X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FDBIx%2FClass%2FStorage%2FDBI.pm;h=9fbcc97aae5773eb68475e8339e1bf0a98336102;hb=c9c9297bde6db8d9bc299bbbf12d3480943257cd;hp=2cfaca47506e14a8069ba58f563dc69f647a26b8;hpb=1f4263ebe497f0a4a7dbde8850a8d1736946740d;p=dbsrgits%2FDBIx-Class.git diff --git a/lib/DBIx/Class/Storage/DBI.pm b/lib/DBIx/Class/Storage/DBI.pm index 2cfaca4..9fbcc97 100644 --- a/lib/DBIx/Class/Storage/DBI.pm +++ b/lib/DBIx/Class/Storage/DBI.pm @@ -13,6 +13,12 @@ use DBIx::Class::Storage::DBI::Cursor; use DBIx::Class::Storage::Statistics; use Scalar::Util(); use List::Util(); +use Data::Dumper::Concise(); + +# what version of sqlt do we require if deploy() without a ddl_dir is invoked +# when changing also adjust the corresponding author_require in Makefile.PL +my $minimum_sqlt_version = '0.11002'; + __PACKAGE__->mk_group_accessors('simple' => qw/_connect_info _dbi_connect_info _dbh _sql_maker _sql_maker_opts _conn_pid @@ -35,6 +41,38 @@ __PACKAGE__->mk_group_accessors('inherited' => qw/sql_maker_class/); __PACKAGE__->sql_maker_class('DBIx::Class::SQLAHacks'); +# Each of these methods need _determine_driver called before itself +# in order to function reliably. This is a purely DRY optimization +my @rdbms_specific_methods = qw/ + sqlt_type + build_datetime_parser + datetime_parser_type + + insert + insert_bulk + update + delete + select + select_single +/; + +for my $meth (@rdbms_specific_methods) { + + my $orig = __PACKAGE__->can ($meth) + or next; + + no strict qw/refs/; + no warnings qw/redefine/; + *{__PACKAGE__ ."::$meth"} = sub { + if (not $_[0]->_driver_determined) { + $_[0]->_determine_driver; + goto $_[0]->can($meth); + } + $orig->(@_); + }; +} + + =head1 NAME DBIx::Class::Storage::DBI - DBI storage handler @@ -44,7 +82,14 @@ DBIx::Class::Storage::DBI - DBI storage handler my $schema = MySchema->connect('dbi:SQLite:my.db'); $schema->storage->debug(1); - $schema->dbh_do("DROP TABLE authors"); + + my @stuff = $schema->storage->dbh_do( + sub { + my ($storage, $dbh, @args) = @_; + $dbh->do("DROP TABLE authors"); + }, + @column_list + ); $schema->resultset('Book')->search({ written_on => $schema->storage->datetime_parser(DateTime->now) @@ -112,6 +157,12 @@ mixed together: %extra_attributes, }]; + $connect_info_args = [{ + dbh_maker => sub { DBI->connect (...) }, + %dbi_attributes, + %extra_attributes, + }]; + This is particularly useful for L based applications, allowing the following config (L style): @@ -125,6 +176,10 @@ following config (L style): +The C/C/C combination can be substituted by the +C key whose value is a coderef that returns a connected +L + =back Please note that the L docs recommend that you always explicitly @@ -337,6 +392,12 @@ L # Connect via subref ->connect_info([ sub { DBI->connect(...) } ]); + # Connect via subref in hashref + ->connect_info([{ + dbh_maker => sub { DBI->connect(...) }, + on_connect_do => 'alter session ...', + }]); + # A bit more complicated ->connect_info( [ @@ -407,8 +468,21 @@ sub connect_info { elsif (ref $args[0] eq 'HASH') { # single hashref (i.e. Catalyst config) %attrs = %{$args[0]}; @args = (); - for (qw/password user dsn/) { - unshift @args, delete $attrs{$_}; + if (my $code = delete $attrs{dbh_maker}) { + @args = $code; + + my @ignored = grep { delete $attrs{$_} } (qw/dsn user password/); + if (@ignored) { + carp sprintf ( + 'Attribute(s) %s in connect_info were ignored, as they can not be applied ' + . "to the result of 'dbh_maker'", + + join (', ', map { "'$_'" } (@ignored) ), + ); + } + } + else { + @args = delete @attrs{qw/dsn user password/}; } } else { # otherwise assume dsn/user/password + \%attrs + \%extra_attrs @@ -437,12 +511,28 @@ sub connect_info { } } - %attrs = () if (ref $args[0] eq 'CODE'); # _connect() never looks past $args[0] in this case + if (ref $args[0] eq 'CODE') { + # _connect() never looks past $args[0] in this case + %attrs = () + } else { + %attrs = ( + %{ $self->_default_dbi_connect_attributes || {} }, + %attrs, + ); + } $self->_dbi_connect_info([@args, keys %attrs ? \%attrs : ()]); $self->_connect_info; } +sub _default_dbi_connect_attributes { + return { + AutoCommit => 1, + RaiseError => 1, + PrintError => 0, + }; +} + =head2 on_connect_do This method is deprecated in favour of setting via L. @@ -511,7 +601,7 @@ sub dbh_do { my $self = shift; my $code = shift; - my $dbh = $self->_dbh; + my $dbh = $self->_get_dbh; return $self->$code($dbh, @_) if $self->{_in_dbh_do} || $self->{transaction_depth}; @@ -522,11 +612,6 @@ sub dbh_do { my $want_array = wantarray; eval { - $self->_verify_pid if $dbh; - if(!$self->_dbh) { - $self->_populate_dbh; - $dbh = $self->_dbh; - } if($want_array) { @result = $self->$code($dbh, @_); @@ -539,6 +624,7 @@ sub dbh_do { } }; + # ->connected might unset $@ - copy my $exception = $@; if(!