Actually, it might be an idea to look at this kind of DSL for Cypher, much along the (Scala) lines of Rickards Java-DSL, http://rickardoberg.wordpress.com/2011/11/14/creating-a-dsl-for-cypher-graph-queries/ instead of trying to mimic literal Cypher Strings.
WDYT? Cheers, /peter neubauer GTalk: neubauer.peter Skype peter.neubauer Phone +46 704 106975 LinkedIn http://www.linkedin.com/in/neubauer Twitter http://twitter.com/peterneubauer http://www.neo4j.org - NOSQL for the Enterprise. http://startupbootcamp.org/ - Öresund - Innovation happens HERE. On Thu, Nov 17, 2011 at 4:04 PM, Marko Rodriguez <okramma...@gmail.com> wrote: > Hey, > > It might be a little too soon to bring it up, but early December, we are > releasing Gremlin Scala in Gremlin 1.4 which will allow you to import Gremlin > into your Scala project (e.g. Neo4j-Scala Wrapper) and evaluate Gremlin > queries natively. > > https://github.com/tinkerpop/gremlin/tree/master/gremlin-scala > > For example, in Gremlin Scala: > > g.v(1).out("knows").out("created").filter{v:Vertex => > v("name").equals("marko")} > > This way Scala developers can use Gremlin-style traversing natively in their > Scala code. > > See ya, > Marko. > > http://markorodriguez.com > > On Nov 17, 2011, at 5:21 AM, Christopher Schmidt wrote: > >> Peter, I think its not possible because "[" and "]" are reserved for Scalas >> type declarations. >> The String (fe. "KNOWS") is implicitly converted >> into DynamicRelationshipType.withName("KNOWS"). >> >> What would be possible to get something like this (which is actually just a >> change of method names): >> >> start - "KNOWS" -> end >> >> Regarding the Cypher language: >> Its an interpreted language, so it is possible to define a completely free >> syntax. In case of Scala, all we are doing has to be fit into the language >> syntax, although it looks like a freely designed DSL. Cypher has some >> similarities to SQL as a special query language. And to be honest, I think >> using it programmatically will cause the same symtoms as SQL with respect >> to runtime errors, type safety, abstraction etc. >> >> Nevertheless, it would be interesting to create a nearly Cypher compilable >> DSL, which includes type safety and transparent DAO or Case Class mapping. >> Something like: >> >> case class User(name:String) >> val nodes = createNode(User("name1")) :: createNode(User("name2")) >> :: createNode(User("name3")) :: Nil >> . . . >> for (f <- START nodes MATCH user-"friend"->follower WHERE follower.name =~ >> /S.*/ RETURN follower) >> println("User Follower: " + f.name) >> >> >> This would be basically the same idea JPA tries with its criteria api. But >> that will be hard work :-) >> >> Christopher >> >> On Wednesday, November 16, 2011, Peter Neubauer wrote: >> >>> Chstopher, >>> this looks really cool! I notice the similarity to the cypher syntax >>> in the ASCII art part of the notation. Do you think there is a chance >>> to make it even more similar to that so you could actually write >>> >>> start -[:KNOWS]-> intermediary - [KNOWS] -> end >>> >>> instead of >>> >>> start --> "KNOWS" --> intermediary --> "KNOWS" --> end ? Would be >>> quite cool to be closely in line with >>> http://docs.neo4j.org/chunked/snapshot/cypher-query-lang.html, maybe >>> we could even use this for a modifying cypher in the future ... >>> >>> Cheers, >>> >>> /peter neubauer >>> >>> GTalk: neubauer.peter >>> Skype peter.neubauer >>> Phone +46 704 106975 >>> LinkedIn http://www.linkedin.com/in/neubauer >>> Twitter http://twitter.com/peterneubauer >>> >>> http://www.neo4j.org - NOSQL for the Enterprise. >>> http://startupbootcamp.org/ - Öresund - Innovation happens HERE. >>> >>> >>> >>> On Wed, Nov 16, 2011 at 6:36 AM, Christopher Schmidt >>> <fakod...@googlemail.com> wrote: >>>> Hi all, >>>> >>>> I released version 0.1.0 of the Neo4j Scala Wrapper neo4j-scala (base is >>>> neo4j-scala by jawher). >>>> Main features are >>>> >>>> - simple Traits for the wrapper itself, GraphDatabaseService provider, >>>> index provider and batch insertion >>>> - transaction wrapping: >>>> >>>> withTx {...} >>>> >>>> - natural usage of relations: >>>> >>>> start --> "KNOWS" --> intermediary --> "KNOWS" --> end >>>> >>>> - setting and getting properties: >>>> >>>> node("foo") = "bar" >>>> node[String]("foo") match { >>>> case Some(x) => println(x) >>>> case None => println("aww") >>>> } >>>> >>>> - easy CaseClass to/from Node/Relation properties marshaling >>>> >>>> withTx { >>>> implicit neo => >>>> // create new Node with Case Class Test >>>> val node1 = createNode(Test("Something", 1, 2, 3.3, 10, true)) >>>> >>>> // or using Option[T] (returning Some[T] if possible) >>>> val nodeOption: Option[Test] = node.toCC[Test] >>>> >>>> // create new relation with Case Class Test >>>> node1 --> "foo" --> node2 < Test("other", 0, 1, 1.3, 1, false) >>>> } >>>> >>>> - transparent batch processing (simply replace 2 traits to use the same >>>> code for batch- and non batch processing) >>>> >>>> For now I am using a simple Github "Maven repository". >>>> Neo4j-scala should be usable with the following POM settings: >>>> <repositories> >>>> <repository> >>>> <id>fakod-releases</id> >>>> <url>https://raw.github.com/FaKod/fakod-mvn-repo/master/releases >>>> </url> >>>> </repository> >>>> </repositories> >>>> >>>> <dependencies> >>>> <dependency> >>>> <groupId>org.neo4j</groupId> >>>> <artifactId>neo4j-scala</artifactId> >>>> <version>0.1.0</version> >>>> </dependency> >>>> </dependencies> >>>> >>>> The Sources are hosted on Github: >>>> >>>> https://github.com/FaKod/neo4j-scala/tree/0.1.0 >>>> >>>> >>>> A simple Matrix example GIST is here: >>>> >>>> https://gist.github.com/1331556 >>>> >>>> >>>> Enjoy... >>>> >>>> >>>> PS: Maybe you are using Neo4j Server via Jersey? So sjersey-client may be >>>> interesting for you as well: see @ >>>> Github<https://github.com/FaKod/sjersey-client/tree/0.1.0> and >>>> this example <https://gist.github.com/1366334>. >>>> >>>> -- >>>> Christopher >>>> twitter: @fakod >>>> blog: http://blog.fakod.eu >>>> >>>> >>>> >>>> -- >>>> Christopher >>>> twitter: @fakod >>>> blog: http://blog.fakod.eu >>>> _______________________________________________ >>>> Neo4j mailing list >>>> User@lists.neo4j.org >>>> https://lists.neo4j.org/mailman/listinfo/user >>>> >>> _______________________________________________ >>> Neo4j mailing list >>> User@lists.neo4j.org >>> https://lists.neo4j.org/mailman/listinfo/user >>> >> >> >> -- >> Christopher >> twitter: @fakod >> blog: http://blog.fakod.eu >> _______________________________________________ >> Neo4j mailing list >> User@lists.neo4j.org >> https://lists.neo4j.org/mailman/listinfo/user > > _______________________________________________ > Neo4j mailing list > User@lists.neo4j.org > https://lists.neo4j.org/mailman/listinfo/user > _______________________________________________ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
