X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FDBIx%2FClass%2FStorage%2FDBI.pm;h=20b1f1f330e96429dec4d5cfd890289d3d26b740;hb=d1ec2830cc15412c0a99d77b97dc95393af1e66a;hp=8df1894bb1af055dc027c6863e44c2ed949659fb;hpb=341d5edefa34c7cdfee74be00eba9cd44ad2b7c4;p=dbsrgits%2FDBIx-Class.git

diff --git a/lib/DBIx/Class/Storage/DBI.pm b/lib/DBIx/Class/Storage/DBI.pm
index 8df1894..20b1f1f 100644
--- a/lib/DBIx/Class/Storage/DBI.pm
+++ b/lib/DBIx/Class/Storage/DBI.pm
@@ -11,6 +11,7 @@ use DBIx::Class::SQLAHacks;
 use DBIx::Class::Storage::DBI::Cursor;
 use DBIx::Class::Storage::Statistics;
 use Scalar::Util qw/blessed weaken/;
+use List::Util();
 
 __PACKAGE__->mk_group_accessors('simple' =>
     qw/_connect_info _dbi_connect_info _dbh _sql_maker _sql_maker_opts
@@ -153,6 +154,10 @@ the database.  Its value may contain:
 
 =over
 
+=item a scalar
+
+This contains one SQL statement to execute.
+
 =item an array reference
 
 This contains SQL statements to execute in order.  Each element contains
@@ -610,35 +615,56 @@ sub _populate_dbh {
   my @info = @{$self->_dbi_connect_info || []};
   $self->_dbh($self->_connect(@info));
 
+  $self->_conn_pid($$);
+  $self->_conn_tid(threads->tid) if $INC{'threads.pm'};
+
+  $self->_determine_driver;
+
   # Always set the transaction depth on connect, since
   #  there is no transaction in progress by definition
   $self->{transaction_depth} = $self->_dbh_autocommit ? 0 : 1;
 
-  if(ref $self eq 'DBIx::Class::Storage::DBI') {
-    my $driver = $self->_dbh->{Driver}->{Name};
+  my $connection_do = $self->on_connect_do;
+  $self->_do_connection_actions($connection_do) if $connection_do;
+}
+
+sub _determine_driver {
+  my ($self) = @_;
+
+  if (ref $self eq 'DBIx::Class::Storage::DBI') {
+    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) = $self->_dbi_connect_info->[0] =~ /dbi:([^:]+):/i;
+    }
+
     if ($self->load_optional_class("DBIx::Class::Storage::DBI::${driver}")) {
       bless $self, "DBIx::Class::Storage::DBI::${driver}";
       $self->_rebless();
     }
   }
-
-  $self->_conn_pid($$);
-  $self->_conn_tid(threads->tid) if $INC{'threads.pm'};
-
-  my $connection_do = $self->on_connect_do;
-  $self->_do_connection_actions($connection_do) if ref($connection_do);
 }
 
 sub _do_connection_actions {
   my $self = shift;
   my $connection_do = shift;
 
-  if (ref $connection_do eq 'ARRAY') {
+  if (!ref $connection_do) {
+    $self->_do_query($connection_do);
+  }
+  elsif (ref $connection_do eq 'ARRAY') {
     $self->_do_query($_) foreach @$connection_do;
   }
   elsif (ref $connection_do eq 'CODE') {
     $connection_do->($self);
   }
+  else {
+    $self->throw_exception (sprintf ("Don't know how to process conection actions of type '%s'", ref $connection_do) );
+  }
 
   return $self;
 }
@@ -900,6 +926,22 @@ 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 ) = @_;
 
@@ -1026,7 +1068,27 @@ sub insert_bulk {
     $sth->bind_param_array( $placeholder_index, [@data], $attributes );
     $placeholder_index++;
   }
-  my $rv = $sth->execute_array({ArrayTupleStatus => $tuple_status});
+  my $rv = eval { $sth->execute_array({ArrayTupleStatus => $tuple_status}) };
+  if (my $err = $@) {
+    my $i = 0;
+    ++$i while $i <= $#$tuple_status && !ref $tuple_status->[$i];
+
+    $self->throw_exception($sth->errstr || "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) }
+      ),
+    );
+  }
   $self->throw_exception($sth->errstr) if !$rv;
 
   $self->_query_end( $sql, @bind );
@@ -1051,6 +1113,97 @@ sub delete {
   return $self->_execute('delete' => [], $source, $bind_attrs, @_);
 }
 