$exception) { return $want_array ? @result : $result[0] } @@ -546,6 +632,8 @@ sub dbh_do { # We were not connected - reconnect and retry, but let any # exception fall right through this time + carp "Retrying $code after catching disconnected exception: $exception" + if $ENV{DBIC_DBIRETRY_DEBUG}; $self->_populate_dbh; $self->$code($self->_dbh, @_); } @@ -570,8 +658,7 @@ sub txn_do { my $tried = 0; while(1) { eval { - $self->_verify_pid if $self->_dbh; - $self->_populate_dbh if !$self->_dbh; + $self->_get_dbh; $self->txn_begin; if($want_array) { @@ -586,10 +673,11 @@ sub txn_do { $self->txn_commit; }; + # ->connected might unset $@ - copy my $exception = $@; if(!$exception) { return $want_array ? @result : $result[0] } - if($tried++ > 0 || $self->connected) { + if($tried++ || $self->connected) { eval { $self->txn_rollback }; my $rollback_exception = $@; if($rollback_exception) { @@ -607,6 +695,8 @@ sub txn_do { # We were not connected, and was first try - reconnect and retry # via the while loop + carp "Retrying $coderef after catching disconnected exception: $exception" + if $ENV{DBIC_DBIRETRY_DEBUG}; $self->_populate_dbh; } } @@ -621,7 +711,7 @@ database is not in C mode. sub disconnect { my ($self) = @_; - if( $self->connected ) { + if( $self->_dbh ) { my @actions; push @actions, ( $self->on_disconnect_call || () ); @@ -655,27 +745,52 @@ in MySQL's case disabled entirely. # Storage subclasses should override this sub with_deferred_fk_checks { my ($self, $sub) = @_; - $sub->(); } +=head2 connected + +=over + +=item Arguments: none + +=item Return Value: 1|0 + +=back + +Verifies that the the current database handle is active and ready to execute +an SQL statement (i.e. the connection did not get stale, server is still +answering, etc.) This method is used internally by L. + +=cut + sub connected { - my ($self) = @_; + my $self = shift; + return 0 unless $self->_seems_connected; - if(my $dbh = $self->_dbh) { - if(defined $self->_conn_tid && $self->_conn_tid != threads->tid) { - $self->_dbh(undef); - $self->{_dbh_gen}++; - return; - } - else { - $self->_verify_pid; - return 0 if !$self->_dbh; - } - return ($dbh->FETCH('Active') && $self->_ping); + #be on the safe side + local $self->_dbh->{RaiseError} = 1; + + return $self->_ping; +} + +sub _seems_connected { + my $self = shift; + + my $dbh = $self->_dbh + or return 0; + + if(defined $self->_conn_tid && $self->_conn_tid != threads->tid) { + $self->_dbh(undef); + $self->{_dbh_gen}++; + return 0; + } + else { + $self->_verify_pid; + return 0 if !$self->_dbh; } - return 0; + return $dbh->FETCH('Active'); } sub _ping { @@ -710,21 +825,42 @@ sub ensure_connected { =head2 dbh -Returns the dbh - a data base handle of class L. +Returns a C<$dbh> - a data base handle of class L. The returned handle +is guaranteed to be healthy by implicitly calling L, and if +necessary performing a reconnection before returning. Keep in mind that this +is very B on some database engines. Consider using L +instead. =cut sub dbh { my ($self) = @_; - $self->ensure_connected; + if (not $self->_dbh) { + $self->_populate_dbh; + } else { + $self->ensure_connected; + } + return $self->_dbh; +} + +# this is the internal "get dbh or connect (don't check)" method +sub _get_dbh { + my $self = shift; + $self->_verify_pid if $self->_dbh; + $self->_populate_dbh unless $self->_dbh; return $self->_dbh; } sub _sql_maker_args { my ($self) = @_; - return ( bindtype=>'columns', array_datatypes => 1, limit_dialect => $self->dbh, %{$self->_sql_maker_opts} ); + return ( + bindtype=>'columns', + array_datatypes => 1, + limit_dialect => $self->_get_dbh, + %{$self->_sql_maker_opts} + ); } sub sql_maker { @@ -737,11 +873,15 @@ sub sql_maker { return $self->_sql_maker; } +# nothing to do by default sub _rebless {} +sub _init {} sub _populate_dbh { my ($self) = @_; + my @info = @{$self->_dbi_connect_info || []}; + $self->_dbh(undef); # in case ->connected failed we might get sent here $self->_dbh($self->_connect(@info)); $self->_conn_pid($$); @@ -753,6 +893,11 @@ sub _populate_dbh { # there is no transaction in progress by definition $self->{transaction_depth} = $self->_dbh_autocommit ? 