I'm trying to get the order number where a transactionId is equal to another variable I have in my code. My tolls.booths collection looks like this
In my code,
def boothsException = booths.find([ "pings.loc.transactionId": tollEvent.id, "pings.loc.order":1] as BasicDBObject).iterator()
println boothsException
I am getting boothsException = DBCursor{collection=DBCollection{database=DB{name='tolls'}
I would like to essentially say get where transactionId = 410527376 and give me that order number in boothsException (5233423).
This is using MongoDB Java Driver v3.12.2.
The code extracts the value from the returned cursor. I am using newer APIs, so you will find some differences in class names.
int transId = 410527376; // same as tollEvent.id
MongoCursor<Document> cursor = collection
.find(eq("pings.loc.transactionId", transId))
.projection(fields(elemMatch("pings.loc.transactionId"), excludeId()))
.iterator();
while (cursor.hasNext()) {
Document doc = cursor.next();
List<Document> pings = doc.get("pings", List.class);
Integer order = pings.get(0).getEmbedded(Arrays.asList("loc","order"), Double.class).intValue();
System.out.println(order.toString()); // prints 5233423
}
NOTES:
The query with projection gets the following one sub-document from the pings array:
"pings" : [
{
"upvote" : 575,
"loc" : {
"type" : "2dsphere",
"coordinates" : [ .... ],
"transactionId" : 410527376,
"order" : 5233423
},
...
}
]
The remaining code with looping the cursor is to extract the order value from it.
The following are the imports used with the find method's filter and projection:
import static com.mongodb.client.model.Filters.*;
import static com.mongodb.client.model.Projections.*;
Was trying to change the data type of all values in a specific field, without use of iterators.
Here tid is the field name
I tried running the code in Mongo using
var ch ={"$addFields" : { "tid" : { "$convert":{"input":"$tid" , "to" : 2}}}}
db.test.aggregate(ch);
Where test is my collection
Java Code :
BasicDBObject fieldObject = new BasicDBObject();
fieldObject.put("$convert",new BasicDBObject().append("input",
"$tid").append("to", 2));
BasicDBObject addField = new BasicDBObject("$addFields",new
BasicDBObject("tid",fieldObject));
System.out.println(addField);
List<BasicDBObject> options = new ArrayList<>();
options.add(addField);
details.aggregate(options);
When I ran the code in mongo command line, the data types are changing from Integer to String.
But no change when I run the same through java code. Is there any issue with my Java Code.
I'm trying to get documents from MongoDB and map them to my object. Inserting works well. Retrieving collection also seems have everything in it. But I can't figure out why deserializing object doesn't work as intented. I'm new to Java and I could've simply forget about something, didn't understand documentation properly. But from what I've read it should work properly.
I have this code
[...]
CodecProvider pojoCodecProvider = PojoCodecProvider.builder().automatic(true).build();
CodecRegistry pojoCodecRegistry = fromRegistries(MongoClientSettings.getDefaultCodecRegistry(), fromProviders(pojoCodecProvider));
_mongoClient = MongoClients.create(mongoClientURI);
_mongoDataBase = _mongoClient.getDatabase(dbName).withCodecRegistry(pojoCodecRegistry);
[...]
And in a fuction another function I get the collection and cast it to an ArrayList:
MongoCollection<Document> collection = _mongoDataBase.getCollection(collectionName);
Document query = new Document();
List<StockTakingItem> stockItems = collection.find(query, StockTakingItem.class).into(new ArrayList<StockTakingItem>());
Though if I display the values then:
For MongoCollection collection I got this (so the document with proper values is there).
{ "_id" : "asdfasdfasdf", "Description" : "aaaaaaaaaaaaaaaa description ", "Note" : "nnnnnnnnnnnnnnnn Another note " }
But my StockTakingItem has null values in it (except for an id)
StockTakingItem:id: 'asdfasdfasdf', Description: 'null', Note: 'null
EDIT:
StockTakingItem class:
public class StockTakingItem {
#BsonId
String _id;
String _description;
String _note;
[getters and setters]
}
This code for inserting is working:
var collection = _mongoDataBase.getCollection(collectionName);
collection.insertOne(docToInsert);
Why are there null values and how can I do it properly so it works as intended?
How to Get the difference between the two date values in Mongo criteria and return value must be the difference of two date(i.e 10.01.2015 firs date and 20.01.2015 is second date) I need the value as 10 ? can any one help me how to get this in java using spring framework critieria?)
