use warnings;
use base qw/
- DBIx::Class::Storage::DBI::Sybase::Base
- DBIx::Class::Storage::DBI
+ DBIx::Class::Storage::DBI::Sybase::Common
+ DBIx::Class::Storage::DBI::AutoCast
/;
use mro 'c3';
use Carp::Clan qw/^DBIx::Class/;
use List::Util ();
__PACKAGE__->mk_group_accessors('simple' =>
- qw/_identity _blob_log_on_update _auto_cast _insert_txn/
+ qw/_identity _blob_log_on_update _insert_dbh _identity_method/
);
=head1 NAME
also enable that driver explicitly, see the documentation for more details.
With this driver there is unfortunately no way to get the C<last_insert_id>
-without doing a C<SELECT MAX(col)>.
-
-But your queries will be cached.
-
-You need a version of L<DBD::Sybase> compiled with the Sybase OpenClient
-libraries, B<NOT> FreeTDS, for placeholder support. Otherwise your storage will
-be automatically reblessed into C<::NoBindVars>.
+without doing a C<SELECT MAX(col)>. This is done safely in a transaction
+(locking the table.) See L</INSERTS WITH PLACEHOLDERS>.
A recommended L<DBIx::Class::Storage::DBI/connect_info> setting:
if (ref($self) eq 'DBIx::Class::Storage::DBI::Sybase') {
my $dbtype = eval {
- @{$self->dbh->selectrow_arrayref(qq{sp_server_info \@attribute_id=1})}[2]
+ @{$self->_get_dbh->selectrow_arrayref(qq{sp_server_info \@attribute_id=1})}[2]
} || '';
my $exception = $@;
} 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) {
+ if ($self->using_freetds) {
carp <<'EOF' unless $ENV{DBIC_SYBASE_FREETDS_NOWARN};
You are using FreeTDS with Sybase.
TEXT/IMAGE columns will definitely not work.
-You are encouraged to recompile DBD::Sybase with the Sybase OpenClient libraries
+You are encouraged to recompile DBD::Sybase with the Sybase Open Client libraries
instead.
See perldoc DBIx::Class::Storage::DBI::Sybase for more details.
To turn off this warning set the DBIC_SYBASE_FREETDS_NOWARN environment
variable.
EOF
- if (not $self->_placeholders_with_type_conversion_supported) {
+ if (not $self->_typeless_placeholders_supported) {
if ($self->_placeholders_supported) {
- $self->_auto_cast(1);
+ $self->auto_cast(1);
} else {
$self->ensure_class_loaded($no_bind_vars);
bless $self, $no_bind_vars;
$self->_rebless;
}
}
- }
- if (not $self->dbh->{syb_dynamic_supported}) {
+ $self->set_textsize; # based on LongReadLen in connect_info
+
+ }
+ 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->_rebless;
+ } elsif (not $self->_typeless_placeholders_supported) {
+# this is highly unlikely, but we check just in case
+ $self->auto_cast(1);
}
-
+
$self->_set_max_connect(256);
}
}
$self->next::method(@_);
- if (not $self->_using_freetds) {
+ if (not $self->using_freetds) {
$self->_dbh->{syb_chained_txn} = 1;
} else {
if ($self->_dbh_autocommit) {
$type && $type =~ /(?:text|image|lob|bytea|binary|memo)/i;
}
-# The select-piggybacking-on-insert trick stolen from odbc/mssql
sub _prep_for_execute {
my $self = shift;
my ($op, $extra_bind, $ident, $args) = @_;
my ($sql, $bind) = $self->next::method (@_);
-# Some combinations of FreeTDS and Sybase throw implicit conversion errors for
-# all placeeholders, so we convert them into CASTs here.
-# Based on code in ::DBI::NoBindVars .
-#
-# If we're using ::NoBindVars, there are no binds by this point so this code
-# gets skippeed.
- if ($self->_auto_cast && @$bind) {
- my $new_sql;
- my @sql_part = split /\?/, $sql;
- my $col_info = $self->_resolve_column_info($ident,[ map $_->[0], @$bind ]);
-
- foreach my $bound (@$bind) {
- my $col = $bound->[0];
- my $syb_type = $self->_syb_base_type($col_info->{$col}{data_type});
-
- foreach my $data (@{$bound}[1..$#$bound]) {
- $new_sql .= shift(@sql_part) .
- ($syb_type ? "CAST(? AS $syb_type)" : '?');
- }
- }
- $new_sql .= join '', @sql_part;
- $sql = $new_sql;
- }
-
if ($op eq 'insert') {
my $table = $ident->from;
my $bind_info = $self->_resolve_column_info(
$ident, [map $_->[0], @{$bind}]
);
- my $identity_col =
-List::Util::first { $bind_info->{$_}{is_auto_increment} } (keys %$bind_info);
+ my $identity_col = List::Util::first
+ { $bind_info->{$_}{is_auto_increment} }
+ (keys %$bind_info)
+ ;
if ($identity_col) {
- $sql =
-"SET IDENTITY_INSERT $table ON\n" .
