I am trying to convert a JSOn string into a Mongo document and there is not much help availabel online.
the only helpful thing that I found was:
1:
2:
MongoDB.Bson.BsonDocument doc4=MongoDB.Bson.Serialization
.BsonSerializer.Deserialize(genericjson);
Toggle HighlightingOpen in New WindowSelect All
as described in the post #
Convert string into MongoDB BsonDocument
It creates the document in the databse but it's not the simulation of what it is here in C#. When I click on the nodes they don't show me the data inside. this is what Mongo does when the conversion has corrupted the file.
is there any other way to solve it?
Try the BsonDocument.Parse() method, e.g.
var bsonDoc = BsonDocument.Parse(jsonString);
Related
I have a variable named "value" that are connected to a remote database and has the value of a xml string. Im wondering how I can take the values from that xml string and display them in my mvc index.cshtml. Do you need to do a model class that repressents the values in the xml string? I need help knowing what to search for, any help will do alot
thx in advance and I hope you understand my concern.
You're question is a little vague but I will try my best to answer it. You can use this to load an XElement from and XML file and then convert that to JSON and then convert to an object.
XElement xml = XElement.Load(path);
var json = JsonConvert.SerializeXNode(xml, Newtonsoft.Json.Formatting.Indented, omitRootObject: true);
Console.WriteLine(json);
File.Delete(path);
var wbexport = JsonConvert.DeserializeObject<WbExport<Column>>(json);
If you are trying to load a string value from a field in a database then you should look at an ORM solution like Dapper or Entity Framework
Dapper:
using(var sql = new SqlConnection(_configuration.GetConnectionString("ConnectionString")))
{
await sql.OpenAsync();
var val = await sql.QueryAsync("<query to get your xml value>");
}
I just want to remove one record in table "Meta" for example PasswordInfo
I tried this code:
var data = _mednoteDb.GetCollection(Users).FindOne(...);//specific record
data.Remove("PasswordInfo");
but it didin't work.
Code
I am not a mongodb superexpert, but depending on the format of your data you might want to be using one or another of the mongodb operator functions.
$pull is the operator for deleting element from an array property of a document, documentation here.
$unset is the operator for deleting subdocument from a document, documentation here.
There are a bunch of examples already on stackoverflow, if you don't find what you are search looking for, I can point you in some specific directions.
I have follwoing setup.
Application sends serialized JSON data into Firehose.
Firehose is configured with Data conversion to praquet using a glue table definition for efficient query execution.
I am able to run query in Athena and see the results.
Now what I need is to create another application which can query Athena using AWSSDK (C#) and read the data back in JSON format.
Is it possible to somehow use the table's input/output format and serde to read the data back in JSON format using Athena SDK? Or I need to implement custom logic to convert the data back to JSON?
Question is old, but might help someone who trying to export results from Athena table into different output format. AWS CTAS can be used to export data into different formats (ORC, PARQUET, AVRO, JSON, or TEXTFILE) using simple Athena CTAS (https://docs.aws.amazon.com/athena/latest/ug/create-table-as.html) statement. You can also specify compression format for saving output data.
Below example would export data into JSON format on s3.
output_location='s3://s3_bucket/output.json'
CREATE TABLE output
WITH (
format = 'JSON',
external_location = output_location) AS SELECT * FROM target_table
Downside of this approach : Output is always compressed.
Athena bases on Presto version 0.172, so you will find the answer in Presto documentation.For instance, this chapter can be useful to you:
https://prestodb.io/docs/current/functions/json.html
So I get something like this from Athena:
SELECT output FROM "test"."prod" limit 10;
{score=41, avg_time_solving={double=17439.333333333332, long=null}
If I use cast for this field I get:
SELECT CAST(output AS JSON) FROM "test"."prod" limit 10;
[51, [8205.57142857143,null], [null,5159], 7, [0.8571428571428571,null], null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null]
I want to replace a stock price data AccessDB with a MongoDB using MongoDB c# driver.
The download data using xmlhttprequest as json string is shown below (2 dates only):
[{"date":"2016-01-04T00:00:00.000Z","close":2.77,"high":2.82,"low":2.63,"open":2.77,"volume":32516771},{"date":"2016-01-05T00:00:00.000Z","close":2.75,"high":2.8,"low":2.64,"open":2.77,"volume":12972260},....]
I have studied the c# driver documentation and conducted web searches, but can't find anything that I can get to work. I could parse the each document (i.e, price for a symbol and a date) in the json string and insertOne as in the BsonDocument snippet below.
I would think that json or BSON methods exist that make to appropriate conversions to accomplish a BSON insertMany() DB load.
Please help me get up the curve by finding appropriate info and learn how to do this.
Thank you.
The below works with manual conversion from above JSON data for 1 date
BsonDocument stkDoc = new BsonDocument
{
{"symbol","AMD"},
{"date","2016-01-04T00:00:00.000Z"},
{"close",2.77},
{"high",2.82},
{"low",2.63},
{"open",2.77},
{"volume",32516771}
};
_client = new MongoClient();
_db = _client.GetDatabase("stkprices");
var collection = _db.GetCollection("stkdata1");
collection.InsertOne(stkDoc);
I am writing a C# application that reads from an XML file, converts that to JSON, and uploads to MongoDB. Some of our tags are structured with a period at the end, like so:
<BatteryTest.>GOOD</BatteryTest.>
Using the Newtonsoft library I am able to convert the XML to JSON without a problem. It is when I go to deserialize it to a BsonDocument that I have trouble:
var document = MongoDB.Bson.Serialization.BsonSerializer.Deserialize<BsonDocument>(jsonText);
I get the following error message:
An exception of type 'MongoDB.Bson.BsonSerializationException' occurred in mscorlib.dll but was not handled in user code
Additional information: Element name 'BatteryTest.' is not valid'.
I have looked at the documentation but I haven't found anything that would explain how I can change the formatting properties of the deserializer. This is valid XML so I am not sure why the deserializer would choke on it, either.
Is this invalid JSON? If so, is there a way to still insert it into MongoDB without dropping that period?
As the the dot can be used in MongoDB queries, it can not be used in field names. You will have to preprocess the JSON before converting it into a BSONDocument.