Tag Archives: BSON

Compound Indexes MongoDB Java Example

Compound Indexes MongoDB Java Example

Having a requirement on searchingIndexing in MongoDB multiple keys in a query or need the result in the sorted order on the basis of multiple keys this is where Compound Indexes come into the picture. If we look at our previous post example – Simple Index MongoDB Java Example,where we have created index on key username such that whenever we performs a query on userName key it always gives us the record in the optimal time and in sorted order of username. Now if I want my result to be in ascending order of age and descending order of username then in that case it won’t be optimized as results are not stored in the ascending order of age because we don’t have any index on age key. Continue reading Compound Indexes MongoDB Java Example

Share and Enjoy

  • Facebook
  • Twitter
  • Delicious
  • LinkedIn
  • StumbleUpon
  • Add to favorites
  • Email
  • RSS

Types of Write Concern in MongoDB – Performance Vs Persistence

[This post will discuss about different types of write concern in MongoDB – Performance Vs Persistence.]
Controlling the write MongoDB Official Logooperations in an application is always an important aspect. Today almost all the frameworks that interact with datastores provide mechanism to let you know whether your write operation is successful or not. Now when we talk about in the context of MongoDB , it also provides you an ability called as Continue reading Types of Write Concern in MongoDB – Performance Vs Persistence

Share and Enjoy

  • Facebook
  • Twitter
  • Delicious
  • LinkedIn
  • StumbleUpon
  • Add to favorites
  • Email
  • RSS

Upsert MongoDB Java Example

This post will talk about upsert mongodb java example.
Consider a scenario where we have to MongoDB Official Logo
write the logic such that – we will
search for a record in the database
and if it is available in database we
will update it else we will insert a
new record with same information.
Conventional solution for this type of problem is first you will try to find the record in MongoDB either using findOne() or find() , and on Continue reading Upsert MongoDB Java Example

Share and Enjoy

  • Facebook
  • Twitter
  • Delicious
  • LinkedIn
  • StumbleUpon
  • Add to favorites
  • Email
  • RSS

Can’t serialize class – MongoDB Illegal Argument Exception

While working on the array modifiers example MongoDb
, I was trying to use the $sort
modifier with $each and $push modifier
.In that example I added
an array of books to my original
document and was trying to sort it on the basis of one of the fields.As soon as I executed that method,i got our infamous IllegalArgumentException : Exception in thread “main” java.lang.IllegalArgumentException: can’t serialize class com.lotusmedia.mongo.models.Book (Can’t serialize class – MongoDB). Continue reading Can’t serialize class – MongoDB Illegal Argument Exception

Binary JSON (BSON)

To understand BSON we have to go back to JSON to understand why it was designed and that is to provide a light weight medium for transferring the data over the wire that can be serialized and deserialized very fast. BSON took this thing one step ahead.

Binary JSON or BSON is the binary version of JSON i.e javascript object notation.In simple terms we can also say that it is an extension over the conventional JSON.It supports all the features that are available in JSON that means anything that can be represented or processed in JSON can be done in BSON also,in addition to that BSON also provides some extra advantage over JSON.
BSON Specs can be seen here. Continue reading Binary JSON (BSON)

Share and Enjoy

  • Facebook
  • Twitter
  • Delicious
  • LinkedIn
  • StumbleUpon
  • Add to favorites
  • Email
  • RSS