use strict;
use warnings;
-use base qw/
- DBIx::Class::Storage::DBI::Sybase::Base
- DBIx::Class::Storage::DBI
-/;
-use mro 'c3';
-use Carp::Clan qw/^DBIx::Class/;
-use List::Util ();
-
-__PACKAGE__->mk_group_accessors('simple' =>
- qw/_identity _blob_log_on_update/
-);
+use base qw/DBIx::Class::Storage::DBI/;
=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>.
+DBIx::Class::Storage::DBI::Sybase - Base class for drivers using
+L<DBD::Sybase>
=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.
-
-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>.
-
-A recommended L<DBIx::Class::Storage::DBI/connect_info> setting:
-
- on_connect_call => [['datetime_setup'], ['blob_setup', log_on_update => 0]]
+This is the base class/dispatcher for Storage's designed to work with
+L<DBD::Sybase>
=head1 METHODS
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]
- } || '';
+ my $dbtype = eval {
+ @{$self->_get_dbh->selectrow_arrayref(qq{sp_server_info \@attribute_id=1})}[2]
+ };
- my $exception = $@;
+ $self->throw_exception("Unable to estable connection to determine database type: $@")
+ if $@;
+
+ if ($dbtype) {
$dbtype =~ s/\W/_/gi;
- my $subclass = "DBIx::Class::Storage::DBI::Sybase::${dbtype}";
- if (!$exception && $dbtype && $self->load_optional_class($subclass)) {
+ # saner class name
+ $dbtype = 'ASE' if $dbtype eq 'SQL_Server';
+
+ my $subclass = __PACKAGE__ . "::$dbtype";
+ if ($self->load_optional_class($subclass)) {
bless $self, $subclass;
$self->_rebless;
- } else { # real Sybase
- my $no_bind_vars = 'DBIx::Class::Storage::DBI::Sybase::NoBindVars';
-
- if ($self->_using_freetds) {
- carp <<'EOF';
-
-Your version of Sybase potentially supports placeholders and query caching,
-however you seem to be using FreeTDS which does not (yet?) support this.
-
-Please recompile DBD::Sybase with the Sybase OpenClient libraries if you want
-these features.
-
-TEXT/IMAGE column support will also not work under FreeTDS.
-
-See perldoc DBIx::Class::Storage::DBI::Sybase for more details.
-EOF
- $self->ensure_class_loaded($no_bind_vars);
- bless $self, $no_bind_vars;
- $self->_rebless;
- }
-
- if (not $self->dbh->{syb_dynamic_supported}) {
- $self->ensure_class_loaded($no_bind_vars);
- bless $self, $no_bind_vars;
- $self->_rebless;
- }
-
- $self->_set_maxConnect;
}
}
}
-# Make sure we have CHAINED mode turned on, we don't know how DBD::Sybase was
-# compiled.
-sub _populate_dbh {
+sub _ping {
my $self = shift;
- $self->next::method(@_);
- $self->_dbh->{syb_chained_txn} = 1;
-}
-sub _using_freetds {
- my $self = shift;
+ my $dbh = $self->_dbh or return 0;
+
+ local $dbh->{RaiseError} = 1;
+ local $dbh->{PrintError} = 0;
+
+ if ($dbh->{syb_no_child_con}) {
+# if extra connections are not allowed, then ->ping is reliable
+ my $ping = eval { $dbh->ping };
+ return $@ ? 0 : $ping;
+ }
- return $self->_dbh->{syb_oc_version} =~ /freetds/i;
+ eval {
+# XXX if the main connection goes stale, does opening another for this statement
+# really determine anything?
+ $dbh->do('select 1');
+ };
+
+ return $@ ? 0 : 1;
}
-sub _set_maxConnect {
+sub _set_max_connect {
my $self = shift;
+ my $val = shift || 256;
my $dsn = $self->_dbi_connect_info->[0];
return if ref($dsn) eq 'CODE';
if ($dsn !~ /maxConnect=/) {
- $self->_dbi_connect_info->[0] = "$dsn;maxConnect=256";
+ $self->_dbi_connect_info->[0] = "$dsn;maxConnect=$val";
my $connected = defined $self->_dbh;
$self->disconnect;
$self->ensure_connected if $connected;
}
}
-=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.
+=head2 using_freetds
-See
-L<DBD::Sybase/Handling_IMAGE/TEXT_data_with_syb_ct_get_data()/syb_ct_send_data()>.
+Whether or not L<DBD::Sybase> was compiled against FreeTDS. If false, it means
+the Sybase OpenClient libraries were used.
=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};
-}
-
-sub _is_lob_type {
- my $self = shift;
- my $type = shift;
- $type && $type =~ /(?:text|image|lob|bytea|binary|memo)/i;
-}
-
-## This will be useful if we ever implement BLOB filehandle inflation and will
-## need to use the API, but for now it isn't.
