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WHERE engine IN (...) AND 'public' IN (settings1, settings2, settings3
+, settings4)

my $engines = join(",",map($dbh->quote($_), @choices));
my $sql = <<EOF;
...
       settings1="public" OR settings2="public" OR settings3="public" 
+OR settings4="public"
  )
EOF

my $qs = join(",",map('?', @choices));
my $sql = <<EOF;
...
  )
EOF
my $rows = $dbh->selectall_arrayref( $sql, {Slice=>{}}, @choices );

use SQL::Abstract;
my $sa = SQL::Abstract->new( logic=>'and' );
...
    ],
);
my $rows = $dbh->selectall_arrayref( $sql, {Slice=>{}}, @bind );