X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FDBIx%2FClass%2FStorage%2FDBI%2FSybase.pm;h=9b1214c09e19d216dd546306234b667dcd098fa4;hb=52b420dd006f55aced42c669f49182890b8826ea;hp=7995334798ed7032ba006e16f3d0d22d445d1ad5;hpb=44e538d00c41e69899b48178c9dede95e2ef7e77;p=dbsrgits%2FDBIx-Class.git

diff --git a/lib/DBIx/Class/Storage/DBI/Sybase.pm b/lib/DBIx/Class/Storage/DBI/Sybase.pm
index 7995334..9b1214c 100644
--- a/lib/DBIx/Class/Storage/DBI/Sybase.pm
+++ b/lib/DBIx/Class/Storage/DBI/Sybase.pm
@@ -2,42 +2,19 @@ package DBIx::Class::Storage::DBI::Sybase;
 
 use strict;
 use warnings;
+use Try::Tiny;
 
-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/
-);
+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.
-
-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
 
@@ -46,594 +23,108 @@ A recommended L<DBIx::Class::Storage::DBI/connect_info> setting:
 sub _rebless {
   my $self = shift;
 
-  if (ref($self) eq 'DBIx::Class::Storage::DBI::Sybase') {
-    my $dbtype = eval {
-      @{$self->last_dbh->selectrow_arrayref(qq{sp_server_info \@attribute_id=1})}[2]
-    } || '';
+  my $dbtype;
+  try {
+    $dbtype = @{$self->_get_dbh->selectrow_arrayref(qq{sp_server_info \@attribute_id=1})}[2]
+  } catch {
+    $self->throw_exception("Unable to estable connection to determine database type: $_")
+  };
 
-    my $exception = $@;
+  if ($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';
-
-# 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 {
+sub _ping {
   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;
-  }
+  my $dbh = $self->_dbh or return 0;
 
-  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;
-    }
+  local $dbh->{RaiseError} = 1;
+  local $dbh->{PrintError} = 0;
 
-    if ($identity_col) {
-      $sql =
-        "$sql\n" .
-        $self->_fetch_identity_sql($ident, $identity_col);
-    }
+  if ($dbh->{syb_no_child_con}) {
+# if extra connections are not allowed, then ->ping is reliable
+    return try { $dbh->ping } catch { 0; };
   }
 
-  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, @_);
-    }
+  return try {
+# XXX if the main connection goes stale, does opening another for this statement
+# really determine anything?
+    $dbh->do('select 1');
+    1;
+  } catch {
+    0;
   };
-
-  $self->_insert_blobs($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) = @_;
+sub _set_max_connect {
+  my $self = shift;
+  my $val  = shift || 256;
 
-  my (@primary_cols) = $source->primary_columns;
+  my $dsn = $self->_dbi_connect_info->[0];
 
-  croak "Cannot update TEXT/IMAGE column(s) without a primary key"
-    unless @primary_cols;
+  return if ref($dsn) eq 'CODE';
 
-# 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, $row);
+  if ($dsn !~ /maxConnect=/) {
+    $self->_dbi_connect_info->[0] = "$dsn;maxConnect=$val";
+    my $connected = defined $self->_dbh;
+    $self->disconnect;
+    $self->ensure_connected if $connected;
   }
 }
 
-sub _insert_blobs {
-  my ($self, $source, $blob_cols, $row) = @_;
-  my $dbh = $self->dbh;
-
-  my $table = $source->from;
+=head2 using_freetds
 
-  my %row = %$row;
-  my (@primary_cols) = $source->primary_columns;
+Whether or not L<DBD::Sybase> was compiled against FreeTDS. If false, it means
+the Sybase OpenClient libraries were used.
 
-  croak "Cannot update TEXT/IMAGE column(s) without a primary key"
-    unless @primary_cols;
+=cut
 
-  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";
-    }
-  }
+sub using_freetds {
+  my $self = shift;
 
-  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;
-      }
-    }
-  }
+  return $self->_get_dbh->{syb_oc_version} =~ /freetds/i;
 }
 
-=head2 connect_call_datetime_setup
-
-Used as:
-
-  on_connect_call => 'datetime_setup'
-
-In L<DBIx::Class::Storage::DBI/connect_info> to set:
+=head2 set_textsize
 
-  $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
+When using FreeTDS and/or MSSQL, C<< $dbh->{LongReadLen} >> is not available,
+use this function instead. It does:
 
-On connection for use with L<DBIx::Class::InflateColumn::DateTime>, using
-L<DateTime::Format::Sybase>, which you will need to install.
+  $dbh->do("SET TEXTSIZE $bytes");
 
-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')) {
-# 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 ".
-      "DBIx::Class::InflateColumn::DateTime, please upgrade!";
-      $old_dbd_warned = 1;
-    }
-
-    $dbh->do('SET DATEFORMAT mdy');
-
-    1;
-  }
-}
-
-sub datetime_parser_type { "DateTime::Format::Sybase" }
-
-# ->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->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 {
+sub set_textsize {
   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) = @_;
+  my $text_size =
+    shift
+      ||
+    try { $self->_dbi_connect_info->[-1]->{LongReadLen} }
+      ||
+    32768; # the DBD::Sybase default
 
-  $self->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) = @_;
+  return unless defined $text_size;
 
-  $self->dbh->do("ROLLBACK TRANSACTION $name");
+  $self->_dbh->do("SET TEXTSIZE $text_size");
 }
 
 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/mssql_tweaks
-
-=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
-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
-
-See L</connect_call_datetime_setup> to setup date formats
-for L<DBIx::Class::InflateColumn::DateTime>.
-
-=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.
-
 =head1 AUTHORS
 
 See L<DBIx::Class/CONTRIBUTORS>.
@@ -643,4 +134,3 @@ See L<DBIx::Class/CONTRIBUTORS>.
 You may distribute this code under the same terms as Perl itself.
 
 =cut
-# vim:sts=2 sw=2: