the Neo4j-indexing provider (which is also used by Cypher) is lucene, so the default lucene query syntax works in the neo4j core API and Cypher queries.
http://lucene.apache.org/java/3_4_0/queryparsersyntax.html Michael Am 03.11.2011 um 03:32 schrieb andrew ton: > > > Hi Michael, > > Thank you very much! Your answers are very helpful to me. Although I have > read the manual enclosed in the neo4j package I downloaded I did not know > that we can use * wildcard for any ids or names. > > Besides the manual what other resources can I find to understand more about > Cypher? > > Appreciated your help. > > A. > > > > > > ________________________________ > From: Michael Hunger <[email protected]> > To: Neo4j user discussions <[email protected]> > Sent: Wednesday, November 2, 2011 5:31 PM > Subject: Re: [Neo4j] Cypher questions > > Both your questions would be answered with indexing: > > for the 1) you would add the user nodes them to a "User" index and then use > > start user=node:User("id:*") ... > > For 2) you would index the relationships-similarly (for the interesting > types). > > e.g. create an index for only the rel-type you're interested in: > index().forRelationships("go_to_school").add(rel, "key","value") key and > value are arbitrary things, but you might leverage them with sensible data in > your domain model. > > start r = relationship:go_to_school("field:*") match (x)-[r]->(n) where > n.name = "Notre Dame" return x > > > !! usually you would probably rather index the schools, and look them up > directly > > start school = node:schools("name",{school_name}) match > pupil-[:go_to_school]->school return pupil > > > (You could use auto-indexing for both if that is useful for you, the > index-names would then be node_auto_index and relationship_auto_index, see : > > http://docs.neo4j.org/chunked/snapshot/auto-indexing.htmlhttp://docs.neo4j.org/chunked/snapshot/rest-api-auto-indexes.html > > ) > Am 03.11.2011 um 00:35 schrieb andrew ton: > >> >> >> Hello, >> >> I have some questions regarding Cypher. >> >> 1. I have an ontology that defines classes and individuals. I store this >> ontology into Neo4J REST db. Is there any ways to find all individuals that >> have some given class? >> In SPARQL, it can be done like "...WHERE { ?u a :User.}..." to find all >> instances that have a type of User. >> >> 2. Similar to the question#1, if I understand correctly in Cypher I always >> have to start with a known node either by its ID or name. If so how to find >> any nodes that have some given relationship? >> For example, I want to find any nodes that have the the relationship type >> "go_to_school". >> >> (x)-[:go_to_school]->(n) where (n.name= "NotreDame") return x >> >> Thank you, >> _______________________________________________ >> Neo4j mailing list >> [email protected] >> https://lists.neo4j.org/mailman/listinfo/user > > _______________________________________________ > Neo4j mailing list > [email protected] > https://lists.neo4j.org/mailman/listinfo/user > _______________________________________________ > Neo4j mailing list > [email protected] > https://lists.neo4j.org/mailman/listinfo/user _______________________________________________ Neo4j mailing list [email protected] https://lists.neo4j.org/mailman/listinfo/user
