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```
use strict;
use warnings;
```

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sub open_dbi {
    # Declare and initialize variables
...
    my $dbh = DBI->connect("dbi:ODBC:database=$db;host=$host", $db_use
+r, $db_password, {RaiseError => 0, PrintError => 0} ) or err_trap("Ca
+nnot connect to the database");
    return $dbh;
}