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This technique has more meaning for dialect 1 than for dialect 3. However, it can be extrapolated to any dialect 3 date or time type if you need to store time of day as a string. The EXTRACT( ) function makes it possible to extract the individual elements of date and time types to SMALLINT values. The following trigger extracts the time elements from a dialect 1 DATE column named CAPTURE_DATE and converts them into a CHAR(13), mimicking the Firebird standard time literal 'HH:NN:SS.nnnn':

This next example also uses the AddSomeNumbers function, making a different type of mistake when it is declared: //incorrect type of parameters [DllImport("FlatAPILib.DLL" ,CharSet=CharSet.Unicode)] public static extern int AddSomeNumbers(char charOne, int numTwo); Here, we ve declared the first parameter as a char rather than an integer. We run the test with this code: //incorrect parameter type try { //this doesn't throw an exception. Instead, it uses the //unicode value of an 'A' (65) as an integer. int result = ErrorAndExceptionTest.AddSomeNumbers('A', 100); Console.WriteLine("Result from AddSomeNumbers = {0}", result); } catch(Exception e) { Console.WriteLine("Exception from AddSomeNumbers: {0}", e.Message); } If you expected to see the same EntryPointNotFoundException, you might be surprised with the result. As the code comments indicate, this test doesn t throw any exception at all. Instead, the interop marshaler is able to make the most of what we ve declared and find the matching function. How is it able to do this Remember that the char that we ve declared is actually a Unicode char (16-bit). PInvoke is able to pass the char to the unmanaged function as an integer. The result is that the unmanaged function adds the decimal value for the character 'A' (65) to the other number we passed as a parameter (100), and returns a value of 165: Result from AddSomeNumbers = 165 Not all mistakes end up as exceptions. More often than not, they end up as puzzling, incorrect results that require some investigation. In this case, it would have been easier to detect and correct the problem if we had received an exception.

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SET TERM ^; CREATE TRIGGER BI_ATABLE FOR ATABLE ACTIVE BEFORE INSERT POSITION 1 AS BEGIN IF (NEW.CAPTURE_DATE IS NOT NULL) THEN BEGIN NEW.CAPTURE_TIME = CAST(EXTRACT (HOUR FROM NEW.CAPTURE_DATE) AS CHAR(2))|| ':' || CAST(EXTRACT (MINUTE FROM NEW.CAPTURE_DATE) AS CHAR(2))|| ':' || CAST(EXTRACT (SECOND FROM NEW.CAPTURE_DATE) AS CHAR(7)); END END ^ SET TERM ;^

The CHAR(13) string stored by the trigger in the preceding example does not behave like a dialect 3 TIME type. However, by simple casting, it can be converted directly, in a later upgrade to dialect 3, to a dialect 3 TIME type. First, we add a temporary new column to the table to store the converted time string:

Date and Time Types ALTER TABLE ATABLE ADD TIME_CAPTURE TIME; COMMIT;

. gettype($a) . "\n"; . gettype($b) . ", \$b = $b\n";

Next, populate the temporary column by casting the dialect 1 time string:

See recipes 8-1 (Exposing Managed Code to COM+) and 8-8 (Using Role-Based Security).

UPDATE ATABLE SET TIME_CAPTURE = CAST(CAPTURE_TIME AS TIME) WHERE CAPTURE_TIME IS NOT NULL; COMMIT;

The next thing we need to do is temporarily alter our trigger to remove the reference to the dialect 1 time string. This is needed to prevent dependency problems when we want to change and alter the old time string:

You define $a as a string and then $b as the integer value of $a. Then you use the gettype() function to get a string representation of the variable type. The output from this script looks like this: gettype($a) gettype($b) gettype($a) gettype($b) = = = = string integer, $b = 10 array integer, $b = 1

SET TERM ^; RECREATE TRIGGER BI_ATABLE FOR ATABLE ACTIVE BEFORE INSERT POSITION 1 AS BEGIN /* do nothing */ END ^ SET TERM ;^ COMMIT;

Now, we can drop the old CAPTURE_TIME column:

The regsvcs utility is used to register and install an assembly of serviced components with COM+. What command-line options are provided to control the way an assembly is installed

ALTER TABLE ATABLE DROP CAPTURE_TIME; COMMIT;

Note Converting from arrays and objects to integers is undefined by the engine, but it currently works as

Create it again, this time as a TIME type:

ALTER TABLE ATABLE ADD CAPTURE_TIME TIME; COMMIT;

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