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// wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } In this example, I define a short that is assigned a number outside the range that a byte is capable of representing and then perform an explicit conversion to a byte. This causes another unexpected value. Compiling and running the code in Listing 5-6 produces the following results: Original value: 500 Explicitly converted value: 244 Press enter to finish I recommend that you use explicit conversions sparingly; they tend to cause problems long after your program has been completed and sent to the user. When you wrote the code, you knew for certain that the value of this int could be safely expressed using a byte, but then something changes; the user starts dealing with larger numbers, and your program stops working. My advice is to over-allocate capacity when using numeric types; for most programs, the microscopic cost of the additional memory required is massively outweighed by the cost of identifying, fixing, and releasing a new version to resolve a problem caused by an injudicious explicit conversion. If you must use explicit conversions, then you should consider using overflow checking, described in the following section.
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All of these consequences must be handled with care in the belief that they may be fired more than once per row or be fired for a row that won t be updated by the statement after all. The second reason you should care about potential restarts is performance related. We have been using a single-row example, but what happens if you start a large batch update and it is restarted after processing the first 100,000 records It will roll back the 100,000 row changes, restart in SELECT FOR UPDATE mode, and do the 100,000 row changes again after that. You might notice, after putting in that simple audit trail trigger (the one that reads the :NEW and :OLD values), that performance is much worse than you can explain, even though nothing else has changed except the new triggers. It could be that you are restarting queries you never used in the past. Or the addition of a tiny program that updates just a single row here and there makes a batch process that used to run in an hour suddenly run in many hours due to restarts that never used to take place. This is not a new feature of Oracle it has been in the database since version 4.0, when read consistency was introduced. I myself was not totally aware of how it worked until the summer of 2003 and, after I discovered what it implied, I was able to answer a lot of How could that have happened questions from my own past. It has made me swear off using autonomous transactions in triggers almost entirely, and it has made me rethink the way some of my applications have been implemented. For example, I ll never send e-mail from a trigger directly; rather, I ll always use DBMS_JOB or something similar to send the e-mail after my transaction commits. This makes the sending of the e-mail transactional; that is, if the statement that caused the trigger to fire and send the e-mail is restarted, the rollback it performs will roll back the DBMS_JOB request. Most everything nontransactional that I did in triggers was modified to be done in a job after the fact, making it all transactionally consistent.
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In case you want to set the size of the billboards generated by your vertex shader or pass other information from your XNA app to your vertex shader, you somehow need to be able to add this information to the information contained in each vertex. You could do this by using, for example, VertexPositionNormalTexture and storing the size in a component in the Normal vector. However, this would simply move the problem, and you would meet the same problem again when you needed to pass real Normal data with your vertex data. So in order to remain general, you want to create your own vertex format, which can hold positional texture as well as some additional data. For more information on creating your custom vertex format, see recipe 5-14.
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// Code to implement the =+ operator
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