use strict;
use warnings;
-use Class::C3;
-use base qw/DBIx::Class::Storage::DBI/;
-
+use base qw/
+ DBIx::Class::Storage::DBI::Sybase::Base
+/;
+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/
+);
+
+=head1 NAME
+
+DBIx::Class::Storage::DBI::Sybase - Sybase support for DBIx::Class
+
+=head1 SYNOPSIS
+
+This subclass supports L<DBD::Sybase> for real Sybase databases. If you are
+using an MSSQL database via L<DBD::Sybase>, your storage will be reblessed to
+L<DBIx::Class::Storage::DBI::Sybase::Microsoft_SQL_Server>.
+
+=head1 DESCRIPTION
+
+If your version of Sybase does not support placeholders, then your storage
+will be reblessed to L<DBIx::Class::Storage::DBI::Sybase::NoBindVars>. You can
+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.
+
+A recommended L<DBIx::Class::Storage::DBI/connect_info> setting:
+
+ on_connect_call => [['datetime_setup'], ['blob_setup', log_on_update => 0]]
+
+=head1 METHODS
+
+=cut
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->last_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;
- } elsif (not $self->dbh->{syb_dynamic_supported}) {
- bless $self, 'DBIx::Class::Storage:DBI::Sybase::NoBindVars';
- $self->_rebless;
+ } 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};
+
+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 $self->placeholders_with_type_conversion_supported) {
+ if ($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->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;
+ }
+
+ $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');
+ }
+ }
+}
+
+=head2 connect_call_blob_setup
+
+Used as:
+
+ 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.
+
+Recommended.
+
+Also sets the C<log_on_update> value for blob write operations. The default is
+C<1>, but C<0> is better if your database is configured for it.
+
+See
+L<DBD::Sybase/Handling_IMAGE/TEXT_data_with_syb_ct_get_data()/syb_ct_send_data()>.
+
+=cut
+
+sub connect_call_blob_setup {
+ my $self = shift;
+ my %args = @_;
+ my $dbh = $self->_dbh;
+ $dbh->{syb_binary_images} = 1;
+
+ $self->_blob_log_on_update($args{log_on_update})
+ if exists $args{log_on_update};
+}
+
+=head2 connect_call_set_auto_cast
+
+In some configurations (usually with L</FreeTDS>) statements with values bound
+to columns or conditions that are not strings will throw implicit type
+conversion errors. For L</FreeTDS> this is automatically detected, and this
+option is set.
+
+It converts placeholders to:
+
+ CAST(? as $type)
+
+the type is taken from the L<DBIx::Class::ResultSource/data_type> setting from
+your Result class, and mapped to a Sybase type using a mapping based on
+L<SQL::Translator> if necessary.
+
+This setting can also be set outside of
+L<DBIx::Class::Storage::DBI/connect_info> at any time using:
+
+ $schema->storage->auto_cast(1);
+
+=cut
+
+sub connect_call_set_auto_cast {
+ my $self = shift;
+ $self->auto_cast(1);
+}
+
+sub _is_lob_type {
+ my $self = shift;
+ my $type = shift;
+ $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 %$bind_info);
+
+ if ($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}
+ } $ident->columns;
+ }
+
+ if ($identity_col) {
+ $sql =
+ "$sql\n" .
+ $self->_fetch_identity_sql($ident, $identity_col);
}
}
+
+ return ($sql, $bind);
+}
+
+# Stolen from SQLT, with some modifications. This will likely change when the
+# SQLT Sybase stuff is redone/fixed-up.
+my %TYPE_MAPPING = (
+ number => 'numeric',
+ money => 'money',
+ varchar => 'varchar',
+ varchar2 => 'varchar',
+ timestamp => 'datetime',
+ text => 'varchar',
+ real => 'double precision',
+ comment => 'text',
+ bit => 'bit',
+ tinyint => 'smallint',
+ float => 'double precision',
+ serial => 'numeric',
+ bigserial => 'numeric',
+ boolean => 'varchar',
+ long => 'varchar',
+);
+
+sub _syb_base_type {
+ my ($self, $type) = @_;
+
+ $type = lc $type;
+ $type =~ s/ identity//;
+
+ return uc($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) : $rv;
+}
+
+sub last_insert_id { shift->_identity }
+
+# override to handle TEXT/IMAGE and to do a transaction if necessary
+sub insert {
+ my ($self, $source, $to_insert) = splice @_, 0, 3;
+ my $dbh = $self->_dbh;
+
+ 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.