0 : 1; + $self->_run_connection_actions unless $self->{_in_determine_driver}; +} + +sub _run_connection_actions { + my $self = shift; my @actions; push @actions, ( $self->on_connect_call || () ); @@ -764,16 +909,27 @@ sub _populate_dbh { sub _determine_driver { my ($self) = @_; - if (not $self->_driver_determined) { + if ((not $self->_driver_determined) && (not $self->{_in_determine_driver})) { + my $started_connected = 0; + local $self->{_in_determine_driver} = 1; + if (ref($self) eq __PACKAGE__) { my $driver; - if ($self->_dbh) { # we are connected $driver = $self->_dbh->{Driver}{Name}; + $started_connected = 1; } else { - # try to use dsn to not require being connected, the driver may still - # force a connection in _rebless to determine version - ($driver) = $self->_dbi_connect_info->[0] =~ /dbi:([^:]+):/i; + # if connect_info is a CODEREF, we have no choice but to connect + if (ref $self->_dbi_connect_info->[0] && + Scalar::Util::reftype($self->_dbi_connect_info->[0]) eq 'CODE') { + $self->_populate_dbh; + $driver = $self->_dbh->{Driver}{Name}; + } + else { + # try to use dsn to not require being connected, the driver may still + # force a connection in _rebless to determine version + ($driver) = $self->_dbi_connect_info->[0] =~ /dbi:([^:]+):/i; + } } my $storage_class = "DBIx::Class::Storage::DBI::${driver}"; @@ -785,6 +941,11 @@ sub _determine_driver { } $self->_driver_determined(1); + + $self->_init; # run driver-specific initializations + + $self->_run_connection_actions + if !$started_connected && defined $self->_dbh; } } @@ -842,7 +1003,7 @@ sub _do_query { my @bind = map { [ undef, $_ ] } @do_args; $self->_query_start($sql, @bind); - $self->_dbh->do($sql, $attrs, @do_args); + $self->_get_dbh->do($sql, $attrs, @do_args); $self->_query_end($sql, @bind); } @@ -878,6 +1039,8 @@ sub _connect { $weak_self->throw_exception("DBI Exception: $_[0]"); } else { + # the handler may be invoked by something totally out of + # the scope of DBIC croak ("DBI Exception: $_[0]"); } }; @@ -984,15 +1147,12 @@ sub _svp_generate_name { sub txn_begin { my $self = shift; - $self->ensure_connected(); if($self->{transaction_depth} == 0) { $self->debugobj->txn_begin() if $self->debug; - # this isn't ->_dbh-> because - # we should reconnect on begin_work - # for AutoCommit users $self->_dbh_begin_work; - } elsif ($self->auto_savepoint) { + } + elsif ($self->auto_savepoint) { $self->svp_begin; } $self->{transaction_depth}++; @@ -1000,13 +1160,22 @@ sub txn_begin { sub _dbh_begin_work { my $self = shift; - $self->dbh->begin_work; + + # if the user is utilizing txn_do - good for him, otherwise we need to + # ensure that the $dbh is healthy on BEGIN. + # We do this via ->dbh_do instead of ->dbh, so that the ->dbh "ping" + # will be replaced by a failure of begin_work itself (which will be + # then retried on reconnect) + if ($self->{_in_dbh_do}) { + $self->_dbh->begin_work; + } else { + $self->dbh_do(sub { $_[1]->begin_work }); + } } sub txn_commit { my $self = shift; if ($self->{transaction_depth} == 1) { - my $dbh = $self->_dbh; $self->debugobj->txn_commit() if ($self->debug); $self->_dbh_commit; @@ -1022,7 +1191,9 @@ sub txn_commit { sub _dbh_commit { my $self = shift; - $self->_dbh->commit; + my $dbh = $self->_dbh + or $self->throw_exception('cannot COMMIT on a disconnected handle'); + $dbh->commit; } sub txn_rollback { @@ -1059,7 +1230,9 @@ sub txn_rollback { sub _dbh_rollback { my $self = shift; - $self->_dbh->rollback; + my $dbh = $self->_dbh + or $self->throw_exception('cannot ROLLBACK on a disconnected handle'); + $dbh->rollback; } # This used to be the top-half of _execute. It was split out to make it @@ -1156,18 +1329,12 @@ sub _dbh_execute { sub _execute { my $self = shift; - $self->dbh_do('_dbh_execute', @_) + $self->dbh_do('_dbh_execute', @_); # retry over disconnects } sub insert { my ($self, $source, $to_insert) = @_; -# redispatch to insert method of storage we reblessed into, if necessary - if (not $self->_driver_determined) { - $self->_determine_driver; - goto $self->can('insert'); - } - my $ident = $source->from; my $bind_attributes = $self->source_bind_attributes($source); @@ -1178,7 +1345,11 @@ sub insert { my $col_info = $source->column_info($col); if ( $col_info->{auto_nextval} ) { - $updated_cols->{$col} = $to_insert->{$col} = $self->_sequence_fetch( 'nextval', $col_info->{sequence} || $self->_dbh_get_autoinc_seq($self->dbh, $source) ); + $updated_cols->{$col} = $to_insert->{$col} = $self->_sequence_fetch( + 'nextval', + $col_info->{sequence} || + $self->_dbh_get_autoinc_seq($self->_get_dbh, $source) + ); } } } @@ -1194,15 +1365,103 @@ sub insert { ## only prepped once. sub insert_bulk { my ($self, $source, $cols, $data) = @_; + my %colvalues; - my $table = $source->from; @colvalues{@$cols} = (0..$#$cols); - my ($sql, @bind) = $self->sql_maker->insert($table, \%colvalues); - $self->_query_start( $sql, @bind ); + for my $i (0..