Neo4j – How to delete unused property keys from browser?
You should be able to clear everything out by: stopping your Neo4j database deleting everything matching data/graph.db/* (look inside the graph.db folder) starting up again.
nosql
What .NET-compatible graph database solution(s) have a proven track record?
Trying to implement a graph database in Mongo is a rabbit hole that’s been tried before. See this message from the TinkerPop user group: https://groups.google.com/d/msg/gremlin-users/_zweYGxR8wM/0AUu-UoqTRIJ Microsoft’s Trinity graph is an internal project not available for download: http://research.microsoft.com/en-us/projects/trinity/ Neo4j Server (http://neo4j.org) paired with Romiko and Tatham’s .NET client (http://hg.readify.net/neo4jclient/wiki/Home) is a popular combination. Neo4j scales to … Read more
$or statement in $elemMatch
Sure it is, just clearing up the syntax but you basically had it: { “opened”: { “$elemMatch”: { “closed”: false, “$or”: [ { “openingEvening”: { “$lte”: currentTime }, “closingEvening”: { “$gte”: currentTime } }, { “openingMorning”: { “$lte”: currentTime }, “closingMorning”: { “$gte”: currentTime } } ] } } } And given a sample idea … Read more
Recommended NoSQL Database for use with Python [closed]
Most of the nosql databases have python clients which are actively supported. Pick your database based on your usage needs. Using it from python shouldn’t be a problem. To name a few: Cassandra: https://github.com/datastax/python-driver Riak: https://github.com/basho/riak-python-client MongoDB: http://api.mongodb.org/python/current/ CouchDB: http://wiki.apache.org/couchdb/Getting_started_with_Python Redis: https://github.com/andymccurdy/redis-py
Graph DBs vs. Document DBs vs. Triplestores
I’m not sure I would agree with the sentiment that a lot of people don’t like SPARQL. SPARQL 1.0 did have some short comings, but it quite nicely addressed what it was designed for, and the new iteration, SPARQL 1.1, builds upon it adding many constructs from SQL that people expected to see in the … Read more
A timeout occured after 30000ms selecting a server using CompositeServerSelector
Add “?connect=replicaSet” to the end of your connection string if connecting to MongoLab. new MongoClient(“mongodb://username:[email protected]:11111/db-name?connect=replicaSet”) This JIRA ticket has some details: https://jira.mongodb.org/browse/CSHARP-1160 Basically the default is to connect to a replica set member. But MongoLab’s Single-Node settings are actually a single node replica set and this causes us to not trust it. Appending ?connect=replicaSet to … Read more
Mongoose populate embedded
As of Mongoose 3.6 the ability to recursively populate related documents in a query has been added. Here is an example of how you might do it: UserList.findById(listId) .populate(‘refUserListItems’) .exec(function(err, doc){ UserListItem.populate(doc.refUserListItems, {path:’refSuggestion’}, function(err, data){ console.log(“User List data: %j”, doc); cb(null, doc); } ); }); In this case, I am populating an array of id’s … Read more