tried
this, but it will probably work...

I see in Raima's FAQ that they support both ODBC 3.51 and ADO.NET.
ADO can be used to connect to almost anything.
If you are running on Windows, I would guess that adodbapi.py can be used,
since it is able to use either ODBC
or ADO connections.  The example in their documentation shows a connection
string without a "Provider=" clause, which would imply that they are using
an ODBC connection.  Learn more about connection strings at
http://www.asp101.com/articles/john/connstring/default.asp
adodbapi is part of the pywin32 package:
http://sourceforge.net/projects/pywin32/

You will need to have Raima client software installed on the workstation.

There are also other Python ODBC solutions, for either Windows or Linux.
--
Vernon Cole

P.S.: Interesting to see that RDM is a registered trademark.  I once (1980s)
worked for a different database company who had "RDM" registerd to them.  I
still use that RDM database.  Small world.

On Wed, Dec 2, 2009 at 6:06 PM, Susan <shuying at gmail.com> wrote:

> Hi,
>
> Is there a python library for connecting to a Raima Velocis database?
>
> Cheers,
> S
> _______________________________________________
> DB-SIG maillist  -  DB-SIG at python.org
> http://mail.python.org/mailman/listinfo/db-sig
>
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From mal at egenix.com  Thu Dec  3 11:01:48 2009
From: mal at egenix.com (M.-A. Lemburg)
Date: Thu, 03 Dec 2009 11:01:48 +0100
Subject: [DB-SIG] python connection to Velocis Database
In-Reply-To: <75fa0c3a0912021706q557a8884y4e3909feb75c006c@mail.gmail.com>
References: <75fa0c3a0912021706q557a8884y4e3909feb75c006c@mail.gmail.com>
Message-ID: <4B178C8C.5000101@egenix.com>

Susan wrote:
> Hi,
> 
> Is there a python library for connecting to a Raima Velocis database?

According to the web page, Raima supports ODBC 3.51, so you
can use our mxODBC database adapters together with the
Raima ODBC drivers on almost all platforms supported by
Python itself.

For single-tier setups (client application and database
on the same server or the same platform, e.g. both Windows
or both Linux):

    http://www.egenix.com/products/python/mxODBC/

For multiple-tier setups (client application on a different
server or different platform, e.g. Linux and Windows):

    http://www.egenix.com/products/python/mxODBCConnect/

The mxODBC Connect setup will also help in case you have problems
finding an ODBC driver for your client application platform:
The mxODBC Connect Client works on most Python platforms
without needing an ODBC driver. You only need the ODBC driver
on the server side.

Regards,
-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, Dec 03 2009)
>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
________________________________________________________________________

::: Try our new mxODBC.Connect Python Database Interface for free ! ::::


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/

From shuying at gmail.com  Tue Dec  8 06:40:06 2009
From: shuying at gmail.com (Susan)
Date: Tue, 8 Dec 2009 16:40:06 +1100
Subject: [DB-SIG] python connection to Velocis Database
In-Reply-To: <b7eb4a700912021756t51287121u2346fbcd74dfcf2@mail.gmail.com>
References: <75fa0c3a0912021706q557a8884y4e3909feb75c006c@mail.gmail.com>
	<b7eb4a700912021756t51287121u2346fbcd74dfcf2@mail.gmail.com>
Message-ID: <75fa0c3a0912072140w7948cd54m6d627c413678c2b7@mail.gmail.com>

Thanks Vernon & Marc-Andre for your replies. Your suggestion has been
helpful and I am running Microsoft Windows. The following:

from win32com.client import Dispatch
conn = Dispatch(r'ADODB.Connection')
conn.Open("Dsn=xxx;uid=xxx;pwd=xxx")
conn.Execute('create table foo (blah char(30) )')
conn.Execute("insert into foo values('jenny')")
conn.Close()

works and creates a table 'foo'.

