Connect pyodbc to Postgres - postgresql

Question

Trying to connect to Postgres using pyodbc.
I can connect to the DB with isql:
echo "select 1" | isql -v my-connector
Returns:
+---------------------------------------+
| Connected! |
| |
| sql-statement |
| help [tablename] |
| quit |
| |
+---------------------------------------+
SQL> select 1
+------------+
| ?column? |
+------------+
| 1 |
+------------+
SQLRowCount returns 1
1 rows fetched
But when I try to connect with pyodbc:
import pyodbc
con = pyodbc.connect("DRIVER={PostgreSQL Unicode}; DATABASE=<dbname>; UID=<username>; PWD=<password>; SERVER=localhost; PORT=5432;")
I get the following error:
pyodbc.Error: ('08001', '[08001] [unixODBC]connction string lacks some options (202) (SQLDriverConnect)')
obdc.ini file looks like this:
[my-connector]
Description = PostgreSQL connection to '<dbname>' database
Driver = PostgreSQL Unicode
Database = <dbname>
Servername = localhost
UserName = <username>
Password = <password>
Port = 5432
Protocol = 9.3
ReadOnly = No
RowVersioning = No
ShowSystemTables = No
ShowOidColumn = No
FakeOidIndex = No
ConnSettings =
odbcinst.ini file looks like this:
[PostgreSQL ANSI]
Description = PostgreSQL ODBC driver (ANSI version)
Driver = psqlodbca.so
Setup = libodbcpsqlS.so
Debug = 0
CommLog = 1
UsageCount = 1
[PostgreSQL Unicode]
Description = PostgreSQL ODBC driver (Unicode version)
Driver = psqlodbcw.so
Setup = libodbcpsqlS.so
Debug = 0
CommLog = 1
UsageCount = 1
Notes:
Ubuntu 14.04
Python 3
Postgresql 9.3
I have used psycopg2 in the past to connect to Postgres, however my current company uses Netezza, Postgres, and MySQL. I want to write 1 connection module, and use different drivers to connect to the different databases.
Any help would be greatly appreciated.
-- Thanks

Answer 1

Since you already have a working DSN defined in odbc.ini you can just use that:
con = pyodbc.connect("DSN=my-connector")
Also, for the record, that extra whitespace in your connection string may have been confusing the issue because this worked fine for me, under Python 2.7 at least
import pyodbc
conn_str = (
"DRIVER={PostgreSQL Unicode};"
"DATABASE=postgres;"
"UID=postgres;"
"PWD=whatever;"
"SERVER=localhost;"
"PORT=5432;"
)
conn = pyodbc.connect(conn_str)
crsr = conn.execute("SELECT 123 AS n")
row = crsr.fetchone()
print(row)
crsr.close()
conn.close()