-#
-#sub order_columns_for_select {
-# my ($self, $source, $columns) = @_;
-#
-# my (@non_blobs, @blobs);
-#
-# for my $col (@$columns) {
-# if ($self->_is_lob_type($source->column_info($col)->{data_type})) {
-# push @blobs, $col;
-# } else {
-# push @non_blobs, $col;
-# }
-# }
-#
-# croak "cannot select more than a one TEXT/IMAGE column at a time"
-# if @blobs > 1;
-#
-# return (@non_blobs, @blobs);
-#}
-
-# the select-piggybacking-on-insert trick stolen from odbc/mssql
-sub _prep_for_execute {
+sub using_freetds {
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 =
-"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, $identity_col) . "\n";
- }
- }
-
- return ($sql, $bind);
-}
-
-sub _fetch_identity_sql {
- my ($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) : $rv;
-}
-
-sub last_insert_id { shift->_identity }
-
-# override to handle TEXT/IMAGE and nested txn
-sub insert {
- my ($self, $source, $to_insert) = splice @_, 0, 3;
- my $dbh = $self->_dbh;
-
- my $blob_cols = $self->_remove_blob_cols($source, $to_insert);
-
-# Sybase has savepoints fortunately, because 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 {
- local $self->{auto_savepoint} = 1;
- my $args = \@_;
- my $method = $self->next::can;
- $self->txn_do(
- sub { $self->$method($source, $to_insert, @$args) }
- );
- };
-
- $self->_insert_blobs($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 $sth;
-
- if (not $self->isa('DBIx::Class::Storage::DBI::NoBindVars')) {
- my $search_cond = join ',' => map "$_ = ?", @primary_cols;
-
- $sth = $self->sth(
- "select $col from $table where $search_cond"
- );
- $sth->execute(map $row{$_}, @primary_cols);
- } else {
- my $search_cond = join ',' => map "$_ = $row{$_}", @primary_cols;
-
- $sth = $dbh->prepare(
- "select $col from $table where $search_cond"
- );
- $sth->execute;
- }
-
- eval {
- while ($sth->fetch) {
- $sth->func('CS_GET', 1, 'ct_data_info') or die $sth->errstr;
- }
- $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;
- croak $exception if $exception;
- }
+ return $self->_get_dbh->{syb_oc_version} =~ /freetds/i;
}
-=head2 connect_call_datetime_setup
-
-Used as:
+=head2 set_textsize
- on_connect_call => 'datetime_setup'
+When using FreeTDS and/or MSSQL, C<< $dbh->{LongReadLen} >> is not available,
+use this function instead. It does:
-In L<DBIx::Class::Storage::DBI/connect_info> to set:
+ $dbh->do("SET TEXTSIZE $bytes");
- $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.
+Takes the number of bytes, or uses the C<LongReadLen> value from your
+L<connect_info|DBIx::Class::Storage::DBI/connect_info> if omitted, lastly falls
+back to the C<32768> which is the L<DBD::Sybase> default.
=cut
-{
- my $old_dbd_warned = 0;
-
- sub connect_call_datetime_setup {
- my $self = shift;
- my $dbh = $self->_dbh;
-
- if ($dbh->can('syb_date_fmt')) {
- $dbh->syb_date_fmt('ISO_strict');
- } elsif (not $old_dbd_warned) {
- carp "Your DBD::Sybase is too old to support ".
- "DBIx::Class::InflateColumn::DateTime, please upgrade!";
- $old_dbd_warned = 1;
- }
-
- $dbh->do('set dateformat mdy');
-
- 1;
- }
-}
-
-sub datetime_parser_type { "DateTime::Format::Sybase" }
-
-# savepoint support using ASE syntax
-
-sub _svp_begin {
- my ($self, $name) = @_;
-
- $self->dbh->do("SAVE TRANSACTION $name");
-}
-
-# A new SAVE TRANSACTION with the same name releases the previous one.
-sub _svp_release { 1 }
+sub set_textsize {
+ my $self = shift;
+ my $text_size = shift ||
+ eval { $self->_dbi_connect_info->[-1]->{LongReadLen} } ||
+ 32768; # the DBD::Sybase default
-sub _svp_rollback {
- my ($self, $name) = @_;
+ return unless defined $text_size;
- $self->dbh->do("ROLLBACK TRANSACTION $name");
+ $self->_dbh->do("SET TEXTSIZE $text_size");
}
1;
-=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.
-
-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.
-
-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
-
-L<DBD::Sybase> compiled with FreeTDS will B<NOT> work with C<TEXT/IMAGE>
-columns.
-
-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
See L<DBIx::Class/CONTRIBUTORS>.
You may distribute this code under the same terms as Perl itself.
=cut
-# vim:sts=2 sw=2: