我使用jena和fuseki作为sparql服务器,并使用python对sparql端点执行HTTP请求以插入/更新。我需要关于如何使流程“事务化”的建议(我搜索了一下,但没有完全掌握这个概念)。你知道吗
fuseki服务的配置如下所示,它指定目录tdb/下的数据集。这项服务运行了一段时间。然后有一天,我在python项目中发现了显示查询fuseki端点失败的日志。同时Fuseki服务报告
org.apache.jena.dboe.DBOpEnvException: No known block type for 0
各种各样的要求。我的网络搜索结果表明,原因可能是“一个可能的原因是,你在过去使用非事务性的,没有刷新磁盘更改一次,或应用程序崩溃”。你知道吗
相关网页包括:
http://mail-archives.apache.org/mod_mbox/jena-users/201504.mbox/<;5541034B。3000304@gmail.com>;你知道吗
http://mail-archives.apache.org/mod_mbox/jena-users/201603.mbox/%3C56F4412C.8010002@apache.org%3E
# Service Configuration
@prefix : <http://base/#> .
@prefix tdb: <http://jena.hpl.hp.com/2008/tdb#> .
@prefix tdb2: <http://jena.apache.org/2016/tdb#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix ja: <http://jena.hpl.hp.com/2005/11/Assembler#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix fuseki: <http://jena.apache.org/fuseki#> .
<#serviceKgService> a fuseki:Service ;
fuseki:name "my_project" ;
fuseki:dataset <#dataset> ;
fuseki:serviceQuery "query" , "sparql" ;
fuseki:serviceReadGraphStore "get" ;
fuseki:serviceReadWriteGraphStore "data" ;
fuseki:serviceUpdate "update" ;
fuseki:serviceUpload "upload" .
<#dataset> rdf:type ja:RDFDataset ;
ja:defaultGraph <#model_inf> .
<#model_inf> a ja:InfModel ;
ja:baseModel <#tdbGraph> ;
ja:reasoner [
ja:reasonerURL <http://jena.hpl.hp.com/2003/GenericRuleReasoner> ;
ja:rulesFrom <file:my_rules.ttl> ;
].
<#tdbGraph> rdf:type tdb2:GraphTDB ;
tdb2:dataset <#tdbDataset> .
<#tdbDataset> rdf:type tdb2:DatasetTDB ;
tdb2:location "tdb" .
[] rdf:type fuseki:Server ;
# Rules
@prefix : <http://kg.example.com/kg_root#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
[transitiveRule: (?p :subLevelOf ?m), (?m :subLevelOf ?q) -> (?p :subLevelOf ?q)]
# Last Queries: I did some replacement, but the key points
# are 1. the first object value is a length-2 chineses string
# 2. the seconds object value is a length-50 english string
select distinct ?x where {
?x <http://kg.example.com/prop/direct/example_prop1> '示例'.
?x <http://kg.example.com/prop/direct/example_prop2> 'xxxxxxxx.xxx.xxxxxx.xxxxxxxxxxxxx_xxxxxxxx_xxxx_xx'.
}
# Error
[2019-01-20 15:51:17] Fuseki WARN [5] RC = 500 : No known block type for 0
org.apache.jena.dboe.DBOpEnvException: No known block type for 0
at
org.apache.jena.dboe.base.block.BlockType.extract(BlockType.java:66)
目前没有回答
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