This is my code (I didn't use actually Book and Author tables, I used my domain specific tables, but here I illustrated problem with these common names to make it easier to understand). This works, but my question is could this be done using just ETL without any coding.
Map<Integer, Vertex> bookMap = new HashMap<>(); String queryString = "SELECT * FROM Books"; Statement statement = connection.createStatement(); ResultSet rs = statement.executeQuery(queryString); while (rs.next()) { Vertex bookVertex = graph.addVertex("class:Book"); Integer bookId = rs.getInt(1); bookVertex.setProperty(...); // fill vertex from result set bookMap.put(bookId, bookVertex); } rs.close(); statement.close(); Map<Integer, Vertex> authorMap = new HashMap<>(); queryString = "SELECT * FROM Authors"; statement = connection.createStatement(); rs = statement.executeQuery(queryString); while (rs.next()) { Vertex authorVertex = graph.addVertex("class:Author"); Integer authorId = rs.getInt(1); authorVertex.setProperty(...); // fill vertex from result set authorMap.put(authorId, authorVertex); } rs.close(); statement.close(); graph.commit(); queryString = "SELECT * FROM BookAuthor"; statement = connection.createStatement(); rs = statement.executeQuery(queryString); while (rs.next()) { Integer bookId = rs.getInt(2); Integer authorId = rs.getInt(2); Edge edge = graph.addEdge(null, bookMap.get(bookId), authorMap.get(authorId), "BookAuthor"); edge.setProperty(....); } rs.close(); statement.close(); graph.commit(); On Monday, 20 October 2014 20:51:22 UTC+2, Lvc@ wrote: > > @Bojan, How did you import edges? Can you share the code? It's hard to > help without any information. > > Lvc@ > > > On 20 October 2014 13:31, 'Curtis Mosters' via OrientDB < > orient-...@googlegroups.com <javascript:>> wrote: > >> Is you code secret? I still don't understand the real issue you have, >> sorry. >> >> Am Montag, 20. Oktober 2014 15:26:27 UTC+2 schrieb Bojan Vukotić: >> >>> >>> Well, that's exactly what I need (and what I already did). I thought >>> maybe that ETL has some API that we could use to make this easier (I used >>> 'pure' OrientDB API to implement this) >>> >>> >>> >>> On Monday, 20 October 2014 15:15:27 UTC+2, Curtis Mosters wrote: >>>> >>>> I think I don't understand your issue: >>>> >>>> First of all you import all Books. So you have all the data in there. >>>> Now setting an index on the Book.ID. >>>> >>>> After that the Authors are imported. They are matched with the ID of >>>> the Book. I think in your case the Author matched with a Book is the same >>>> like the Book.ID? Or do you have another file containing the relations of >>>> the ID's? >>>> >>>> Can you post here the first 10 lines of each file maybe? That would >>>> help a low. >>>> >>>> Am Montag, 20. Oktober 2014 14:55:10 UTC+2 schrieb Bojan Vukotić: >>>>> >>>>> I took example from here http://www.orientechnologies. >>>>> com/docs/last/orientdb-etl.wiki/Import-from-DBMS.html >>>>> >>>>> When can I find ETL/Java example? >>>>> >>>>> >>>>> >>>>> On Monday, 20 October 2014 14:43:11 UTC+2, Curtis Mosters wrote: >>>>>> >>>>>> Well I think it's way better to create a Java example. Then you >>>>>> understand what is happening in the background. Otherwhise in my tests >>>>>> the >>>>>> ETL way had the same speed, but these tests are 3-4 month old. I will >>>>>> redo >>>>>> them soon. Did you take the example of ETL from OrientDB? Otherwhise >>>>>> look >>>>>> above for some examples. Or even post yours here? >>>>>> >>>>>> Am Montag, 20. Oktober 2014 12:36:57 UTC+2 schrieb Bojan Vukotić: >>>>>>> >>>>>>> >>>>>>> I prefer do it with ETL, if it is possible, I would like to avoid >>>>>>> programming. If not, Java is also a good solution. >>>>>>> >>>>>>> So, example how to do it in ETL? And regarding ETL, I was playing >>>>>>> with it, it imports vertices nicely, but when I want to import edges >>>>>>> (100 >>>>>>> 000 of them) it is extremely slow :( How to improve this? >>>>>>> >>>>>>> >>>>>>> >>>>>>> On Monday, 20 October 2014 12:16:08 UTC+2, Curtis Mosters wrote: >>>>>>>> >>>>>>>> Well you have several ways. Do you want to do it with JAVA oder the >>>>>>>> ETL plugin? >>>>>>>> >>>>>>>> In any case I think it should be >>>>>>>> >>>>>>>> Vertices: Author, Book >>>>>>>> Edge: WROTE >>>>>>>> >>>>>>>> WDYT? >>>>>>>> >>>>>>>> Am Montag, 20. Oktober 2014 10:51:03 UTC+2 schrieb Bojan Vukotić: >>>>>>>>> >>>>>>>>> Hi guys! >>>>>>>>> >>>>>>>>> The whole discussion here is how to create edges from one table to >>>>>>>>> another, but what to do if we have more complex cases where we have >>>>>>>>> connected 2 (or even more) tables? Example, n:n relation: book and >>>>>>>>> authors, >>>>>>>>> book can have one or more authors and author can work on one or more >>>>>>>>> books. >>>>>>>>> >>>>>>>>> Tables: >>>>>>>>> >>>>>>>>> Book { >>>>>>>>> book_id >>>>>>>>> book_name, >>>>>>>>> .... >>>>>>>>> } >>>>>>>>> >>>>>>>>> Author { >>>>>>>>> author_id, >>>>>>>>> author_name, >>>>>>>>> ...... >>>>>>>>> } >>>>>>>>> >>>>>>>>> >>>>>>>>> Author_on_Book { >>>>>>>>> ab_id, >>>>>>>>> book_id, >>>>>>>>> author_id, >>>>>>>>> description // describes what this author did on this book >>>>>>>>> } >>>>>>>>> >>>>>>>>> How to migrate this case? Should "Author_on_Book" be migrated as a >>>>>>>>> vertex or edge? How to write scripts in this case? (in real life we >>>>>>>>> could >>>>>>>>> have even more foreign keys in "Author_on_Book" table ) >>>>>>>>> >>>>>>>>> >>>>>>>>> -- >> >> --- >> You received this message because you are subscribed to the Google Groups >> "OrientDB" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to orient-databa...@googlegroups.com <javascript:>. >> For more options, visit https://groups.google.com/d/optout. >> > > -- --- You received this message because you are subscribed to the Google Groups "OrientDB" group. To unsubscribe from this group and stop receiving emails from it, send an email to orient-database+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.