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A reduction in costs Because the Internet is used to connect to the private network, there is considerable savings from not having to make long-distance phone calls, purchase modems and additional hardware, and bear all of the costs associ ated with a dial-up networking solution. Authentication and encryption capabilities Authentication prevents unau thorized users from connecting to the company s private network. Strong encryption methods, such as 3-DES (data encryption standard), make it difficult for an unautho rized user to interpret the data sent across a VPN connection if captured with a network analyzer or sniffer.

LockMode.UPDGRADE_NOWAIT The same as UPGRADE, but use a SELECT ... FOR UPDATE NOWAIT, if supported. This disables waiting for concurrent lock

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In a VPN, clients use tunneling protocols to connect to the VPN server. The advantage to such a technology is that the Internet can be used to send the data. However, since the Internet is a public network, tunneling protocols must be implemented to protect the data from being intercepted along the way. Data in a VPN is encrypted, so even if the data were intercepted as it traversed the Internet, the would-be attacker would also need to decrypt the data to make use of it.

releases, thus throwing a locking exception immediately if the lock can t be obtained. This mode transparently falls back to LockMode.UPGRADE if the database SQL dialect doesn t support the NOWAIT option.

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Error Handling Executing Stored Procedures Module Execution Context Cursors Compilation and Recompilation Lesson Summary

10-12

LockMode.FORCE Force an increment of the objects version in the database, to indicate that it has been modified by the current transaction. Equivalent to LockModeType.WRITE in Java Persistence. LockMode.WRITE Obtained automatically when Hibernate has written to a row in the current transaction. (This is an internal mode; you may not specify it in your application.)

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10

By default, load() and get() use LockMode.NONE. A LockMode.READ is most useful with session.lock() and a detached object. Here s an example:

Lesson 2: User-Defined Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167 System Functions User-Defined Functions Retrieving Data from a Function Lesson Summary 167 168 170 174

Item item = ... ; Bid bid = new Bid(); item.addBid(bid); ... Transaction tx = session.beginTransaction(); session.lock(item, LockMode.READ); tx.commit();

A VPN emulates a private point-to-point link between two computers that are actually communicating over a public network. Data from each of the computers is encapsu lated with a header that contains the necessary routing information, enabling the data to traverse the public network to reach its destination. Since this data is also encrypted, it cannot be easily interpreted if unauthorized personnel intercept it. This private link, which contains the encapsulated and encrypted data, is called a VPN tunnel. See Figure 10-3.

Lesson 3: Triggers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175 DML Triggers DDL Triggers Logon Triggers Lesson Summary 175 176 178 182

This code performs a version check on the detached Item instance to verify that the database row wasn t updated by another transaction since it was retrieved, before saving the new Bid by cascade (assuming the association from Item to Bid has cascading enabled). (Note that EntityManager.lock() doesn t reattach the given entity instance it only works on instances that are already in managed persistent state.) Hibernate LockMode.FORCE and LockModeType.WRITE in Java Persistence have a different purpose. You use them to force a version update if by default no version would be incremented. Forcing a version increment If optimistic locking is enabled through versioning, Hibernate increments the version of a modified entity instance automatically. However, sometimes you want to increment the version of an entity instance manually, because Hibernate doesn t consider your changes to be a modification that should trigger a version increment. Imagine that you modify the owner name of a CreditCard:

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