[Backlogmanager] [FIWARE-JIRA] (HELP-9320) [fiware-stackoverflow] Check if Entity already exists in a ContextBroker

[Fernando Lopez (JIRA)]

     [ https://jira.fiware.org/browse/HELP-9320?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Fernando Lopez reassigned HELP-9320:
------------------------------------

    Assignee: Fermín Galán

> [fiware-stackoverflow] Check if Entity already exists in a ContextBroker
> ------------------------------------------------------------------------
>
>                 Key: HELP-9320
>                 URL: https://jira.fiware.org/browse/HELP-9320
>             Project: Help-Desk
>          Issue Type: Monitor
>          Components: FIWARE-TECH-HELP
>            Reporter: Backlog Manager
>            Assignee: Fermín Galán
>              Labels: fiware, fiware-orion
>
> Created question in FIWARE Q/A platform on 22-06-2015 at 10:06
> {color: red}Please, ANSWER this question AT{color} 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 . 



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