I want to run raw mongoDb queries using runCommand() which takes in BSON data. Following is my code
MongoClient mongoClient = new MongoClient();
MongoDatabase database = mongoClient.getDatabase("MyDB");
MongoCollection<Document> collection = (MongoCollection<Document>)database.runCommand(??);
If my query is
db.mycol.find({"by":"tutorials point"}).
What should be BSON data that I have to pass inside runCommand()? Is it only
{{"by":"tutorials point"}}
or
db.mycol.find({"by":"tutorials point"}).
And If instead of find() i have to use Insert() how to go about it??
Find:
db.runCommand({
find: "mycol",
filter: { by: "tutorials point"}
})
Insert:
db.runCommand({
insert: "mycol",
documents: [ { _id: 1, foo: "bar"} ]
})
I think the easiest why to do it in java is to use Jongo ( http://jongo.org/ ). Syntax is very similar to mongo shell.
jongo.runCommand("{find: 'mycol', filter: { by: 'tutorials point'}}")
You can not do that. First of all you need to get your collection
like : MongoCollection<Document> collection = database.getCollection("test");
Once you have the collection
you can run the raw query by using the util import com.mongodb.util.JSON;
this would be an example that you want to do:
MongoClient mongoClient = new MongoClient();
MongoDatabase database = mongoClient.getDatabase("MyDB");
MongoCollection<Document> collection = database.getCollection("mycol");
String rawQuery = "{\"by\": \"tutorials point\"}";
DBObject query = (DBObject) JSON.parse(rawQuery);
collection.find(query);
Give example of how it work this was my query
db.getCollection('Collection').aggregate([{
$unwind: '$somearray'
}, {
$match: {
_id: ObjectId("123456"),
'somearray.type': "blabla"
}
}, {
$project: {
'_id':0,
'name': '$somearray.name',
'phone': '$phone'
}
}])
This was my Java program that did the same as query
public MongoIterable < Document > GetList(String collectionName, String id) {
MongoClient mongoClient = new MongoClient();
MongoDatabase database = mongoClient.getDatabase("MyDB");
MongoCollection < Document > collection = database.getCollection("collectionName");
Document match = Document.parse("{_id: ObjectId('" + id + "'),'somearray.type': 'blabla'}");
Document project = Document.parse("{ $project: { _id: 0,'name': '$somearray.name'}, 'phone': '$phone'}");
MongoIterable < Document > output = collection.aggregate(Arrays.asList(Aggregates.unwind("$somearray"), Aggregates.match(match), project));
return output;
}
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