However, a simple select results in an error:

from win32com.client import Dispatch
conn = Dispatch(r'ADODB.Connection')
conn.Open("Dsn=xxx;uid=xxx;pwd=xxx")
 recset, affected = conn.Execute('select name from tablename')
conn.Close()

>>> recset, affected = conn.Execute('select name from tablename')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<COMObject ADODB.Connection>", line 3, in Execute
  File "C:\Python26\lib\site-packages\win32com\client\dynamic.py",
line 272, in _ApplyTypes_
    result = self._oleobj_.InvokeTypes(*(dispid, LCID, wFlags,
retType, argTypes) + args)
pywintypes.com_error: (-2147352567, 'Exception occurred.', (0, None,
None, None, 0, -2147467259), None)

Has anyone who has worked on old, esoteric databases before
encountered a similar problem and solved it?

.S

From carl at personnelware.com  Tue Dec  8 06:58:50 2009
From: carl at personnelware.com (Carl Karsten)
Date: Mon, 7 Dec 2009 23:58:50 -0600
Subject: [DB-SIG] python connection to Velocis Database
In-Reply-To: <75fa0c3a0912072140w7948cd54m6d627c413678c2b7@mail.gmail.com>
References: <75fa0c3a0912021706q557a8884y4e3909feb75c006c@mail.gmail.com>
	<b7eb4a700912021756t51287121u2346fbcd74dfcf2@mail.gmail.com>
	<75fa0c3a0912072140w7948cd54m6d627c413678c2b7@mail.gmail.com>
Message-ID: <549053140912072158n24cca001sdde3e13061a5eab9@mail.gmail.com>

On Mon, Dec 7, 2009 at 11:40 PM, Susan <shuying at gmail.com> wrote:
> Thanks Vernon & Marc-Andre for your replies. Your suggestion has been
> helpful and I am running Microsoft Windows. The following:
>
> from win32com.client import Dispatch
> conn = Dispatch(r'ADODB.Connection')
> conn.Open("Dsn=xxx;uid=xxx;pwd=xxx")
> conn.Execute('create table foo (blah char(30) )')
> conn.Execute("insert into foo values('jenny')")
> conn.Close()
>
> works and creates a table 'foo'.
>
> However, a simple select results in an error:
>
> from win32com.client import Dispatch
> conn = Dispatch(r'ADODB.Connection')
> conn.Open("Dsn=xxx;uid=xxx;pwd=xxx")
> ?recset, affected = conn.Execute('select name from tablename')
> conn.Close()
>
>>>> recset, affected = conn.Execute('select name from tablename')
> Traceback (most recent call last):
> ?File "<stdin>", line 1, in <module>
> ?File "<COMObject ADODB.Connection>", line 3, in Execute
> ?File "C:\Python26\lib\site-packages\win32com\client\dynamic.py",
> line 272, in _ApplyTypes_
> ? ?result = self._oleobj_.InvokeTypes(*(dispid, LCID, wFlags,
> retType, argTypes) + args)
> pywintypes.com_error: (-2147352567, 'Exception occurred.', (0, None,
> None, None, 0, -2147467259), None)
>
> Has anyone who has worked on old, esoteric databases before
> encountered a similar problem and solved it?

I had to connect to something (i forget exactly what) but it had
quircks.  I tried this and that, and had the best luck with

http://ceodbc.sourceforge.net

One of the best parts was getting it patched to work around some
hardcoded hack in the odbc driver I was using.   get it, try it, join
the mail list.

-- 
Carl K

From mal at egenix.com  Tue Dec  8 11:43:55 2009
From: mal at egenix.com (M.-A. Lemburg)
Date: Tue, 08 Dec 2009 11:43:55 +0100
Subject: [DB-SIG] python connection to Velocis Database
In-Reply-To: <75fa0c3a0912072140w7948cd54m6d627c413678c2b7@mail.gmail.com>
References: <75fa0c3a0912021706q557a8884y4e3909feb75c006c@mail.gmail.com>	<b7eb4a700912021756t51287121u2346fbcd74dfcf2@mail.gmail.com>
	<75fa0c3a0912072140w7948cd54m6d627c413678c2b7@mail.gmail.com>
Message-ID: <4B1E2DEB.9040102@egenix.com>

