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Ashok CM
Ashok CM

Reputation: 56

Hibernate Queries in GWT

I wanted to fire HQL queries from GWT client. But As it comes asynchronously, If I want to fire a sequence of queries, How do I do that?

Asynchronously all the data is transferred to client and used. But If I want to fire the queries in sequence how do I do that?

Mainly, the order of processing those HQL results should not be changed.

Let me know if you have any queries. Thanks in advance.

Upvotes: 0

Views: 158

Answers (3)

Rafa de Castro
Rafa de Castro

Reputation: 2524

GWT is asynchronous so you have to build everything based on request->callback

You can do two things in a case like this:

  • Have only a single RPC service that gathers the results for all queries and returns them. Remember that the services are plain java servlets
  • Have many RPC services that do one query each. Make the query to the first and in the callback you can display (or gather) whatever result and invoke the second query and in its callback do the same procedure... and so on.

Upvotes: 0

Johanna
Johanna

Reputation: 5293

Using Hibernate with GWT is not as simple as you may think. Google has a good documentation for the use of Hibernate. Did you already read that documentation?

I can recommend the use of Gilead. I'm not sure if this would solve your problem because I'm not exactly sure what your problem is.

Upvotes: 0

Shehzad
Shehzad

Reputation: 2940

GWT Client will fire your queries in the order you have defined in client file i.e

yourClient.java

Query q1; //execute method  first request
Query q2; // execute method second request

The Queries will run on sequence first q1 then q2 but q2 will not wait for the completion of q1. Once request send you can not assure about the order inwhich you will get response it might be possible that q2 will execute and return the response first while q1 is in progress.

Mostly operations for making sequence from client side is bit expensive. i.e you can use the queries on success method of AsyncCallback. When response of q1 will comes then q2 will be executed but if you have several queries then its an expensive solution.

So best thing is that make a Service method execute your all queries at server side and return map of result then populate it in your client side in any sequence you want to show the data.

Upvotes: 1

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