use strict;
use warnings;
-use mro 'c3';
+
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 unsafe_insert _insert_dbh/
+);
=head1 NAME
-DBIx::Class::Storage::DBI::Sybase - Storage::DBI subclass for Sybase
+DBIx::Class::Storage::DBI::Sybase - Sybase support for DBIx::Class
=head1 SYNOPSIS
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)>.
+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.
-A recommended L<DBIx::Class::Storage::DBI/connect_info> settings:
+A recommended L<DBIx::Class::Storage::DBI/connect_info> setting:
- on_connect_call => [['datetime_setup'], [blob_setup => log_on_update => 0]]
+ on_connect_call => [['datetime_setup'], ['blob_setup', log_on_update => 0]]
=head1 METHODS
=cut
-__PACKAGE__->mk_group_accessors('simple' =>
- qw/_blob_log_on_update/
-);
-
sub _rebless {
my $self = shift;
if (ref($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 = $@;
if (!$exception && $dbtype && $self->load_optional_class($subclass)) {
bless $self, $subclass;
$self->_rebless;
- } else {
- # real Sybase
- if (not $self->dbh->{syb_dynamic_supported}) {
- bless $self, 'DBIx::Class::Storage:DBI::Sybase::NoBindVars';
+ } else { # real Sybase
+ my $no_bind_vars = 'DBIx::Class::Storage::DBI::Sybase::NoBindVars';
+
+ if ($self->using_freetds) {
+ carp <<'EOF' unless $ENV{DBIC_SYBASE_FREETDS_NOWARN};
+
+You are using FreeTDS with Sybase.
+
+We will do our best to support this configuration, but please consider this
+support experimental.
+
+TEXT/IMAGE columns will definitely not work.
+
+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 $self->_typeless_placeholders_supported) {
+ if ($self->_placeholders_supported) {
+ $self->auto_cast(1);
+ } else {
+ $self->ensure_class_loaded($no_bind_vars);
+ bless $self, $no_bind_vars;
+ $self->_rebless;
+ }
+ }
+
+ $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);
}
}
}
+# Make sure we have CHAINED mode turned on if AutoCommit is off in non-FreeTDS
+# DBD::Sybase (since we don't know how DBD::Sybase was compiled.) If however
+# we're using FreeTDS, CHAINED mode turns on an implicit transaction which we
+# only want when AutoCommit is off.
+sub _populate_dbh {
+ my $self = shift;
+
+ $self->next::method(@_);
+
+ if (not $self->using_freetds) {
+ $self->_dbh->{syb_chained_txn} = 1;
+ } else {
+ if ($self->_dbh_autocommit) {
+ $self->_dbh->do('SET CHAINED OFF');
+ } else {
+ $self->_dbh->do('SET CHAINED ON');
+ }
+ }
+
+ $self->_insert_dbh($self->_connect(@{ $self->_dbi_connect_info }));
+}
+
=head2 connect_call_blob_setup
Used as:
- on_connect_call => [ [ blob_setup => log_on_update => 0 ] ]
+ on_connect_call => [ [ 'blob_setup', log_on_update => 0 ] ]
Does C<< $dbh->{syb_binary_images} = 1; >> to return C<IMAGE> data as raw binary
instead of as a hex string.
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->unsafe_insert(0|1);
+
+=cut
+
+sub connect_call_unsafe_insert {
+ my $self = shift;
+ $self->unsafe_insert(1);
+}
+
sub _is_lob_type {
my $self = shift;
- shift =~ /(?:text|image|lob|bytea|binary)/i;
+ my $type = shift;
+ $type && $type =~ /(?:text|image|lob|bytea|binary|memo)/i;
+}
+
+sub _prep_for_execute {
+ my $self = shift;
+ my ($op, $extra_bind, $ident, $args) = @_;
+
+ my ($sql, $bind) = $self->next::method (@_);
+
+ if ($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 %$bind_info)
+ ;
+
+ if ($identity_col) {
+ $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) {
+ $sql =
+ "$sql\n" .
+ $self->_fetch_identity_sql($ident, $identity_col);
+ }
+ }
+
+ return ($sql, $bind);
}
+# Stolen from SQLT, with some modifications. This is a makeshift
+# solution before a sane type-mapping library is available, thus
+# the 'our' for easy overrides.
