NAME

  Data::Stag::HashDB - build indexes over Stag files or objects

SYNOPSIS

  # parsing a file into a hash
  my $hdb = Data::Stag::HashDB->new;
  $hdb->unique_key("ss_details/social_security_no");
  $hdb->record_type("person");
  my $obj = {};
  $hdb->index_hash($obj);
  Data::Stag->parse(-file=>$fn, -handler=>$hdb);
  my $person = $obj->{'999-9999-9999'};
  print $person->xml;
  # indexing an existing stag tree into a hash
  my $personset = Data::Stag->parse($fn);
  my $hdb = Data::Stag::HashDB->new;
  $hdb->unique_key("ss_details/social_security_no");
  $hdb->record_type("person");
  my $obj = {};
  $hdb->index_hash($obj);
  $personset->sax($hdb);
  my $person = $obj->{'999-9999-9999'};
  print $person->xml;

DESCRIPTION

Used for building indexes over Stag files or objects

You need to provide a record_type - this is the type of element that will be indexed

You need to provide a unique_key - this is a single value used to index the record_types

For example, if we have data in the stag structure below, and if ss_no is unique (we assume it is) then we can index all the people in the database using the code above

  publicinfo:
    persondata:
      person:
        ss_details:
          social_security_no:
        name:
        address:

There is a subclass of this method callsed Data::Stag::StagDB, which makes the hash persistent

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