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The IsDirty and IsValid concepts are relatively easy to implement. A collection is dirty if it contains child objects that are dirty, added, or removed. A collection s validity can be determined by finding out if all its child objects are valid. An invalid child object means that the entire collection is in an invalid state. Here are the properties: public bool IsDirty { get { // any deletions make us dirty if (DeletedList.Count > 0) return true; // run through all the child objects // and if any are dirty then then // collection is dirty foreach (C child in this) if (child.IsDirty) return true; return false; } } public virtual bool IsValid { get { // run through all the child objects // and if any are invalid then the // collection is invalid foreach (C child in this) if (!child.IsValid) return false; return true; } } Remember that the generic type C is the type of the child objects contained in the collection. As you can see, all the real work is done by the child objects, so the collection s state is really driven by the state of its children.

Tip If you are using Windows, you cannot use the MySQL test suite. However, you can still create the test

The idea that a collection can be a root object or a child object is particularly important. It s fairly obvious that a collection can be a child object an Invoice root object will have a LineItems collection that contains LineItem objects, so the LineItems collection is itself a child object. However, collection objects can also be root objects. An application may have a root object called Categories, which contains a list of Category objects. It s quite possible that there s no root object to act as a parent for Categories it may simply be an editable list of objects. To support this concept, BusinessListBase, like BusinessBase itself, must support these two modes of operation. In root mode, some operations are legal while others are not; in child mode, the reverse is true. As in BusinessBase, the collection object needs to know whether it s a root or a child object: [NotUndoable()] private bool _isChild = false; protected bool IsChild { get { return _isChild; } } protected void MarkAsChild() { _isChild = true; } This functionality is the same in BusinessBase, and it allows the business developer to mark the object as a child object when it s first created. The IsChild property will be used in the rest of BusinessListBase to adjust the behavior of the object (such as exercising control over deletion) accordingly.

The first thing you should do is create a new test to test the Spartan storage engine. Even though the engine doesn t exist yet, in the spirit of test-driven development you should create the test before writing the code. Let s do that now. The test file should begin as a simple test to create the table and retrieve rows from it. You can create a complete test file that includes all of the operations that I ll show you, but it may be best to start out with a simple test and extend it as you progress through the stages of building the Spartan storage engine. This has the added benefit that your test will only test the current stage and not generate errors for operations not yet implemented. Listing 7-7 shows a sample basic test to test a stage 1 Spartan storage engine. As you go through this tutorial, you ll be adding statements to this test, effectively building the complete test for the completed Spartan storage engine as you go. Listing 7-7. Spartan Storage Engine Test File (spartandb.test) # # Simple test for the Spartan storage engine # --disable_warnings drop table if exists t1; --enable_warnings CREATE TABLE t1 ( col_a int, col_b varchar(20), col_c int ) ENGINE=SPARTAN; DROP TABLE t1; You can create this file in the /mysql-test/t directory off the root of the source tree. When you execute it the first time, it s OK to have errors. In fact, you should execute the test before beginning stage 1. That way, you know the test works (it doesn t bomb out). If you recall from 4, you can execute the test by using the commands from the /mysql-test directory: