https://sourceforge.net/p/odcleanstore/wiki/Sesame/Recent changes to SesameenFri, 04 May 2012 15:51:22 -0000https://sourceforge.net/p/odcleanstore/wiki/Sesame/<pre>--- v1 +++ v2 @@ -11,3 +11,15 @@ Pri pouziti equals() na Statement se neporovnava (verze 2.6.5) jmenny graf. +Querying +-------- +The Repository API has a number of methods for creating and evaluating queries. Three types of queries are distinguished: tuple queries, graph queries and boolean queries. The query types differ in the type of results that they produce. + +The result of a tuple query is a set of tuples (or variable bindings), where each tuple represents a solution of a query. This type of query is commonly used to get specific values (URIs, blank nodes, literals) from the stored RDF data. + +The result of graph queries is an RDF graph (or set of statements). This type of query is very useful for extracting sub-graphs from the stored RDF data, which can then be queried further, serialized to an RDF document, etc. + +The result of boolean queries is a simple boolean value, i.e. true or false. This type of query can be used to check if a repository contains specific information. + +* results of the queries can be processed in a pull-manner (by iterating over the results) or push-manner (by defining a callback method) +* lazy retrieving </pre>Tomas KnapFri, 04 May 2012 15:51:22 -0000https://sourceforge.net7c4d3f4512c2ec7d8d8c91dcce730ed0cf419503https://sourceforge.net/p/odcleanstore/wiki/Sesame/Sesame ====== Lightweight alternativa k Jeně, pouziva jej LDM. Všechno, co je potřeba vědět je tady: * [uživatelská dokumentace](http://www.openrdf.org/doc/sesame2/users/ch08.html) * [javadoc](http://www.openrdf.org/doc/sesame2/api/) * [Virtuoso provider](http://virtuoso.openlinksw.com/dataspace/dav/wiki/Main/VirtSesame2Provider) Sesame pouziva jinou terminologii nez Jena (Quad -&gt; Statement, NamedGraph -&gt; context). Zatim to vypada, ze dotazovani by bylo v Sesame i rycheljsi, ale neumoznuje null ve vysledcich dotazu (afaik lze obejit pouze vypnutim assertions v Jave). Pri pouziti equals() na Statement se neporovnava (verze 2.6.5) jmenny graf. Jan MichelfeitSun, 29 Apr 2012 12:41:39 -0000https://sourceforge.netcd531941a5f467597daed4ea9c469bc58a3f6a81