docs: add TIPS
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@ -38,10 +38,10 @@
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<option value="q4">q4</option>
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<option value="q5">q5</option>
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<option value="q6">q6</option>
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<option value="q7">q7</option>
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<option value="q8">q8</option>
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<option value="q9">q9</option>
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<option value="q10">q10</option>
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<!--<option value="q7">q7</option>-->
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<!--<option value="q8">q8</option>-->
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<!--<option value="q9">q9</option>-->
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<!--<option value="q10">q10</option>-->
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</select>
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</div>
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</li>
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@ -139,6 +139,47 @@ function handleQueryExample()
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{
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var example = document.getElementById("example").value;
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if (example === "q1")
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{
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document.getElementById("element_3").value = "SELECT ?v0 ?v1 ?v2 WHERE \n" +
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"{ \n" +
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"\t?v0 <http://dbpedia.org/property/dateOfBirth> ?v2 .\n" +
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"\t?v1 <http://dbpedia.org/property/genre> ?v2 .\n" +
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"} \n";
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}
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if (example === "q2")
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{
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document.getElementById("element_3").value = "SELECT ?v0 WHERE \n" +
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"{ \n" +
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"\t?v0 <http://dbpedia.org/ontology/associatedBand> <http://dbpedia.org/resource/LCD_Soundsystem> .\n" +
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"} \n";
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}
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if (example === "q3")
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{
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document.getElementById("element_3").value = "SELECT ?v2 WHERE \n" +
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"{ \n" +
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"\t<http://dbpedia.org/resource/!!Destroy-Oh-Boy!!> <http://dbpedia.org/property/title> ?v2 .\n" +
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"} \n";
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}
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if (example === "q4")
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{
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document.getElementById("element_3").value = "SELECT ?v0 ?v2 WHERE \n" +
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"{ \n" +
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"\t ?v0 <http://dbpedia.org/ontology/activeYearsStartYear> ?v2 .\n" +
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"} \n";
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}
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if (example === "q5")
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{
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document.getElementById("element_3").value = "SELECT ?v0 ?V1 ?V2 ?v3 WHERE \n" +
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"{ \n" +
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"\t?v0 <http://dbpedia.org/property/familycolor> ?v1 .\n" +
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"\t?v0 <http://dbpedia.org/property/glotto> ?v2 .\n" +
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"\t?v0 <http://dbpedia.org/property/lc> ?v3 .\n" +
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"} \n";
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}
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if (example === "q6")
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{
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document.getElementById("element_3").value = "SELECT DISTINCT ?v0 ?v1 ?v2 \n" +
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"WHERE \n" +
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@ -148,89 +189,44 @@ function handleQueryExample()
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"\t?v0 <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Language> . \n" +
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"} \n";
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}
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if (example === "q2")
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{
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document.getElementById("element_3").value = "SELECT ?v0 ?v1 WHERE \n" +
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"{ \n" +
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"\t?v0 <http://purl.org/dc/terms/subject> ?v1 .\n" +
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"} \n";
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}
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if (example === "q3")
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{
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document.getElementById("element_3").value = "SELECT ?v0 ?v1 ?v2 ?v3 WHERE \n" +
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"{ \n" +
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"\t?v0 <http://dbpedia.org/ontology/wikiPageWikiLink> <http://dbpedia.org/resource/Alcohol> .\n" +
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"\tOPTIONAL{?v0 <http://dbpedia.org/ontology/wikiPageWikiLink> ?v2 .}\n" +
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"} \n";
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}
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if (example === "q4")
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{
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document.getElementById("element_3").value = "SELECT DISTINCT ?v0 WHERE \n" +
