X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FDBIx%2FClass%2FStorage%2FDBI.pm;h=1a1aeec2e97f285f68652cc47147dd2cad040dea;hb=9041a97a57cd2831d20e3b25772b29f9af3d8ef9;hp=e96dece89b77d7499693962d77f82235f50f0df9;hpb=b5963465440da3fac2f38651f6470355b07a3a9d;p=dbsrgits%2FDBIx-Class-Historic.git

diff --git a/lib/DBIx/Class/Storage/DBI.pm b/lib/DBIx/Class/Storage/DBI.pm
index e96dece..1a1aeec 100644
--- a/lib/DBIx/Class/Storage/DBI.pm
+++ b/lib/DBIx/Class/Storage/DBI.pm
@@ -7,10 +7,9 @@ use strict;
 use warnings;
 use Carp::Clan qw/^DBIx::Class/;
 use DBI;
-use DBIx::Class::SQLAHacks;
 use DBIx::Class::Storage::DBI::Cursor;
 use DBIx::Class::Storage::Statistics;
-use Scalar::Util qw/blessed weaken/;
+use Scalar::Util();
 use List::Util();
 
 __PACKAGE__->mk_group_accessors('simple' =>
@@ -603,6 +602,7 @@ sub sql_maker {
   my ($self) = @_;
   unless ($self->_sql_maker) {
     my $sql_maker_class = $self->sql_maker_class;
+    $self->ensure_class_loaded ($sql_maker_class);
     $self->_sql_maker($sql_maker_class->new( $self->_sql_maker_args ));
   }
   return $self->_sql_maker;
@@ -717,7 +717,7 @@ sub _connect {
 
     if($dbh && !$self->unsafe) {
       my $weak_self = $self;
-      weaken($weak_self);
+      Scalar::Util::weaken($weak_self);
       $dbh->{HandleError} = sub {
           if ($weak_self) {
             $weak_self->throw_exception("DBI Exception: $_[0]");
@@ -898,7 +898,7 @@ sub txn_rollback {
 sub _prep_for_execute {
   my ($self, $op, $extra_bind, $ident, $args) = @_;
 
-  if( blessed($ident) && $ident->isa("DBIx::Class::ResultSource") ) {
+  if( Scalar::Util::blessed($ident) && $ident->isa("DBIx::Class::ResultSource") ) {
     $ident = $ident->from();
   }
 
@@ -910,6 +910,7 @@ sub _prep_for_execute {
   return ($sql, \@bind);
 }
 
+
 sub _fix_bind_params {
     my ($self, @bind) = @_;
 
@@ -926,12 +927,28 @@ sub _fix_bind_params {
         } @bind;
 }
 
+sub _flatten_bind_params {
+    my ($self, @bind) = @_;
+
+    ### Turn @bind from something like this:
+    ###   ( [ "artist", 1 ], [ "cdid", 1, 3 ] )
+    ### to this:
+    ###   ( 1, 1, 3 )
+    return
+        map {
+            if ( defined( $_ && $_->[1] ) ) {
+                @{$_}[ 1 .. $#$_ ];
+            }
+            else { undef; }
+        } @bind;
+}
+
 sub _query_start {
     my ( $self, $sql, @bind ) = @_;
 
     if ( $self->debug ) {
         @bind = $self->_fix_bind_params(@bind);
-        
+
         $self->debugobj->query_start( $sql, @bind );
     }
 }
@@ -990,8 +1007,8 @@ sub _execute {
 
 sub insert {
   my ($self, $source, $to_insert) = @_;
-  
-  my $ident = $source->from; 
+
+  my $ident = $source->from;
   my $bind_attributes = $self->source_bind_attributes($source);
 
   my $updated_cols = {};
@@ -1092,7 +1109,7 @@ sub delete {
   my $self = shift @_;
   my $source = shift @_;
   
-  my $bind_attrs = {}; ## If ever it's needed...
+  my $bind_attrs = $self->source_bind_attributes($source);
   
   return $self->_execute('delete' => [], $source, $bind_attrs, @_);
 }
@@ -1190,31 +1207,61 @@ sub _per_row_update_delete {
 
 sub _select {
   my $self = shift;
+
+  # localization is neccessary as
+  # 1) there is no infrastructure to pass this around (easy to do, but will wait)
+  # 2) _select_args sets it and _prep_for_execute consumes it
   my $sql_maker = $self->sql_maker;
   local $sql_maker->{for};
+
   return $self->_execute($self->_select_args(@_));
 }
 
