use List::Util ();
__PACKAGE__->mk_group_accessors('simple' =>
- qw/_identity _blob_log_on_update insert_txn _extra_dbh/
+ qw/_identity _blob_log_on_update _insert_dbh _identity_method/
);
=head1 NAME
With this driver there is unfortunately no way to get the C<last_insert_id>
without doing a C<SELECT MAX(col)>. This is done safely in a transaction
-(locking the table.) The transaction can be turned off if concurrency is not an
-issue, or you don't need the C<IDENTITY> value, see
-L<DBIx::Class::Storage::DBI::Sybase/connect_call_unsafe_insert>.
-
-But your queries will be cached.
+(locking the table.) See L</INSERTS WITH PLACEHOLDERS>.
A recommended L<DBIx::Class::Storage::DBI/connect_info> setting:
} else { # real Sybase
my $no_bind_vars = 'DBIx::Class::Storage::DBI::Sybase::NoBindVars';
-# This is reset to 0 in ::NoBindVars, only necessary because we use max(col) to
-# get the identity.
- $self->insert_txn(1);
-
if ($self->using_freetds) {
carp <<'EOF' unless $ENV{DBIC_SYBASE_FREETDS_NOWARN};
$self->set_textsize; # based on LongReadLen in connect_info
}
- elsif (not $self->dbh->{syb_dynamic_supported}) {
+ elsif (not $self->_get_dbh->{syb_dynamic_supported}) {
# not necessarily FreeTDS, but no placeholders nevertheless
$self->ensure_class_loaded($no_bind_vars);
bless $self, $no_bind_vars;
$self->_dbh->do('SET CHAINED ON');
}
}
-
-# for insert transactions
- $self->_extra_dbh($self->_connect(@{ $self->_dbi_connect_info }));
- $self->_extra_dbh->{AutoCommit} = 1;
}
=head2 connect_call_blob_setup
if exists $args{log_on_update};
}
-=head2 connect_call_unsafe_insert
-
-With placeholders enabled, inserts are done in a transaction so that there are
-no concurrency issues with getting the inserted identity value using
-C<SELECT MAX(col)> when placeholders are enabled.
-
-When using C<DBIx::Class::Storage::DBI::Sybase::NoBindVars> transactions are
-disabled.
-
-To turn off transactions for inserts (for an application that doesn't need
-concurrency, or a loader, for example) use this setting in
-L<DBIx::Class::Storage::DBI/connect_info>,
-
- on_connect_call => ['unsafe_insert']
-
-To manipulate this setting at runtime, use:
-
- $schema->storage->insert_txn(0); # 1 to re-enable
-
-=cut
-
-sub connect_call_unsafe_insert {
- my $self = shift;
- $self->insert_txn(0);
-}
-
sub _is_lob_type {
my $self = shift;
my $type = shift;
my ($self, $type) = @_;
$type = lc $type;
- $type =~ s/ identity//;
+ $type =~ s/\s* identity//x;
return uc($TYPE_MAPPING{$type} || $type);
}
sub last_insert_id { shift->_identity }
-# override to handle TEXT/IMAGE and to do a transaction if necessary
+# handles TEXT/IMAGE and transaction for last_insert_id
sub insert {
my $self = shift;
my ($source, $to_insert) = @_;
my $blob_cols = $self->_remove_blob_cols($source, $to_insert);
+# insert+blob insert done atomically, on _insert_dbh
+ (my ($guard), local ($self->{_dbh})) = do {
+ $self->_insert_dbh($self->_connect(@{ $self->_dbi_connect_info }))
+ unless $self->_insert_dbh;
+
+ my $new_guard = $self->txn_scope_guard;
+
+# _dbh_begin_work may reconnect, if so we need to update _insert_dbh
+ $self->_insert_dbh($self->_dbh);
+
+ ($new_guard, $self->_insert_dbh)
+ } if $blob_cols;
+
my $need_last_insert_id = 0;
