X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FDBIx%2FClass%2FStorage%2FDBI.pm;h=91ea170d3334f58401cbc0a9e9b7f5dd69ad0b1f;hb=d047d650648a9566e84ca994cf699eebaf0cd156;hp=1cbc7ef347a50e215826c6ea3d4bb15cb387acb3;hpb=b355477380a078c7d302357f502a568a230c0db5;p=dbsrgits%2FDBIx-Class.git diff --git a/lib/DBIx/Class/Storage/DBI.pm b/lib/DBIx/Class/Storage/DBI.pm index 1cbc7ef..91ea170 100644 --- a/lib/DBIx/Class/Storage/DBI.pm +++ b/lib/DBIx/Class/Storage/DBI.pm @@ -1,10 +1,12 @@ package DBIx::Class::Storage::DBI; # -*- mode: cperl; cperl-indent-level: 2 -*- +use strict; +use warnings; + use base 'DBIx::Class::Storage'; +use mro 'c3'; -use strict; -use warnings; use Carp::Clan qw/^DBIx::Class/; use DBI; use DBIx::Class::Storage::DBI::Cursor; @@ -13,8 +15,8 @@ use Scalar::Util(); use List::Util(); __PACKAGE__->mk_group_accessors('simple' => - qw/_connect_info _dbi_connect_info _dbh _sql_maker _sql_maker_opts - _conn_pid _conn_tid transaction_depth _dbh_autocommit savepoints/ + qw/_connect_info _dbi_connect_info _dbh _sql_maker _sql_maker_opts _conn_pid + _conn_tid transaction_depth _dbh_autocommit _driver_determined savepoints/ ); # the values for these accessors are picked out (and deleted) from @@ -90,8 +92,8 @@ recognized by DBIx::Class: =item * -A single code reference which returns a connected -L optionally followed by +A single code reference which returns a connected +L optionally followed by L recognized by DBIx::Class: @@ -110,7 +112,7 @@ mixed together: %extra_attributes, }]; -This is particularly useful for L based applications, allowing the +This is particularly useful for L based applications, allowing the following config (L style): @@ -129,7 +131,7 @@ Please note that the L docs recommend that you always explicitly set C to either I<0> or I<1>. L further recommends that it be set to I<1>, and that you perform transactions via our L method. L will set it -to I<1> if you do not do explicitly set it to zero. This is the default +to I<1> if you do not do explicitly set it to zero. This is the default for most DBDs. See L for details. =head3 DBIx::Class specific connection attributes @@ -268,7 +270,7 @@ storage object. If set to a true value, this option will disable the caching of statement handles via L. -=item limit_dialect +=item limit_dialect Sets the limit dialect. This is useful for JDBC-bridge among others where the remote SQL-dialect cannot be determined by the name of the @@ -276,7 +278,7 @@ driver alone. See also L. =item quote_char -Specifies what characters to use to quote table and column names. If +Specifies what characters to use to quote table and column names. If you use this you will want to specify L as well. C expects either a single character, in which case is it @@ -288,8 +290,8 @@ SQL Server you should use C<< quote_char => [qw/[ ]/] >>. =item name_sep -This only needs to be used in conjunction with C, and is used to -specify the charecter that seperates elements (schemas, tables, columns) from +This only needs to be used in conjunction with C, and is used to +specify the charecter that seperates elements (schemas, tables, columns) from each other. In most cases this is simply a C<.>. The consequences of not supplying this value is that L @@ -435,12 +437,28 @@ 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. @@ -537,6 +555,7 @@ sub dbh_do { } }; + # ->connected might unset $@ - copy my $exception = $@; if(!$exception) { return $want_array ? @result : $result[0] } @@ -544,6 +563,8 @@ 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, @_); } @@ -584,10 +605,11 @@ 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) { @@ -605,6 +627,8 @@ 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}; $self->_populate_dbh; } } @@ -619,7 +643,7 @@ database is not in C mode. sub disconnect { my ($self) = @_; - if( $self->connected ) { + if( $self->_dbh ) { my @actions; push @actions, ( $self->on_disconnect_call || () ); @@ -656,23 +680,57 @@ sub with_deferred_fk_checks { $sub->(); } +=head2 connected + +=over + +=item Arguments: none + +=item Return Value: 1|0 + +=back + +Verifies that the the current database handle is active and ready to execute +an SQL statement (i.e. the connection did not get stale, server is still +answering, etc.) This method is used internally by L. + +=cut + sub connected { - my ($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') && $dbh->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 { + my $self = shift; + + my $dbh = $self->_dbh or return 0; + + return $dbh->ping; } # handle pid changes correctly @@ -699,21 +757,41 @@ sub ensure_connected { =head2 dbh -Returns the dbh - a data base handle of class L. +Returns a C<$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->_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 { @@ -730,7 +808,9 @@ sub _rebless {} 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($$); @@ -742,6 +822,11 @@ 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, ( $self->on_connect_call || () ); @@ -753,21 +838,33 @@ sub _populate_dbh { sub _determine_driver { my ($self) = @_; - if (ref $self eq 'DBIx::Class::Storage::DBI') { - my $driver; + if ((not $self->_driver_determined) && (not $self->{_in_determine_driver})) { + my $started_unconnected = 0; + local $self->{_in_determine_driver} = 1; + + if (ref($self) eq __PACKAGE__) { + my $driver; + if ($self->_dbh) { # we are connected + $driver = $self->_dbh->{Driver}{Name}; + } else { + # try to use dsn to not require being connected, the driver may still + # force a connection in _rebless to determine version + ($driver) = $self->_dbi_connect_info->[0] =~ /dbi:([^:]+):/i; + $started_unconnected = 1; + } - if ($self->_dbh) { # we are connected - $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}"; + if ($self->load_optional_class($storage_class)) { + mro::set_mro($storage_class, 'c3'); + bless $self, $storage_class; + $self->_rebless(); + } } - if ($self->load_optional_class("DBIx::Class::Storage::DBI::${driver}")) { - bless $self, "DBIx::Class::Storage::DBI::${driver}"; - $self->_rebless(); - } + $self->_driver_determined(1); + + $self->_run_connection_actions + if $started_unconnected && defined $self->_dbh; } } @@ -891,11 +988,11 @@ sub svp_begin { $self->throw_exception ("Your Storage implementation doesn't support savepoints") unless $self->can('_svp_begin'); - + push @{ $self->{savepoints} }, $name; $self->debugobj->svp_begin($name) if $self->debug; - + return $self->_svp_begin($name); } @@ -955,7 +1052,7 @@ sub svp_rollback { } $self->debugobj->svp_rollback($name) if $self->debug; - + return $self->_svp_rollback($name); } @@ -967,14 +1064,17 @@ 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; + + # being here implies we have AutoCommit => 1 + # if the user is utilizing txn_do - good for + # him, otherwise we need to ensure that the + # $dbh is healthy on BEGIN + my $dbh_method = $self->{_in_dbh_do} ? '_dbh' : 'dbh'; + $self->$dbh_method->begin_work; + } elsif ($self->auto_savepoint) { $self->svp_begin; } @@ -1093,7 +1193,7 @@ sub _dbh_execute { my $sth = $self->sth($sql,$op); - my $placeholder_index = 1; + my $placeholder_index = 1; foreach my $bound (@$bind) { my $attributes = {}; @@ -1130,18 +1230,27 @@ sub _execute { sub insert { my ($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); my $updated_cols = {}; - $self->ensure_connected; foreach my $col ( $source->columns ) { if ( !defined $to_insert->{$col} ) { 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) + ); } } } @@ -1152,7 +1261,7 @@ sub insert { } ## Still not quite perfect, and EXPERIMENTAL -## Currently it is assumed that all values passed will be "normal", i.e. not +## Currently it is assumed that all values passed will be "normal", i.e. not ## scalar refs, or at least, all the same type as the first set, the statement is ## only prepped once. sub insert_bulk { @@ -1161,7 +1270,9 @@ sub insert_bulk { my $table = $source->from; @colvalues{@$cols} = (0..