1 package DBIx::Class::Storage::DBI::Sybase;
7 use base qw/DBIx::Class::Storage::DBI/;
9 use Carp::Clan qw/^DBIx::Class/;
13 DBIx::Class::Storage::DBI::Sybase - Storage::DBI subclass for Sybase
17 This subclass supports L<DBD::Sybase> for real Sybase databases. If you are
18 using an MSSQL database via L<DBD::Sybase>, your storage will be reblessed to
19 L<DBIx::Class::Storage::DBI::Sybase::Microsoft_SQL_Server>.
23 If your version of Sybase does not support placeholders, then your storage
24 will be reblessed to L<DBIx::Class::Storage::DBI::Sybase::NoBindVars>. You can
25 also enable that driver explicitly, see the documentation for more details.
27 With this driver there is unfortunately no way to get the C<last_insert_id>
28 without doing a C<select max(col)>.
30 But your queries will be cached.
32 A recommended L<DBIx::Class::Storage::DBI/connect_info> settings:
34 on_connect_call => [['datetime_setup'], [blob_setup => log_on_update => 0]]
40 __PACKAGE__->mk_group_accessors('simple' =>
41 qw/_blob_log_on_update/
47 if (ref($self) eq 'DBIx::Class::Storage::DBI::Sybase') {
49 @{$self->dbh->selectrow_arrayref(qq{sp_server_info \@attribute_id=1})}[2]
54 my $subclass = "DBIx::Class::Storage::DBI::Sybase::${dbtype}";
56 if (!$exception && $dbtype && $self->load_optional_class($subclass)) {
57 bless $self, $subclass;
61 if (not $self->dbh->{syb_dynamic_supported}) {
62 bless $self, 'DBIx::Class::Storage:DBI::Sybase::NoBindVars';
69 =head2 connect_call_blob_setup
73 on_connect_call => [ [ blob_setup => log_on_update => 0 ] ]
75 Does C<< $dbh->{syb_binary_images} = 1; >> to return C<IMAGE> data as raw binary
76 instead of as a hex string.
80 Also sets the C<log_on_update> value for blob write operations. The default is
81 C<1>, but C<0> is better if your database is configured for it.
84 L<DBD::Sybase/Handling_IMAGE/TEXT_data_with_syb_ct_get_data()/syb_ct_send_data()>.
88 sub connect_call_blob_setup {
91 my $dbh = $self->_dbh;
92 $dbh->{syb_binary_images} = 1;
94 $self->_blob_log_on_update($args{log_on_update})
95 if exists $args{log_on_update};
100 shift =~ /(?:text|image|lob|bytea|binary)/i;
104 my ($self, $source, $to_insert) = splice @_, 0, 3;
106 my $blob_cols = $self->_remove_blob_cols($source, $to_insert);
108 my $updated_cols = $self->next::method($source, $to_insert, @_);
110 $self->_update_blobs($source, $blob_cols, $to_insert) if %$blob_cols;
112 return $updated_cols;
116 # my ($self, $source) = splice @_, 0, 2;
119 # my $blob_cols = $self->_remove_blob_cols($source, $fields);
125 # @res = $self->next::method($source, @_);
127 # $res[0] = $self->next::method($source, @_);
131 # $self->_update_blobs($source, $blob_cols, $fields) if %$blob_cols;
133 # return wantarray ? @res : $res[0];
136 sub _remove_blob_cols {
137 my ($self, $source, $fields) = @_;
141 for my $col (keys %$fields) {
142 $blob_cols{$col} = delete $fields->{$col}
143 if $self->_is_lob_type($source->column_info($col)->{data_type});
150 my ($self, $source, $blob_cols, $inserted) = @_;
151 my $dbh = $self->dbh;
153 my $table = $source->from;
155 my (@primary_cols) = $source->primary_columns;
157 croak "Cannot update TEXT/IMAGE without a primary key!"