my ($identity_col) =
# We have to do the insert in a transaction to avoid race conditions with the
# SELECT MAX(COL) identity method used when placeholders are enabled.
my $updated_cols = do {
- if ($need_last_insert_id && $self->insert_txn &&
- (not $self->{transaction_depth})) {
- local $self->{_dbh} = $self->_extra_dbh;
+ no warnings 'uninitialized';
+ if (
+ $need_last_insert_id &&
+ $self->_identity_method ne '@@IDENTITY' &&
+ !$self->{transaction_depth}
+ ) {
+ $self->_insert_dbh($self->_connect(@{ $self->_dbi_connect_info }))
+ unless $self->_insert_dbh;
+ local $self->{_dbh} = $self->_insert_dbh;
+
my $guard = $self->txn_scope_guard;
+
+# _dbh_begin_work may reconnect, if so we need to update _insert_dbh
+ $self->_insert_dbh($self->_dbh);
+
my $upd_cols = $self->next::method (@_);
$guard->commit;
+
$upd_cols;
}
else {
}
};
- $self->_insert_blobs($source, $blob_cols, $to_insert) if %$blob_cols;
+ $self->_insert_blobs($source, $blob_cols, $to_insert) if $blob_cols;
+
+ $guard->commit if $guard;
return $updated_cols;
}
my $blob_cols = $self->_remove_blob_cols($source, $fields);
+# update+blob update(s) done atomically
+ my $guard = $self->txn_scope_guard if $blob_cols;
+
my @res;
if ($wantarray) {
@res = $self->next::method(@_);
$self->next::method(@_);
}
- $self->_update_blobs($source, $blob_cols, $where) if %$blob_cols;
+ $self->_update_blobs($source, $blob_cols, $where) if $blob_cols;
+
+ $guard->commit if $guard;
return $wantarray ? @res : $res[0];
}
}
}
- return \%blob_cols;
+ return keys %blob_cols ? \%blob_cols : undef;
}
sub _update_blobs {
sub _insert_blobs {
my ($self, $source, $blob_cols, $row) = @_;
- my $dbh = $self->dbh;
+ my $dbh = $self->_get_dbh;
my $table = $source->from;
my $self = shift;
$self->next::method(@_);
if ($self->using_freetds) {
- $self->dbh->do('BEGIN TRAN');
+ $self->_get_dbh->do('BEGIN TRAN');
}
}
sub _svp_begin {
my ($self, $name) = @_;
- $self->dbh->do("SAVE TRANSACTION $name");
+ $self->_get_dbh->do("SAVE TRANSACTION $name");
}
# A new SAVE TRANSACTION with the same name releases the previous one.
sub _svp_rollback {
my ($self, $name) = @_;
- $self->dbh->do("ROLLBACK TRANSACTION $name");
+ $self->_get_dbh->do("ROLLBACK TRANSACTION $name");
}
1;
Inserts or updates of TEXT/IMAGE columns will B<NOT> work with FreeTDS.
+=head1 INSERTS WITH PLACEHOLDERS
+
+With placeholders enabled, inserts are done in a transaction so that there are
+no concurrency issues with getting the inserted identity value using
+C<SELECT MAX(col)>, which is the only way to get the C<IDENTITY> value in this
+mode.
+
+When using C<DBIx::Class::Storage::DBI::Sybase::NoBindVars> transactions are
+disabled, as there are no concurrency issues with C<SELECT @@IDENTITY> as it's a
+session variable.
+
=head1 TRANSACTIONS
Due to limitations of the TDS protocol, L<DBD::Sybase>, or both; you cannot
begin a transaction while there are active cursors. An active cursor is, for
example, a L<ResultSet|DBIx::Class::ResultSet> that has been executed using
C<next> or C<first> but has not been exhausted or
-L<DBIx::Class::ResultSet/reset>.
+L<reset|DBIx::Class::ResultSet/reset>.
-To get around this problem, use L<DBIx::Class::ResultSet/all> for smaller
-ResultSets, and/or put the active cursors you will need in the scope of the
-transaction.
+For example, this will not work:
+
+ $schema->txn_do(sub {
+ my $rs = $schema->resultset('Book');
+ while (my $row = $rs->next) {
+ $schema->resultset('MetaData')->create({
+ book_id => $row->id,
+ ...
+ });
+ }
+ });
Transactions done for inserts in C<AutoCommit> mode when placeholders are in use
-are not affected, as they are executed on a separate connection.
+are not affected, as they use an extra database handle to do the insert.
+
+Some workarounds:
+
+=over 4
+
+=item * use L<DBIx::Class::Storage::DBI::Replicated>
+
+=item * L<connect|DBIx::Class::Schema/connect> another L<Schema|DBIx::Class::Schema>
+
+=item * load the data from your cursor with L<DBIx::Class::ResultSet/all>
+
+=back
=head1 MAXIMUM CONNECTIONS
projects / dbsrgits/DBIx-Class.git / blobdiff