From this article What's new in Spring Data MongoDB 1.4 M1, you can use the andExpression to get the difference between the two date values:
.andExpression("endDateTime - startDateTime").as("duration")
As an example (untested):
import static org.springframework.data.mongodb.core.aggregation.Aggregation.*;
TypedAggregation<Trip> agg = newAggregation(Trip.class,
match(Criteria.where("userId").is("54e5cead3ab5c1dd97422d86")),
project("endDateTime", "startDateTime")
.andExpression("endDateTime - startDateTime").as("duration")
);
AggregationResults<DBObject> result = mongoTemplate.aggregate(agg, DBObject.class);
List<DBObject> resultList = result.getMappedResults();
In Mongo shell, you can do the following:
db.collection.aggregate( {$match:{ your-match } },
{ $group : {
_id : "$userId",
duration : { $subtract:["$endDateTime", "$startDateTime"]}},
} } );
using spring boot reactive: This will give you duration in mili seconds like 864000000
List<AggregationOperation> operations = new ArrayList<>();
operations.add(project().andExclude("_id")
.and(ArithmeticOperators.valueOf("duration")
.subtract("startDateTime"))
.as("endDateTime"));
operations.add(groupOperation);
//response
reactiveMongoTemplate.aggregate(newAggregation(operations), "collName",
Class.class);
Rather than using minus operation inside projection, I will suggest you to use ArithmaticOperation.Subtract inside projection pipeline.
ProjectionOperation projectionOperation=Aggregation.project().and(Subtract.valueOf(Date.from(Instant.now())).subtract("fieldname"));
Here is a simple pojo:
public class Description {
private String code;
private String name;
private String norwegian;
private String english;
}
And please see the following code to apply an upsert to MongoDb via spring MongoTemplate:
Query query = new Query(Criteria.where("code").is(description.getCode()));
Update update = new Update().set("name", description.getName()).set("norwegian", description.getNorwegian()).set("english", description.getEnglish());
mongoTemplate.upsert(query, update, "descriptions");
The line to generate the Update object specifies every field of the Item class manually.
But if my Item object changes then my Dao layer breaks.
So is there a way to avoid doing this, so that all fields from my Item class are applied automatically to the update?
E.g.
Update update = new Update().fromObject(item);
Note that my pojo does not extend DBObject.
I found a pretty good solution for this question
//make a new description here
Description d = new Description();
d.setCode("no");
d.setName("norwegian");
d.setNorwegian("norwegian");
d.setEnglish("english");
//build query
Query query = new Query(Criteria.where("code").is(description.getCode()));
//build update
DBObject dbDoc = new BasicDBObject();
mongoTemplate.getConverter().write(d, dbDoc); //it is the one spring use for convertions.
Update update = Update.fromDBObject(dbDoc);
//run it!
mongoTemplate.upsert(query, update, "descriptions");
Plz note that Update.fromDBObject return an update object with all fields in dbDoc. If you just want to update non-null fields, you should code a new method to exclude null fields.
For example, the front-end post a doc like below:
//make a new description here
Description d = new Description();
d.setCode("no");
d.setEnglish("norwegian");
We only need to update the field 'language':
//return Update object
public static Update fromDBObjectExcludeNullFields(DBObject object) {
Update update = new Update();
for (String key : object.keySet()) {
Object value = object.get(key);
if(value!=null){
update.set(key, value);
}
}
return update;
}
//build udpate
Update update = fromDBObjectExcludeNullFields(dbDoc);
The solution for a new spring-data-mongodb version 2.X.X.
The API has evolved, since 2.X.X version there is:
Update.fromDocument(org.bson.Document object, String... exclude)
instead of (1.X.X):
Update.fromDBObject(com.mongodb.DBObject object, String... exclude)
The full solution:
//make a new description here
Description d = new Description();
d.setCode("no");
d.setName("norwegian");
d.setNorwegian("norwegian");
d.setEnglish("english");
Query query = new Query(Criteria.where("code").is(description.getCode()));
Document doc = new Document(); // org.bson.Document
mongoTemplate.getConverter().write(item, doc);
Update update = Update.fromDocument(doc);
mongoTemplate.upsert(query, update, "descriptions");
It works!
you can use save : (if non exist = insert else = upsert)
save(Object objectToSave, String collectionName)
read : javadoc
Just like previous answers said, use mongoTemplate.getConverter().write() and Update.fromDocument() functions. But i found Update.fromDocument() won't add "$set" key and won't work directly, the solution is to add "$set" yourself, like below (PS: I'm using 2.2.1.RELEASE version):
public static Update updateFromObject(Object object, MongoTemplate mongoTemplate) {
Document doc = new Document();
mongoTemplate.getConverter().write(object, doc);
return Update.fromDocument(new Document("$set", doc));
}
If you want to upsert Pojos incl. property String id; you have to exclude the _id field in the fromDBObject method Update.fromDBObject(dbDoc,"_id").
