Dominic Hargreaves > Wiki-Toolkit-0.82 > Wiki::Toolkit::Store::Database

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Module Version: 0.31   Source   Latest Release: Wiki-Toolkit-0.84

NAME ^

Wiki::Toolkit::Store::Database - parent class for database storage backends for Wiki::Toolkit

SYNOPSIS ^

This is probably only useful for Wiki::Toolkit developers.

  # See below for parameter details.
  my $store = Wiki::Toolkit::Store::MySQL->new( %config );

METHODS ^

new
  my $store = Wiki::Toolkit::Store::MySQL->new( dbname  => "wiki",
                        dbuser  => "wiki",
                        dbpass  => "wiki",
                        dbhost  => "db.example.com",
                        dbport  => 1234,
                        charset => "iso-8859-1" );
or

  my $store = Wiki::Toolkit::Store::MySQL->new( dbh => $dbh );

charset is optional, defaults to iso-8859-1, and does nothing unless you're using perl 5.8 or newer.

If you do not provide an active database handle in dbh, then dbname is mandatory. dbpass, dbuser, dbhost and dbport are optional, but you'll want to supply them unless your database's connection method doesn't require them.

If you do provide database then it must have the following parameters set; otherwise you should just provide the connection information and let us create our own handle:

  • RaiseError = 1
  • PrintError = 0
  • AutoCommit = 1
retrieve_node
  my $content = $store->retrieve_node($node);

  # Or get additional meta-data too.
  my %node = $store->retrieve_node("HomePage");
  print "Current Version: " . $node{version};

  # Maybe we stored some metadata too.
  my $categories = $node{metadata}{category};
  print "Categories: " . join(", ", @$categories);
  print "Postcode: $node{metadata}{postcode}[0]";

  # Or get an earlier version:
  my %node = $store->retrieve_node(name    => "HomePage",
                         version => 2 );
  print $node{content};

In scalar context, returns the current (raw Wiki language) contents of the specified node. In list context, returns a hash containing the contents of the node plus additional data:

last_modified
version
checksum
metadata - a reference to a hash containing any caller-supplied metadata sent along the last time the node was written

The node parameter is mandatory. The version parameter is optional and defaults to the newest version. If the node hasn't been created yet, it is considered to exist but be empty (this behaviour might change).

Note on metadata - each hash value is returned as an array ref, even if that type of metadata only has one value.

node_exists
  my $ok = $store->node_exists( "Wombat Defenestration" );

  # or ignore case - optional but recommended
  my $ok = $store->node_exists(
                                name        => "monkey brains",
                                ignore_case => 1,
                              );  

Returns true if the node has ever been created (even if it is currently empty), and false otherwise.

By default, the case-sensitivity of node_exists depends on your database. If you supply a true value to the ignore_case parameter, then you can be sure of its being case-insensitive. This is recommended.

verify_checksum
  my $ok = $store->verify_checksum($node, $checksum);

Sees whether your checksum is current for the given node. Returns true if so, false if not.

NOTE: Be aware that when called directly and without locking, this might not be accurate, since there is a small window between the checking and the returning where the node might be changed, so don't rely on it for safe commits; use write_node for that. It can however be useful when previewing edits, for example.

list_backlinks
  # List all nodes that link to the Home Page.
  my @links = $store->list_backlinks( node => "Home Page" );
list_dangling_links
  # List all nodes that have been linked to from other nodes but don't
  # yet exist.
  my @links = $store->list_dangling_links;

Each node is returned once only, regardless of how many other nodes link to it.

write_node_post_locking
  $store->write_node_post_locking( node     => $node,
                                   content  => $content,
                                   links_to => \@links_to,
                                   metadata => \%metadata,
                                   requires_moderation => $requires_moderation,
                                   plugins  => \@plugins   )
      or handle_error();

Writes the specified content into the specified node, then calls post_write on all supplied plugins, with arguments node, version, content, metadata.

Making sure that locking/unlocking/transactions happen is left up to you (or your chosen subclass). This method shouldn't really be used directly as it might overwrite someone else's changes. Croaks on error but otherwise returns the version number of the update just made. A return value of -1 indicates that the change was not applied. This may be because the plugins voted against the change, or because the content and metadata in the proposed new version were identical to the current version (a "null" change).

Supplying a ref to an array of nodes that this ones links to is optional, but if you do supply it then this node will be returned when calling list_backlinks on the nodes in @links_to. Note that if you don't supply the ref then the store will assume that this node doesn't link to any others, and update itself accordingly.

The metadata hashref is also optional, as is requires_moderation.