$#$cols); my ($sql, @bind) = $self->sql_maker->insert($table, \%colvalues); - + + $self->_determine_driver; + $self->_query_start( $sql, @bind ); my $sth = $self->sth($sql); @@ -1174,7 +1285,7 @@ sub insert_bulk { my $bind_attributes = $self->source_bind_attributes($source); ## Bind the values and execute - my $placeholder_index = 1; + my $placeholder_index = 1; foreach my $bound (@bind) { @@ -1221,8 +1332,9 @@ sub insert_bulk { sub update { my $self = shift @_; my $source = shift @_; + $self->_determine_driver; my $bind_attributes = $self->source_bind_attributes($source); - + return $self->_execute('update' => [], $source, $bind_attributes, @_); } @@ -1230,9 +1342,9 @@ sub update { sub delete { my $self = shift @_; my $source = shift @_; - + $self->_determine_driver; my $bind_attrs = $self->source_bind_attributes($source); - + return $self->_execute('delete' => [], $source, $bind_attrs, @_); } @@ -1331,10 +1443,10 @@ sub _select { my $self = shift; # localization is neccessary as - # 1) there is no infrastructure to pass this around (easy to do, but will wait) + # 1) there is no infrastructure to pass this around before SQLA2 # 2) _select_args sets it and _prep_for_execute consumes it my $sql_maker = $self->sql_maker; - local $sql_maker->{for}; + local $sql_maker->{_dbic_rs_attrs}; return $self->_execute($self->_select_args(@_)); } @@ -1343,10 +1455,10 @@ sub _select_args_to_query { my $self = shift; # localization is neccessary as - # 1) there is no infrastructure to pass this around (easy to do, but will wait) + # 1) there is no infrastructure to pass this around before SQLA2 # 2) _select_args sets it and _prep_for_execute consumes it my $sql_maker = $self->sql_maker; - local $sql_maker->{for}; + local $sql_maker->{_dbic_rs_attrs}; # my ($op, $bind, $ident, $bind_attrs, $select, $cond, $order, $rows, $offset) # = $self->_select_args($ident, $select, $cond, $attrs); @@ -1366,8 +1478,19 @@ sub _select_args_to_query { sub _select_args { my ($self, $ident, $select, $where, $attrs) = @_; + my ($alias2source, $rs_alias) = $self->_resolve_ident_sources ($ident); + my $sql_maker = $self->sql_maker; - my $alias2source = $self->_resolve_ident_sources ($ident); + $sql_maker->{_dbic_rs_attrs} = { + %$attrs, + select => $select, + from => $ident, + where => $where, + $rs_alias + ? ( _source_handle => $alias2source->{$rs_alias}->handle ) + : () + , + }; # calculate bind_attrs before possible $ident mangling my $bind_attrs = {}; @@ -1378,29 +1501,55 @@ sub _select_args { my $fqcn = join ('.', $alias, $col); $bind_attrs->{$fqcn} = $bindtypes->{$col} if $bindtypes->{$col}; - # so that unqualified searches can be bound too - $bind_attrs->{$col} = $bind_attrs->{$fqcn} if $alias eq 'me'; + # Unqialified column names are nice, but at the same time can be + # rather ambiguous. What we do here is basically go along with + # the loop, adding an unqualified column slot to $bind_attrs, + # alongside the fully qualified name. As soon as we encounter + # another column by that name (which would imply another table) + # we unset the unqualified slot and never add any info to it + # to avoid erroneous type binding. If this happens the users + # only choice will be to fully qualify his column name + + if (exists $bind_attrs->{$col}) { + $bind_attrs->{$col} = {}; + } + else { + $bind_attrs->{$col} = $bind_attrs->{$fqcn}; + } } } - my @limit; - if ($attrs->{software_limit} || - $sql_maker->_default_limit_syntax eq "GenericSubQ") { - $attrs->{software_limit} = 1; - } else { + # adjust limits + if ( + $attrs->{software_limit} + || + $sql_maker->_default_limit_syntax eq "GenericSubQ" + ) { + $attrs->{software_limit} = 1; + } + else { $self->throw_exception("rows attribute must be positive if present") if (defined($attrs->{rows}) && !