I want to parse a java string to mongo DBObject or BasicDBObject as below.
List<DBObject> query = new ArrayList<DBObject>();
String allQry = "{ \"$match\" : { \"CUSTOMERID\" : { \"$gt\" : 10}}}, { \"$project\" : { \"CUSTOMERNAME\" : 1 , \"COUNTRY\" : 1 , \"CUSTOMERID\" : 1}},{ \"$sort\" : { \"COUNTRY\" : 1}}";
BasicDBObject dbobj = BasicDBObject.parse(allQry);
query.add(dbobj);
System.out.println("qqqquery : "+query);
Cursor aggCur = collection.aggregate(query, aggOpt);
After run above example codes, it outputs qqqquery : [{ "$match" : { "CUSTOMERID" : { "$gt" : 10}}}]. There are $match , $project and $sort in allQry. Why do not it includes $project and $sort in this query? It only includes $match, who can help to check this reason? Thanks.
Following this tutorial:
http://pingax.com/trick-convert-mongo-shell-query-equivalent-java-objects/
you could add all parts of your query like this:
MongoClient mongo = new MongoClient();
DB db = mongo.getDB("pingax");
DBCollection coll = db.getCollection("aggregationExample");
/*
MONGO SHELL : db.aggregationExample.aggregate(
{$match : {type : "local"}} ,
{$project : { department : 1 , amount : 1 }}
);
*/
DBObject match = new BasicDBObject("$match", new BasicDBObject("type", "local"));
DBObject project = new BasicDBObject("$project", new BasicDBObject("department", 1).append("amount", 1));
AggregationOutput output = coll.aggregate(match,project,group,sort);
Related:
How to find documents matching multiple criteria
Executing Mongo like Query (JSON)through Java
Related
I have tried to fetch data for the particular column value in the mongo document but its displaying whole data.
Following is the mongo document:
{
"_id" : ObjectId("59db2321811a592384865711"),
"User_ID" : "demo",
"Project_ID" : "demo-1",
"Project_Information" : {
"Project_Description" : "Sample",
"Primary_Building_Type" : "Office",
"State" : "AR",
"Analysis_Type" : "1",
"Project_Billing_Number" : "WY",
"Country" : "USA",
"Climate_Zone" : "3A",
"Zip_Code" : "71611"
"City" : "WA",
"Units" : "IP"
}
}
I want to fetch the following output:
[
{
"User_ID": "demo",
"Project_Description": "Sample"
}]
I have tried using dot: Project_Information.Project_Description.The code is as below:
public Object[] addDemo1(String User_ID) throws Exception {
DB db = ConnectToDB.getConnection();
Properties prop = new Properties();
InputStream input = null;
input = GetProjectStatus.class.getClassLoader().getResourceAsStream("config.properties");
prop.load(input);
String col = prop.getProperty("COLLECTION_PI");
System.out.println("data is.." + col);
DBCollection collection = db.getCollection(col);
BasicDBObject obj = new BasicDBObject();
BasicDBObject fields = new BasicDBObject();
BasicDBObject fields2 = new BasicDBObject();
List<DBObject> obj1 = null;
if (User_ID != null && !User_ID.equals("") && User_ID.length() > 0) {
obj.put("User_ID", User_ID);
fields.put("_id", 0);
fields.put("User_ID", 1);
fields.put("Project_ID", 1);
fields.append("Project_Information.Project_Description", "Project_Description");
BasicDBObject fields1 = new BasicDBObject();
fields1.put("User_ID", User_ID);
}
DBCursor cursor = collection.find(obj, fields);
System.out.println("count is:" + cursor.count());
obj1 = cursor.toArray();
System.out.println("" + obj1);
cursor.close();
db.getMongo().close();
return obj1.toArray();
}
But it displays the whole structure of Project_Information.
Please specify how to achieve this. Thanks for help.
Using a 2.x MongoDB Java Driver
Here's an example using the MongoDB 2.x Java driver:
DBCollection collection = mongoClient.getDB("stackoverflow").getCollection("demo");
BasicDBObject filter = new BasicDBObject();
BasicDBObject projection = new BasicDBObject();
// project on "Project_Information.Project_Description"
projection.put("Project_Information.Project_Description", 1);
DBCursor documents = collection.find(filter, projection);
for (DBObject document : documents) {
// the response contains a sub document under the key: "Project_Information"
DBObject projectInformation = (DBObject) document.get("Project_Information");
// the "Project_Description" is in this sub document
String projectDescription = (String) projectInformation.get("Project_Description");
// prints "Sample"
System.out.println(projectDescription);
// to return this single String value in an Object[] (as implied by your OP) just do create the Object[] like this and then return it ...