+# We were sent here because the $rs contains a complex search
+# which will require a subquery to select the correct rows
+# (i.e. joined or limited resultsets)
+#
+# Genarating a single PK column subquery is trivial and supported
+# by all RDBMS. However if we have a multicolumn PK, things get ugly.
+# Look at _multipk_update_delete()
+sub subq_update_delete {
+  my $self = shift;
+  my ($rs, $op, $values) = @_;
+
+  my $rsrc = $rs->result_source;
+
+  # we already check this, but double check naively just in case. Should be removed soon
+  my $sel = $rs->_resolved_attrs->{select};
+  $sel = [ $sel ] unless ref $sel eq 'ARRAY';
+  my @pcols = $rsrc->primary_columns;
+  if (@$sel != @pcols) {
+    $self->throw_exception (
+      'Subquery update/delete can not be called on resultsets selecting a'
+     .' number of columns different than the number of primary keys'
+    );
+  }
+
+  if (@pcols == 1) {
+    return $self->$op (
+      $rsrc,
+      $op eq 'update' ? $values : (),
+      { $pcols[0] => { -in => $rs->as_query } },
+    );
+  }
+
+  else {
+    return $self->_multipk_update_delete (@_);
+  }
+}
+
+# ANSI SQL does not provide a reliable way to perform a multicol-PK
+# resultset update/delete involving subqueries. So by default resort
+# to simple (and inefficient) delete_all style per-row opearations,
+# while allowing specific storages to override this with a faster
+# implementation.
+#
+sub _multipk_update_delete {
+  return shift->_per_row_update_delete (@_);
+}
+
+# This is the default loop used to delete/update rows for multi PK
+# resultsets, and used by mysql exclusively (because it can't do anything
+# else).
+#
+# We do not use $row->$op style queries, because resultset update/delete
+# is not expected to cascade (this is what delete_all/update_all is for).
+#
+# There should be no race conditions as the entire operation is rolled
+# in a transaction.
+#
+sub _per_row_update_delete {
+  my $self = shift;
+  my ($rs, $op, $values) = @_;
+
+  my $rsrc = $rs->result_source;
+  my @pcols = $rsrc->primary_columns;
+
+  my $guard = $self->txn_scope_guard;
+
+  # emulate the return value of $sth->execute for non-selects
+  my $row_cnt = '0E0';
+
+  my $subrs_cur = $rs->cursor;
+  while (my @pks = $subrs_cur->next) {
+
+    my $cond;
+    for my $i (0.. $#pcols) {
+      $cond->{$pcols[$i]} = $pks[$i];
+    }
+
+    $self->$op (
+      $rsrc,
+      $op eq 'update' ? $values : (),
+      $cond,
+    );
+
+    $row_cnt++;
+  }
+
+  $guard->commit;
+
+  return $row_cnt;
+}
+
 sub _select {
   my $self = shift;
   my $sql_maker = $self->sql_maker;
@@ -1066,17 +1219,20 @@ sub _select_args {
   my $sql_maker = $self->sql_maker;
   $sql_maker->{for} = $for;
 
-  if (exists $attrs->{group_by} || $attrs->{having}) {
+  my @in_order_attrs = qw/group_by having _virtual_order_by/;
+  if (List::Util::first { exists $attrs->{$_} } (@in_order_attrs) ) {
     $order = {
-      group_by => $attrs->{group_by},
-      having => $attrs->{having},
-      ($order ? (order_by => $order) : ())
+      ($order
+        ? (order_by => $order)
+        : ()
+      ),
+      ( map { $_ => $attrs->{$_} } (@in_order_attrs) )
     };
   }
   my $bind_attrs = {}; ## Future support
   my @args = ('select', $attrs->{bind}, $ident, $bind_attrs, $select, $condition, $order);
   if ($attrs->{software_limit} ||
-      $self->sql_maker->_default_limit_syntax eq "GenericSubQ") {
+      $sql_maker->_default_limit_syntax eq "GenericSubQ") {
         $attrs->{software_limit} = 1;
   } else {
     $self->throw_exception("rows attribute must be positive if present")
@@ -1089,6 +1245,76 @@ sub _select_args {
   return @args;
 }
 