+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)
+  # 2) _select_args sets it and _prep_for_execute consumes it
+  my $sql_maker = $self->sql_maker;
+  local $sql_maker->{for};
+
+  # my ($op, $bind, $ident, $bind_attrs, $select, $cond, $order, $rows, $offset)
+  #  = $self->_select_args($ident, $select, $cond, $attrs);
+  my ($op, $bind, $ident, $bind_attrs, @args) =
+    $self->_select_args(@_);
+
+  # my ($sql, $prepared_bind) = $self->_prep_for_execute($op, $bind, $ident, [ $select, $cond, $order, $rows, $offset ]);
+  my ($sql, $prepared_bind) = $self->_prep_for_execute($op, $bind, $ident, \@args);
+  $prepared_bind ||= [];
+
+  return wantarray
+    ? ($sql, $prepared_bind, $bind_attrs)
+    : \[ "($sql)", @$prepared_bind ]
+  ;
+}
+
 sub _select_args {
-  my ($self, $ident, $select, $condition, $attrs) = @_;
-  my $order = $attrs->{order_by};
+  my ($self, $ident, $select, $where, $attrs) = @_;
 
-  my $for = delete $attrs->{for};
   my $sql_maker = $self->sql_maker;
-  $sql_maker->{for} = $for;
-
-  my @in_order_attrs = qw/group_by having _virtual_order_by/;
-  if (List::Util::first { exists $attrs->{$_} } (@in_order_attrs) ) {
-    $order = {
-      ($order
-        ? (order_by => $order)
-        : ()
-      ),
-      ( map { $_ => $attrs->{$_} } (@in_order_attrs) )
-    };
+  my $alias2source = $self->_resolve_ident_sources ($ident);
+
+  # calculate bind_attrs before possible $ident mangling
+  my $bind_attrs = {};
+  for my $alias (keys %$alias2source) {
+    my $bindtypes = $self->source_bind_attributes ($alias2source->{$alias}) || {};
+    for my $col (keys %$bindtypes) {
+
+      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';
+    }
   }
-  my $bind_attrs = {}; ## Future support
-  my @args = ('select', $attrs->{bind}, $ident, $bind_attrs, $select, $condition, $order);
+
+  my @limit;
   if ($attrs->{software_limit} ||
       $sql_maker->_default_limit_syntax eq "GenericSubQ") {
         $attrs->{software_limit} = 1;
@@ -1224,18 +1271,211 @@ sub _select_args {
 
     # MySQL actually recommends this approach.  I cringe.
     $attrs->{rows} = 2**48 if not defined $attrs->{rows} and defined $attrs->{offset};
-    push @args, $attrs->{rows}, $attrs->{offset};
+
+    if ($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};
+    }
   }
-  return @args;
+
+###
+  # This would be the point to deflate anything found in $where
+  # (and leave $attrs->{bind} intact). Problem is - inflators historically
+  # expect a row object. And all we have is a resultsource (it is trivial
+  # to extract deflator coderefs via $alias2source above).
+  #
+  # I don't see a way forward other than changing the way deflators are
+  # invoked, and that's just bad...
+###
+
+  my $order = { map
+    { $attrs->{$_} ? ( $_ => $attrs->{$_} ) : ()  }
+    (qw/order_by group_by having _virtual_order_by/ )
+  };
+
+
+  $sql_maker->{for} = delete $attrs->{for};
+
+  return ('select', $attrs->{bind}, $ident, $bind_attrs, $select, $where, $order, @limit);
 }
 