$#$cols) { + my $first_val = $data->[0][$i]; + next unless ref $first_val eq 'SCALAR'; + + $colvalues{ $cols->[$i] } = $first_val; + } + + # check for bad data and stringify stringifiable objects + my $bad_slice = sub { + my ($msg, $col_idx, $slice_idx) = @_; + $self->throw_exception(sprintf "%s for column '%s' in populate slice:\n%s", + $msg, + $cols->[$col_idx], + do { + local $Data::Dumper::Maxdepth = 1; # don't dump objects, if any + Data::Dumper::Concise::Dumper({ + map { $cols->[$_] => $data->[$slice_idx][$_] } (0 .. $#$cols) + }), + } + ); + }; + + for my $datum_idx (0..$#$data) { + my $datum = $data->[$datum_idx]; + + for my $col_idx (0..$#$cols) { + my $val = $datum->[$col_idx]; + my $sqla_bind = $colvalues{ $cols->[$col_idx] }; + my $is_literal_sql = (ref $sqla_bind) eq 'SCALAR'; + + if ($is_literal_sql) { + if (not ref $val) { + $bad_slice->('bind found where literal SQL expected', $col_idx, $datum_idx); + } + elsif ((my $reftype = ref $val) ne 'SCALAR') { + $bad_slice->("$reftype reference found where literal SQL expected", + $col_idx, $datum_idx); + } + elsif ($$val ne $$sqla_bind){ + $bad_slice->("inconsistent literal SQL value, expecting: '$$sqla_bind'", + $col_idx, $datum_idx); + } + } + elsif (my $reftype = ref $val) { + require overload; + if (overload::Method($val, '""')) { + $datum->[$col_idx] = "".$val; + } + else { + $bad_slice->("$reftype reference found where bind expected", + $col_idx, $datum_idx); + } + } + } + } + + my ($sql, $bind) = $self->_prep_for_execute ( + 'insert', undef, $source, [\%colvalues] + ); + my @bind = @$bind; + + my $empty_bind = 1 if (not @bind) && + (grep { ref $_ eq 'SCALAR' } values %colvalues) == @$cols; + + if ((not @bind) && (not $empty_bind)) { + $self->throw_exception( + 'Cannot insert_bulk without support for placeholders' + ); + } + + $self->_query_start( $sql, ['__BULK__'] ); my $sth = $self->sth($sql); -# @bind = map { ref $_ ? ''.$_ : $_ } @bind; # stringify args + my $rv = do { + if ($empty_bind) { + # bind_param_array doesn't work if there are no binds + $self->_dbh_execute_inserts_with_no_binds( $sth, scalar @$data ); + } + else { +# @bind = map { ref $_ ? ''.$_ : $_ } @bind; # stringify args + $self->_execute_array( $source, $sth, \@bind, $cols, $data ); + } + }; + + $self->_query_end( $sql, ['__BULK__'] ); + + return (wantarray ? ($rv, $sth, @bind) : $rv); +} + +sub _execute_array { + my ($self, $source, $sth, $bind, $cols, $data, @extra) = @_; + + my $guard = $self->txn_scope_guard unless $self->{transaction_depth} != 0; ## This must be an arrayref, else nothing works! my $tuple_status = []; @@ -1213,7 +1472,7 @@ sub insert_bulk { ## Bind the values and execute my $placeholder_index = 1; - foreach my $bound (@bind) { + foreach my $bound (@$bind) { my $attributes = {}; my ($column_name, $data_index) = @$bound; @@ -1228,49 +1487,82 @@ sub insert_bulk { $sth->bind_param_array( $placeholder_index, [@data], $attributes ); $placeholder_index++; } - my $rv = eval { $sth->execute_array({ArrayTupleStatus => $tuple_status}) }; - if (my $err = $@) { + + my $rv = eval { + $self->_dbh_execute_array($sth, $tuple_status, @extra); + }; + my $err = $@ || $sth->errstr; + +# Statement must finish even if there was an exception. + eval { $sth->finish }; + $err = $@ unless $err; + + if ($err) { my $i = 0; ++$i while $i <= $#$tuple_status && !ref $tuple_status->[$i]; - $self->throw_exception($sth->errstr || "Unexpected populate error: $err") + $self->throw_exception("Unexpected populate error: $err") if ($i > $#$tuple_status); - require Data::Dumper; - local $Data::Dumper::Terse = 1; - local $Data::Dumper::Indent = 1; - local $Data::Dumper::Useqq = 1; - local $Data::Dumper::Quotekeys = 0; - $self->throw_exception(sprintf "%s for populate slice:\n%s", - $tuple_status->[$i][1], - Data::Dumper::Dumper( - { map { $cols->[$_] => $data->[$i][$_] } (0 .. $#$cols) } - ), + ($tuple_status->[$i][1] || $err), + Data::Dumper::Concise::Dumper({ + map { $cols->[$_] => $data->[$i][$_] } (0 .. $#$cols) + }), ); } - $self->throw_exception($sth->errstr) if !$rv; - $self->_query_end( $sql, @bind ); - return (wantarray ? ($rv, $sth, @bind) : $rv); + $guard->commit if $guard; + + return $rv; +} + +sub _dbh_execute_array { + my ($self, $sth, $tuple_status, @extra) = @_; + + return $sth->execute_array({ArrayTupleStatus => $tuple_status}); +} + +sub _dbh_execute_inserts_with_no_binds { + my ($self, $sth, $count) = @_; + + my $guard = $self->txn_scope_guard unless $self->{transaction_depth} != 0; + + eval { + my $dbh = $self->_get_dbh; + local $dbh->{RaiseError} = 1; + local $dbh->{PrintError} = 0; + + $sth->execute foreach 1..