RDF::Redland::Storage - Redland RDF Storage Class
use RDF::Redland;
my $storage=new RDF::Redland::Storage("hashes", "test", "new='yes',hash-type='memory'");
...
Create objects for storing RDF::Redland::Model objects either persistently
or in memory.
- 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.
the RDF::Redland::Model manpage
Dave Beckett - http://www.dajobe.org/
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