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        return 1;
    }
}

sub get_key_from_all_sessions {
    my ( $class, $args, $data ) = @_;

    my $table_name = $args->{TableName}
      || $Apache::Session::Store::DBI::TableName;
    my $dbh = $class->_classDbh($args);
    my $sth;

    # Special case if all wanted fields are indexed
    if ( $data and ref($data) ne 'CODE' ) {
        $data = [$data] unless ( ref($data) );
        my $fields = join ',',
          map { s/'//g; qq{a_session->>"\$.$_" AS $_} } @$data;
        $sth = $dbh->prepare("SELECT $fields from $table_name");
        $sth->execute;
        return $sth->fetchall_hashref('id');
    }
    $sth = $dbh->prepare_cached("SELECT id,a_session from $table_name");
    $sth->execute;
    my %res;
    while ( my @row = $sth->fetchrow_array ) {
        no strict 'refs';
        my $self = eval "&${class}::populate();";
        eval {
            my $sub = $self->{unserialize};
            my $tmp = &$sub( { serialized => $row[1] } );
            if ( ref($data) eq 'CODE' ) {
                $tmp = &$data( $tmp, $row[0] );
                $res{ $row[0] } = $tmp if ( defined($tmp) );
            }
            elsif ($data) {
                $data = [$data] unless ( ref($data) );
                $res{ $row[0] }->{$_} = $tmp->{$_} foreach (@$data);
            }
            else {
                $res{ $row[0] } = $tmp;
            }
        };
        if ($@) {
            print STDERR "Error in session $row[0]: $@\n";
            delete $res{ $row[0] };
        }
    }
    return \%res;
}

sub _classDbh {
    my ( $class, $args ) = @_;

    my $datasource = $args->{DataSource} or die "No datasource given !";
    my $username   = $args->{UserName};
    my $password   = $args->{Password};
    my $dbh =
      DBI->connect_cached( $datasource, $username, $password,
        { RaiseError => 1, AutoCommit => 1 } )
      || die $DBI::errstr;
    $dbh->{mysql_enable_utf8} = 1;
    return $dbh;
}

1;
__END__

=head1 NAME

Apache::Session::Browseable::MySQL - Add index and search methods to
Apache::Session::MySQL

=head1 SYNOPSIS

Create table with columns for indexed fields. Example for Lemonldap::NG with
optional virtual tables and indexes:

  CREATE TABLE sessions (
      id varchar(64) not null primary key,
      a_session json,
      as_wt varchar(32) AS (a_session->"$._whatToTrace") VIRTUAL,
      as_sk varchar(12) AS (a_session->"$._session_kind") VIRTUAL,
      as_ut bigint AS (a_session->"$._utime") VIRTUAL,
      as_ip varchar(40) AS (a_session->"$.ipAddr") VIRTUAL,
      KEY as_wt (as_wt),
      KEY as_sk (as_sk),
      KEY as_ut (as_ut),
      KEY as_ip (as_ip)
  ) ENGINE=InnoDB;

Use it with Perl:

  use Apache::Session::Browseable::MySQLJSON;

  my $args = {
       DataSource => 'dbi:mysql:sessions',
       UserName   => $db_user,
       Password   => $db_pass,
       LockDataSource => 'dbi:mysql:sessions',
       LockUserName   => $db_user,
       LockPassword   => $db_pass,

       # Choose your browseable fileds
       Index          => 'uid mail',
  };

Use it like L<Apache::Session::Browseable::MySQL>

=head1 DESCRIPTION

Apache::Session::browseable provides some class methods to manipulate all
sessions and add the capability to index some fields to make research faster.

Apache::Session::Browseable::MySQLJSON implements it for MySQL databases
using "json" type to be able to browse sessions.

THIS MODULE ISN'T USABLE WITH MARIADB FOR NOW.

=head1 SEE ALSO

L<Apache::Session>, L<Apache::Session::Browseable::MySQL>,