That's an embarrasing c/p :(

[dbsrgits/DBIx-Class.git] / lib / DBIx / Class / Storage / DBI / ADO / Microsoft_SQL_Server.pm

diff --git a/lib/DBIx/Class/Storage/DBI/ADO/Microsoft_SQL_Server.pm b/lib/DBIx/Class/Storage/DBI/ADO/Microsoft_SQL_Server.pm
index e375b2c..90d7639 100644 (file)
--- a/lib/DBIx/Class/Storage/DBI/ADO/Microsoft_SQL_Server.pm
+++ b/lib/DBIx/Class/Storage/DBI/ADO/Microsoft_SQL_Server.pm
@@ -14,6 +14,86 @@ sub _rebless {
   $self->_identity_method('@@identity');
 }
 
+sub source_bind_attributes {
+  my $self = shift;
+  my ($source) = @_;
+
+  my $bind_attributes = $self->next::method(@_);
+
+  foreach my $column ($source->columns) {
+    $bind_attributes->{$column}{ado_size} ||= 8000; # max VARCHAR
+  }
+
+  return $bind_attributes;
+}
+
+sub bind_attribute_by_data_type {
+  my ($self, $data_type) = @_;
+
+  ($data_type = lc($data_type)) =~ s/\s+.*//;
+
+  my $max_size =
+    $self->_mssql_max_data_type_representation_size_in_bytes->{$data_type};
+
+  my $res = {};
+  $res->{ado_size} = $max_size if $max_size;
+
+  return $res;
+}
+
+# approximate
+# XXX needs to support varchar(max) and varbinary(max)
+sub _mssql_max_data_type_representation_size_in_bytes {
+  my $self = shift;
+
+  my $blob_max = $self->_get_dbh->{LongReadLen} || 32768;
+
+  return +{
+# MSSQL types
+    char => 8000,
+    varchar => 8000,
+    binary => 8000,
+    varbinary => 8000,
+    nchar => 8000,
+    nvarchar => 8000,
+    numeric => 100,
+    smallint => 100,
+    tinyint => 100,
+    smallmoney => 100,
+    bigint => 100,
+    bit => 100,
+    decimal => 100,
+    integer => 100,
+    int => 100,
+    money => 100,
+    float => 100,
+    real => 100,
+    uniqueidentifier => 100,
+    ntext => $blob_max,
+    text => $blob_max,
+    image => $blob_max,
+    date => 100,
+    datetime => 100,
+    datetime2 => 100,
+    datetimeoffset => 100,
+    smalldatetime => 100,
+    time => 100,
+    timestamp => 100,
+    cursor => 100,
+    hierarchyid => 100,
+    sql_variant => 100,
+    table => 100,
+    xml => $blob_max, # ???
+
+# some non-MSSQL types
+    serial => 100,
+    bigserial => 100,
+    varchar2 => 8000,
+    blob => $blob_max,
+    clob => $blob_max,
+  }
+}
+
 1;
 
 =head1 NAME
@@ -30,10 +110,29 @@ This subclass supports MSSQL server connections via L<DBD::ADO>.
 The MSSQL specific functionality is provided by
 L<DBIx::Class::Storage::DBI::MSSQL>.
 
+=head2 CAVEATS
+
+=head3 identities
+
 C<_identity_method> is set to C<@@identity>, as C<SCOPE_IDENTITY()> doesn't work
 with L<DBD::ADO>. See L<DBIx::Class::Storage::DBI::MSSQL/IMPLEMENTATION NOTES>
 for caveats regarding this.
 
+=head3 truncation bug
+
+There is a bug with MSSQL ADO providers where data gets truncated based on the
+size of the bind sizes in the first prepare call:
+
+L<https://rt.cpan.org/Ticket/Display.html?id=52048>
+
+The C<ado_size> workaround is used (see L<DBD::ADO/"ADO Providers">) with the
+approximate maximum size of the data_type of the bound column, or 8000 (maximum
+VARCHAR size) if the data_type is not available.
+
+This code is incomplete and may be buggy. Particularly, C<VARCHAR(MAX)> is not
+supported yet. The data_type list for other DBs is also incomplete. Please
+report problems (and send patches.)
+
 =head1 AUTHOR
 
 See L<DBIx::Class/CONTRIBUTORS>.