($attrs->{rows} > 0)); # MySQL actually recommends this approach. I cringe. $attrs->{rows} = 2**48 if not defined $attrs->{rows} and defined $attrs->{offset}; + } - if ($attrs->{rows} && keys %{$attrs->{collapse}}) { - ($ident, $select, $where, $attrs) - = $self->_adjust_select_args_for_limited_prefetch ($ident, $select, $where, $attrs); - } - else { - push @limit, $attrs->{rows}, $attrs->{offset}; - } + my @limit; + + # see if we need to tear the prefetch apart (either limited has_many or grouped prefetch) + # otherwise delegate the limiting to the storage, unless software limit was requested + if ( + ( $attrs->{rows} && keys %{$attrs->{collapse}} ) + || + ( $attrs->{group_by} && @{$attrs->{group_by}} && + $attrs->{_prefetch_select} && @{$attrs->{_prefetch_select}} ) + ) { + ($ident, $select, $where, $attrs) + = $self->_adjust_select_args_for_complex_prefetch ($ident, $select, $where, $attrs); + } + elsif (! $attrs->{software_limit} ) { + push @limit, $attrs->{rows}, $attrs->{offset}; } ### @@ -1415,68 +1564,69 @@ sub _select_args { my $order = { map { $attrs->{$_} ? ( $_ => $attrs->{$_} ) : () } - (qw/order_by group_by having _virtual_order_by/ ) + (qw/order_by group_by having/ ) }; - - $sql_maker->{for} = delete $attrs->{for}; - return ('select', $attrs->{bind}, $ident, $bind_attrs, $select, $where, $order, @limit); } -sub _adjust_select_args_for_limited_prefetch { +# +# This is the code producing joined subqueries like: +# SELECT me.*, other.* FROM ( SELECT me.* FROM ... ) JOIN other ON ... +# +sub _adjust_select_args_for_complex_prefetch { my ($self, $from, $select, $where, $attrs) = @_; - if ($attrs->{group_by} and @{$attrs->{group_by}}) { - $self->throw_exception ('Prefetch with limit (rows/offset) is not supported on resultsets with a group_by attribute'); - } - - $self->throw_exception ('Prefetch with limit (rows/offset) is not supported on resultsets with a custom from attribute') + $self->throw_exception ('Complex prefetches are not supported on resultsets with a custom from attribute') if (ref $from 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/; - delete $sub_attrs->{$_} for qw/for collapse select order_by/; + 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/; + + my $select_root_alias = $attrs->{alias}; + my $sql_maker = $self->sql_maker; - my $alias = $attrs->{alias}; + # 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->{-as} ||= $attrs->{as}[$i]; + $select->[$i] = join ('.', $attrs->{alias}, ($sel->{-as} || "select_$i") ); + } - # create subquery select list - my $sub_select = [ grep { $_ =~ /^$alias\./ } @{$attrs->{select}} ]; + push @$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 .. ($#{$attrs->{order_by}} - $ord_cnt - 1) ] + @{$attrs->{order_by}}[ 0 .. $ord_cnt - 1] ]; } - # mangle {from} - $from = [ @$from ]; - my $select_root = shift @$from; - my @outer_from = @$from; + # 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); - # in complex search_related chains $alias may *not* be 'me' - # so always include it in the inner join, and also shift away - # from the outer stack, so that the two datasets actually do - # meet - if ($select_root->{-alias} ne $alias) { - $inner_joins{$alias} = 1; - - while (@outer_from && $outer_from[0][0]{-alias} ne $alias) { - shift @outer_from; - } - if (! @outer_from) { - $self->throw_exception ("Unable to find '$alias' in the {from} stack, something is wrong"); - } - - shift @outer_from; # the new subquery will represent this alias, so get rid of it - } + # 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); # decide which parts of the join will remain on the inside @@ -1486,7 +1636,7 @@ sub _adjust_select_args_for_limited_prefetch { # 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 ocnditions will not satisfy this, but for real + # Most of the join conditions will not satisfy this, but for real # complex queries some might, and we might make some RDBMS happy. # # @@ -1496,8 +1646,9 @@ sub _adjust_select_args_for_limited_prefetch { # It may not be very efficient, but it's a reasonable stop-gap { # 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 { ref $_ ? $_->[0] : $_ } @@ -1505,6 +1656,7 @@ sub _adjust_select_args_for_limited_prefetch { ); 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) { @@ -1512,8 +1664,8 @@ sub _adjust_select_args_for_limited_prefetch { # 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 $piece ($where_sql, @order_by ) { - if ($piece =~ /\b$alias\./) { + for my $piece ($select_sql, $where_sql, @order_by ) { + if ($piece =~ /\b $alias $sep/x) { $inner_joins{$alias} = 1; } } @@ -1536,21 +1688,22 @@ sub _adjust_select_args_for_limited_prefetch { } # construct the inner $from for the subquery - my $inner_from = [ $select_root ]; + my $inner_from = [ $join_root ]; for my $j (@$from) { 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 - - 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} = $sub_select; - last; + unless ($sub_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; + last; + } } } @@ -1561,12 +1714,47 @@ sub _adjust_select_args_for_limited_prefetch { $where, $sub_attrs ); + my $subq_joinspec = { + -alias => $select_root_alias, + -source_handle => $join_root->{-source_handle}, + $select_root_alias => $subq, + }; - # put it in the new {from} - unshift @outer_from, { $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. $artist_rs->search_related ('cds'... ) would result in alias + # of 'cds', which would prevent from doing things like order_by artist.*) + # See t/prefetch/via_search_related.t for a better idea + my @outer_from; + if ($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; + } + } + } # 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 + # 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 + # to both filter the inner select (e.g. to apply a limit) and then have to re-filter + # 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, $attrs); @@ -1576,12 +1764,14 @@ sub _resolve_ident_sources { my ($self, $ident) = @_; my $alias2source = {}; + my $rs_alias; # the reason this is so contrived is that $ident may be a {from} # structure, specifying multiple tables to join if ( Scalar::Util::blessed($ident) && $ident->isa("DBIx::Class::ResultSource") ) { # this is compat mode for insert/update/delete which do not deal with aliases $alias2source->{me} = $ident; + $rs_alias = 'me'; } elsif (ref $ident eq 'ARRAY') { @@ -1589,6 +1779,7 @@ sub _resolve_ident_sources { my $tabinfo; if (ref $_ eq 'HASH') { $tabinfo = $_; + $rs_alias = $tabinfo->{-alias}; } if (ref $_ eq 'ARRAY' and ref $_->[0] eq 'HASH') { $tabinfo = $_->[0]; @@ -1599,7 +1790,57 @@ sub _resolve_ident_sources { } } - return $alias2source; + return ($alias2source, $rs_alias); +} + +# Takes $ident, \@column_names +# +# returns { $column_name => \%column_info, ... } +# also note: this adds -result_source => $rsrc to the column info +# +# usage: +# my $col_sources = $self->_resolve_column_info($ident, @column_names); +sub _resolve_column_info { + my ($self, $ident, $colnames) = @_; + my ($alias2src, $root_alias) = $self->_resolve_ident_sources($ident); + + my $sep = $self->_sql_maker_opts->{name_sep} || '.'; + $sep = "\Q$sep\E"; + + my (%return, %seen_cols); + + # compile a global list of column names, to be able to properly + # disambiguate unqualified column names (if at all possible) + for my $alias (keys %$alias2src) { + my $rsrc = $alias2src->{$alias}; + for my $colname ($rsrc->columns) { + push @{$seen_cols{$colname}}, $alias; + } + } + + COLUMN: + foreach my $col (@$colnames) { + my ($alias, $colname) = $col =~ m/^ (?: ([^$sep]+) $sep)? (.+) $/x; + + unless ($alias) { + # see if the column was seen exactly once (so we know which rsrc it came from) + if ($seen_cols{$colname} and @{$seen_cols{$colname}} == 1) { + $alias = $seen_cols{$colname}[0]; + } + else { + next COLUMN; + } + } + + my $rsrc = $alias2src->{$alias}; + $return{$col} = $rsrc && { + %{$rsrc->column_info($colname)}, + -result_source => $rsrc, + -source_alias => $alias, + }; + } + + return \%return; } # Returns a counting SELECT for a simple count @@ -1798,7 +2039,14 @@ Returns the database driver name. =cut -sub sqlt_type { shift->dbh->{Driver}->{Name} } +sub sqlt_type { shift->_get_dbh->{Driver}->{Name} } + +# By default there is no resolution of DBIC data types to DBI data types +# In essence this makes e.g. AutoCast a noop +sub _dbi_data_type { + #my ($self, $data_type) = @_; + return