-"$sql\n" .
-"SET IDENTITY_INSERT $table OFF"
- } else {
- $identity_col = List::Util::first {
- $ident->column_info($_)->{is_auto_increment}
- } $ident->columns;
+ $sql = join ("\n",
+ "SET IDENTITY_INSERT $table ON",
+ $sql,
+ "SET IDENTITY_INSERT $table OFF",
+ );
+ }
+ else {
+ $identity_col = List::Util::first
+ { $ident->column_info($_)->{is_auto_increment} }
+ $ident->columns
+ ;
}
if ($identity_col) {
return ($sql, $bind);
}
-# Stolen from SQLT, with some modifications. This will likely change when the
-# SQLT Sybase stuff is redone/fixed-up.
-my %TYPE_MAPPING = (
+# Stolen from SQLT, with some modifications. This is a makeshift
+# solution before a sane type-mapping library is available, thus
+# the 'our' for easy overrides.
+our %TYPE_MAPPING = (
number => 'numeric',
money => 'money',
varchar => 'varchar',
long => 'varchar',
);
-sub _syb_base_type {
+sub _native_data_type {
my ($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, $source, $to_insert) = splice @_, 0, 3;
- my $dbh = $self->_dbh;
+ my $self = shift;
+ my ($source, $to_insert) = @_;
my $blob_cols = $self->_remove_blob_cols($source, $to_insert);
-# We have to do the insert in a transaction to avoid race conditions with the
-# SELECT MAX(COL) identity method used when placeholders are enabled.
+# insert+blob insert done atomically, on _insert_dbh
+ (my ($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) =
+ map $_->[0],
+ grep $_->[1]{is_auto_increment},
+ map [ $_, $source->column_info($_) ],
+ $source->columns;
+
+ $need_last_insert_id = 1
+ if $identity_col && (not exists $to_insert->{$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 $updated_cols = do {
- if ($self->_insert_txn && (not $self->{transaction_depth})) {
- my $args = \@_;
- my $method = $self->next::can;
- $self->txn_do(
- sub { $self->$method($source, $to_insert, @$args) }
- );
- } else {
- $self->next::method($source, $to_insert, @_);
+ 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->next::method(@_);
}
};
- $self->_insert_blobs($source, $blob_cols, $to_insert) if %$blob_cols;
+ $self->_insert_blobs($source, $blob_cols, $to_insert) if $blob_cols;
+
+ $guard->commit if $guard;
return $updated_cols;
}
sub update {
- my ($self, $source) = splice @_, 0, 2;
- my ($fields, $where) = @_;
- my $wantarray = wantarray;
+ my $self = shift;
+ my ($source, $fields, $where) = @_;
+
+ my $wantarray = wantarray;
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 = $self->next::method($source, @_);
- } else {
- $res[0] = $self->next::method($source, @_);
+ @res = $self->next::method(@_);
+ }
+ elsif (defined $wantarray) {
+ $res[0] = $self->next::method(@_);
+ }
+ else {
+ $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;
for my $col (keys %$blob_cols) {
my $blob = $blob_cols->{$col};
- my $sth;
my %where = map { ($_, $row{$_}) } @primary_cols;
my $cursor = $source->resultset->search(\%where, {
select => [$col]
})->cursor;
$cursor->next;
- $sth = $cursor->sth;
+ my $sth = $cursor->sth;
eval {
do {
my $exception = $@;
$sth->finish if $sth;
if ($exception) {
- if ($self->_using_freetds) {
- croak
-"TEXT/IMAGE operation failed, probably because you're using FreeTDS: " .
-$exception;
+ if ($self->using_freetds) {
+ croak (
+ 'TEXT/IMAGE operation failed, probably because you are using FreeTDS: '
+ . $exception
+ );
} else {
croak $exception;
}
my $dbh = $self->_dbh;
if ($dbh->can('syb_date_fmt')) {
+ # amazingly, this works with FreeTDS
$dbh->syb_date_fmt('ISO_strict');
} elsif (not $old_dbd_warned) {
carp "Your DBD::Sybase is too old to support ".
$old_dbd_warned = 1;
}
- $dbh->do('set dateformat mdy');
+ $dbh->do('SET DATEFORMAT mdy');
1;
}
sub datetime_parser_type { "DateTime::Format::Sybase" }
-# ->begin_work and such have no effect with FreeTDS
+# ->begin_work and such have no effect with FreeTDS but we run them anyway to
+# let the DBD keep any state it needs to.
