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How does Hibernate know that saveOrUpdate() requires an INSERT and not an UPDATE It doesn t, so a trick is needed: Hibernate queries the USERS table for the given username, and if it s found, Hibernate updates the row. If it isn t found, insertion of a new row is required and done. This is certainly not the best solution, because it triggers an additional hit on the database. Several strategies avoid the SELECT:

/* Abort the above query and execute the following insert statement. */ INSERT Test.TestTran (Col1, Col2) VALUES (1, 3);

Add a <version> or a <timestamp> mapping, and a property, to your entity. Hibernate manages both values internally for optimistic concurrency control (discussed later in the book). As a side effect, an empty timestamp or a 0 or NULL version indicates that an instance is new and has to be inserted, not updated. Implement a Hibernate Interceptor, and hook it into your Session. This extension interface allows you to implement the method isTransient() with any custom procedure you may need to distinguish old and new objects.

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The vast majority of servers used on local area networks perform either the function of print serving or hosting file shares. For an administrator it is vitally important that these servers function efficiently and reliably. Administrators of file servers need to ensure that the volume hosting the file share does not fill with data. This can happen if old data is kept around long after it has served its use and new data is being written every day. Administrators also need to make sure that individual users do not store a disproportionate amount of data on the server com pared to their colleagues. One way of ensuring that a volume does not fill up and that all users have limits placed on their ability to store data is to institute quotas on the par tition. A quota blocks a user from using more than an allocated amount of disk space. The Quota tab can be accessed by editing the properties of an individual volume. Print queues can be monitored on the server or remotely. They can also be monitored through the Performance console. The Performance console is able to be used to gen erate an at-a-glance report of the current number of print jobs assigned to any one particular print server. This will allow an administrator to decide if the printing load should be shared among other servers if things seem to be taking an inordinate amount of time.

On the other hand, if you re happy to use save() and update() explicitly instead of saveOrUpdate(), Hibernate doesn t have to distinguish between transient and detached instances you do this by selecting the right method to call. (This issue is, in practice, the only reason to not use saveOrUpdate() all the time, by the way.) Mapping natural primary keys with JPA annotations is straightforward:

SELECT * FROM Test.TestTran WHERE Col1 = 1; /* Now returns 3 rows. The rows with the values 1 & 2 for the column Col2 are unchanged. But the row with Col2 = 3 is now included in the result. That row is a phantom read! */ COMMIT TRAN; -- Drop the table used in this example. DROP TABLE Test.TestTran;

@Id private String username;

6

If no identifier generator is declared, Hibernate assumes that it has to apply the regular select-to-determine-state-unless-versioned strategy and expects the application to take care of the primary key value assignment. You can again avoid the SELECT by extending your application with an interceptor or by adding a versioncontrol property (version number or timestamp). Composite natural keys extend on the same ideas.

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Mapping a composite natural key Suppose that the primary key of the USERS table consists of a USERNAME and DEPARTMENT_NR. You can add a property named departmentNr to the User class and create the following mapping:

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