Object[] r = new Object[] {projectDescription};
// prints the entire projected document e.g.
// { "_id" : { "$oid" : "59db2321811a592384865711" }, "Project_Information" : { "Project_Description" : "Sample" } }
System.out.println(document.toString());
}
Using a 3.x MongoDB Java Driver
Here's an example using the MongoDB 3.x Java driver:
// this finds all documents in a given collection (note: no parameter supplied to the find() call)
// and for each document it projects on Project_Information.Project_Description
FindIterable<Document> documents =
mongoClient.getDatabase("...").getCollection("...")
.find()
// for each attrbute you want to project you must include its dot notation path and the value 1 ...
// this is the equivalent of specifying {'Project_Information.Project_Description': 1} in the MongoDB shell
.projection(new Document("Project_Information.Project_Description", 1));
for (Document document : documents) {
// the response contains a sub document under the key: "Project_Information"
Document projectInformation = (Document) document.get("Project_Information");
// the "Project_Description" is in this sub document
String projectDescription = projectInformation.getString("Project_Description");
// prints "Sample"
System.out.println(projectDescription);
// to return this single String value in an Object[] (as implied by your OP) just do create the Object[] like this and then return it ...
Object[] r = new Object[] {projectDescription};
// prints the entire projected document e.g. { "_id" : { "$oid" : "59db2321811a592384865711" }, "Project_Information" : { "Project_Description" : "Sample" } }
System.out.println(document.toJson());
}
Java libraries won't let you directly access using dot.
They have build in getter and setter methods.
You have not mentioned which package you are using.
Here's the query that you need:
db.mycol.find({},{User_ID:1,"Project_Information.Project_Description":1})
It will give:
{ "_id" : ObjectId("59db2321811a592384865711"),
"User_ID" : "demo",
"Project_Information" : { "Project_Description" : "Sample" }
}
You will have to convert the query in whatever format your package accepts.
Here's a tutorial:
https://www.mongodb.com/blog/post/getting-started-with-mongodb-and-java-part-i
when i use this query on mongo shell
db.matchgrup.aggregate([{$match:{ "longitude" : {"$gte":73.8172198689148,"$lte":73.8200133489148}, "latitude" :{"$gte":19.98591316489416,"$lte":19.98870664489416} }},{ "$group": {"_id":null, "band_4" : { "$avg" : "$band_4"},"band_8":{"$avg":"$band_8"} } }])
it return
{ "_id" : null, "band_4" : 1578.8266666666666, "band_8" : 2649.0155555555557 }
but when i used mongo java driver for same query
searchQuery1 =new BasicDBObject("longitude", new BasicDBObject("$gte", X.doubleValue()).append("$lte", px1.doubleValue()));
criteria.add(searchQuery1);
searchQuery2=new BasicDBObject("latitude", new BasicDBObject("$gte", py2.doubleValue()).append("$lte", Y.doubleValue() ));
criteria.add(searchQuery2);
query2=new BasicDBObject("$and",criteria);
group1 = new BasicDBObject();
group1.put("_id", null);
group1.put("band_4", new BasicDBObject("$avg", "$band_4"));
group1.put("band_8", new BasicDBObject("$avg", "$band_8"));
output = coll.aggregate(
new BasicDBObject("$match",query2),
new BasicDBObject("$group",group1));
for (DBObject doc : output.results()) {
band4=(Double)doc.get("band_4");
band8=(Double)doc.get("band_8");
}
and it doesn't retuen any value and doesnt goes inside of for loop of doc
can anybody help me out what m doing wrong
I am trying to create this query from Java for MongoDB.
Do you know how can I construct it in java?
db.node.find({
connectedWithIds: { $in: [
ObjectId('56bca32fe74a987ad8724da1')
] }
})
I tried to use this:
ObjectId arr[] = {new ObjectId("5409ae2e2cdc31c5aa0ce0a5")};
BasicDBObject inQuery = new BasicDBObject("$in", arr);
BasicDBObject query = new BasicDBObject("connectedWithIds", inQuery);
but the results is below:
{ "connectedWithIds" : { "$in" : [ { "$oid" : "5409ae2e2cdc31c5aa0ce0a5"}]}}
and occurs this error:
error: {
"$err" : "Can't canonicalize query: BadValue cannot nest $ under $in",
"code" : 17287
}
I could overcome this error with the code below:
ArrayList<ObjectId> vals = new ArrayList<ObjectId>();
vals.add(objectId);
BasicDBObject inQuery = new BasicDBObject("$in", vals);
BasicDBObject query = new BasicDBObject("connectedWithIds", inQuery);
List<BasicDBObject> users = (List<BasicDBObject>) customQueryManager.executeQuery("node", query);
I am having hard time converting the below nested mongodb query with $and and $or to java/groovy
db.personSync.find({
$and:[
{$or:[
{ "name" : { "$regex" : "(?i)^test1" , "$options" : "i"}},
{ "name" : { "$regex" : "(?i)^dev" , "$options" : "i"}}
]},
{ "email" : { "$regex" : "(?i)^test" , "$options" : "i"}}
]}
);
]}
);
I was able to write code for $or part as below
def mongoCritera = new ArrayList<BasicDBObject>();
mongoCritera.add('name', java.util.regex.Pattern.compile('(?i)^test1`'))
mongoCritera.add('name', java.util.regex.Pattern.compile('(?i)^dev`'))
def query = new BasicDBObject("\$or", mongoCritera);
collection.find(query);
But I couldn't accommodate $and logic, can someone please help me with this?
def andCritera = new ArrayList<BasicDBObject>();
def orCritera1= new ArrayList<BasicDBObject>();
orCritera1.add('name', java.util.regex.Pattern.compile('(?i)^test1`'))
orCritera1.add('name', java.util.regex.Pattern.compile('(?i)^dev`'))
def orQuery1 = new BasicDBObject("\$or", orCritera1);
andCritera.add(orQuery1)
def orCritera2= new ArrayList<BasicDBObject>();
orCritera1.add('email', java.util.regex.Pattern.compile('(?i)^test`'))
def orQuery2 = new BasicDBObject("\$or", orCritera2);
andCritera.add(orQuery2)
def query = new BasicDBObject("\$and", andCritera);
def cursor = collection.find(query)
while (cursor.hasNext()) {
println 'person '+ cursor.next();
}
As per my understanding you wants to write a query fetch
name should be start from (test1 or dev) case insensitive and email start with test (also case insensitive) ? if yes try this
db.personSync.find({$and:[{name:{"$regex":"^[test|dev]","$options":"i"}},{email:{"$regex":"^test1","$options":"i"}}]})
public static void main(String[] args) {
MongoClient c = new MongoClient();
MongoDatabase db = c.getDatabase("test");
MongoCollection<Document> collection = db.getCollection("so3");
ArrayList<Document> andCritera = new ArrayList<Document>();
ArrayList<Document> orCritera1= new ArrayList<Document>();
orCritera1.add(new Document("name", java.util.regex.Pattern.compile("(?i)^[test1|dev]")));
Document orQuery1 = new Document("$or", orCritera1);
andCritera.add(orQuery1);
andCritera.add(new Document("email", java.util.regex.Pattern.compile("(?i)^test")));
Document query = new Document("$and", andCritera);
ArrayList<Document> docList = new ArrayList<Document>();
collection.find(query).into(docList);
for(Document doc:docList){
System.out.println(doc);
}
}
I validated this is working fine :)
In the following query , I'm doing addition to a field (This field having ISO date as value) then extracting hour from that field, then group by on hour
db.campaigns.aggregate([
{$group : { _id: {$hour:{$add:['$time', 19800000]}}}}
])
Sample record of the collection
db.campaigns.findOne()
{
"_id" : ObjectId("53c7afdab92be74745af9068"),
"time" : ISODate("2013-03-08T12:25:24.973Z"),
"type" : "annoying",
"PINGS" : 143
}
The above one is working fine in Mongo shell,
I'm trying write this query in Java
Here is my partial Java code
DBObject group2Fields = new BasicDBObject();
group2Fields.put("hour", new BasicDBObject("$hour", new BasicDBObject("$add",new BasicDBObject("time",19800000))));
DBObject group2 = new BasicDBObject("_id", group2Fields);
DBObject secondGroup = new BasicDBObject("$group", group2);
I'm getting "errmsg" : "exception: field inclusion is not allowed inside of $expressions"
try this:
DBObject group2Fields = new BasicDBObject();
BasicDBList addObjects = new BasicDBList();
addObjects.add("$time");
addObjects.add(19800000);
group2Fields.put("$hour", new BasicDBObject("$add", addObjects));
DBObject group2 = new BasicDBObject("_id", group2Fields);
DBObject secondGroup = new BasicDBObject("$group", group2);
Nesting calls in your code generally helps you to "visualise" the structure that you want:
BasicDBList addArgs = new BasicDBList();
addArgs.add("$time");
addArgs.add(19800000);
DBObject group = new BasicDBObject("$group",
new BasicDBObject("_id",
new BasicDBObject("$hour",
new BasicDBObject("$add", addArgs)
)
)
);
Which of course produces a group variable that serializes like so:
{ "$group" : { "_id" : { "$hour" : { "$add" : [ "$time" , 19800000]}}}}