+#
+# If they ever do start working, the extra statements will do no harm (because
+# Sybase supports nested transactions.)
sub _dbh_begin_work {
my $self = shift;
- if (not $self->_using_freetds) {
- return $self->next::method(@_);
- } else {
- $self->dbh->do('BEGIN TRAN');
+ $self->next::method(@_);
+ if ($self->using_freetds) {
+ $self->_get_dbh->do('BEGIN TRAN');
}
}
sub _dbh_commit {
my $self = shift;
- if (not $self->_using_freetds) {
- return $self->next::method(@_);
- } else {
+ if ($self->using_freetds) {
$self->_dbh->do('COMMIT');
}
+ return $self->next::method(@_);
}
sub _dbh_rollback {
my $self = shift;
- if (not $self->_using_freetds) {
- return $self->next::method(@_);
- } else {
+ if ($self->using_freetds) {
$self->_dbh->do('ROLLBACK');
}
+ return $self->next::method(@_);
}
# savepoint support using ASE syntax
sub _svp_begin {
my ($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;
+=head1 Schema::Loader Support
+
+There is an experimental branch of L<DBIx::Class::Schema::Loader> that will
+allow you to dump a schema from most (if not all) versions of Sybase.
+
+It is available via subversion from:
+
+ http://dev.catalyst.perl.org/repos/bast/branches/DBIx-Class-Schema-Loader/current/
+
+=head1 FreeTDS
+
+This driver supports L<DBD::Sybase> compiled against FreeTDS
+(L<http://www.freetds.org/>) to the best of our ability, however it is
+recommended that you recompile L<DBD::Sybase> against the Sybase Open Client
+libraries. They are a part of the Sybase ASE distribution:
+
+The Open Client FAQ is here:
+L<http://www.isug.com/Sybase_FAQ/ASE/section7.html>.
+
+Sybase ASE for Linux (which comes with the Open Client libraries) may be
+downloaded here: L<http://response.sybase.com/forms/ASE_Linux_Download>.
+
+To see if you're using FreeTDS check C<< $schema->storage->using_freetds >>, or run:
+
+ perl -MDBI -le 'my $dbh = DBI->connect($dsn, $user, $pass); print $dbh->{syb_oc_version}'
+
+Some versions of the libraries involved will not support placeholders, in which
+case the storage will be reblessed to
+L<DBIx::Class::Storage::DBI::Sybase::NoBindVars>.
+
+In some configurations, placeholders will work but will throw implicit type
+conversion errors for anything that's not expecting a string. In such a case,
+the C<auto_cast> option from L<DBIx::Class::Storage::DBI::AutoCast> is
+automatically set, which you may enable on connection with
+L<DBIx::Class::Storage::DBI::AutoCast/connect_call_set_auto_cast>. The type info
+for the C<CAST>s is taken from the L<DBIx::Class::ResultSource/data_type>
+definitions in your Result classes, and are mapped to a Sybase type (if it isn't
+already) using a mapping based on L<SQL::Translator>.
+
+In other configurations, placeholers will work just as they do with the Sybase
+Open Client libraries.
+
+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<reset|DBIx::Class::ResultSet/reset>.
+
+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 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
-L<DBD::Sybase> makes separate connections to the server for active statements in
-the background. By default the number of such connections is limited to 25, on
-both the client side and the server side.
+The TDS protocol makes separate connections to the server for active statements
+in the background. By default the number of such connections is limited to 25,
+on both the client side and the server side.
-This is a bit too low, so on connection the clientside setting is set to C<256>
-(see L<DBD::Sybase/maxConnect>.) You can override it to whatever setting you
-like in the DSN.
+This is a bit too low for a complex L<DBIx::Class> application, so on connection
+the client side setting is set to C<256> (see L<DBD::Sybase/maxConnect>.) You
+can override it to whatever setting you like in the DSN.
See
L<http://infocenter.sybase.com/help/index.jsp?topic=/com.sybase.help.ase_15.0.sag1/html/sag1/sag1272.htm>
See L</connect_call_datetime_setup> to setup date formats
for L<DBIx::Class::InflateColumn::DateTime>.
-=head1 IMAGE AND TEXT COLUMNS
+=head1 TEXT/IMAGE COLUMNS
L<DBD::Sybase> compiled with FreeTDS will B<NOT> allow you to insert or update
C<TEXT/IMAGE> columns.
-C<< $dbh->{LongReadLen} >> will also not work with FreeTDS use:
+Setting C<< $dbh->{LongReadLen} >> will also not work with FreeTDS use either:
+
+ $schema->storage->dbh->do("SET TEXTSIZE $bytes");
- $schema->storage->dbh->do("SET TEXTSIZE <bytes>")
+or
+
+ $schema->storage->set_textsize($bytes);
instead.
+However, the C<LongReadLen> you pass in
+L<DBIx::Class::Storage::DBI/connect_info> is used to execute the equivalent
+C<SET TEXTSIZE> command on connection.
+
See L</connect_call_blob_setup> for a L<DBIx::Class::Storage::DBI/connect_info>
setting you need to work with C<IMAGE> columns.
-=head1 AUTHORS
+=head1 AUTHOR
See L<DBIx::Class/CONTRIBUTORS>.
projects / dbsrgits/DBIx-Class.git / blobdiff