+ 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, @_);
+ }
+ };
+
+ $self->_insert_blobs($source, $blob_cols, $to_insert) if %$blob_cols;
+
+ return $updated_cols;
+}
+
+sub update {
+ my ($self, $source) = splice @_, 0, 2;
+ my ($fields, $where) = @_;
+ my $wantarray = wantarray;
+
+ my $blob_cols = $self->_remove_blob_cols($source, $fields);
+
+ my @res;
+ if ($wantarray) {
+ @res = $self->next::method($source, @_);
+ } else {
+ $res[0] = $self->next::method($source, @_);
+ }
+
+ $self->_update_blobs($source, $blob_cols, $where) if %$blob_cols;
+
+ return $wantarray ? @res : $res[0];
+}
+
+sub _remove_blob_cols {
+ my ($self, $source, $fields) = @_;
+
+ my %blob_cols;
+
+ for my $col (keys %$fields) {
+ if ($self->_is_lob_type($source->column_info($col)->{data_type})) {
+ $blob_cols{$col} = delete $fields->{$col};
+ $fields->{$col} = \"''";
+ }
+ }
+
+ return \%blob_cols;
+}
+
+sub _update_blobs {
+ 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->dbh;
+
+ my $table = $source->from;
+
+ my %row = %$row;
+ my (@primary_cols) = $source->primary_columns;
+
+ croak "Cannot update TEXT/IMAGE column(s) without a primary key"
+ unless @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};
+
+ my %where = map { ($_, $row{$_}) } @primary_cols;
+ my $cursor = $source->resultset->search(\%where, {
+ select => [$col]
+ })->cursor;
+ $cursor->next;
+ my $sth = $cursor->sth;
+
+ eval {
+ 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;
+ $log_on_update = 1 if not defined $log_on_update;
+
+ $sth->func('CS_SET', 1, {
+ total_txtlen => length($blob),
+ log_on_update => $log_on_update
+ }, 'ct_data_info') or die $sth->errstr;
+
+ $sth->func($blob, length($blob), 'ct_send_data') or die $sth->errstr;
+
+ $sth->func('ct_finish_send') or die $sth->errstr;
+ };
+ my $exception = $@;
+ $sth->finish if $sth;
+ if ($exception) {
+ if ($self->using_freetds) {
+ croak
+"TEXT/IMAGE operation failed, probably because you're using FreeTDS: " .
+$exception;
+ } else {
+ croak $exception;
+ }
+ }
+ }
+}
+
+=head2 connect_call_datetime_setup
+
+Used as:
+
+ on_connect_call => 'datetime_setup'
+
+In L<DBIx::Class::Storage::DBI/connect_info> to set:
+
+ $dbh->syb_date_fmt('ISO_strict'); # output fmt: 2004-08-21T14:36:48.080Z
+ $dbh->do('set dateformat mdy'); # input fmt: 08/13/1979 18:08:55.080
+
+On connection for use with L<DBIx::Class::InflateColumn::DateTime>, using
+L<DateTime::Format::Sybase>, which you will need to install.
+
+This works for both C<DATETIME> and C<SMALLDATETIME> columns, although
+C<SMALLDATETIME> columns only have minute precision.
+
+=cut
+
{
my $old_dbd_warned = 0;
- sub _populate_dbh {
+ sub connect_call_datetime_setup {
my $self = shift;
- $self->next::method(@_);
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');
+ $dbh->do('SET DATEFORMAT mdy');
1;
}
}
-sub _dbh_last_insert_id {
- my ($self, $dbh, $source, $col) = @_;
+sub datetime_parser_type { "DateTime::Format::Sybase" }
- # sorry, there's no other way!
