I'm just getting started with mongoDB, and coming from a MySQL environment I'm having trouble figuring out how have my documents automatically have fields such as UPDATED, CREATED, DELETED
So when I create an entry like this:
{
"email": "some#test.com",
"name": "bob"
}
I would like it to automatically become this:
{
"email": "some#test.com",
"name": "bob",
"CREATED": 1567120458,
"UPDATED": 1567120458,
"DELETED": null
}
I have found https://docs.mongodb.com/manual/reference/operator/update/currentDate/ this resource which talks about a way of inserting dates, but I am not sure how to use this, or where to place this.
{ $currentDate: { <field1>: <typeSpecification1>, ... } }
I don't know what this piece of code means or where to use it.
I've installed Stuido 3T to help me manage the database, but I don't see any option to use this piece of code.
Construct your query use Date:
db.example.insert({"date":new Date(Date.now())})
Related
I have exported one of my collections from MongoDB and it looks like the following:
[
{
"_class": "test.Tag",
"title": "My Title",
"_id": {
"$oid": "637a2bc4a9c297b306dd0be9"
}
}
]
Now, I want to add another item to this collection.
I have created a json file exactly in the same format.
However, when I use the following command:
db.tag.insertMany([{"_class": "test.Tag", "title": "New Title","_id": {"$oid": "637a4171833047f9e046f3c9"}}])
I get the error:
MongoBulkWriteError: _id fields may not contain '$'-prefixed fields: $oid is not valid for storage.
I found a couple of similar questions on stackoverflow, e.g. this one, but they didn't help me.
How should I insert something in my database?
When I use MongoDB Compass, there is no problem. It works. But when I try it on my real database on the server, it doesn't work.
If it helps, I am using Mongo version 6.0.1.
Your help would be appreciated.
In the legacy mongo shell there is no helper for extended json format , but in mongosh you can use EJSON to deserialize the extended json and insert it as follow:
> db.test4.insertMany([EJSON.deserialize( {"_id": { "$oid": "637aa8243d58f36141e59c8d"} } )])
{
acknowledged: true,
insertedIds: { '0': new ObjectId("637aa8243d58f36141e59c8d") }
}
>
( The legacy mongo shell was deprecated in MongoDB 5.0 and removed in MongoDB 6.0 )
how to write liquibase migration script for mongodb, which has an array of creditCards and I want to put something like "status" as "inactive" for an employee whose creditCard missing field "status". below is the collections
{
"empId":1,
"availablePaymentModes":{
"passportNumber":"XYZ",
"creditCards":[
{
"bankName":"AA1",
"cardNumber":"1234",
"status": "active"
},
{
"bankName":"AA2",
"cardNumber":"1234"
},
{
"bankName":"AA4",
"cardNumber":"1234",
"status": "active"
}
]
}
}
{
"empId":2,
"availablePaymentModes":{
"passportNumber":"XY1",
"creditCards":[
{
"bankName":"AA1",
"cardNumber":"2234",
"status": "active"
},
{
"bankName":"AA2",
"cardNumber":"2234"
}
]
}
}
Please check out the documentation on how to write changelogs with changesets for liquibase. This is how a migration script gets written in Liquibase.
If it is easier, you can write you changelog in sql.
I would also recommend you take the liquibase fundamentals class b/c this question is easily answerable after spending a few hours to complete this course and you walk away with a certification.
So as long as you can take your collection from above and define it in sql, you should be able to put that in a changelog.sql, and point the url value in the liquibase.properties file to that changelog.sql and then run a liquibase update.
Can anyone tell me why when I use DataExplorer for CosmoDb DB I get the following:
{
"id": "d502b51a-e70a-40f1-9285-3861880b8d90",
"Version": 1,
...
}
But when I use Robomongo I get:
{
"Version" : 1,
...
}
minus the id?
Thanks
I tried to repro your scenario but it all worked correctly.
The Mongo document in Portal Data Explorer:
The Mongo document in Robo 3T:
They both have the id property.
Are you applying Projections on Robomongo / Robo 3T?
At this moment cosmodb works separately SQL API and Mongo API, each one has different implementation, SQL API use JSON and Mongo use BSON, you need to be clear this while you are creating the document.
