If you created (or altered) the table in such a way that the columns in the table are ordered the same as the columns in the input data file, then you can build your insert sql statement like this:
my $sth = $db->prepare( "describe my_big_table" );
$sth->execute;
my $rows = $sth->fetchall_arrayref;
$sth->finish;
my @column_names = map { $$_[0] } @$rows;
my $insert_sql =
join( '',
'insert into my_big_table (',
join( ',', @column_names ),
') values (',
join( ',', ( '?') x scalar @column_names ),
')'
);
# check your work, if you like:
print join( "\n", "=== columns:", @column_names, '=== sql:', $insert_s
+ql, '' );
(updated to anonymize the table name)
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