1 package DBIx::Class::Storage::Statistics;
5 use base qw/Class::Accessor::Grouped/;
8 __PACKAGE__->mk_group_accessors(simple => qw/callback debugfh silence/);
12 DBIx::Class::Storage::Statistics - SQL Statistics
18 This class is called by DBIx::Class::Storage::DBI as a means of collecting
19 statistics on it's actions. Using this class alone merely prints the SQL
20 executed, the fact that it completes and begin/end notification for
23 To really use this class you should subclass it and create your own method
24 for collecting the statistics as discussed in L<DBIx::Class::Manual::Cookbook>.
32 Returns a new L<DBIx::Class::Storage::Statistics> object.
37 bless $self, (ref($_[0]) || $_[0]);
44 Sets or retrieves the filehandle used for trace/debug output. This should
45 be an IO::Handle compatible object (only the C<print> method is used). Initially
46 should be set to STDERR - although see information on the
47 L<DBIC_TRACE> environment variable.
51 Prints the specified string to our debugging filehandle, which we will attempt
52 to open if we haven't yet. Provided to save our methods the worry of how
53 to display the message.
57 my ($self, $msg) = @_;
59 return if $self->silence;
61 if(!defined($self->debugfh())) {
63 my $debug_env = $ENV{DBIX_CLASS_STORAGE_DBI_DEBUG}
65 if (defined($debug_env) && ($debug_env =~ /=(.+)$/)) {
66 $fh = IO::File->new($1, 'w')
67 or die("Cannot open trace file $1");
69 $fh = IO::File->new('>&STDERR')
70 or die('Duplication of STDERR for debug output failed (perhaps your STDERR is closed?)');
77 $self->debugfh->print($msg);
82 Called when a transaction begins.
88 $self->print("BEGIN WORK\n");
93 Called when a transaction is rolled back.
99 $self->print("ROLLBACK\n");
104 Called when a transaction is committed.
110 $self->print("COMMIT\n");
115 Called when a savepoint is created.
119 my ($self, $name) = @_;
121 $self->print("SAVEPOINT $name\n");
126 Called when a savepoint is released.
130 my ($self, $name) = @_;
132 $self->print("RELEASE SAVEPOINT $name\n");
137 Called when rolling back to a savepoint.
141 my ($self, $name) = @_;
143 $self->print("ROLLBACK TO SAVEPOINT $name\n");
148 Called before a query is executed. The first argument is the SQL string being
149 executed and subsequent arguments are the parameters used for the query.
153 my ($self, $string, @bind) = @_;
155 my $message = "$string: ".join(', ', @bind)."\n";
157 if(defined($self->callback)) {
158 $string =~ m/^(\w+)/;
159 $self->callback->($1, $message);
163 $self->print($message);
168 Called when a query finishes executing. Has the same arguments as query_start.
172 my ($self, $string) = @_;
179 Cory G. Watson <gphat@cpan.org>
183 You may distribute this code under the same license as Perl itself.