Note on the metadata hashref: Any data in here that you wish to access directly later must be a key-value pair in which the value is either a scalar or a reference to an array of scalars. For example:

  $wiki->write_node( "Calthorpe Arms", "nice pub", $checksum,
                     { category => [ "Pubs", "Bloomsbury" ],
                       postcode => "WC1X 8JR" } );

  # and later

  my @nodes = $wiki->list_nodes_by_metadata(
      metadata_type  => "category",
      metadata_value => "Pubs"             );

For more advanced usage (passing data through to registered plugins) you may if you wish pass key-value pairs in which the value is a hashref or an array of hashrefs. The data in the hashrefs will not be stored as metadata; it will be checksummed and the checksum will be stored instead (as __metadatatypename__checksum). Such data can only be accessed via plugins.

rename_node
  $store->rename_node(
                         old_name  => $node,
                         new_name  => $new_node,
                         wiki      => $wiki,
                         create_new_versions => $create_new_versions,
                       );

Renames a node, updating any references to it as required (assuming your chosen formatter supports rename, that is).

Uses the internal_links table to identify the nodes that link to this one, and re-writes any wiki links in these to point to the new name.

moderate_node
  $store->moderate_node(
                         name    => $node,
                         version => $version
                       );

Marks the given version of the node as moderated. If this is the highest moderated version, then update the node's contents to hold this version.

set_node_moderation
  $store->set_node_moderation(
                         name     => $node,
                         required => $required
                       );

Sets if new node versions will require moderation or not

delete_node
  $store->delete_node(
                       name    => $node,
                       version => $version,
                       wiki    => $wiki
                     );

version is optional. If it is supplied then only that version of the node will be deleted. Otherwise the node and all its history will be completely deleted.

wiki is also optional, but if you care about updating the backlinks you want to include it.

Again, doesn't do any locking. You probably don't want to let anyone except Wiki admins call this. You may not want to use it at all.

Croaks on error, silently does nothing if the node or version doesn't exist, returns true if no error.

list_recent_changes
  # Nodes changed in last 7 days - each node listed only once.
  my @nodes = $store->list_recent_changes( days => 7 );

  # Nodes added in the last 7 days.
  my @nodes = $store->list_recent_changes(
                                           days     => 7,
                                           new_only => 1,
                                         );

  # All changes in last 7 days - nodes changed more than once will
  # be listed more than once.
  my @nodes = $store->list_recent_changes(
                                           days => 7,
                                           include_all_changes => 1,
                                         );

  # Nodes changed between 1 and 7 days ago.
  my @nodes = $store->list_recent_changes( between_days => [ 1, 7 ] );

  # Nodes changed since a given time.
  my @nodes = $store->list_recent_changes( since => 1036235131 );

  # Most recent change and its details.
  my @nodes = $store->list_recent_changes( last_n_changes => 1 );
  print "Node:          $nodes[0]{name}";
  print "Last modified: $nodes[0]{last_modified}";
  print "Comment:       $nodes[0]{metadata}{comment}";

  # Last 5 restaurant nodes edited.
  my @nodes = $store->list_recent_changes(
      last_n_changes => 5,
      metadata_is    => { category => "Restaurants" }
  );

  # Last 5 nodes edited by Kake.
  my @nodes = $store->list_recent_changes(
      last_n_changes => 5,
      metadata_was   => { username => "Kake" }
  );

  # All minor edits made by Earle in the last week.
  my @nodes = $store->list_recent_changes(
      days           => 7,
      metadata_was   => { username  => "Earle",
                          edit_type => "Minor tidying." }
  );

  # Last 10 changes that weren't minor edits.
  my @nodes = $store->list_recent_changes(
      last_n_changes => 10,
      metadata_wasnt  => { edit_type => "Minor tidying" }
  );

You must supply one of the following constraints: days (integer), since (epoch), last_n_changes (integer).

You may also supply moderation => 1 if you only want to see versions that are moderated.

Another optional parameter is new_only, which if set to 1 will only return newly added nodes.

You may also supply either metadata_is (and optionally metadata_isnt), or metadata_was (and optionally metadata_wasnt). Each of these should be a ref to a hash with scalar keys and values. If the hash has more than one entry, then only changes satisfying all criteria will be returned when using metadata_is or metadata_was, but all changes which fail to satisfy any one of the criteria will be returned when using metadata_isnt or metadata_is.

metadata_is and metadata_isnt look only at the metadata that the node currently has. metadata_was and metadata_wasnt take into account the metadata of previous versions of a node. Don't mix is with was - there's no check for this, but the results are undefined.

Returns results as an array, in reverse chronological order. Each element of the array is a reference to a hash with the following entries:

  • name: the name of the node
  • version: the version number of the node
  • last_modified: timestamp showing when this version was written
  • metadata: a ref to a hash containing any metadata attached to this version of the node

Unless you supply include_all_changes, metadata_was or metadata_wasnt, each node will only be returned once regardless of how many times it has been changed recently.

