Can not delete the collection from the shell,
The thing that the collection is available and my php script is accessing it (selecting|updating)
But when I used:
db._registration.drop()
it gives me an error:
Date, JS Error: TypeErrorL db._registration has no properties (shell): 1
The problem is not with deleting the collection. The problem is with accessing the collection. So you would not be able to update, find or do anything with it from the shell. As it was pointed in mongodb JIRA, this is a bug when a collection has characters like _, - or .
Nevertheless this type of names for collections is acceptable, but it cause a problem in shell.
You can delete it in shell with this command:
db.getCollection("_registration").drop()
or this
db['my-collection'].drop()
but I would rather rename it (of course if it is possible and will not end up with a lot of changing).
You can also use:
db["_registration"].drop()
which syntax works in JS as well.
For some reason the double quotes "_registration" did not workfor me .. but single quote '_registration' worked
Related
Is there a way to tell Mongo to pretty print output? Currently, everything is output to a single line and it's difficult to read, especially with nested arrays and documents.
(note: this is answer to original version of the question, which did not have requirements for "default")
You can ask it to be pretty.
db.collection.find().pretty()
You can add
DBQuery.prototype._prettyShell = true
to your file in $HOME/.mongorc.js to enable pretty print globally by default.
(note: this is answer to the updated question)
You can just do this on the CLI:
echo DBQuery.prototype._prettyShell = true >> ~/.mongorc.js
And it's always going to output pretty results.
Since it is basically a javascript shell, you can also use toArray():
db.collection.find().toArray()
However, this will print all the documents of the collection unlike pretty() that will allow you to iterate.
Refer: http://docs.mongodb.org/manual/reference/method/cursor.toArray/
Oh so i guess .pretty() is equal to:
db.collection.find().forEach(printjson);
Give a try to Mongo-hacker(node module), it alway prints pretty.
https://github.com/TylerBrock/mongo-hacker
More it enhances mongo shell (supports only ver>2.4, current ver is 3.0), like
Colorization
Additional shell commands (count documents/count docs/etc)
API Additions (db.collection.find({ ... }).last(), db.collection.find({ ... }).reverse(), etc)
Aggregation Framework
I am using for while in production env, no problems yet.
Got to the question but could not figure out how to print it from externally-loaded mongo. So:
This works is for console: and is prefered in console, but does not work in external mongo-loaded javascript:
db.quizes.find().pretty()
This works in external mongo-loaded javscript:
db.quizes.find().forEach(printjson)
Check this out:
db.collection.find().pretty()
Is there any scenario that explains why the update is not working, I can't seem to pinpoint the cause and I don't see any errors whatsoever. Is there a way to check the output of the update function because currently the update is not doing anything. That means the last log line shows a value different than 20170615-7702.
Db.find().forEach(function(item){
console.log(item._id+ " =======> " + item.build.parameters.BUILD_NUM);
Db.update({"_id":item._id}, {$set:{"build.parameters.BUILD_NUM":"20170615-7702"}});
console.log(Db.findOne({"_id": item._id}).build.parameters.BUILD_NUM);});
Thank you
The code above should work. I think that the problem above is that it is not able to update the document as fast as it prints the output. First try:
var itemUpdated = Db.findOne({"_id": item._id});
console.log(itemUpdated._id)
The other option is very simple go to the command line and run meteor mongo. Then see all the entries in the collection and their properties.
Third and maybe the best option to test here is to use setTimeout() for the console.log().
Hope it helps.
I have a collection named GoldenGlobes-emotion in my MongoDB 2.6.9
I found I can not access this collection from the MongoDB shell
When ever I try to access the collection, for example
db.GoldenGlobes-emotion.findOne()
I always got this:
ReferenceError: emotion is not defined
But it works well when I access the collection form Python with PyMongo.
Is this a shell bug?
Or '-' is a reserved character？
Try db["GoldenGlobes-emotion"].findOne().
The MongoDB shell is a Javascript interpreter. Javascript does not allow hyphens in variable names, because it interprets them as the minus-operator. However, you can also access object-fields with string literals by using the array-syntax. In that case, this restriction does not apply.
I would like to save some variables in Julia to a database using MongoDB. I ran into a problem when using the following function:
insert(client, "myDB.rawInfo", { "raw" => status})
This works when saving simple information, like strings or ints. However, status is of type Array{Any,1}. When saving, I get the following error message:
`build` has no method matching build(::Ptr{None}, ::Dict{String,Any})
while loading In[256], in expression starting on line 18
in append at C:\Users\Guido\.julia\v0.3\Mongo\src\BSON.jl:225
in append at C:\Users\Guido\.julia\v0.3\Mongo\src\BSON.jl:231 (repeats 2 times)
in build at C:\Users\Guido\.julia\v0.3\Mongo\src\BSON.jl:207
in BSONObject at C:\Users\Guido\.julia\v0.3\Mongo\src\BSON.jl:82
in find_one at C:\Users\Guido\.julia\v0.3\Mongo\src\Mongo.jl:30
in find_one at C:\Users\Guido\.julia\v0.3\Mongo\src\Mongo.jl:34
Can anyone help me?
There seems to be something wrong with the MongoDB package for Julia which causes the malfunction of nested variables. A fix has been made a while ago and can be applied by manually reinstalling this version of MongoDB for Julia (first uninstall, than manually reinstall): https://github.com/rened/Mongo.jl
I need to find out distinct values(for example : CreationDate or SourceSystem) in MongoDB using MongoVUE. FYI, I can only use the trial version of the same.
I don't think you can do that using MongoVUE. You can do it through MongoDB shell running a command like this:
db.[Collection Name].distinct({Property Name})
ex: db.students.distinct('age')
db.students.distinct('age').length; // gives you the record count
I usually find SQL to Mongo Mapping Chart page useful in these case ( http://www.mongodb.org/display/DOCS/SQL+to+Mongo+Mapping+Chart )
From having a quick look, I can't see how you can either, as the "Find" feature forces you to use:
db.[collectionName].find({...})
so doesn't allow you to do:
db.[collectionName].distinct({...})
I recommend using the normal command line executable for Mongo instead of MongoVUE, then you can use the commands from the 10Gen documentation:
http://www.mongodb.org/display/DOCS/Aggregation#Aggregation-Distinct