If you create the document with a BSON-based tool like Robo3t for example, you are going to get something like this:
{
"_id": {
"$oid": "5be0d98b9cdcce3c6ce0f6b8"
},
"name": "Name",
"id": "5be0d98b9cdcce3c6ce0f6b8",
...
}
Instead, if you create your document with JSON-based like Data Explorer, you are going to get this:
{
"name": "Name",
"id": "6c5c05b4-dfce-32a5-0779-e30821e6c510",
...
}
As you can see, BSON-based needs that _id and inside $oid be implemented to works right, while JSON-based only id is required. So, you need to add the properties while you save the document (see below) or open it with the right tool, as Matias Quaranta recommend, use Azure Storage Explorer or even Data Explorer to get both protocols properly.
Also, if you use a system to create the document and you want to use BSON format, You need to add the $oid, for example in core net is something like this:
public bool TryGetMemberSerializationInfo(string memberName, out BsonSerializationInfo serializationInfo)
{
switch (memberName)
{
case "Id":
serializationInfo = new BsonSerializationInfo("_id", new ObjectIdSerializer(), typeof(ObjectId));
return true;
case "Name":
serializationInfo = new BsonSerializationInfo("name", new StringSerializer(), typeof(string));
return true;
default:
serializationInfo = null;
return false;
}
}
In mongodb i saved document like this.
"Angela_Merkel": {
"birthPlace": "Hamburg,West_Germany",
"thumbnail": "http://commons.wikimedia.org/wiki/Special:FilePath/Angela-Merkel-2014.jpg?width=300",
"almaMater": "Leipzig_University",
"birthDate": "1954-07-17",
"spouse": "Joachim_Sauer"
}
There are many person's information like this way. Now if I want to get all the information of "Angela_Merkel" or only a particular like "birthdDate" of "Angela_Merkel" then what will be the query?
Like chridam says would be more practical that you refactor your documents like this:
{"name": "Angela_Merkel",
"birthPlace": "Hamburg,West_Germany",
"thumbnail": "http://commons.wikimedia.org/wiki/Special:FilePath/Angela-Merkel-2014.jpg?width=300",
"almaMater": "Leipzig_University",
"birthDate": "1954-07-17",
"spouse": "Joachim_Sauer"
}
Inside the "people" collection (Its a convention name the collections as plurals, beeing a set of documents)
Then you could do:
db.people.find({"name":"Angela Merkel"},{"_id":0," "birthdDate":1 })
To get:
{"birthDate": "1954-07-17"}
Anyway you can get with your document what you want this way:
"birthDate":
db.person.find({"Angela_Merkel.birthDate": "1954-07-17"})
or all the info:
db.person.find({"Angela_Merkel": { $exists: true}})
But doesn't have much sense do it this way.
PD: Edited to include last part.
I am new to Cloudant and I need to do a simple query on a specific document field. My documents have the following structure and I need to get only the documents with status=SIGNED
{
"_id": "3ddb4058f3b24a7a9c585f997e30ff78",
"_rev": "3-757c82c48f4e7c333911be6859aff74e",
"fileName": "Generali Architects",
"status": "SIGNED",
"user": "italy",
"_attachments": {
"Generali Architects": {
"content_type": "application/pdf",
"revpos": 3,
"digest": "md5-9hqSif7CzQ2yvKxSSbj+dw==",
"length": 323653,
"stub": true
}
}
}
Reading Cloudant documentation I created the following Design Document with a related view which returns exactly what I expected
Then from my Java application I use the following code
String cloudantView = "_design/signedDocs/status-signed-iew";
List<SignDocDocument> docs =
db.view(cloudantView).includeDocs(true).query(SignDocDocument.class);
which always returns me "org.lightcouch.NoDocumentException: Object Not Found"
Any idea which kind of mistake I am making here?
Thank you very much
Is it the typo in "_design/signedDocs/status-signed-iew"; e.g. that should be "_design/signedDocs/status-signed-view"; (depending on how your java library works...).
Always worth checking the view by direct access in your browser, too, just to make sure it's returning the expected data.