- my $sth = $dbh->prepare_cached("select max($col) from ".$source->from);
- return ($dbh->selectrow_array($sth))[0];
-}
+# ->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 count {
+sub _dbh_begin_work {
my $self = shift;
- my ($source, $attrs) = @_;
+ $self->next::method(@_);
+ if ($self->using_freetds) {
+ $self->dbh->do('BEGIN TRAN');
+ }
+}
- if (not exists $attrs->{rows}) {
- return $self->next::method(@_);
+sub _dbh_commit {
+ my $self = shift;
+ if ($self->using_freetds) {
+ $self->_dbh->do('COMMIT');
}
+ return $self->next::method(@_);
+}
- my $offset = $attrs->{offset} || 0;
- my $total = $attrs->{rows} + $offset;
+sub _dbh_rollback {
+ my $self = shift;
+ if ($self->using_freetds) {
+ $self->_dbh->do('ROLLBACK');
+ }
+ return $self->next::method(@_);
+}
- my $new_attrs = $self->_trim_attributes_for_count($source, $attrs);
- $new_attrs->{select} = '1';
- $new_attrs->{as} = ['dummy'];
+# savepoint support using ASE syntax
- my $tmp_rs = $source->resultset_class->new($source, $new_attrs);
+sub _svp_begin {
+ my ($self, $name) = @_;
- $self->dbh->{syb_rowcount} = $total;
+ $self->dbh->do("SAVE TRANSACTION $name");
+}
- my $count = 0;
- $count++ while $tmp_rs->cursor->next;
+# A new SAVE TRANSACTION with the same name releases the previous one.
+sub _svp_release { 1 }
- $self->dbh->{syb_rowcount} = 0;
+sub _svp_rollback {
+ my ($self, $name) = @_;
- return $count - $offset;
+ $self->dbh->do("ROLLBACK TRANSACTION $name");
}
-sub datetime_parser_type { "DBIx::Class::Storage::DBI::Sybase::DateTime" }
-
1;
-=head1 NAME
+=head1 Schema::Loader Support
-DBIx::Class::Storage::DBI::Sybase - Storage::DBI subclass for Sybase
+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.
-=head1 SYNOPSIS
+It is available via subversion from:
-This subclass supports L<DBD::Sybase> for real Sybase databases. If you are
-using an MSSQL database via L<DBD::Sybase>, your storage will be reblessed to
-L<DBIx::Class::Storage::DBI::Sybase::Microsoft_SQL_Server>.
+ http://dev.catalyst.perl.org/repos/bast/branches/DBIx-Class-Schema-Loader/mssql_tweaks
-=head1 DESCRIPTION
+=head1 FreeTDS
-If your version of Sybase does not support placeholders, then your storage
-will be reblessed to L<DBIx::Class::Storage::DBI::Sybase::NoBindVars>. You can
-also enable that driver explicitly, see the documentation for more details.
+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:
-With this driver there is unfortunately no way to get the C<last_insert_id>
-without doing a C<select max(col)>.
+The Open Client FAQ is here:
+L<http://www.isug.com/Sybase_FAQ/ASE/section7.html>.
-But your queries will be cached.
+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
+conversion errors for anything that's not expecting a string. In such a case,
+the C<auto_cast> option is automatically set, which you may enable yourself with
+L</connect_call_set_auto_cast> (see the description of that method for more
+details.)
+
+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 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
-On connection C<syb_date_fmt> is set to C<ISO_strict>, e.g.:
-C<2004-08-21T14:36:48.080Z> and C<dateformat> is set to C<mdy>, e.g.:
-C<08/13/1979 18:08:55.080>.
+See L</connect_call_datetime_setup> to setup date formats
+for L<DBIx::Class::InflateColumn::DateTime>.
-This works for both C<DATETIME> and C<SMALLDATETIME> columns, although
-C<SMALLDATETIME> columns only have minute precision.
+=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.
-You will need the L<DateTime::Format::Strptime> module if you are going to use
-L<DBIx::Class::InflateColumn::DateTime>.
+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
projects / dbsrgits/DBIx-Class.git / blobdiff