Created question in FIWARE Q/A platform on 22-06-2015 at 10:06
Please, ANSWER this question AT https://stackoverflow.com/questions/30974926/check-if-entity-already-exists-in-a-contextbroker

Question:
Check if Entity already exists in a ContextBroker

Description:
Recently i've been working on an application which allow the users to query enities from a ContextBroker , Cosmos and so on . One feature of the application is to initialize an entity which will be used by a connected object to store data .

The creation works fine , but I have a little problem .

As said in the documentation for the Orion ContextBroker , when an Entity already exists the APPEND action is interpreted as a UPDATE (I sincerely don't understand why) . So here's a scenario , the user have a Entity called Room1 , the sensors give him his data and stores it . One day , he want to create a new entity , but make an error and call it Room1 . All the current data from Room1 will be reset to the default value I put in my application .

Here is my question , is there a way to check if the entity already exist other than doing a manual query (which will take a much longer time to process) in the application before the creation ?

Thank you for reading my question and have a good day .

Guillaume Jourdain .