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=head1 NAME

DBIx::Simple::Comparison - DBIx::Simple in DBI jargon

=head1 DESCRIPTION

This is just a simple and B<inaccurate> overview of what DBI things the
DBIx::Simple things represent, or the other way around.

This document can be useful to find the foo equivalent of bar.

C<?> means that DBI doesn't have an equivalent or that I couldn't find one.

C<=> means that DBIx::Simple provides a direct wrapper to the DBI function.

C<~> means that DBIx::Simple's method does more or less the same, but usually
in a more high level way: context sensitive, combining things, automatically
taking care of something.

Note that DBIx::Simple is a wrapper around DBI. It is not "better" than DBI. In
fact, DBIx::Simple cannot work without DBI.

Using DBI directly is always faster than using DBIx::Simple's equivalents. (For
the computer, that is. For you, DBIx::Simple is supposed to be faster.)

=head2 Classes, common names

 use DBI       ~  use DBIx::Simple

 $DBI::errstr  =  DBIx::Simple->error

 DBI::db       ~  DBIx::Simple
 $dbh          ~  $db
 $dbh->errstr  =  $db->error

 connect       ~  connect
 connect       ~  new

 DBI::st       ~  DBIx::Simple::Result
 <undef>       ~  DBIx::Simple::Dummy
 $sth          ~  $result

=head2 Queries

DBI

 my $sth = $dbh->prepare_cached($query);
 $sth->execute(@values);

~ DBIx::Simple

 my $result = $db->query($query, $values);

=head2 Results

 DBI                          DBIx::Simple

 bind_columns              ~  bind

 fetchrow_arrayref/fetch   =  fetch
 fetchrow_array            ~  list
 *1                        ~  flat
 [@{fetchrow_arrayref}]    =  array
 fetchall_arrayref         ~  arrays
 fetchrow_hashref() *2*3   =  hash
 fetchall_arrayref({}) *4  ~  hashes

 fetchall_hashref *2       =  map_hashes
 ?                         ?  map_arrays
 fetchall_hashref(1) *2    =  map

 $sth->{NAME_lc/NAME}      =  $result->columns

*1 There's no fetch variant, but you can do C<< { @{
$dbh->selectcol_arrayref('SELECT ...', { Slice => [] }) } } >>.

*2 To receive the keys (column names) lowercased, use C<<
$db->{FetchHashKeyName} = 'NAME_lc' >>. DBIx::Simple lower cases them by
default.

*3 Or supply an argument, C<'NAME_lc'>.

*4 No, arrayref isn't a typo. When supplied an empty hash reference, DBI's
fetchall_arrayref actually returns hashrefs. This DBI method does not support
lower casing of keys, DBIx::Simple does.

=head2 Direct access

 DBI                 DBIx::Simple

 $dbh             =  $db->dbh
 $sth->{$foo}     =  $result->attr($foo)

 func             =  func

 begin_work       =  begin_work
 commit           =  commit
 rollback         =  rollback
 last_insert_id   =  last_insert_id
 rows             =  rows

 disconnect       ~  disconnect
 finish           ~  finish

=head2 DBIx::Simple specific (?)

 keep_statements
 lc_columns
 iquery (via SQL::Interp)
 select, insert, update, delete (via SQL::Abstract)
 abstract (via SQL::Abstract)
 flat
 hashes
 map_arrays
 map

=head1 AUTHOR

Juerd Waalboer <juerd@cpan.org> <http://juerd.nl/>

=head1 SEE ALSO

L<DBI>, L<DBIx::Simple>

=cut
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