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This is called transaction-scoped identity, and there is no need to synchronize two objects that have only the database identity in common In other words, all operations in concurrently running transactions are isolated from each other So how do you solve this concurrent access to the same resource Hibernate uses existing mechanisms present in any database-management system to resolve the conflict The Hibernate Session inherits the transaction semantics and transaction isolation level of the standard JDBC connection it s started with This means you ll experience the typical problems of not having fully isolated access to a shared resource (dirty reads, nonrepeatable reads, phantom reads), depending on the transaction isolation level of your database connection and transaction Conflicting updates, however, are resolved with an optimistic approach at commit time (using a version check).

Note You cannot create complex constraint logic, such as nested constraints. The portal will allow you to add

With Hibernate s automatic versioning, you can ensure that an object loaded and modified in Session A can t overwrite the changes made to an object in Session B if the database transaction of Session B (manipulating the same object) was committed earlier than Session A s In rare cases, and when handling critical data, you may use a pessimistic approach By setting a pessimistic exclusive lock (using a LockMode) in.

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How It Works Just as in the previous example, the proxy class and .NET infrastructure takes care of passing the information to the remote web method and handing results back. In this case, you receive a complex DataSet object back, which can be readily used to fill your DataGrid control. You take advantage of data binding, as discussed in 5. Having both the consumer application and the web service inside the Friends Reunion project makes it extremely easy to follow the execution flow. If you place breakpoints in your web methods code before starting the Acudei consumer site project, you can step into the code easily. Note that we don t handle errors that could happen, such as connectivity problems, service malfunctioning, and so on. We will introduce some error handling that is particular to web services in the Error Handling in Web Services section later in this chapter. General debugging and exception-handling techniques are covered in 11.

constraints only with simple and/or relationships. By adding more than one constraint, an additional drop-down list will appear that will allow you to define the constraint relationship.

the database, you prevent Session B from loading the same object; it must wait (or immediately fail) until Session A releases the lock. The question sometimes also refers to an automatic update of a loaded object if it has been modified while it s loaded. For example, if Session B displays an object to the user and Session A modifies that object, the display in Session B must be updated. Hibernate has no automatic push mechanism; therefore, the application has to poll the database for updates. This is consistent with the transaction semantics of Hibernate and the database. You may in rare cases implement a Hibernate Interceptor and trigger a refresh() call in all other units of work if an object has been modified, but doing so will always require synchronized access that might become a bottleneck for scalability.

Although there s no need for us to go deep into the gory details (as .NET takes care of it all for us), it s useful to know where SOAP comes in to all of this, as it plays a fundamental behind-thescenes role in web services. SOAP is a means of sending a message to an endpoint (URL), and it offers an alternative to the HTTP-POST options that we ve already discussed. It is used in .NET as the default method for accessing web services. This is due to the richer functionality that it offers, namely a more structured way of alerting the calling application to errors (which we ll cover shortly), support for return parameters (reference parameters), and other such features.

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