158 unless @primary_cols;
160 my $search_cond = join ',' => map "$_ = ?", @primary_cols;
162 for my $col (keys %$blob_cols) {
163 my $blob = $blob_cols->{$col};
165 # First update to empty string in case it's NULL, can't update a NULL blob using
167 my $sth = $dbh->prepare_cached(
168 qq{update $table set $col = '' where $search_cond}
170 $sth->execute(map $inserted->{$_}, @primary_cols) or die $sth->errstr;
173 $sth = $dbh->prepare_cached(
174 "select $col from $table where $search_cond"
176 $sth->execute(map $inserted->{$_}, @primary_cols);
179 while ($sth->fetch) {
180 $sth->func('CS_GET', 1, 'ct_data_info') or die $sth->errstr;
182 $sth->func('ct_prepare_send') or die $sth->errstr;
184 my $log_on_update = $self->_blob_log_on_update;
185 $log_on_update = 1 if not defined $log_on_update;
187 $sth->func('CS_SET', 1, {
188 total_txtlen => length($blob),
189 log_on_update => $log_on_update
190 }, 'ct_data_info') or die $sth->errstr;
192 $sth->func($blob, length($blob), 'ct_send_data') or die $sth->errstr;
194 $sth->func('ct_finish_send') or die $sth->errstr;
198 croak $exception if $exception;
202 =head2 connect_call_datetime_setup
206 on_connect_call => 'datetime_setup'
208 In L<DBIx::Class::Storage::DBI/connect_info> to set:
210 $dbh->syb_date_fmt('ISO_strict'); # output fmt: 2004-08-21T14:36:48.080Z
211 $dbh->do('set dateformat mdy'); # input fmt: 08/13/1979 18:08:55.080
213 On connection for use with L<DBIx::Class::InflateColumn::DateTime>, using
214 L<DateTime::Format::Sybase>, which you will need to install.
216 This works for both C<DATETIME> and C<SMALLDATETIME> columns, although
217 C<SMALLDATETIME> columns only have minute precision.
222 my $old_dbd_warned = 0;
224 sub connect_call_datetime_setup {
226 my $dbh = $self->_dbh;
228 if ($dbh->can('syb_date_fmt')) {
229 $dbh->syb_date_fmt('ISO_strict');
230 } elsif (not $old_dbd_warned) {
231 carp "Your DBD::Sybase is too old to support ".
232 "DBIx::Class::InflateColumn::DateTime, please upgrade!";
236 $dbh->do('set dateformat mdy');
242 sub datetime_parser_type { "DateTime::Format::Sybase" }
244 sub _dbh_last_insert_id {
245 my ($self, $dbh, $source, $col) = @_;
247 # sorry, there's no other way!
248 my $sth = $dbh->prepare_cached("select max($col) from ".$source->from);
249 return ($dbh->selectrow_array($sth))[0];
252 # previous implementation of limited count for Sybase, does not include
255 #sub _copy_attributes_for_count {
256 # my ($self, $source, $attrs) = @_;
257 # my %attrs = %$attrs;
259 # # take off any column specs, any pagers, record_filter is cdbi, and no point of ordering a count
260 # delete @attrs{qw/select as rows offset page order_by record_filter/};
267 #Counts for limited queries are emulated by executing select queries and
268 #returning the number of successful executions minus the offset.
270 #This is necessary due to the limitations of Sybase.
276 # my ($source, $attrs) = @_;
278 # my $new_attrs = $self->_copy_attributes_for_count($source, $attrs);
280 # if (exists $attrs->{rows}) {
281 # my $offset = $attrs->{offset} || 0;
282 # my $total = $attrs->{rows} + $offset;
284 # my $first_pk = ($source->primary_columns)[0];
286 # $new_attrs->{select} = $first_pk ? "me.$first_pk" : 1;
288 # my $tmp_rs = $source->resultset_class->new($source, $new_attrs);
290 # $self->dbh->{syb_rowcount} = $total;
293 # $count++ while $tmp_rs->cursor->next;
295 # $self->dbh->{syb_rowcount} = 0;
297 # return $count - $offset;
299 # # overwrite the selector
300 # $new_attrs->{select} = { count => '*' };
302 # my $tmp_rs = $source->resultset_class->new($source, $new_attrs);
303 # my ($count) = $tmp_rs->cursor->next;
305 # # if the offset/rows attributes are still present, we did not use
306 # # a subquery, so we need to make the calculations in software
307 # $count -= $attrs->{offset} if $attrs->{offset};
308 # $count = $attrs->{rows} if $attrs->{rows} and $attrs->{rows} < $count;
309 # $count = 0 if ($count < 0);
319 See L</connect_call_datetime_setup> to setup date formats
320 for L<DBIx::Class::InflateColumn::DateTime>.
322 =head1 IMAGE AND TEXT COLUMNS
324 See L</connect_call_blob_setup> for a L<DBIx::Class::Storage::DBI/connect_info>
325 setting you need to work with C<IMAGE> columns.
327 Due to limitations in L<DBD::Sybase> and this driver, it is only possible to
328 select one C<TEXT> or C<IMAGE> column at a time.
332 See L<DBIx::Class/CONTRIBUTORS>.
336 You may distribute this code under the same terms as Perl itself.