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This root element of the build file defines the project name and base directory from which all other paths in the file will be built. The default=run attribute specifies that the target named run within the project will be invoked by default if no other target is specified on the command line. This is a task definition for the custom task we build later, in section C.3. As we will see, there are two ways to make your custom task classes available within an Ant project. These are the project target definitions. The depends attribute lists other targets that should be evaluated before this one, allowing you to build a dependency tree among targets. For example, if you invoke Ant to run the compile task,

ALTER DATABASE testdb SET ALLOW_SNAPSHOT_ISOLATION ON;

Make sure you still have the code from Listing 6-5 in connection 1 . Open a new connection (call it connection 4), and have the following code ready:

After you have enabled mirrored mode on the mobile PC, you should see a duplicate image of your mobile PC screen on the projector screen. It is not uncommon, however, to run into problems when switching to mirrored mode. If the image is not displaying correctly on the projector screen, right-click the desktop, and then click Properties. In the Display Properties dialog box, click the Settings tab, and then try one of the following:

SET NOCOUNT ON; USE testdb; SET LOCK_TIMEOUT 30000; WHILE 1 = 1 BEGIN UPDATE dbo.T1 SET col1 += 1; WAITFOR DELAY '00:00:01'; END

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This code simply issues an UPDATE against T1 every second . Now run the code in connection 1, and immediately start the code in connection 4 as well . The code in connection 1 keeps reading from T1, waiting five seconds, and then writing to T1 . Because connection 4 changes T1 every second, connection 1 will encounter plenty of update conflicts . Feel free to stop the execution in connection 4 from time to time to see that connection 1 at some point will finish successfully . If you just allow connection 4 to keep running, after three retries connection 1 will produce the following output:

targets will be evaluated in the following order:

Update conflict detected. Retry #1. Update conflict detected. Retry #2.

In this section, I ll describe calculations that return the first and last occurrences of a certain weekday in a period such as a month or year . To calculate the first occurrence of a certain weekday in a month you need to combine two types of calculations that I described earlier . One is the calculation of the first day of the month:

SELECT DATEADD(month, DATEDIFF(month, '19000101', SYSDATETIME()), '19000101');

1 2 3

The other is the calculation of the next occurrence of a weekday, inclusive Monday in this example:

SELECT DATEADD(day, DATEDIFF(day, '19000101', DATEADD(day, -1, SYSDATETIME())) /7*7 + 7, '19000101');

The trick is to simply use the first day of the month calculation as the reference date within the next weekday occurrence calculation . For example, the following expression returns the first occurrence of a Monday in the reference month:

This target compiles all Java files in the source directory and places the compiled classes into the build directory by calling the javac task. Note that it depends on two tasks, which are evaluated in the order in which they appear. This is a call to the javac task, passing a reference to our dynamically constructed CLASSPATH. This is a call to a custom task we develop ourselves in section C.3.

SELECT DATEADD(day, DATEDIFF(day, '19000101', -- first day of month DATEADD(month, DATEDIFF(month, '19000101', SYSDATETIME()), '19000101') -1) /7*7 + 7, '19000101');

To handle a different weekday, replace the anchor date in the part of the expression that calculates the next occurrence of a weekday not in the part that calculates the first month day . The following expression returns the date of the first occurrence of a Tuesday in the reference month:

SELECT DATEADD(day, DATEDIFF(day, '19000102', -- first day of month DATEADD(month, DATEDIFF(month, '19000101', SYSDATETIME()), '19000101') -1) /7*7 + 7, '19000102');

There is no image at all on the projector screen. -orThere is a flickering image on the projector screen. There is an image on the projector screen, but it is partially off of the screen and you have a laptop with a widescreen.

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