"I tried, but I got the following error message: ..."

"I tried" doesn't tell us what you tried, so we're somewhat in the dark there; however, perhaps jumping directly to the error message will prove useful. What did you see when you looked at line 1395 of C:/xampp/perl/site/lib/DBIx/Class/Storage/DBI.pm? [Correct me if I'm wrong: you didn't look, did you?] In my copy of that code, I see:

$dbh = DBI->connect(@info);
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Look familiar? Now look at the line just before that (i.e. 1394):

require DBI;
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So, the connection is being made using DBI's connect() method.

One key phrase that stands out:

The $data_source value must begin with "dbi:driver_name:".

Note that's dbi (in lowercase) and single colons are used!

The next paragraph goes on to explain what happens if

the driver_name part is empty (i.e., the $data_source prefix is "dbi::")

I recommend you read more than just those snippets I've pointed to; however, that may be enough for you to resolve your problems.

"I wasted an entire day on this."

Or, alternatively, you could take the silver lining view:

"I spent an entire day that I'll never forget. I learnt valuable lessons about troubleshooting and reading documentation that I'll never forget either."