Otherwise you get the Exception:
org.springframework.dao.DuplicateKeyException: { "serverUsed" : "127.0.0.1:27017" , "ok" : 1 , "n" : 0 , "updatedExisting" : false , "err" : "E11000 duplicate key error collection: db.description index: _id_ dup key: { : null }" , "code" : 11000}; nested exception is com.mongodb.MongoException$DuplicateKey: { "serverUsed" : "127.0.0.1:27017" , "ok" : 1 , "n" : 0 , "updatedExisting" : false , "err" : "E11000 duplicate key error collection: db.description index: _id_ dup key: { : null }" , "code" : 11000}
because the _id field of the first is null
{
"_id" : null,
...
}
Fullcode based on #PaniniGelato answer would be
public class Description(){
public String id;
...
}
Description d = new Description();
d.setCode("no");
d.setName("norwegian");
d.setNorwegian("norwegian");
d.setEnglish("english");
//build query
Query query = new Query(Criteria.where("code").is(description.getCode()));
//build update
DBObject dbDoc = new BasicDBObject();
mongoTemplate.getConverter().write(d, dbDoc); //it is the one spring use for convertions.
Update update = Update.fromDBObject(dbDoc, "_id");
//run it!
mongoTemplate.upsert(query, update, "descriptions");
Then the upsert is working in the cases of insert and update. Corrections & thoughts are welcome ;)
This is what I am doing for the time being. Not so much elegant way to do it, but it does save a precious DB call:
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.query.Query;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBObject;
import com.mongodb.util.JSON;
/**
* Perform an upsert operation to update ALL FIELDS in an object using native mongo driver's methods
* since mongoTemplate's upsert method doesn't allow it
* #param upsertQuery
* #param object
* #param collectionName
*/
private void performUpsert(Query upsertQuery, Object object, String collectionName){
ObjectMapper mapper = new ObjectMapper();
try {
String jsonStr = mapper.writeValueAsString(object);
DB db = mongoTemplate.getDb();
DBCollection collection = db.getCollection(collectionName);
DBObject query = upsertQuery.getQueryObject();
DBObject update = new BasicDBObject("$set", JSON.parse(jsonStr));
collection.update(query, update, true, false);
} catch (IOException e) {
LOGGER.error("Unable to persist the metrics in DB. Error while parsing object: {}", e);
}
}
There are two cases here that need to be distinguished:
Update an item that was previously fetched from the DB.
Update or insert (upsert) an item you created by code.
In Case 1) You can simply use mongoTemplate.save(pojo, "collection"), because your POJO will already have a filled ObjectID in its id field.
In case 2) You have to explain to mongo what "already exists" means in case of your domain model: By default the mongoTemplate.save() method updates an existing item, if there is one with that same ObjectId. But with a newly instantiated POJO you do not have that id. Therefore the mongoTemplate.upsert() method has a query parameter that you can create like this:
MyDomainClass pojo = new MyDomainClass(...);
Query query = Query.query(Criteria.where("email").is("user1#domain.com"));
DBObject dbDoc = new BasicDBObject();
mongoTemplate.getConverter().write(pojo, dbDoc); //it is the one spring use for convertions.
dbDoc.removeField("_id"); // just to be sure to not create any duplicates
Update update = Update.fromDBObject(dbDoc);
WriteResult writeResult = mongoTemplate.upsert(query, update, UserModel.class);
I ran into the same problem. In het current Spring Data MongoDB version no such thing is available. You have to update the seperate fields by hand.
However it is possible with another framework: Morphia.
This framework has a wrapper for DAO functionality: https://github.com/mongodb/morphia/wiki/DAOSupport
You can use the DAO API to do things like this:
SomePojo pojo = daoInstance.findOne("some-field", "some-value");
pojo.setAProperty("changing this property");
daoInstance.save(pojo);
I think that:
Description add a property
#Id
private String id;
then get a document by the query condition,set Description's id by document's id.
and save
Just use ReflectionDBObject - if you make Description extend it, you should just get your object's fields transferred to Update reflectively, automagically. The note from above about null fields included in the update still holds true.
public void saveOrUpdate(String json) {
try {
JSONObject jsonObject = new JSONObject(json);
DBObject update1 = new BasicDBObject("$set", JSON.parse(json));
mongoTemplate.getCollection("collectionName").update(new Query(Criteria.where("name").is(jsonObject.getString("name"))).getQueryObject(), update1, true, false);
} catch (Exception e) {
throw new GenericServiceException("Error while save/udpate. Error msg: " + e.getMessage(), e);
}
}
this is very simple way to save json string into collection using mongodb
and spring.
This method can be override to use as JSONObject.
#Override
public void updateInfo(UpdateObject algorithm) {
Document document = new Document();
mongoTemplate.getConverter().write(algorithm, document);
Update update = Update.fromDocument(document);
mongoTemplate.updateFirst(query(where("_id").is(algorithm.get_id())), update, UpdateObject.class);
}
After upsert, I was Tring to fetch same record but it was given me the old one.
But in dB I am having new records.