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"{ \n" +
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"\t?v0 <http://purl.org/dc/terms/subject> <http://dbpedia.org/resource/Category:956_births> .\n" +
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"\t{?v0 <http://dbpedia.org/property/wikiPageUsesTemplate> ?v1 .}\n" + "UNION\n" +
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"\t{?v0 <http://dbpedia.org/prpperty/hasPhotoCollection> ?v2 .}\n" +
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"} \n";
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}
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if (example === "q5")
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{
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document.getElementById("element_3").value = "SELECT ?v0 ?v2 ?v3 WHERE \n" +
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"{ \n" +
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"\t?v0 <http://dbpedia.org/ontology/wikiPageWikiLink> <http://dbpedia.org/resource/Autism> .\n" +
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"\t?v2 <http://dbpedia.org/property/candidate> ?v0 .\n" +
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"\t?v3 <http://dbpedia.org/property/constituencyWestminster> ?v2 .\n" +
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"} \n";
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}
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if (example === "q6")
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{
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document.getElementById("element_3").value = "SELECT ?V1 ?V2 WHERE \n" +
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"{ \n" +
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"\t?v1 <http://www.w3.org/2002/07/owl#sameAs> <http://it.dbpedia.org/resource/Category:Filosofi_del_IV_secolo_a.C.> .\n" +
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"\t?v2 <dbpedia.org/ontology/wikiPageWikiLink> ?v1 .\n" +
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"\t<http://dbpedia.org/resource/Chinese_classics> <http://dbpedia.org/ontology/wikiPageWikiLink> ?v2 .\n" +
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"} \n";
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}
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if (example === "q7")
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{
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document.getElementById("element_3").value = "SELECT ?v0 ?v1 WHERE \n" +
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"{ \n" +
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"\t<http://dbpedia.org/resource/Albedo> <http://dbpedia.org/ontology/wikiPageWikiLink> ?v0 .\n" +
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"\t?v1 <http://dbpedia.org/ontology/wikiPageWikiLink> ?v0 .\n" +
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"}\n";
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}
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if (example === "q8")
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{
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document.getElementById("element_3").value = "SELECT ?v0 ?v1 ?v2 ?v3 ?v4 ?v5 ?v6 WHERE \n" +
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"{\n" +
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"\t?v0 <http://www.w3.org/2004/02/skos/core#broader> ?v1 .\n" +
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"\t?v0 <http://dbpedia.org/ontology/child> ?v2 .\n" +
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"\t?v0 <http://dbpedia.org/ontology/spouse> ?v3 .\n" +
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"\t?v0 <http://dbpedia.org/ontology/profession> ?v4 .\n" +
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"\t?v0 <http://dbpedia.org/ontology/party> ?v5 .\n" +
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"\t?v0 <http://dbpedia.prg/ontology/militaryRank> ?v6 .\n" +
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"}\n";
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}
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if (example === "q9")
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{
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document.getElementById("element_3").value = "SELECT ?v0 ?v1 ?v2 ?v3 WHERE\n" +
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"{\n" +
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"\t?V0 <http://dbpedia.org/ontology/location> ?v1 .\n" +
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"\t?v0 <http://dbpedia.org/ontology/typeOfElectrification> ?v2 .\n" +
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"\t?v0 <http://dbpedia.org/ontology/wikiPageWikiLink> <http://dbpedia.org/resource/Koltsevaya_Line> .\n" +
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"\t?v0 <http://dbpedia.org/property/wikiPageUsesTemplate> ?v3 .\n" +
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"}\n";
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}
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if (example === "q10")
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{
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document.getElementById("element_3").value = "SELECT ?v0 ?v1 ?v2 ?v3 WHERE\n" +
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"{\n" +
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"\t?v0 <http://dbpedia.org/property/hasPhotoCollection> ?v1 .\n" +
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"\t?v0 <xmlns.com/foaf/0.1/depiction> ?v2 .\n" +
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"\t?v0 <http://dbpedia.org/ontology/abstract> ?v3 .\n" +
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"\t?v0 <http://dbpedia.org/ontology/wikiPageWikiLink> <http://dbpedia.org/resource/Combination> .\n" +
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"}\n";
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}
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//if (example === "q7")
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//{
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//document.getElementById("element_3").value = "SELECT ?v0 ?v1 WHERE \n" +
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//"{ \n" +
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//"\t<http://dbpedia.org/resource/Albedo> <http://dbpedia.org/ontology/wikiPageWikiLink> ?v0 .\n" +
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//"\t?v1 <http://dbpedia.org/ontology/wikiPageWikiLink> ?v0 .\n" +
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//"}\n";
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//}