+sub _trim_attributes_for_count {
+  my ($self, $source, $attrs) = @_;
+  my %attrs = %$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/};
+
+  return \%attrs;
+}
+
+sub count {
+  my ($self, $source, $attrs) = @_;
+
+  my $tmp_attrs = $self->_trim_attributes_for_count($source, $attrs);
+
+  # overwrite the selector
+  $tmp_attrs->{select} = { count => '*' };
+
+  my $tmp_rs = $source->resultset_class->new($source, $tmp_attrs);
+  my ($count) = $tmp_rs->cursor->next;
+
+  # if the offset/rows attributes are still present, we did not use
+  # a subquery, so we need to make the calculations in software
+  $count -= $attrs->{offset} if $attrs->{offset};
+  $count = $attrs->{rows} if $attrs->{rows} and $attrs->{rows} < $count;
+  $count = 0 if ($count < 0);
+
+  return $count;
+}
+
+sub count_grouped {
+  my ($self, $source, $attrs) = @_;
+
+  # copy for the subquery, we need to do some adjustments to it too
+  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/;
+
+  # 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
+  # Note: we check $attrs, as $sub_attrs has collapse deleted
+  if (ref $attrs->{collapse} and keys %{$attrs->{collapse}} ) {
+    delete $sub_attrs->{group_by};
+  }
+
+  $sub_attrs->{group_by} ||= [ map { "$attrs->{alias}.$_" } ($source->primary_columns) ];
+  $sub_attrs->{select} = $self->_grouped_count_select ($sub_attrs);
+
+  $attrs->{from} = [{
+    count_subq => $source->resultset_class->new ($source, $sub_attrs )->as_query
+  }];
+
+  # the subquery replaces this
+  delete $attrs->{$_} for qw/where bind prefetch collapse group_by having having_bind rows offset page pager/;
+
+  return $self->count ($source, $attrs);
+}
+
+#
+# Returns a SELECT to go with a supplied GROUP BY
+# (caled by count_grouped so a group_by is present)
+# Most databases expect them to match, but some
+# choke in various ways.
+#
+sub _grouped_count_select {
+  my ($self, $attrs) = @_;
+  return $attrs->{group_by};
+}
+
 sub source_bind_attributes {
   my ($self, $source) = @_;
   
@@ -1276,7 +1502,7 @@ sub bind_attribute_by_data_type {
     return;
 }
 
-=head2 create_ddl_dir
+=head2 create_ddl_dir (EXPERIMENTAL)
 
 =over 4
 
@@ -1285,7 +1511,38 @@ sub bind_attribute_by_data_type {
 =back
 
 Creates a SQL file based on the Schema, for each of the specified
-database types, in the given directory.
+database engines in C<\@databases> in the given directory.
+(note: specify L<SQL::Translator> names, not L<DBI> driver names).
+
+Given a previous version number, this will also create a file containing
+the ALTER TABLE statements to transform the previous schema into the
+current one. Note that these statements may contain C<DROP TABLE> or
+C<DROP COLUMN> statements that can potentially destroy data.
+
+The file names are created using the C<ddl_filename> method below, please
+override this method in your schema if you would like a different file
+name format. For the ALTER file, the same format is used, replacing
+$version in the name with "$preversion-$version".
+
+See L<SQL::Translator/METHODS> for a list of values for C<\%sqlt_args>.
+The most common value for this would be C<< { add_drop_table => 1 } >>
+to have the SQL produced include a C<DROP TABLE> statement for each table
+created. For quoting purposes supply C<quote_table_names> and
+C<quote_field_names>.
+
+If no arguments are passed, then the following default values are assumed:
+
+=over 4
+
+=item databases  - ['MySQL', 'SQLite', 'PostgreSQL']
+
+=item version    - $schema->schema_version
+
+=item directory  - './'
+
+=item preversion - <none>
+
+=back
 
 By default, C<\%sqlt_args> will have
 
@@ -1296,6 +1553,12 @@ hashref like the following
 
  { ignore_constraint_names => 0, # ... other options }
 
+
+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.
+
 =cut
 
 sub create_ddl_dir {
@@ -1431,8 +1694,9 @@ sub create_ddl_dir {
 =back
 
 Returns the statements used by L</deploy> and L<DBIx::Class::Schema/deploy>.
-The database driver name is given by C<$type>, though the value from
-L</sqlt_type> is used if it is not specified.
+
+The L<SQL::Translator> (not L<DBI>) database driver name can be explicitly
+provided in C<$type>, otherwise the result of L</sqlt_type> is used as default.
 
 C<$directory> is used to return statements from files in a previously created
 L</create_ddl_dir> directory and is optional. The filenames are constructed
@@ -1500,7 +1764,7 @@ sub deploy {
     }
     $self->_query_end($line);
   };
-  my @statements = $self->deployment_statements($schema, $type, undef, $dir, { no_comments => 1, %{ $sqltargs || {} } } );
+  my @statements = $self->deployment_statements($schema, $type, undef, $dir, { %{ $sqltargs || {} }, no_comments => 1 } );
   if (@statements > 1) {
     foreach my $statement (@statements) {
       $deploy->( $statement );