How to make the time stamp difference for inserting and updating record in mongo? - mongodb

Question

I need to create a time stamp in my mongodb collection. Am using C# in front end .My code is :
internal static void CreateStudent(string Id, string Name,string strUserId)
{
MongoServer server = MongoServer.Create(ConnectionString);
MongoDatabase mydb = server.GetDatabase("Database");
MongoCollection<BsonDocument> Student = mydb.GetCollection<BsonDocument>("Student");
BsonDocument colectionGenre = new BsonDocument {
{ "Code", Id }, //Id is Auto Generated in sql. Fetch from there using Output parameter and save it in one variable and pass that here
{ "Name", Name },
{ "Status","Y"},
{"stamps" , new BsonDocument {
{"Ins_date", DateTime.Now},
{"up_date",""},
{"createUsr", strUserId},
{"updUsr", ""},
{"Ins_Ip", GetIP()},
{"Upd_IP",""}}}
};
Student.Insert(colectionGenre);
}
internal static void UpdateStudent(string Id, string Name,string strUserId)
{
MongoServer server = MongoServer.Create(ConnectionString);
MongoDatabase mydb = server.GetDatabase("Database");
MongoCollection<BsonDocument>Student = mydb.GetCollection<BsonDocument>("Student"); ;
// Query for fetch the ID which is edited by the User...(user can only able to edit the NAME field alone)
var query = new QueryDocument {
{ "Code", Id }};
// After Fetch the correspondent ID it updates the name with the Edited one
var update = new UpdateDocument {
{ "$set", new BsonDocument("Name", Name) }
};
// Updated Query.(Id is same as previous. Name is updated with new one)
{"stamps" , new BsonDocument {
{"up_date",DateTime.Now},
{"updUsr", strUserId},
{"Upd_IP",GetIp()}}}
}}
};
Student.Update(query,update,UpdateFlags.Upsert, SafeMode.True);
}
It works fine for INSERT method with time(Stamp) once the record is created. But the problem is with update method. When user update something the insert time also changed with the updated time..
After User Updates the Name, i want my will collection looks like this
{
"_id" : ObjectId("5178aea4e6d8e401e8e51dc0"),
"Code": 12,
"Name": Sname,
"Stamps:"{
"Ins_date":03:34:00,
"up_date": 04:35:12
}
}
But my problem is both the time will same after update. That is because it takes the current date and time function..How can i achieve the above output.It needs any driver.Suggest something for me...

Answer 1

You're passing in a value for the Ins_date field when you're updating the document. Just remove that from the update document and it won't change it.
var update = new UpdateDocument {
{"$set", new BsonDocument {
{"State_strName", name},
{"stamps" , new BsonDocument {
{"up_date",DateTime.Now},
{"createUsr", ""},
{"updUsr", ""},
{"Ins_Ip", GetIP()},
{"Upd_IP",GetIP()}}}
};
tblmytbl.Update(query, update);

Answer 2

How you are updating the value in the existing document by using unique id or other unique value.Check whether the unique id or value is already exist in your database documents.If it is exist means change the update time only don't do anything..

Answer 3

While updating the data in mongoDB,you are passing the same values for Ins_date and up_date i.e. DateTime.Now(current system date and time).So the same values are updating in your monoDB document.
For this you can do one thing :-
Before updating your mongoDB document you take Ins_date values from your database by using sql query in C#.net and then use this value for Ins_date and for up_date use DateTime.Now then your both values will be different.
var update = new UpdateDocument {
{"$set", new BsonDocument {
{"State_strName", name},
{"stamps" , new BsonDocument {
{"Ins_date", **Ins_date values_from your database**} ,
{"up_date",DateTime.Now},
{"createUsr", ""},
{"updUsr", ""},
{"Ins_Ip", GetIP()},
{"Upd_IP",GetIP()}}}
};
tblmytbl.Update(query, update);

Answer 4

Sounds like what you need is the new $setOnInsert operator which was added in 2.4 for exactly this use case.
When the update with upsert flag results in an insert, you want to $set insert_date to Date.now but when it's a regular update, you don't want to set it at all. So now with your update you should use $set for regular fields you want to set whether it's an update or an insert, but use $setOnInsert for fields that should only be set during insert.

Answer 5

Finally I got answer...In INSERT method Simply pass the below things
{"Insert-stamps" , new BsonDocument {
{"Ins_date", DateTime.Now},
{"createUsr", strUserId},
{"Ins_Ip", GetIP()}}},
{"Update-stamps" , new BsonDocument {
{"up_date",""},
{"updUsr", ""},
{"Upd_IP",""}}}
And In UPDATE method
{"Update-stamps" , new BsonDocument {
{"up_date", DateTime.Now},
{"updUsr", StrUserId},
{"Upd_IP",GetIP()}}}
It works Fine for my standard....