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However, using the flashback query, either the AS OF SCN or AS OF TIMESTAMP clause, we can ask Oracle to reveal to us what was in the table as of that point in time: scott%ORA11GR2> select count(*), 2 :scn then_scn, 3 dbms_flashback.get_system_change_number now_scn 4 from emp as of scn :scn; COUNT(*) THEN_SCN NOW_SCN ---------- ---------- ---------14 6294536 6294537 Further, this capability works across transactional boundaries. We can even query the same object as of two points in time in the same query! That opens some interesting opportunities indeed: scott%ORA11GR2> commit; Commit complete. scott%ORA11GR2> select cnt_now, cnt_then, 2 :scn then_scn, 3 dbms_flashback.get_system_change_number now_scn 4 from (select count(*) cnt_now from emp), 5 (select count(*) cnt_then from emp as of scn :scn) 6 / CNT_NOW CNT_THEN THEN_SCN NOW_SCN ---------- ---------- ---------- ---------0 14 6294536 6294539 Finally, if you are using Oracle10g and above, you have a command called flashback that uses this underlying multi-versioning technology to allow you to return objects to the state they were at some prior point in time. In this case, we can put EMP back the way it was before we deleted all of the information: scott%ORA11GR2> flashback table emp to scn :scn; Flashback complete. scott%ORA11GR2> select cnt_now, cnt_then, 2 :scn then_scn, 3 dbms_flashback.get_system_change_number now_scn 4 from (select count(*) cnt_now from emp), 5 (select count(*) cnt_then from emp as of scn :scn) 6 / CNT_NOW CNT_THEN THEN_SCN NOW_SCN ---------- ---------- ---------- ---------14 14 6294536 6294552 This is what read consistency and multi-versioning are all about. If you don t understand how Oracle s multi-versioning scheme works and what it implies, you won t be able to take full advantage of Oracle or write correct applications in Oracle (ones that will ensure data integrity).

TRY IT!

Add a new content pipeline project to your solution by going through the ten steps explained in recipe 4-15. This time, however, you will not need to define your custom processor. All you need to do is define the MapData class, together with an appropriate TypeWriter and TypeReader.

tion-style tests (in Java or .NET) against your application, and then change or add to them easily without needing to write code. Using the FitNesse framework involves three steps:

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static void Main(string[] args) { // create an array of XElements List<XElement> myElements = new List<XElement>() { new XElement("Name", "Orange"), new XElement("Size", "Large"), new XElement("ItemsInStock", 250), }; // create an element using the array XElement myFruit = new XElement("Fruit", myElements); // save the XML fragment to a file myFruit.Save("fragment.xml"); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } In Listing 29-8, I call the Save method on an XElement object and provide the name of the file I want to write to as a string parameter. This saves the XML to the specified file. The contents of the file are as follows: < xml version="1.0" encoding="utf-8" > <Fruit> <Name>Orange</Name> <Size>Large</Size> <ItemsInStock>250</ItemsInStock> </Fruit> Notice that the XML declaration is added even though I wrote a fragment to the file. There are overloaded versions of the Save method, which are described in Table 29-3. Table 29-3. Overloaded versions of the Save Method

Listing 13-8 contains a simple example of a for statement to enumerate the contents of a three-item string array. Listing 13-8. Enumerating with a for Statement using System; class Listing 08 { static void Main(string[] args) { string[] names = { "oranges", "apples", "guava" }; for (int i = 0; i < 3; i++) { Console.WriteLine("Item: {0}", names[i]); } // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } A for statement, also known as a for loop, has five parts: the for keyword, the initializer, the condition, the iterator, and the code statements. These parts are illustrated in Figure 13-3.

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