You seem to be having problems both with reading the error message and with basic Perl syntax.

• Single quotes don't interpolate; you would want to use "$foo" instead.
• However even changing the single quotes wouldn't fix your problem since connect wants three distinct arguments, not one.
• The format of your DSN doesn't match what DBI expects as the error message says; you need to read the documentation for the DBD driver for your particular database and find out what format it should take.

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