On Unix, you configure DSN entries directly in the odbc.ini file. Here is a typical odbc.ini file that configures myodbc and myodbc3 as the DSN names for MyODBC 2.50 and Connector/ODBC 3.51, respectively:

;
;  odbc.ini configuration for Connector/ODBC and Connector/ODBC 3.51 drivers
;

[ODBC Data Sources]
myodbc      = MyODBC 2.50 Driver DSN
myodbc3     = MyODBC 3.51 Driver DSN

[myodbc]
Driver       = /usr/local/lib/libmyodbc.so
Description  = MyODBC 2.50 Driver DSN
SERVER       = localhost
PORT         =
USER         = root
Password     =
Database     = test
OPTION       = 3
SOCKET       =

[myodbc3]
Driver       = /usr/local/lib/libmyodbc3.so
Description  = Connector/ODBC 3.51 Driver DSN
SERVER       = localhost
PORT         =
USER         = root
Password     =
Database     = test
OPTION       = 3
SOCKET       =

[Default]
Driver       = /usr/local/lib/libmyodbc3.so
Description  = Connector/ODBC 3.51 Driver DSN
SERVER       = localhost
PORT         =
USER         = root
Password     =
Database     = test
OPTION       = 3
SOCKET       =

Refer to the Sección 25.1.3.5, “Connector/ODBC Connection Parameters”, for the list of connection parameters that can be supplied.

Note: If you are using unixODBC, you can use the following tools to set up the DSN:

In some cases when using unixODBC, you might get this error:

Data source name not found and no default driver specified

If this happens, make sure the ODBCINI and ODBCSYSINI environment variables are pointing to the right odbc.ini file. For example, if your odbc.ini file is located in /usr/local/etc, set the environment variables like this:

export ODBCINI=/usr/local/etc/odbc.ini
export ODBCSYSINI=/usr/local/etc