Susan wrote:
> Thanks Vernon & Marc-Andre for your replies. Your suggestion has been
> helpful and I am running Microsoft Windows. The following:
> 
> from win32com.client import Dispatch
> conn = Dispatch(r'ADODB.Connection')
> conn.Open("Dsn=xxx;uid=xxx;pwd=xxx")
> conn.Execute('create table foo (blah char(30) )')
> conn.Execute("insert into foo values('jenny')")
> conn.Close()
> 
> works and creates a table 'foo'.
> 
> However, a simple select results in an error:
> 
> from win32com.client import Dispatch
> conn = Dispatch(r'ADODB.Connection')
> conn.Open("Dsn=xxx;uid=xxx;pwd=xxx")
>  recset, affected = conn.Execute('select name from tablename')
> conn.Close()
> 
>>>> recset, affected = conn.Execute('select name from tablename')
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "<COMObject ADODB.Connection>", line 3, in Execute
>   File "C:\Python26\lib\site-packages\win32com\client\dynamic.py",
> line 272, in _ApplyTypes_
>     result = self._oleobj_.InvokeTypes(*(dispid, LCID, wFlags,
> retType, argTypes) + args)
> pywintypes.com_error: (-2147352567, 'Exception occurred.', (0, None,
> None, None, 0, -2147467259), None)
> 
> Has anyone who has worked on old, esoteric databases before
> encountered a similar problem and solved it?

We regularly add work-arounds for ODBC-driver quirks to mxODBC.
This also includes providing custom versions supporting older
versions of databases or ones that are not in common use.

Regards,
-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, Dec 08 2009)
>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
________________________________________________________________________

::: Try our new mxODBC.Connect Python Database Interface for free ! ::::


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/

From vernondcole at gmail.com  Tue Dec  8 17:49:42 2009
From: vernondcole at gmail.com (Vernon Cole)
Date: Tue, 8 Dec 2009 09:49:42 -0700
Subject: [DB-SIG] python connection to Velocis Database
In-Reply-To: <75fa0c3a0912072140w7948cd54m6d627c413678c2b7@mail.gmail.com>
References: <75fa0c3a0912021706q557a8884y4e3909feb75c006c@mail.gmail.com> 
	<b7eb4a700912021756t51287121u2346fbcd74dfcf2@mail.gmail.com> 
	<75fa0c3a0912072140w7948cd54m6d627c413678c2b7@mail.gmail.com>
Message-ID: <b7eb4a700912080849x4e1e2a57t1778b2fda6d777d5@mail.gmail.com>

Susan:

That's not a very good error message, it is true.

I suspect that your vendor's ODBC driver may be a bit light on diagnostics.

To extract the most information from the exception, try something like this:
v v v v v start Python code v v v v v
from win32com.client import Dispatch
import pywintypes
conn = Dispatch(r'ADODB.Connection')
def printADOerrors(adoConn):
        j=adoConn.Errors.Count
        if j:
            print 'ADO Errors:(%i)' % j
        for e in adoConn.Errors:
            print 'Description: %s' % e.Description
            print 'Number: %s ' % e.Number
            try:
                print 'Number constant:' % adoErrors[e.Number]
            except:
                pass
            print 'Source: %s' %e.Source
            print 'NativeError: %s' %e.NativeError
            print 'SQL State: %s' %e.SQLState
print '...Testing Sql login...'
conn.Open('DSN=test')
recset, affected = conn.Execute('select blah from foo')  # this should work
print 'affected=',affected
try:
    recset, affected = conn.Execute('select blah from xxxx') # this should
fail
except pywintypes.com_error:
    printADOerrors(conn)
conn.Close()
^ ^ ^ ^ ^ ^ ^ ^ end code ^ ^ ^ ^ ^

I tested this script on my system (The DSN "test" points to my MySQL server)
and got the following:
v v v v v v console output v v v v v
...Testing Sql login...
affected= 1
ADO Errors:(1)
Description: [MySQL][ODBC 5.1 Driver][mysqld-5.0.75-0ubuntu10.2]Table
'test.xxxx' doesn't exist
Number: -2147217865
Source: Microsoft OLE DB Provider for ODBC Drivers
NativeError: 1146
SQL State: S0002
^ ^ ^ ^ ^ ^ ^
which is much easier to understand.

With some luck you too may get something readable.