By default, the case-sensitivity of both metadata_type and metadata_value depends on your database - if it will return rows with an attribute value of "Pubs" when you asked for "pubs", or not. If you supply a true value to the ignore_case parameter, then you can be sure of its being case-insensitive. This is recommended.

list_all_nodes
  my @nodes = $store->list_all_nodes();
  print "First node is $nodes[0]\n";

  my @nodes = $store->list_all_nodes( with_details=> 1 );
  print "First node is ".$nodes[0]->{'name'}." at version ".$nodes[0]->{'version'}."\n";

Returns a list containing the name of every existing node. The list won't be in any kind of order; do any sorting in your calling script.

Optionally also returns the id, version and moderation flag.

list_node_all_versions
  my @all_versions = $store->list_node_all_versions(
      name => 'HomePage',
      with_content => 1,
      with_metadata => 0
  );

Returns all the versions of a node, optionally including the content and metadata, as an array of hashes (newest versions first).

list_nodes_by_metadata
  # All documentation nodes.
  my @nodes = $store->list_nodes_by_metadata(
      metadata_type  => "category",
      metadata_value => "documentation",
      ignore_case    => 1,   # optional but recommended (see below)
  );

  # All pubs in Hammersmith.
  my @pubs = $store->list_nodes_by_metadata(
      metadata_type  => "category",
      metadata_value => "Pub",
  );
  my @hsm  = $store->list_nodes_by_metadata(
      metadata_type  => "category",
      metadata_value  => "Hammersmith",
  );
  my @results = my_l33t_method_for_ANDing_arrays( \@pubs, \@hsm );

Returns a list containing the name of every node whose caller-supplied metadata matches the criteria given in the parameters.

By default, the case-sensitivity of both metadata_type and metadata_value depends on your database - if it will return rows with an attribute value of "Pubs" when you asked for "pubs", or not. If you supply a true value to the ignore_case parameter, then you can be sure of its being case-insensitive. This is recommended.

If you don't supply any criteria then you'll get an empty list.

This is a really really really simple way of finding things; if you want to be more complicated then you'll need to call the method multiple times and combine the results yourself, or write a plugin.

list_nodes_by_missing_metadata Returns nodes where either the metadata doesn't exist, or is blank

Unlike list_nodes_by_metadata(), the metadata value is optional.

  # All nodes missing documentation
  my @nodes = $store->list_nodes_by_missing_metadata(
      metadata_type  => "category",
      metadata_value => "documentation",
      ignore_case    => 1,   # optional but recommended (see below)
  );

  # All nodes which don't have a latitude defined
  my @nodes = $store->list_nodes_by_missing_metadata(
      metadata_type  => "latitude"
  );
_get_list_by_metadata_sql

Return the SQL to do a match by metadata. Should expect the metadata type as the first SQL parameter, and the metadata value as the second.

If possible, should take account of $args{ignore_case}

_get_list_by_missing_metadata_sql

Return the SQL to do a match by missing metadata. Should expect the metadata type as the first SQL parameter.

If possible, should take account of $args{ignore_case}

list_unmoderated_nodes
  my @nodes = $wiki->list_unmoderated_nodes();
  my @nodes = $wiki->list_unmoderated_nodes(
                                                only_where_latest => 1
                                            );

  $nodes[0]->{'name'}              # The name of the node
  $nodes[0]->{'node_id'}           # The id of the node
  $nodes[0]->{'version'}           # The version in need of moderation
  $nodes[0]->{'moderated_version'} # The newest moderated version

  With only_where_latest set, return the id, name and version of all the
   nodes where the most recent version needs moderation.
  Otherwise, returns the id, name and version of all node versions that need
   to be moderated.
list_last_version_before
    List the last version of every node before a given date.
    If no version existed before that date, will return undef for version.
    Returns a hash of id, name, version and date

    my @nv = $wiki->list_last_version_before('2007-01-02 10:34:11')
    foreach my $data (@nv) {
        
    }
list_metadata_by_type
    List all the currently defined values of the given type of metadata.

    Will only return data from the latest moderated version of each node

    # List all of the different metadata values with the type 'category'
    my @categories = $wiki->list_metadata_by_type('category');
list_metadata_names
    List all the currently defined kinds of metadata, eg Locale, Postcode

    Will only return data from the latest moderated version of each node

    # List all of the different kinds of metadata
    my @metadata_types = $wiki->list_metadata_names()
schema_current
  my ($code_version, $db_version) = $store->schema_current;
  if ($code_version == $db_version)
      # Do stuff
  } else {
      # Bail
  }
dbh
  my $dbh = $store->dbh;

Returns the database handle belonging to this storage backend instance.

dbname
  my $dbname = $store->dbname;

Returns the name of the database used for backend storage.

dbuser
  my $dbuser = $store->dbuser;

Returns the username used to connect to the database used for backend storage.

dbpass
  my $dbpass = $store->dbpass;

Returns the password used to connect to the database used for backend storage.

dbhost
  my $dbhost = $store->dbhost;

Returns the optional host used to connect to the database used for backend storage.

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