Criterion

In our previous post we saw the Criteria API at its simplest. No select clauses or where clauses. Just the from clause. However without the ability to apply conditions, Criteria as a feature would be of very limited use.

Criteria API - the basics

Until now I have used HQL in all the posts we have seen. I decided to go ahead and try the Criteria API. With criteria you create your queries programmatically and not via Strings. In the HQL examples the simplest Query was the select * query.

HQL and Nested Queries

It is often the case that we need to execute a query based on the results of another query. One way would be to execute the first query, get the results, parse and use them for the second query. The concern here is that since we are not concerned with results of the first query why should we have the application handle that logic ? Instead why not have the database process the two queries together and return to the application only the results of the second query. The results that the application is actually interested in. This can be achieved using inner queries or sub queries.

SOAP Webservices using Spring -3

As of now we have configured the web service and have also made our contract (or WSDL ) visible to the client. But what happens when the client actually sends a request? How do we handle it?

SOAP Webservices using Spring -2

In the previous example we saw how to set up the application and add the WSDL and XSD files needed. We also configured a MessageDispatcherServlet to handle the operations exposed by our web-service.