I really shouldn't have brought it up. It is specifically asking as a beginner, and we should encourage the use of the two you list below. I meant the old ibm_db module. This works, but I would never use it. Last line should be indented. I went looking for an example, and even all my old test programs have been converted to dbi. As you say below, one of the two reasonable choices.

#!/usr/bin/env python3

import ibm_db as db2

query = "select cusnum, lstnam as Last_Name, init, cdtlmt, qc.* from qiws.qcustcdt qc where cdtlmt > 100"

conn = db2.connect("*LOCAL","validusername","validpassword");
statement = db2.prepare(conn,query)
cols = db2.num_fields(statement)
for i in range(0,cols):

On Mon, 2021-12-06 at 12:02 -0500, John Yeung wrote:
On Mon, Dec 6, 2021 at 8:31 AM Kevin Bucknum <Kevin@xxxxxxxxxxxxxxxxxxx<mailto:Kevin@xxxxxxxxxxxxxxxxxxx>> wrote:

Here is another way if you use the dbi connector. I think there is something similar for the db2 one.

Not sure which one you mean when you say "the db2 one". There are
basically two reasonable choices for connecting to the built-in
database on the IBM i (that is, the QSYS.LIB stuff) from Python. One
is ibm_db_dbi, which is a module within the ibm_db package. The other
is pyodbc. Both ibm_db_dbi and pyodbc provide an interface conforming
to PEP 249:


conn = db2.connect()
cur = conn.cursor()

for column_variable in cur.description:
column_name = column_variable[0]

The `description` attribute of the cursor object is one of the things
specified by PEP 249; it's not specific to ibm_db_dbi.

It's a good thing to be aware of, because if you just need the column
name or simple type information, then `description` is probably the
easiest way to get it.

If, like OP, you want the DDS column headings, then you have to look elsewhere.

John Y.

Kevin Bucknum

Senior Programmer Analyst


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