By the way, you can get the exact same results by:
v v v v v v v v
import adodbapi
print '...Testing Sql login...'
conn = adodbapi.connect('DSN=test')
crsr = conn.cursor()
crsr.execute('select blah from foo') # this should work
print 'affected=',crsr.rowcount
try:
    crsr.execute('select blah from xxxx') # this should fail
except conn.DatabaseError:
    conn.printADOerrors()
conn.close()
^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^e
Which is, IMHO, somewhat easier.
--
Vernon
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From shuying at gmail.com  Tue Dec  8 23:53:29 2009
From: shuying at gmail.com (Susan)
Date: Wed, 9 Dec 2009 09:53:29 +1100
Subject: [DB-SIG] python connection to Velocis Database
In-Reply-To: <b7eb4a700912080849x4e1e2a57t1778b2fda6d777d5@mail.gmail.com>
References: <75fa0c3a0912021706q557a8884y4e3909feb75c006c@mail.gmail.com>
	<b7eb4a700912021756t51287121u2346fbcd74dfcf2@mail.gmail.com>
	<75fa0c3a0912072140w7948cd54m6d627c413678c2b7@mail.gmail.com>
	<b7eb4a700912080849x4e1e2a57t1778b2fda6d777d5@mail.gmail.com>
Message-ID: <75fa0c3a0912081453h5c48c468xa7e778f49370a084@mail.gmail.com>

Marc-Andre, good to know but given what I know about the company I'm
doing this work for, that would be my last resort.

Vernon, "a bit light" is a bit of an under statement. :)  adodbapi
looks somewhat better..but I think the problem lies with the vendor's
odbc driver and what "should work" doesn't return any errors, useful
or otherwise -- it just doesn't return any useful data where there
should have been.

On Wed, Dec 9, 2009 at 3:49 AM, Vernon Cole <vernondcole at gmail.com> wrote:
> Susan:
>
> That's not a very good error message, it is true.
>
> I suspect that your vendor's ODBC driver may be a bit light on diagnostics.
>
> To extract the most information from the exception, try something like this:
> v v v v v start Python code v v v v v
> from win32com.client import Dispatch
> import pywintypes
> conn = Dispatch(r'ADODB.Connection')
> def printADOerrors(adoConn):
> ??????? j=adoConn.Errors.Count
> ??????? if j:
> ??????????? print 'ADO Errors:(%i)' % j
> ??????? for e in adoConn.Errors:
> ??????????? print 'Description: %s' % e.Description
> ??????????? print 'Number: %s ' % e.Number
> ??????????? try:
> ??????????????? print 'Number constant:' % adoErrors[e.Number]
> ??????????? except:
> ??????????????? pass
> ??????????? print 'Source: %s' %e.Source
> ??????????? print 'NativeError: %s' %e.NativeError
> ??????????? print 'SQL State: %s' %e.SQLState
> print '...Testing Sql login...'
> conn.Open('DSN=test')
> recset, affected = conn.Execute('select blah from foo')? # this should work
> print 'affected=',affected
> try:
> ??? recset, affected = conn.Execute('select blah from xxxx') # this should
> fail
> except pywintypes.com_error:
> ??? printADOerrors(conn)
> conn.Close()
> ^ ^ ^ ^ ^ ^ ^ ^ end code ^ ^ ^ ^ ^
>
> I tested this script on my system (The DSN "test" points to my MySQL server)
> and got the following:
> v v v v v v console output v v v v v
> ...Testing Sql login...
> affected= 1
> ADO Errors:(1)
> Description: [MySQL][ODBC 5.1 Driver][mysqld-5.0.75-0ubuntu10.2]Table
> 'test.xxxx' doesn't exist
> Number: -2147217865
> Source: Microsoft OLE DB Provider for ODBC Drivers
> NativeError: 1146
> SQL State: S0002
> ^ ^ ^ ^ ^ ^ ^
> which is much easier to understand.
>
> With some luck you too may get something readable.
>
> By the way, you can get the exact same results by:
> v v v v v v v v
> import adodbapi
> print '...Testing Sql login...'
> conn = adodbapi.connect('DSN=test')
> crsr = conn.cursor()
> crsr.execute('select blah from foo') # this should work
> print 'affected=',crsr.rowcount
> try:
> ??? crsr.execute('select blah from xxxx') # this should fail
> except conn.DatabaseError:
> ??? conn.printADOerrors()
> conn.close()
> ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^e
> Which is, IMHO, somewhat easier.
> --
> Vernon
>
>
>
>