undef +}; =head2 bind_attribute_by_data_type @@ -1881,13 +2129,13 @@ By default, C<\%sqlt_args> will have { add_drop_table => 1, ignore_constraint_names => 1, ignore_index_names => 1 } -merged with the hash passed in. To disable any of those features, pass in a +merged with the hash passed in. To disable any of those features, pass in a hashref like the following { ignore_constraint_names => 0, # ... other options } -Note that this feature is currently EXPERIMENTAL and may not work correctly +Note that this feature is currently EXPERIMENTAL and may not work correctly across all databases, or fully handle complex relationships. WARNING: Please check all SQL files created, before applying them. @@ -1908,7 +2156,7 @@ sub create_ddl_dir { $version ||= $schema_version; $sqltargs = { - add_drop_table => 1, + add_drop_table => 1, ignore_constraint_names => 1, ignore_index_names => 1, %{$sqltargs || {}} @@ -1948,7 +2196,7 @@ sub create_ddl_dir { } print $file $output; close($file); - + next unless ($preversion); require SQL::Translator::Diff; @@ -1964,7 +2212,7 @@ sub create_ddl_dir { carp("Overwriting existing diff file - $difffile"); unlink($difffile); } - + my $source_schema; { my $t = SQL::Translator->new($sqltargs); @@ -1983,7 +2231,7 @@ sub create_ddl_dir { unless ( $source_schema->name ); } - # The "new" style of producers have sane normalization and can support + # The "new" style of producers have sane normalization and can support # diffing a SQL file against a DBIC->SQLT schema. Old style ones don't # And we have to diff parsed SQL against parsed SQL. my $dest_schema = $sqlt_schema; @@ -2004,12 +2252,12 @@ sub create_ddl_dir { $dest_schema->name( $filename ) unless $dest_schema->name; } - + my $diff = SQL::Translator::Diff::schema_diff($source_schema, $db, $dest_schema, $db, $sqltargs ); - if(!open $file, ">$difffile") { + if(!open $file, ">$difffile") { $self->throw_exception("Can't write to $difffile ($!)"); next; } @@ -2044,8 +2292,6 @@ 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 ||= './'; @@ -2053,7 +2299,7 @@ sub deployment_statements { if(-f $filename) { my $file; - open($file, "<$filename") + open($file, "<$filename") or $self->throw_exception("Can't open $filename ($!)"); my @rows = <$file>; close($file); @@ -2064,18 +2310,18 @@ sub deployment_statements { . $self->_check_sqlt_message . q{'}) if !$self->_check_sqlt_version; - require SQL::Translator::Parser::DBIx::Class; - eval qq{use SQL::Translator::Producer::${type}}; - $self->throw_exception($@) if $@; - - # sources needs to be a parser arg, but for simplicty allow at top level + # 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, + ); + return $tr->translate; } sub deploy { @@ -2090,7 +2336,9 @@ 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}")}; @@ -2119,7 +2367,7 @@ Returns the datetime parser class sub datetime_parser { my $self = shift; return $self->{datetime_parser} ||= do { - $self->ensure_connected; + $self->_populate_dbh unless $self->_dbh; $self->build_datetime_parser(@_); }; } @@ -2173,7 +2421,7 @@ returned by databases that don't support replication. sub is_replicating { return; - + } =head2 lag_behind_master @@ -2190,8 +2438,13 @@ sub lag_behind_master { sub DESTROY { my $self = shift; - return if !$self->_dbh; - $self->_verify_pid; + $self->_verify_pid if $self->_dbh; + + # some databases need this to stop spewing warnings + if (my $dbh = $self->_dbh) { + eval { $dbh->disconnect }; + } + $self->_dbh(undef); } @@ -2203,7 +2456,7 @@ sub DESTROY { DBIx::Class can do some wonderful magic with handling exceptions, disconnections, and transactions when you use C<< AutoCommit => 1 >> -combined with C for transaction support. +(the default) combined with C for transaction support. If you set C<< AutoCommit => 0 >> in your connect info, then you are always in an assumed transaction between commits, and you're telling us you'd @@ -2215,7 +2468,6 @@ cases if you choose the C<< AutoCommit => 0 >> path, just as you would be with raw DBI. - =head1 AUTHORS Matt S. Trout