how connect to vertica using pyodbc

Question

I've read the iODBC documentation regarding the odbc.ini, and the Vertica documentation. I also saw a question with the same error, but can't get the connection string to work as suggested in the previous question's answer.

What I currently have:

/etc/odbcinst.ini

[HPVertica]
Description = HP Vertica ODBC Driver
Driver = /opt/vertica/lib64/libverticaodbc.so

/etc/odbc.ini

[ODBC Data Sources]
VerticaDB1 = db1 database on HP Vertica

[VerticaDB1]
Description = db1 database on HP Vertica
Driver = HPVertica
Database = db1
Servername = 10.0.0.67
UID = dbadmin
PWD = 
Port = 5433
Locale = en_GB

[ODBC]
Threading = 1

~/.odbc.ini

[DEFAULT]

Driver = VerticaDB1

Testing with isql

[root@ip-10-0-0-67 /]# echo "select 1;" | isql -v VerticaDB1
+---------------------------------------+
| Connected!                            |
|                                       |
| sql-statement                         |
| help [tablename]                      |
| quit                                  |
|                                       |
+---------------------------------------+
SQL> select 1;
+---------------------+
| ?column?            |
+---------------------+
| 1                   |
+---------------------+
SQLRowCount returns 1
1 rows fetched

odbcinst -j outputs:

unixODBC 2.2.14
DRIVERS............: /etc/odbcinst.ini
SYSTEM DATA SOURCES: /etc/odbc.ini
FILE DATA SOURCES..: /etc/ODBCDataSources
USER DATA SOURCES..: /root/.odbc.ini
SQLULEN Size.......: 8
SQLLEN Size........: 8
SQLSETPOSIROW Size.: 8

In Python using "VerticaDB1":

>>> import pyodbc
>>> conn = pyodbc.connect("DRIVER={VerticaDB1};UID={dbadmin};PWD={...}")
Traceback (most recent call last):
  File "", line 1, in 
pyodbc.Error: ('IM002', '[IM002] [unixODBC][Driver Manager]Data source name not 
found, and no default driver specified (0) (SQLDriverConnect)')

In Python using "HPVertica":

>>> import pyodbc
>>> conn = pyodbc.connect("DRIVER={HPVertica};UID={dbadmin};PWD={...}")
Traceback (most recent call last):
  File "", line 1, in 
pyodbc.Error: ('HY000', '[HY000] [unixODBC][Vertica][ODBC] (10430) Not enough 
information provided to establish a connection to the data source and specified 
to not prompt for more information. (10430) (SQLDriverConnect)')

Lilt

Answer 1

Try connecting using DSN:

conn = pyodbc.connect("DSN=VerticaDB1;UID=dbadmin;PWD=mypassword")

Alternatively, you can connect using DRIVER, but you need to supply more information, like which database, host, and port:

conn = pyodbc.connect("DRIVER=HPVertica;SERVER=10.0.0.67;DATABASE=db1;PORT=5433;UID=dbadmin;PWD=mypassword")

Rupertruperta

Using the DSN results in the same Data source name not found... error. Using DRIVER works :) – Lilt

On a side note, pyodbc accepts kwargs as well as a string. eg. instead of the first example, you could type: conn = pyodbc.connect(DSN="VerticaDB1", UID="dbadmin", PWD="mypassword"). I find this more readable, but the 2 are exactly equivalent. – Ascending

This post references some common odbc/vertica error messages and root causes, it might help as I find weird that using DRIVER does not work. – Ascending

@Ascending the link is dead unfortunately. – Hansom

@Hansom I cannot update the old comment but here is the live link: thisdataguy.com/2014/04/29/… – Ascending