$count; + }; + my $exception = $@; + +# Make sure statement is finished even if there was an exception. + eval { $sth->finish }; + $exception = $@ unless $exception; + + $self->throw_exception($exception) if $exception; + + $guard->commit if $guard; + + return $count; } sub update { - my $self = shift @_; - my $source = shift @_; + my ($self, $source, @args) = @_; + my $bind_attributes = $self->source_bind_attributes($source); - return $self->_execute('update' => [], $source, $bind_attributes, @_); + return $self->_execute('update' => [], $source, $bind_attributes, @args); } sub delete { - my $self = shift @_; - my $source = shift @_; + my ($self, $source, @args) = @_; my $bind_attrs = $self->source_bind_attributes($source); - return $self->_execute('delete' => [], $source, $bind_attrs, @_); + return $self->_execute('delete' => [], $source, $bind_attrs, @args); } # We were sent here because the $rs contains a complex search @@ -1502,179 +1794,224 @@ sub _select_args { sub _adjust_select_args_for_complex_prefetch { my ($self, $from, $select, $where, $attrs) = @_; + $self->throw_exception ('Nothing to prefetch... how did we get here?!') + if not @{$attrs->{_prefetch_select}}; + $self->throw_exception ('Complex prefetches are not supported on resultsets with a custom from attribute') - if (ref $from ne 'ARRAY'); + if (ref $from ne 'ARRAY' || ref $from->[0] ne 'HASH' || ref $from->[1] ne 'ARRAY'); - # copies for mangling - $from = [ @$from ]; - $select = [ @$select ]; - $attrs = { %$attrs }; - # separate attributes - my $sub_attrs = { %$attrs }; - delete $attrs->{$_} for qw/where bind rows offset group_by having/; - delete $sub_attrs->{$_} for qw/for collapse _prefetch_select _collapse_order_by select as/; + # generate inner/outer attribute lists, remove stuff that doesn't apply + my $outer_attrs = { %$attrs }; + delete $outer_attrs->{$_} for qw/where bind rows offset group_by having/; - my $select_root_alias = $attrs->{alias}; - my $sql_maker = $self->sql_maker; + my $inner_attrs = { %$attrs }; + delete $inner_attrs->{$_} for qw/for collapse _prefetch_select _collapse_order_by select as/; - # create subquery select list - consider only stuff *not* brought in by the prefetch - my $sub_select = []; - my $sub_group_by; - for my $i (0 .. @{$attrs->{select}} - @{$attrs->{_prefetch_select}} - 1) { - my $sel = $attrs->{select}[$i]; - - # alias any functions to the dbic-side 'as' label - # adjust the outer select accordingly - if (ref $sel eq 'HASH' && !$sel->{-select}) { - $sel = { -select => $sel, -as => $attrs->{as}[$i] }; - $select->[$i] = join ('.', $attrs->{alias}, ($attrs->{as}[$i] || "select_$i") ); - } - - push @$sub_select, $sel; - } # bring over all non-collapse-induced order_by into the inner query (if any) # the outer one will have to keep them all - delete $sub_attrs->{order_by}; - if (my $ord_cnt = @{$attrs->{order_by}} - @{$attrs->{_collapse_order_by}} ) { - $sub_attrs->{order_by} = [ - @{$attrs->{order_by}}[ 0 .. $ord_cnt - 1] + delete $inner_attrs->{order_by}; + if (my $ord_cnt = @{$outer_attrs->{order_by}} - @{$outer_attrs->{_collapse_order_by}} ) { + $inner_attrs->{order_by} = [ + @{$outer_attrs->{order_by}}[ 0 .. $ord_cnt - 1] ]; } - # mangle {from}, keep in mind that $from is "headless" from here on - my $join_root = shift @$from; - my %inner_joins; - my %join_info = map { $_->[0]{-alias} => $_->[0] } (@$from); + # generate the inner/outer select lists + # for inside we consider only stuff *not* brought in by the prefetch + # on the outside we substitute any function for its alias + my $outer_select = [ @$select ]; + my $inner_select = []; + for my $i (0 .. ( @$outer_select - @{$outer_attrs->{_prefetch_select}} - 1) ) { + my $sel = $outer_select->[$i]; - # in complex search_related chains $select_root_alias may *not* be - # 'me' so always include it in the inner join - $inner_joins{$select_root_alias} = 1 if ($join_root->{-alias} ne $select_root_alias); + if (ref $sel eq 'HASH' ) { + $sel->{-as} ||= $attrs->{as}[$i]; + $outer_select->[$i] = join ('.', $attrs->{alias}, ($sel->{-as} || "inner_column_$i") ); + } + push @$inner_select, $sel; + } - # decide which parts of the join will remain on the inside - # - # this is not a very viable optimisation, but it was written - # before I realised this, so might as well remain. We can throw - # away _any_ branches of the join tree that are: - # 1) not mentioned in the condition/order - # 2) left-join leaves (or left-join leaf chains) - # Most of the join conditions will not satisfy this, but for real - # complex queries some might, and we might make some RDBMS happy. - # - # - # since we do not have introspectable SQLA, we fall back to ugly - # scanning of raw SQL for WHERE, and for pieces of ORDER BY - # in order to determine what goes into %inner_joins + # normalize a copy of $from, so it will be easier to work with further + # down (i.e. promote the initial hashref to an AoH) + $from = [ @$from ]; + $from->[0] = [ $from->[0] ]; + my %original_join_info = map { $_->[0]{-alias} => $_->[0] } (@$from); + + + # decide which parts of the join will remain in either part of + # the outer/inner query + + # First we compose a list of which aliases are used in restrictions + # (i.e. conditions/order/grouping/etc). Since we do not have + # introspectable SQLA, we fall back to ugly scanning of raw SQL for + # WHERE, and for pieces of ORDER BY in order to determine which aliases + # need to appear in the resulting sql. # It may not be very efficient, but it's a reasonable stop-gap + # Also unqualified column names will not be considered, but more often + # than not this is actually ok + # + # In the same loop we enumerate part of the selection aliases, as + # it requires the same sqla hack for the time being + my ($restrict_aliases, $select_aliases, $prefetch_aliases); { # produce stuff unquoted, so it can be scanned + my $sql_maker = $self->sql_maker; local $sql_maker->{quote_char}; my $sep = $self->_sql_maker_opts->{name_sep} || '.'; $sep = "\Q$sep\E"; - my @order_by = (map + my $non_prefetch_select_sql = $sql_maker->_recurse_fields ($inner_select); + my $prefetch_select_sql = $sql_maker->_recurse_fields ($outer_attrs->{_prefetch_select}); + my $where_sql = $sql_maker->where ($where); + my $group_by_sql = $sql_maker->_order_by({ + map { $_ => $inner_attrs->{$_} } qw/group_by having/ + }); + my @non_prefetch_order_by_chunks = (map { ref $_ ? $_->[0] : $_ } - $sql_maker->_order_by_chunks ($sub_attrs->{order_by}) + $sql_maker->_order_by_chunks ($inner_attrs->{order_by}) ); - my $where_sql = $sql_maker->where ($where); - my $select_sql = $sql_maker->_recurse_fields ($sub_select); - # sort needed joins - for my $alias (keys %join_info) { + for my $alias (keys %original_join_info) { + my $seen_re = qr/\b $alias $sep/x; - # any table alias found on a column name in where or order_by - # gets included in %inner_joins - # Also any parent joins that are needed to reach this particular alias - for my $piece ($select_sql, $where_sql, @order_by ) { - if ($piece =~ /\b $alias $sep/x) { - $inner_joins{$alias} = 1; + for my $piece ($where_sql, $group_by_sql, @non_prefetch_order_by_chunks ) { + if ($piece =~ $seen_re) { + $restrict_aliases->{$alias} = 1; } } + + if ($non_prefetch_select_sql =~ $seen_re) { + $select_aliases->{$alias} = 1; + } + + if ($prefetch_select_sql =~ $seen_re) { + $prefetch_aliases->{$alias} = 1; + } + } } - # scan for non-leaf/non-left joins and mark as needed - # also mark all ancestor joins that are needed to reach this particular alias - # (e.g. join => { cds => 'tracks' } - tracks will bring cds too ) - # - # traverse by the size of the -join_path i.e. reverse depth first - for my $alias (sort { @{$join_info{$b}{-join_path}} <=> @{$join_info{$a}{-join_path}} } (keys %join_info) ) { - - my $j = $join_info{$alias}; - $inner_joins{$alias} = 1 if (! $j->{-join_type} || ($j->{-join_type} !~ /^left$/i) ); + # Add any non-left joins to the restriction list (such joins are indeed restrictions) + for my $j (values %original_join_info) { + my $alias = $j->{-alias} or next; + $restrict_aliases->{$alias} = 1 if ( + (not $j->{-join_type}) + or + ($j->{-join_type} !~ /^left (?: \s+ outer)? $/xi) + ); + } - if ($inner_joins{$alias}) { - $inner_joins{$_} = 1 for (@{$j->{-join_path}}); + # mark all join parents as mentioned + # (e.g. join => { cds => 'tracks' } - tracks will need to bring cds too ) + for my $collection ($restrict_aliases, $select_aliases) { + for my $alias (keys %$collection) { + $collection->{$_} = 1 + for (@{ $original_join_info{$alias}{-join_path} || [] }); } } # construct the inner $from for the subquery - my $inner_from = [ $join_root ]; + my %inner_joins = (map { %{$_ || {}} } ($restrict_aliases, $select_aliases) ); + my @inner_from; for my $j (@$from) { - push @$inner_from, $j if $inner_joins{$j->[0]{-alias}}; + push @inner_from, $j if $inner_joins{$j->[0]{-alias}}; } # if a multi-type join was needed in the subquery ("multi" is indicated by # presence in {collapse}) - add a group_by to simulate the collapse in the subq - unless ($sub_attrs->{group_by}) { + unless ($inner_attrs->{group_by}) { for my $alias (keys %inner_joins) { # the dot comes from some weirdness in collapse # remove after the rewrite if ($attrs->{collapse}{".