Syntax for attributes when connecting

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I'm connecting to a database using the DBI::ODBC interface. (Specifically,
I'm connecting to a Progress v9.1e running on SuSE Linux using the Merant
ODBC driver).

When opening the database handle, I know that I need to set what Progress
calls the "transaction isolation level", which sets the levels that the
SQL standard refers to as 'dirty read', etc.

And I know that I need to use the SQLSetConnectAttr to do this.

But I have yet to find an example of the syntax to use in the connection
string. Can someone help? I presume it will be something like:

$attribute_ref = { 'RaiseError' => 1,
'SQLSetConnectAttr' => '??????',
};

Many thanks in advance.

Regards, Sam Carmalt
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