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The most common HibernateException is a generic error. You have to either check the exception message or find out more about the cause by calling getCause() on the exception. A JDBCException is any exception thrown by Hibernate s internal JDBC layer. This kind of exception is always caused by a particular SQL statement, and you can get the offending statement with getSQL(). The internal exception thrown by the JDBC connection (the JDBC driver, actually) is available with getSQLException() or getCause(), and the database- and vendor-specific error code is available with getErrorCode(). Hibernate includes subtypes of JDBCException and an internal converter that tries to translate the vendor-specific error code thrown by the database driver into something more meaningful. The built-in converter can produce JDBCConnectionException, SQLGrammarException, LockAquisitionException, DataException, and ConstraintViolationException for the most important database dialects supported by Hibernate. You can either manipulate or enhance the dialect for your database, or plug in a SQLExceptionConverterFactory to customize this conversion. Other RuntimeExceptions thrown by Hibernate should also abort a transaction. You should always make sure you catch RuntimeException, no matter what you plan to do with any fine-grained exception-handling strategy.

In general, operations that produce side effects, such as DML statements or transaction operations, are disallowed from user-defined functions, including table-valued functions. These operations might be desired, however. For example, one might wish to set a SAVEPOINT transaction, perform some operation, and roll back to the SAVEPOINT in case an error occurs.

You now know what exceptions you should catch and when to expect them. However, one question is probably on your mind: What should you do after you ve caught an exception All exceptions thrown by Hibernate are fatal. This means you have to roll back the database transaction and close the current Session. You aren t allowed to continue working with a Session that threw an exception.

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The description of results produced by a CLR-stored procedure through SqlPipe differs from that of a CLR TVF and is consistent with results in T-SQL. A TVF is strongly typed, and as part of the registration (CREATE FUNCTION) statement, it must statically define the type of its return value.

Usually, you also have to exit the application after you close the Session following an exception, although there are some exceptions (for example, StaleObjectStateException) that naturally lead to a new attempt (possibly after interacting with the application user again) in a new Session. Because these are closely related to conversations and concurrency control, we ll cover them later.

3. A user reports that during a logon attempt, a message indicates that the computer cannot contact the domain because the domain controller is down or the com puter account may be missing. You open Active Directory Users and Computers and that computer s account appears normal. What steps should you take

Can I use exceptions for validation Some developers get excited once they see how many fine-grained exception types Hibernate can throw. This can lead you down the wrong path. For example, you may be tempted to catch the ConstraintViolationException for validation purposes. If a particular operation throws this exception, why not display a (customized depending on the error code and text) failure message to application users and let them correct the mistake This strategy has two significant disadvantages. First, throwing unchecked values against the database to see what sticks isn t the right strategy for a scalable application. You want to implement at least some data-integrity validation in the application layer. Second, all exceptions are fatal for your current unit of work. However, this isn t how application users will interpret a validation error they expect to still be inside a unit of work. Coding around this mismatch is awkward and difficult. Our recommendation is that you use the fine-grained exception types to display better looking (fatal) error messages. Doing so helps you during development (no fatal exceptions should occur in production, ideally) and also helps any customer-support engineer who has to decide quickly if it s an application error (constraint violated, wrong SQL executed) or if the database system is under load (locks couldn t be acquired).

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