[Neo4j] Transactions and creating new nodes
It's possible that I haven't looked to hard, but my question is this: A typical scenario for a site is to create a user. Before you create a user, you do this in a transaction: - begin transaction - check if such a user (node in neo4j) exists - if it exists, end transaction - return - if such a user doesn't exist, create a new user(node) - end transaction - return Can a separate thread create a new node while I'm in a transaction? If it can, how can I prevent that thread from creating a user with the user name I'm about to create? ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Transactions and creating new nodes
Hi Dmitrii, Separate threads can create nodes in different transactions, yes. You could lock around the user creation code you included in order to keep user creation atomic. David On Fri, Jul 16, 2010 at 10:59 AM, Dmitrii Dimandt dmitr...@gmail.comwrote: It's possible that I haven't looked to hard, but my question is this: A typical scenario for a site is to create a user. Before you create a user, you do this in a transaction: - begin transaction - check if such a user (node in neo4j) exists - if it exists, end transaction - return - if such a user doesn't exist, create a new user(node) - end transaction - return Can a separate thread create a new node while I'm in a transaction? If it can, how can I prevent that thread from creating a user with the user name I'm about to create? ___ 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
Re: [Neo4j] Transactions and creating new nodes
Thank you for clarification! Hi Dmitrii, Separate threads can create nodes in different transactions, yes. You could lock around the user creation code you included in order to keep user creation atomic. David On Fri, Jul 16, 2010 at 10:59 AM, Dmitrii Dimandt dmitr...@gmail.comwrote: It's possible that I haven't looked to hard, but my question is this: A typical scenario for a site is to create a user. Before you create a user, you do this in a transaction: - begin transaction - check if such a user (node in neo4j) exists - if it exists, end transaction - return - if such a user doesn't exist, create a new user(node) - end transaction - return Can a separate thread create a new node while I'm in a transaction? If it can, how can I prevent that thread from creating a user with the user name I'm about to create? ___ 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
