Cleanup exception handling

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

diff --git a/lib/DBIx/Class/Storage/DBI/ODBC/Microsoft_SQL_Server.pm b/lib/DBIx/Class/Storage/DBI/ODBC/Microsoft_SQL_Server.pm
index 6676bfb..bf01131 100644 (file)
--- a/lib/DBIx/Class/Storage/DBI/ODBC/Microsoft_SQL_Server.pm
+++ b/lib/DBIx/Class/Storage/DBI/ODBC/Microsoft_SQL_Server.pm
@@ -5,7 +5,6 @@ use warnings;
 use base qw/DBIx::Class::Storage::DBI::MSSQL/;
 use mro 'c3';
 
-use Carp::Clan qw/^DBIx::Class/;
 use List::Util();
 use Scalar::Util ();
 
@@ -44,11 +43,12 @@ concurrent statements.
 Will add C<< odbc_cursortype => 2 >> to your DBI connection attributes. See
 L<DBD::ODBC/odbc_cursortype> for more information.
 
-Alternatively, you can add it yourself and dynamic cursor will be automatically
-enabled.
+Alternatively, you can add it yourself and dynamic cursor support will be
+automatically enabled.
 
-This will not work with CODE ref connect_info's and will do nothing if you set
-C<odbc_cursortype> yourself.
+If you're using FreeTDS, C<tds_version> must be set to at least C<8.0>.
+
+This will not work with CODE ref connect_info's.
 
 B<WARNING:> this will break C<SCOPE_IDENTITY()>, and C<SELECT @@IDENTITY> will
 be used instead, which on SQL Server 2005 and later will return erroneous
@@ -61,7 +61,7 @@ sub connect_call_use_dynamic_cursors {
   my $self = shift;
 
   if (ref($self->_dbi_connect_info->[0]) eq 'CODE') {
-    croak 'cannot set DBI attributes on a CODE ref connect_info';
+    $self->throw_exception ('cannot set DBI attributes on a CODE ref connect_info');
   }
 
   my $dbi_attrs = $self->_dbi_connect_info->[-1];
@@ -74,25 +74,45 @@ sub connect_call_use_dynamic_cursors {
   if (not exists $dbi_attrs->{odbc_cursortype}) {
     # turn on support for multiple concurrent statements, unless overridden
     $dbi_attrs->{odbc_cursortype} = 2;
-    my $connected = defined $self->_dbh;
-    $self->disconnect;
-    $self->ensure_connected if $connected;
+    $self->disconnect; # resetting dbi attrs, so have to reconnect
+    $self->ensure_connected;
     $self->_set_dynamic_cursors;
   }
 }
 
 sub _set_dynamic_cursors {
   my $self = shift;
+  my $dbh  = $self->_get_dbh;
+
+  eval {
+    local $dbh->{RaiseError} = 1;
+    local $dbh->{PrintError} = 0;
+    $dbh->do('SELECT @@IDENTITY');
+  };
+  if ($@) {
+    $self->throw_exception (<<'EOF');
+
+Your drivers do not seem to support dynamic cursors (odbc_cursortype => 2),
+if you're using FreeTDS, make sure to set tds_version to 8.0 or greater.
+EOF
+  }
+
   $self->_using_dynamic_cursors(1);
   $self->_identity_method('@@identity');
 }
 
-sub _rebless {
-  no warnings 'uninitialized';
+sub _init {
   my $self = shift;
 
-  if (ref($self->_dbi_connect_info->[0]) ne 'CODE' &&
-      eval { $self->_dbi_connect_info->[-1]{odbc_cursortype} } == 2) {
+  no warnings qw/uninitialized/;
+
+  if (
+    ref($self->_dbi_connect_info->[0]) ne 'CODE'
+      &&
+    ref ($self->_dbi_connect_info->[-1]) eq 'HASH'
+      &&
+    $self->_dbi_connect_info->[-1]{odbc_cursortype} == 2
+  ) {
     $self->_set_dynamic_cursors;
     return;
   }
@@ -121,14 +141,14 @@ sub connect_call_use_server_cursors {
   my $self            = shift;
   my $sql_rowset_size = shift || 2;
 
-  $self->_dbh->{odbc_SQL_ROWSET_SIZE} = $sql_rowset_size;
+  $self->_get_dbh->{odbc_SQL_ROWSET_SIZE} = $sql_rowset_size;
 }
 
-=head2 connect_call_use_mars
+=head2 connect_call_use_MARS
 
 Use as:
 
-  on_connect_call => 'use_mars'
+  on_connect_call => 'use_MARS'
 
 Use to enable a feature of SQL Server 2005 and later, "Multiple Active Result
 Sets". See L<DBD::ODBC::FAQ/Does DBD::ODBC support Multiple Active Statements?>
@@ -138,20 +158,20 @@ B<WARNING>: This has implications for the way transactions are handled.
 
 =cut
 
-sub connect_call_use_mars {
+sub connect_call_use_MARS {
   my $self = shift;
 
   my $dsn = $self->_dbi_connect_info->[0];
 
   if (ref($dsn) eq 'CODE') {
-    croak 'cannot change the DBI DSN on a CODE ref connect_info';
+    $self->throw_exception('cannot change the DBI DSN on a CODE ref connect_info');
   }
 
   if ($dsn !~ /MARS_Connection=/) {
     $self->_dbi_connect_info->[0] = "$dsn;MARS_Connection=Yes";
-    my $connected = defined $self->_dbh;
+    my $was_connected = defined $self->_dbh;
     $self->disconnect;
-    $self->ensure_connected if $connected;
+    $self->ensure_connected if $was_connected;
   }
 }