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Type:
Improvement
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Resolution: Done
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Priority:
Minor - P4
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Affects Version/s: None
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Component/s: API, Documentation
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Labels:None
Hi Sam,
The Java API documentation for the call getCollection(java.lang.String) are incorrect. It does not actually create the collection when called. The actual (and expected behaviour I believe) is that the collection is actually only created when the first document is inserted into it.
The behaviour can be replicated with this simple java example:
import com.mongodb.*; import java.net.UnknownHostException; public class JavaSimpleExample { // Extra helper code public static void main(String[] args) throws UnknownHostException{ MongoClientURI uri = new MongoClientURI("mongodb://localhost:27017/test"); System.out.println(uri); MongoClient client = new MongoClient(uri); System.out.println(client); DB db = client.getDB(uri.getDatabase()); System.out.println(db); DBCollection c = db.getCollection("ing"); System.out.println(c); client.close(); } }
which outputs to the console:
mongodb://localhost:27017/test Mongo{authority=MongoAuthority{type=Direct, serverAddresses=[localhost:27017], credentials={credentials={}}}, options=MongoOptions{description='null', connectionsPerHost=100, threadsAllowedToBlockForConnectionMultiplier=5, maxWaitTime=120000, connectTimeout=10000, socketTimeout=0, socketKeepAlive=false, autoConnectRetry=false, maxAutoConnectRetryTime=0, slaveOk=false, readPreference=primary, dbDecoderFactory=DefaultDBDecoder.DefaultFactory, dbEncoderFactory=DefaultDBEncoder.DefaultFactory, safe=false, w=0, wtimeout=0, fsync=false, j=false, socketFactory=javax.net.DefaultSocketFactory@2d35dd72, cursorFinalizerEnabled=true, writeConcern=WriteConcern { "getlasterror" : 1} / (Continue on error? false), alwaysUseMBeans=false, requiredReplicaSetName=null}} test ing
and in a connected Mongo shell to the mongod:
MongoDB shell version: 2.6.3 connecting to: test -------------------------------------- Host: Eoins-MacBook-Pro.local -------------------------------------- admin (empty) local 0.078125GB test (empty) -------------------------------------- test> use test switched to db test test> show collections test> db.ing.find() test> show collections test> exit
Thanks!
Eoin