+our %TYPE_MAPPING = (
+ number => 'numeric',
+ money => 'money',
+ varchar => 'varchar',
+ varchar2 => 'varchar',
+ timestamp => 'datetime',
+ text => 'varchar',
+ real => 'double precision',
+ comment => 'text',
+ bit => 'bit',
+ tinyint => 'smallint',
+ float => 'double precision',
+ serial => 'numeric',
+ bigserial => 'numeric',
+ boolean => 'varchar',
+ long => 'varchar',
+);
+
+sub _native_data_type {
+ my ($self, $type) = @_;
+
+ $type = lc $type;
+ $type =~ s/\s* identity//x;
+
+ return uc($TYPE_MAPPING{$type} || $type);
+}
+
+sub _fetch_identity_sql {
+ my ($self, $source, $col) = @_;
+
+ return "SELECT MAX($col) FROM ".$source->from;
+}
+
+sub _execute {
+ my $self = shift;
+ my ($op) = @_;
+
+ my ($rv, $sth, @bind) = $self->dbh_do($self->can('_dbh_execute'), @_);
+
+ if ($op eq 'insert') {
+ $self->_identity($sth->fetchrow_array);
+ $sth->finish;
+ }
+
+ return wantarray ? ($rv, $sth, @bind) : $rv;
+}
+
+sub last_insert_id { shift->_identity }
+
+# handles TEXT/IMAGE and transaction for last_insert_id
sub insert {
- my ($self, $source, $to_insert) = splice @_, 0, 3;
+ my $self = shift;
+ my ($source, $to_insert) = @_;
my $blob_cols = $self->_remove_blob_cols($source, $to_insert);
- my $updated_cols = $self->next::method($source, $to_insert, @_);
+# insert+blob insert done atomically
+ my $guard = $self->txn_scope_guard 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 (
+ $need_last_insert_id && !$self->unsafe_insert && !$self->{transaction_depth}
+ ) {
+ local $self->{_dbh} = $self->_insert_dbh;
+ my $guard = $self->txn_scope_guard;
+ 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;
- $self->_update_blobs($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) = @_;
-#
-# my $blob_cols = $self->_remove_blob_cols($source, $fields);
-#
-# my @res = 1;
-#
-# if (%$fields) {
-# if (wantarray) {
-# @res = $self->next::method($source, @_);
-# } else {
-# $res[0] = $self->next::method($source, @_);
-# }
-# }
-#
-# $self->_update_blobs($source, $blob_cols, $fields) if %$blob_cols;
-#
-# return wantarray ? @res : $res[0];
-#}
+sub update {
+ 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(@_);
+ }
+ elsif (defined $wantarray) {
+ $res[0] = $self->next::method(@_);
+ }
+ else {
+ $self->next::method(@_);
+ }
+
+ $self->_update_blobs($source, $blob_cols, $where) if $blob_cols;
+
+ $guard->commit if $guard;
+
+ return $wantarray ? @res : $res[0];
+}
sub _remove_blob_cols {
my ($self, $source, $fields) = @_;
my %blob_cols;
for my $col (keys %$fields) {
- $blob_cols{$col} = delete $fields->{$col}
- if $self->_is_lob_type($source->column_info($col)->{data_type});
+ if ($self->_is_lob_type($source->column_info($col)->{data_type})) {
+ $blob_cols{$col} = delete $fields->{$col};
+ $fields->{$col} = \"''";
+ }
}
- return \%blob_cols;
+ return keys %blob_cols ? \%blob_cols : undef;
}
sub _update_blobs {
- my ($self, $source, $blob_cols, $inserted) = @_;
- my $dbh = $self->dbh;
+ my ($self, $source, $blob_cols, $where) = @_;
+
+ my (@primary_cols) = $source->primary_columns;
+
+ croak "Cannot update TEXT/IMAGE column(s) without a primary key"
+ unless @primary_cols;
+
+# check if we're updating a single row by PK
+ my $pk_cols_in_where = 0;
+ for my $col (@primary_cols) {
+ $pk_cols_in_where++ if defined $where->{$col};
+ }
+ my @rows;
+
+ if ($pk_cols_in_where == @primary_cols) {
+ my %row_to_update;
+ @row_to_update{@primary_cols} = @{$where}{@primary_cols};
+ @rows = \%row_to_update;
+ } else {
+ my $rs = $source->resultset->search(
+ $where,
+ {
+ result_class => 'DBIx::Class::ResultClass::HashRefInflator',
+ select => \@primary_cols
+ }
+ );
+ @rows = $rs->all; # statement must finish
+ }
+
+ for my $row (@rows) {
+ $self->_insert_blobs($source, $blob_cols, $row);
+ }
+}
+
+sub _insert_blobs {
+ my ($self, $source, $blob_cols, $row) = @_;
+ my $dbh = $self->_get_dbh;
my $table = $source->from;
+ my %row = %$row;
my (@primary_cols) = $source->primary_columns;
- croak "Cannot update TEXT/IMAGE without a primary key!"
