RDF::Redland::Statement(3pm) User Contributed Perl Documentation RDF::Redland::Statement(3pm)NAME
RDF::Redland::Statement - Redland RDF Statement Class
SYNOPSIS
use RDF::Redland;
my $statement1=new RDF::Redland::Statement($statement);
my $statement2=new RDF::Redland::Statement($subject,$predicate,$object);
...
if($statement->subject->equals($node)) {
...
}
DESCRIPTION
Manipulate RDF statements which comprise three RDF::Redland::Node objects. Also used for partial statements which can have empty parts and
are used for matching statements in statement queries of the model - see the RDF::Redland::Model.
CONSTRUCTORS
new NODE NODE NODE|STATEMENT
Create a new statement from nodes or copy an existing statement.
If three NODEs are given, make a new statement from them. Each Node can be a Redland::RDF:Node, a Redland::RDF::URI, a perl URI or a
string literal. Otherwise STATEMENT must be an existing statement to copy.
clone
Copy a RDF::Redland::Statement.
METHODS
subject [SUBJECT]
Get/set the statement subject. When a RDF::Redland::Node SUBJECT is given, sets the subject of the statement, otherwise returns a
reference to the statement RDF::Redland::Node subject.
predicate [PREDICATE]
Get/set the statement predicate. When RDF::Redland::Node PREDICATE is given, sets the predicate of the statement, otherwise returns a
reference to the statement RDF::Redland::Node predicate.
object [OBJECT]
Get/set the statement object. When RDF::Redland::Node OBJECT is given, sets the object of the statement, otherwise returns a reference
to the statement RDF::Redland::Node object.
as_string
Return the statement formatted as a string (UTF-8 encoded).
equals STATEMENT
Return non zero if this statement is equal to STATEMENT
OLD METHODS
new_from_nodes SUBJECT PREDICATE OBJECT
Create a new RDF::Redland::Statement with the given RDF::Redland::Node objects as parts (or undef when empty for a partial statement).
Use instead:
$a=new RDF::Redland::Statement($subject, $predicate, $object);
new_from_statement STATEMENT
Create a new RDF::Redland::Statement object from RDF::Redland::Statement STATEMENT (copy constructor). Use instead:
$s=$old_statement->clone;
SEE ALSO
RDF::Redland::Node
AUTHOR
Dave Beckett - http://www.dajobe.org/
perl v5.14.2 2011-02-04 RDF::Redland::Statement(3pm)
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RDF::Redland::Storage(3pm) User Contributed Perl Documentation RDF::Redland::Storage(3pm)NAME
RDF::Redland::Storage - Redland RDF Storage Class
SYNOPSIS
use RDF::Redland;
my $storage=new RDF::Redland::Storage("hashes", "test", "new='yes',hash-type='memory'");
...
DESCRIPTION
Create objects for storing RDF::Redland::Model objects either persistently or in memory.
CONSTRUCTORS
new STORAGE_NAME [NAME [OPTIONS_STRING]]
Create a new RDF::Redland::Storage object for the storage factory named STORAGE_NAME with storage named NAME and storage options
OPTIONS_STRING which are specific to the storage factory type.
The storage options may be given either as a Perl hash or as a string. The string form are formatted in the form
key1='value1',key2='value2' and the single quotes are required. The Perl hash form follows normal Perl conventions, and the boolean
options use normal Perl concepts of truth.
Currently defined storage options:
new='yes'
Create a new storage erasing any existing one (boolean, default).
write='yes'
Provide write access to store (boolean, default) otherwise is read only.
dir='DIR'
Work in DIR directory when creating files.
mode='MODE'
File creation mode, default is (octal) 0644 Takes decimal(123), hex(0x123) or octal(0123).
contexts='yes'
Enable statement contexts. Each statement can be stored with an optional context Node and the context retrieved after queries.
Boolean.
hash-type='TYPE' (hashes storage only)
Use the TYPE hash-type for hashes storage. Current defined types are 'memory' and 'bdb' but is dependent on the hash factories
available.
index-predicates='yes' (hashes storage only)
Enable indexing from predicates to (subject,object) which can in particular be useful for rdf:type relations. Boolean.
bulk='no' (mysql storage only)
Whether model/storage method add_statements should be optimized, until a model/storage sync operation. Boolean.
merge='no' (mysql storage only)
Whether to maintain a table with merged models. Boolean.
Example, string form:
$storage=new RDF::Redland::Storage("hashes", "test",
"new='yes',hash-type='bdb',dir='.'");
Example, Perl hash form:
$storage=new RDF::Redland::Storage("hashes", "test",
{new=>1,hash-type=>'bdb',dir=>'.'});
Creates a new storage of the hashes type (indexed hashes) named test (these will be file names or URIs if the storage is persistent)
and with options new='yes',hash-type='bdb',dir='.' so a new storage is created with BerkeleyDB (BDB) key:value hashes i.e. persistent
and in the current directory.
Example, Perl hash form:
$storage=new RDF::Redland::Storage("mysql", "test", {host=>'localhost',database=>'testdb',user=>'testuser',new=>0,password=>'',contexts=>1});
Uses an existing storage of the mysql type, named test on localhost with database name testdb using a user testuser and no password.
Contexts are enabled.
new_from_storage STORAGE
Create a new RDF::Redland::Storage object from RDF::Redland::Storage STORAGE (copy constructor). The new storage may have a new name
chosen by the storage factory.
SEE ALSO
RDF::Redland::Model
AUTHOR
Dave Beckett - http://www.dajobe.org/
perl v5.14.2 2011-02-04 RDF::Redland::Storage(3pm)