-sub count {
+sub _adjust_select_args_for_limited_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')
+    if (ref $from ne 'ARRAY');
+
+  # separate attributes
+  my $sub_attrs = { %$attrs };
+  delete $attrs->{$_} for qw/where bind rows offset/;
+  delete $sub_attrs->{$_} for qw/for collapse select order_by/;
+
+  my $alias = $attrs->{alias};
+
+  # create subquery select list
+  my $sub_select = [ grep { $_ =~ /^$alias\./ } @{$attrs->{select}} ];
+
+  # bring over all non-collapse-induced order_by into the inner query (if any)
+  # the outer one will have to keep them all
+  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) ]
+    ];
+  }
+
+
+  # mangle the head of the {from}
+  my $self_ident = shift @$from;
+
+  my %join_info = map { $_->[0]{-alias} => $_->[0] } (@$from);
+
+  my (%inner_joins);
+
+  # 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 ocnditions 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
+  # 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 @order_by = (map
+      { ref $_ ? $_->[0] : $_ }
+      $sql_maker->_order_by_chunks ($sub_attrs->{order_by})
+    );
+
+    my $where_sql = $sql_maker->where ($where);
+
+    # sort needed joins
+    for my $alias (keys %join_info) {
+
+      # 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\./) {
+          $inner_joins{$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$/i) );
+
+    if ($inner_joins{$alias}) {
+      $inner_joins{$_} = 1 for (@{$j->{-join_path}});
+    }
+  }
+
+  # construct the inner $from for the subquery
+  my $inner_from = [ $self_ident ];
+  if (keys %inner_joins) {
+    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;
+      }
+    }
+  }
+
+  # generate the subquery
+  my $subq = $self->_select_args_to_query (
+    $inner_from,
+    $sub_select,
+    $where,
+    $sub_attrs
+  );
+
+  # put it back in $from
+  unshift @$from, { $alias => $subq };
+
+  # This is totally horrific - the $where ends up in both the inner and outer query
+  # Unfortunately not much can be done until SQLA2 introspection arrives
+  #
+  # OTOH it can be seen as a plus: <ash> (notes that this query would make a DBA cry ;)
+  return ($from, $select, $where, $attrs);
+}
+
+sub _resolve_ident_sources {
+  my ($self, $ident) = @_;
+
+  my $alias2source = {};
+
+  # 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;
+  }
+  elsif (ref $ident eq 'ARRAY') {
+
+    for (@$ident) {
+      my $tabinfo;
+      if (ref $_ eq 'HASH') {
+        $tabinfo = $_;
+      }
+      if (ref $_ eq 'ARRAY' and ref $_->[0] eq 'HASH') {
+        $tabinfo = $_->[0];
+      }
+
+      $alias2source->{$tabinfo->{-alias}} = $tabinfo->{-source_handle}->resolve
+        if ($tabinfo->{-source_handle});
+    }
+  }
+
+  return $alias2source;
+}
+
+sub _copy_attributes_for_count {
   my ($self, $source, $attrs) = @_;
+  my %attrs = %$attrs;
 
-  my $tmp_attrs = { %$attrs };
+  # take off any column specs, any pagers, record_filter is cdbi, and no point of ordering a count
+  delete @attrs{qw/select as rows offset page order_by record_filter/};
 
-  # take off any pagers, record_filter is cdbi, and no point of ordering a count
-  delete $tmp_attrs->{$_} for (qw/select as rows offset page order_by record_filter/);
+  return \%attrs;
+}
+
+sub count {
+  my ($self, $source, $attrs) = @_;
+
+  my $tmp_attrs = $self->_copy_attributes_for_count($source, $attrs);
 
   # overwrite the selector
   $tmp_attrs->{select} = { count => '*' };
@@ -1259,7 +1499,7 @@ sub count_grouped {
   my $sub_attrs = { %$attrs };
 
   # these can not go in the subquery, and there is no point of ordering it
-  delete $sub_attrs->{$_} for qw/prefetch collapse select as order_by/;
+  delete $sub_attrs->{$_} for qw/collapse select as order_by/;
 
   # if we prefetch, we group_by primary keys only as this is what we would get out of the rs via ->next/->all
   # simply deleting group_by suffices, as the code below will re-fill it
@@ -1276,7 +1516,7 @@ sub count_grouped {
   }];
 
   # the subquery replaces this
-  delete $attrs->{$_} for qw/where bind prefetch collapse group_by having having_bind rows offset page pager/;
+  delete $attrs->{$_} for qw/where bind collapse group_by having having_bind rows offset/;
 
   return $self->count ($source, $attrs);
 }
@@ -1479,6 +1719,27 @@ sub bind_attribute_by_data_type {
     return;
 }
 
+=head2 is_datatype_numeric
+
+Given a datatype from column_info, returns a boolean value indicating if
+the current RDBMS considers it a numeric value. This controls how
+L<DBIx::Class::Row/set_column> decides whether to mark the column as
+dirty - when the datatype is deemed numeric a C<< != >> comparison will
+be performed instead of the usual C<eq>.
+
+=cut
+
+sub is_datatype_numeric {
+  my ($self, $dt) = @_;
+
+  return 0 unless $dt;
+
+  return $dt =~ /^ (?:
+    numeric | int(?:eger)? | (?:tiny|small|medium|big)int | dec(?:imal)? | real | float | double (?: \s+ precision)? | (?:big)?serial
+  ) $/ix;
+}
+
+
 =head2 create_ddl_dir (EXPERIMENTAL)
 
 =over 4