Haskell, HDBC, ODBC, MySQL and Mac OS X - macos

Question

I'm trying to use Haskell (version 6.10.3) and HDBC to connect to a MySQL Database. I've chosen to do it with Haskell ODBC. I've used cabal to install HDBC (2.1.1) and HDBC-ODBC (2.1.0.0). I've downloaded and installed the MySQL ODBC driver (5.1.5). I used macports to install unixODBC (2.2.14_1). All of this on top of Mac OS X (10.5.8).
I've mostly been using the instructions on this page http://en.wikibooks.org/wiki/Haskell/Database. At around this point:
"# Add the mysql driver to odbcinst.ini file (under $ODBC_HOME/etc/) and your data source in $HOME/.odbc.ini."
It looks like the macports version of unixODBC installs everything under /opt/local/. I've put an odbcinst.ini into /opt/local/etc/ and I've created a .odbc.ini in my home directory which looks something like this (note that I've experimented with UID vs. USERNAME and PWD vs PASSWORD):
[ODBC Data Sources]
myodbc = MySQL ODBC 5.1 Driver
[ODBC]
Trace = 0
TraceAutoStop = 0
TraceFile =
TraceLibrary =
[myodbc]
Driver = /usr/local/lib/libmyodbc5.so
DATABASE = [hidden]
DESCRIPTION = [hidden]
SERVER = localhost
PORT = 3306
UID = [hidden]
PWD = [hidden]
PASSWORD = [hidden]
USER = [hidden]
And I've written and compiled this Haskell Program:
import Database.HDBC.ODBC
import Database.HDBC
import System
main = do
args <- getArgs
c <- connectODBC (args!!0)
tables <- getTables c
mapM_ putStrLn $ tables
When I try a DSN of "DSN=myodbc" it errors out with:
Database: SqlError
{seState = "[\"HY000\"]",
seNativeError = -1,
seErrorMsg = "connectODBC/sqlDriverConnect:
[\"1045: [unixODBC][MySQL][ODBC 5.1 Driver]Access
denied for user 'jamie'#'localhost' (using password: YES)\"]"}
However, when I try a DSN of "DSN=myodbc;UID=[hidden];PWD=[hidden]", it lists all the tables in the database.

Answer 1

This may be a unixODBC problem rather than a Haskell / HDBC / HDBC-ODBC problem. Running "isql myodbc" results in a "Bus Error". Running "isql -v myodbc" doesn't give any more information. Running isql [uid] [pwd] connects just fine.

Answer 2

iODBC, maintained and supported by my employer, has shipped as part of Mac OS X since Jaguar (10.2.x).
You'll be better off updating iODBC with all the latest patches (Apple tends to be a bit behind on these), than shifting to UnixODBC.
It's generally best to keep all your ODBC configuration in the default file locations for Mac OS X --
/Library/ODBC/odbc.ini
/Library/ODBC/odbcinst.ini
/Users/*/Library/ODBC/odbc.ini
/Users/*/Library/ODBC/odbcinst.ini
You can create symlinks from anywhere else you may want to have these files, e.g. --
ln -s ~/Library/ODBC/odbc.ini ~/.odbc.ini
Last, you may benefit from testing with a commercial ODBC driver for MySQL, such as one of my employer's offerings (two week free trial provided as part of download).