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//if (example === "q8")
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//{
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//document.getElementById("element_3").value = "SELECT ?v0 ?v1 ?v2 ?v3 ?v4 ?v5 ?v6 WHERE \n" +
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//"{\n" +
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//"\t?v0 <http://www.w3.org/2004/02/skos/core#broader> ?v1 .\n" +
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//"\t?v0 <http://dbpedia.org/ontology/child> ?v2 .\n" +
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//"\t?v0 <http://dbpedia.org/ontology/spouse> ?v3 .\n" +
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//"\t?v0 <http://dbpedia.org/ontology/profession> ?v4 .\n" +
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//"\t?v0 <http://dbpedia.org/ontology/party> ?v5 .\n" +
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//"\t?v0 <http://dbpedia.prg/ontology/militaryRank> ?v6 .\n" +
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//"}\n";
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//}
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//if (example === "q9")
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//{
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//document.getElementById("element_3").value = "SELECT ?v0 ?v1 ?v2 ?v3 WHERE\n" +
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//"{\n" +
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//"\t?V0 <http://dbpedia.org/ontology/location> ?v1 .\n" +
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//"\t?v0 <http://dbpedia.org/ontology/typeOfElectrification> ?v2 .\n" +
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//"\t?v0 <http://dbpedia.org/ontology/wikiPageWikiLink> <http://dbpedia.org/resource/Koltsevaya_Line> .\n" +
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//"\t?v0 <http://dbpedia.org/property/wikiPageUsesTemplate> ?v3 .\n" +
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//"}\n";
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//}
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//if (example === "q10")
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//{
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//document.getElementById("element_3").value = "SELECT ?v0 ?v1 ?v2 ?v3 WHERE\n" +
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//"{\n" +
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//"\t?v0 <http://dbpedia.org/property/hasPhotoCollection> ?v1 .\n" +
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//"\t?v0 <xmlns.com/foaf/0.1/depiction> ?v2 .\n" +
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//"\t?v0 <http://dbpedia.org/ontology/abstract> ?v3 .\n" +
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//"\t?v0 <http://dbpedia.org/ontology/wikiPageWikiLink> <http://dbpedia.org/resource/Combination> .\n" +
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//"}\n";
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//}
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}
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47
docs/TIPS.md
47
docs/TIPS.md
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@ -1,6 +1,47 @@
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**This chapter introduces some useful tricks if you are using gStore to implement applications.**
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*no tips available now*
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---
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#### Config
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If you are using gStore to serve as a SPARQL Endpoint, you had better set the SPARQL_ENDPOINT macro in Util.h.
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In addition, all DEBUG macros in Util.h should not be used.
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What is more, if you do not use gStore as endpoint, but you do not need to update the database, ONLY_READ macro should be set in Util.h.
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---
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#### Backup
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When running as a HTTP server, gStore has provided a backup function, and you can modify the time interval of backup procedure in Util.
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However, this backup utility can not take effect if the whole disk is down.
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As a result, you had better use multiple machines or clouds to do other backup procedures by yourself, if you are requiring a high security.
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---
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#### Query
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When running as a HTTP server, gStore has set a time limit for query processing, i.e. 1 hour.
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You can modify this parameter in Util as you wish, but we suggest that the lowest bound is 1 minute.
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---
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#### KVstore
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The efficiency of KVstore has huge impact on the performance of the whole system, and you can modify related parameters in KVstore.h, according to your demand and memory capacity.
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---
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#### String Buffer
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To speed up the process of reading Strings from disk when running into getFinalResult() function of the query processing, gStore has provided String Buffers for entities and literals.
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You can set this parameters in setStringBuffer() of Database.h according to the memory capacity of your machine.
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---
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#### HTTP API
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If you are using HTTP API, and use Java to visit it, then you must be care for the efficiency(due to the Garbage Collection process in jvm).
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We strongly suggest that you read codes in api/http/java carefully, before you write your own program to use the REST API providing by HTTP protocol.
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---
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java api http efficiency
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TODO: API and USAGE
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