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R^ r; R r1 = *r; i = r1->P; // Declare a handle. // Dereference a handle. // Access a member using the -> operator.

Adding an object to a list and then having to explicitly save the object using the Save method is tedious. In some cases, you want this behavior. For example, imagine a scenario where the table references a set of constants. It would be very silly to add a new constant to the table whenever an association between two classes is made. In this example, where a comment is only associated with a single book, it isn t efficient. Using the attribute cascade, it s possible to have an object saved automatically, if it needs to be saved. Following is the slightly modified mapping configuration file for Book: <hibernate-mapping xmlns="urn:nhibernate-mapping-2.0"> <class name="Chap08.ObjectRelational.Book, Chap08.ObjectRelational" table="BOOKS"> <id name="ISBN" column="ISBN"> <generator class="assigned" /> </id> <property name="Title" /> <property name="Author" /> <bag name="Comments" cascade="all"> <key column="PARENT_ISBN" /> <one-to-many class="Chap08.ObjectRelational.Comment, Chap08.ObjectRelational" /> </bag> </class> </hibernate-mapping> The cascade attribute is associated with the XML tag bag. The attribute value of all indicates that all children of the object will be saved or updated. Another variation, all-delete-orphan, deletes all children when the parent is deleted. It would seem that all-delete-orphan isn t necessary because, by default, all children should be deleted. However, there are some situations in which you would want parent objects to be loaded and deleted without having deleted all of the children. The cascade attribute would seem like a life saver, but it s a double-edged sword. If a specific Book object instance is deleted, then all of the children will also be deleted. This can be useful when you want to maintain the consistency of the database, but could be problematic if by accident an object is deleted or if the children reference constants stored in another table.

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Note While it is possible to create your own GtkClipboard objects, when performing basic tasks,

gtk_clipboard_get().

// Declare a tracking reference and initialize to dereferenced handle. R% rref = *r; i = rref.P; // Access a member using the . operator.

Thus far it would seem all is OK in the example book application, when in fact under the covers, so to speak, multiple things are happening. First, the addition of a comment into the relational database isn t a single SQL statement, but two. The first is an INSERT statement that adds a comment to the COMMENTS table. The second is an UPDATE statement that associates the comment with the book. The two SQL statements are problematic because when the INSERT statement is executed, the PARENT_ISBN value is null. A few sections ago when the COMMENTS table was defined, there was no NOT NULL constraint, which allowed the addition of the comment. In most database designs, though, the PARENT_ISBN will have a constraint in that the value can t be null. Trying to execute an INSERT without a value for PARENT_ISBN will result in a database constraint error.

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