How to search a document and remove field from it in mongodb using java? -

-

i have device collection.

{    "_id" : "10-100-5675234",    "_type" : "device",    "alias" : "new alias name",     "claimcode" : "fg755df8n",     "hardwareid" : "serail02",    "isclaimed" : "true",    "model" : "vmb3010",     "userid" : "5514f428c7b93d48007ac6fd"   }

i want search document _id , update after removing field userid result document. trying different ways none of them working. please me.

you can remove field using $unset mongo-java driver in way:

    mongoclient mongo = new mongoclient("localhost", 27017);     db db = (db) mongo.getdb("testdb");     dbcollection collection = db.getcollection("collection");     dbobject query = new basicdbobject("_id", "10-100-5675234");     dbobject update = new basicdbobject();     update.put("$unset", new basicdbobject("userid",""));     writeresult result = collection.update(query, update);     mongo.close();

find out more @ : http://www.journaldev.com/4334/mongodb-update-document-set-all-example-mongo-shell-java-driver


Comments

Post a Comment

Popular posts from this blog

How to run C# code using mono without Xamarin in Android? -

-
i want create program uses mono runtime run c# code (binary not application). i copied libmono.so unity app , i'm write code using documentation: http://www.mono-project.com/docs/advanced/embedding/ and it's working have problems references can access classes mscorlib.dll , have problems system.reflection.assembly class throwing exception, when print console see: system.missingmethodexception: method not found: 'system.reflection.assembly.op_inequality' can fix it? can use mono runtime in c binary on android? ps. i'm using android tests. edit: found solution loading libraries, need set environment variable mono_path libraries path. but have still problems assembly class. the system.missingmethodexception error have seems .net profile mismatch error, 1 explained here . can use mono runtime in c binary on android? yes, using ndk guess. there alternatives can use instead of rolling own, such xmadevlab .
Read more

html - grunt SVG to webfont -

-
i'm trying generate webfont svgs using grunt-webfont . the issue need task valid on windows , linux machines. in order achieve need use node engines doesn’t work svg files . i know if there way convert svgs proper svg format supported grunt plugin or alternatively there better grunt plugin/s achieve this i have task able take svgs (created in illustrator) , output webfont files (.eot,.svg,.svg,...) , css file (like icomoon export) thanks. perhaps artboard small. recommend checking have 512pt x 512pt artboard each icon. stumbled upon gem ( https://www.fourdigits.nl/blog/using-a-webfont-to-display-icons ) when grunt-webfont documentation left me alone in forest.
Read more

python - Specify path of savefig with pylab or matplotlib -

-
i struggling on how find correct way specify save path (or repository) when calling function savefig in matplotlib or pylab. i tried several syntaxes, everytime python console returns : filenotfounderror: [errno 2] no such file or directory: '../mydocs/resource/frames/myimage.png' currently, have written following : pylab.savefig('../mydocs/resource/frames/myimage.png') does know how it? thanks in advance! the tilde operator , variable $home entered strings , therefore not function while saving. have provide either relative path (as did) or provide full path. eg. pylab.savefig("/home/username/desktop/myfig.png") .
Read more