我对RDFLIB很陌生,我正在学习如何使用Delete/Insert
语句从CSV文件中不断更新我本体中个人的数据属性值。我使用pandas dataframe
来做到这一点,但我现在卡住了。
如果我要直接使用诸如23,34.6,13330等值,我能够成功地做到这一点,但我的挑战是,如果我从CSV读取数据并将其存储为变量说'x',则这不起作用。下面是我的代码中运行良好的部分:
g.update( """ DELETE { ?Product myontology:LifecycleData ?lifecycle } INSERT { ?Product myontology:LifecycleData 243 } WHERE { ?Product myontology:LifecycleData ?lifecycle . } """)
我会将您的字符串查询构建与查询提交分开,并测试查询(视觉上),并确保它是正确的,如下所示:
q = """
DELETE {
?Product myontology:LifecycleData ?lifecycle
}
INSERT {
?Product myontology:LifecycleData xxx
}
WHERE {
?Product myontology:LifecycleData ?lifecycle
}
""".replace("xxx", str(df.tail(1)['Usecycle left'].values[0]))
# I like to use replace() rather than string templating
# so I don't have to escape characters like { in the query
print(q) # does it look like you expect it to at this point?
# then...
g.update(
q,
initNs={
"myontology": Namespace("http://example.com/myontology#")
}
)