+ croak "Cannot update TEXT/IMAGE column(s) without a primary key"
unless @primary_cols;
- my $search_cond = join ',' => map "$_ = ?", @primary_cols;
+ if ((grep { defined $row{$_} } @primary_cols) != @primary_cols) {
+ if (@primary_cols == 1) {
+ my $col = $primary_cols[0];
+ $row{$col} = $self->last_insert_id($source, $col);
+ } else {
+ croak "Cannot update TEXT/IMAGE column(s) without primary key values";
+ }
+ }
for my $col (keys %$blob_cols) {
my $blob = $blob_cols->{$col};
-# First update to empty string in case it's NULL, can't update a NULL blob using
-# the API.
- my $sth = $dbh->prepare_cached(
- qq{update $table set $col = '' where $search_cond}
- );
- $sth->execute(map $inserted->{$_}, @primary_cols) or die $sth->errstr;
- $sth->finish;
-
- $sth = $dbh->prepare_cached(
- "select $col from $table where $search_cond"
- );
- $sth->execute(map $inserted->{$_}, @primary_cols);
+ my %where = map { ($_, $row{$_}) } @primary_cols;
+ my $cursor = $source->resultset->search(\%where, {
+ select => [$col]
+ })->cursor;
+ $cursor->next;
+ my $sth = $cursor->sth;
eval {
- while ($sth->fetch) {
+ do {
$sth->func('CS_GET', 1, 'ct_data_info') or die $sth->errstr;
- }
+ } while $sth->fetch;
+
$sth->func('ct_prepare_send') or die $sth->errstr;
my $log_on_update = $self->_blob_log_on_update;
$sth->func('ct_finish_send') or die $sth->errstr;
};
my $exception = $@;
- $sth->finish;
- croak $exception if $exception;
+ $sth->finish if $sth;
+ if ($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');
+ $dbh->do('SET DATEFORMAT mdy');
1;
}
sub datetime_parser_type { "DateTime::Format::Sybase" }
-sub _dbh_last_insert_id {
- my ($self, $dbh, $source, $col) = @_;
+# ->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;
+ $self->next::method(@_);
+ if ($self->using_freetds) {
+ $self->_get_dbh->do('BEGIN TRAN');
+ }
+}
+
+sub _dbh_commit {
+ my $self = shift;
+ if ($self->using_freetds) {
+ $self->_dbh->do('COMMIT');
+ }
+ return $self->next::method(@_);
+}
+
+sub _dbh_rollback {
+ my $self = shift;
+ if ($self->using_freetds) {
+ $self->_dbh->do('ROLLBACK');
+ }
+ return $self->next::method(@_);
+}
+
+# savepoint support using ASE syntax
+
+sub _svp_begin {
+ my ($self, $name) = @_;
- # sorry, there's no other way!
- my $sth = $dbh->prepare_cached("select max($col) from ".$source->from);
- return ($dbh->selectrow_array($sth))[0];
+ $self->_get_dbh->do("SAVE TRANSACTION $name");
+}
+
+# A new SAVE TRANSACTION with the same name releases the previous one.
+sub _svp_release { 1 }
+
+sub _svp_rollback {
+ my ($self, $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 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>.
+
+Transactions done for inserts in C<AutoCommit> mode when placeholders are in use
+are also affected, so this won't work:
+
+ while (my $row = $rs1->next) {
+ $rs2->create({ foo => $row->foo });
+ }
+
+Some workarounds:
+
+=over 4
+
+=item * set C<< $schema->storage->unsafe_insert(1) >> temporarily (see
+L</connect_call_unsafe_insert>)
+
+=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>
+
+=item * enlarge the scope of the transaction
+
+=back
+
+=head1 MAXIMUM CONNECTIONS
+
+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 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>
+for information on changing the setting on the server side.
+
=head1 DATES
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.
+
+Setting C<< $dbh->{LongReadLen} >> will also not work with FreeTDS use either:
+
+ $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.
-Due to limitations in L<DBD::Sybase> and this driver, it is only possible to
-select one C<TEXT> or C<IMAGE> column at a time.
-
-=head1 AUTHORS
+=head1 AUTHOR
See L<DBIx::Class/CONTRIBUTORS>.