$alias"}) { - $sub_attrs->{group_by} ||= $sub_select; + $inner_attrs->{group_by} ||= $inner_select; last; } } } + # demote the inner_from head + $inner_from[0] = $inner_from[0][0]; + # generate the subquery my $subq = $self->_select_args_to_query ( - $inner_from, - $sub_select, + \@inner_from, + $inner_select, $where, - $sub_attrs + $inner_attrs, ); + my $subq_joinspec = { - -alias => $select_root_alias, - -source_handle => $join_root->{-source_handle}, - $select_root_alias => $subq, + -alias => $attrs->{alias}, + -source_handle => $inner_from[0]{-source_handle}, + $attrs->{alias} => $subq, }; - # Generate a new from (really just replace the join slot with the subquery) - # Before we would start the outer chain from the subquery itself (i.e. - # SELECT ... FROM (SELECT ... ) alias JOIN ..., but this turned out to be - # a bad idea for search_related, as the root of the chain was effectively - # lost (i.e. $artist_rs->search_related ('cds'... ) would result in alias - # of 'cds', which would prevent from doing things like order_by artist.*) - # See t/prefetch/via_search_related.t for a better idea + # Generate the outer from - this is relatively easy (really just replace + # the join slot with the subquery), with a major caveat - we can not + # join anything that is non-selecting (not part of the prefetch), but at + # the same time is a multi-type relationship, as it will explode the result. + # + # There are two possibilities here + # - either the join is non-restricting, in which case we simply throw it away + # - it is part of the restrictions, in which case we need to collapse the outer + # result by tackling yet another group_by to the outside of the query + + # so first generate the outer_from, up to the substitution point my @outer_from; - if ($join_root->{-alias} eq $select_root_alias) { # just swap the root part and we're done - @outer_from = ( - $subq_joinspec, - @$from, - ) - } - else { # this is trickier - @outer_from = ($join_root); - - for my $j (@$from) { - if ($j->[0]{-alias} eq $select_root_alias) { - push @outer_from, [ - $subq_joinspec, - @{$j}[1 .. $#$j], - ]; - } - else { - push @outer_from, $j; - } + while (my $j = shift @$from) { + if ($j->[0]{-alias} eq $attrs->{alias}) { # time to swap + push @outer_from, [ + $subq_joinspec, + @{$j}[1 .. $#$j], + ]; + last; # we'll take care of what's left in $from below + } + else { + push @outer_from, $j; } } + # see what's left - throw away if not selecting/restricting + # also throw in a group_by if restricting to guard against + # cross-join explosions + # + while (my $j = shift @$from) { + my $alias = $j->[0]{-alias}; + + if ($select_aliases->{$alias} || $prefetch_aliases->{$alias}) { + push @outer_from, $j; + } + elsif ($restrict_aliases->{$alias}) { + push @outer_from, $j; + + # FIXME - this should be obviated by SQLA2, as I'll be able to + # have restrict_inner and restrict_outer... or something to that + # effect... I think... + + # FIXME2 - I can't find a clean way to determine if a particular join + # is a multi - instead I am just treating everything as a potential + # explosive join (ribasushi) + # + # if (my $handle = $j->[0]{-source_handle}) { + # my $rsrc = $handle->resolve; + # ... need to bail out of the following if this is not a multi, + # as it will be much easier on the db ... + + $outer_attrs->{group_by} ||= $outer_select; + # } + } + } + + # demote the outer_from head + $outer_from[0] = $outer_from[0][0]; + # This is totally horrific - the $where ends up in both the inner and outer query # Unfortunately not much can be done until SQLA2 introspection arrives, and even # then if where conditions apply to the *right* side of the prefetch, you may have @@ -1682,7 +2019,7 @@ sub _adjust_select_args_for_complex_prefetch { # the outer select to exclude joins you didin't want in the first place # # OTOH it can be seen as a plus: (notes that this query would make a DBA cry ;) - return (\@outer_from, $select, $where, $attrs); + return (\@outer_from, $outer_select, $where, $outer_attrs); } sub _resolve_ident_sources { @@ -1792,7 +2129,6 @@ sub _subq_count_select { return @pcols ? \@pcols : [ 1 ]; } - sub source_bind_attributes { my ($self, $source) = @_; @@ -1867,7 +2203,7 @@ sub _dbh_sth { sub sth { my ($self, $sql) = @_; - $self->dbh_do('_dbh_sth', $sql); + $self->dbh_do('_dbh_sth', $sql); # retry over disconnects } sub _dbh_columns_info_for { @@ -1929,7 +2265,7 @@ sub _dbh_columns_info_for { sub columns_info_for { my ($self, $table) = @_; - $self->dbh_do('_dbh_columns_info_for', $table); + $self->_dbh_columns_info_for ($self->_get_dbh, $table); } =head2 last_insert_id @@ -1955,7 +2291,68 @@ EOE sub last_insert_id { my $self = shift; - $self->dbh_do('_dbh_last_insert_id', @_); + $self->_dbh_last_insert_id ($self->_dbh, @_); +} + +=head2 _native_data_type + +=over 4 + +=item Arguments: $type_name + +=back + +This API is B, will almost definitely change in the future, and +currently only used by L<::AutoCast|DBIx::Class::Storage::DBI::AutoCast> and +L<::Sybase|DBIx::Class::Storage::DBI::Sybase>. + +The default implementation returns C, implement in your Storage driver if +you need this functionality. + +Should map types from other databases to the native RDBMS type, for example +C to C. + +Types with modifiers should map to the underlying data type. For example, +C should become C. + +Composite types should map to the container type, for example +C becomes C. + +=cut + +sub _native_data_type { + #my ($self, $data_type) = @_; + return undef +} + +# Check if placeholders are supported at all +sub _placeholders_supported { + my $self = shift; + my $dbh = $self->_get_dbh; + + # some drivers provide a $dbh attribute (e.g. Sybase and $dbh->{syb_dynamic_supported}) + # but it is inaccurate more often than not + eval { + local $dbh->{PrintError} = 0; + local $dbh->{RaiseError} = 1; + $dbh->do('select ?', {}, 1); + }; + return $@ ? 0 : 1; +} + +# Check if placeholders bound to non-string types throw exceptions +# +sub _typeless_placeholders_supported { + my $self = shift; + my $dbh = $self->_get_dbh; + + eval { + local $dbh->{PrintError} = 0; + local $dbh->{RaiseError} = 1; + # this specifically tests a bind that is NOT a string + $dbh->do('select 1 where 1 = ?', {}, 1); + }; + return $@ ? 0 : 1; } =head2 sqlt_type @@ -1964,7 +2361,9 @@ Returns the database driver name. =cut -sub sqlt_type { shift->dbh->{Driver}->{Name} } +sub sqlt_type { + shift->_get_dbh->{Driver}->{Name}; +} =head2 bind_attribute_by_data_type @@ -2080,9 +2479,8 @@ sub create_ddl_dir { %{$sqltargs || {}} }; - $self->throw_exception(q{Can't create a ddl file without SQL::Translator 0.09003: '} - . $self->_check_sqlt_message . q{'}) - if !$self->_check_sqlt_version; + $self->throw_exception("Can't create a ddl file without SQL::Translator: " . $self->_sqlt_version_error) + if !$self->_sqlt_version_ok; my $sqlt = SQL::Translator->new( $sqltargs ); @@ -2210,8 +2608,6 @@ See L for a list of values for C<$sqlt_args>. sub deployment_statements { my ($self, $schema, $type, $version, $dir, $sqltargs) = @_; - # Need to be connected to get the correct sqlt_type - $self->ensure_connected() unless $type; $type ||= $self->sqlt_type; $version ||= $schema->schema_version || '1.x'; $dir ||= './'; @@ -2226,22 +2622,25 @@ sub deployment_statements { return join('', @rows); } - $self->throw_exception(q{Can't deploy without SQL::Translator 0.09003: '} - . $self->_check_sqlt_message . q{'}) - if !$self->_check_sqlt_version; - - require SQL::Translator::Parser::DBIx::Class; - eval qq{use SQL::Translator::Producer::${type}}; - $self->throw_exception($@) if $@; + $self->throw_exception("Can't deploy without either SQL::Translator or a ddl_dir: " . $self->_sqlt_version_error ) + if !$self->_sqlt_version_ok; # sources needs to be a parser arg, but for simplicty allow at top level # coming in $sqltargs->{parser_args}{sources} = delete $sqltargs->{sources} if exists $sqltargs->{sources}; - my $tr = SQL::Translator->new(%$sqltargs); - SQL::Translator::Parser::DBIx::Class::parse( $tr, $schema ); - return "SQL::Translator::Producer::${type}"->can('produce')->($tr); + my $tr = SQL::Translator->new( + producer => "SQL::Translator::Producer::${type}", + %$sqltargs, + parser => 'SQL::Translator::Parser::DBIx::Class', + data => $schema, + ); + + my $ret = $tr->translate + or $self->throw_exception( 'Unable to produce deployment statements: ' . $tr->error); + + return $ret; } sub deploy { @@ -2256,7 +2655,9 @@ sub deploy { return if $line =~ /^\s+$/; # skip whitespace only $self->_query_start($line); eval { - $self->dbh->do($line); # shouldn't be using ->dbh ? + # do a dbh_do cycle here, as we need some error checking in + # place (even though we will ignore errors) + $self->dbh_do (sub { $_[1]->do($line) }); }; if ($@) { carp qq{$@ (running "${line}")}; @@ -2285,7 +2686,6 @@ Returns the datetime parser class sub datetime_parser { my $self = shift; return $self->{datetime_parser} ||= do { - $self->ensure_connected; $self->build_datetime_parser(@_); }; } @@ -2308,26 +2708,10 @@ See L sub build_datetime_parser { my $self = shift; my $type = $self->datetime_parser_type(@_); - eval "use ${type}"; - $self->throw_exception("Couldn't load ${type}: $@") if $@; + $self->ensure_class_loaded ($type); return $type; } -{ - my $_check_sqlt_version; # private - my $_check_sqlt_message; # private - sub _check_sqlt_version { - return $_check_sqlt_version if defined $_check_sqlt_version; - eval 'use SQL::Translator "0.09003"'; - $_check_sqlt_message = $@ || ''; - $_check_sqlt_version = !$@; - } - - sub _check_sqlt_message { - _check_sqlt_version if !defined $_check_sqlt_message; - $_check_sqlt_message; - } -} =head2 is_replicating @@ -2354,27 +2738,44 @@ sub lag_behind_master { return; } -=head2 order_columns_for_select - -Returns an ordered list of column names for use with a C