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Imagine iterating through your book collection, and displaying the results in a dialog box for further selection. The example code as it s written would load all of the data. This means loading all books and their associated comments a data retrieval explosion that could lead to very slow reaction times. What you want in this instance isn t to load everything, but only to load the immediate information. NHibernate has a technique called lazy loading, where the data is loaded when it s needed. To implement lazy loading, it s only necessary to change the Book mapping configuration file to the following: <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" inverse="true" cascade="all" lazy="true"> <key column="PARENT_ISBN" /> <one-to-many class="Chap08.ObjectRelational.Comment, Chap08.ObjectRelational" /> </bag> </class> </hibernate-mapping> Again, the bag XML tag is modified to include an additional attribute, lazy, with a value of true. This tells NHibernate to not load everything at once. Instead, the data will only be loaded when it s referenced.

This tells PostgreSQL to let hosts that use TCP/IP using the toymaster user to connect to the toys database. These hosts must belong to the network 192.168.1.0. When authenticating, the server must first check whether the PostgreSQL user toymaster exists. If so, the server will retrieve the MD5encrypted password from the remote host. When the remote host's password matches to the server's password database, it is allowed to use the toys database. You can change the behavior of authentication so that you aren t forced to make identical system users for the PostgreSQL users, by changing the ident sameuser entry to something else. For example, you can use md5 so the server still asks the remote host to identify it without having identical system users checked before connecting. As with any configuration file change, you need to reload the server for the modifications to take effect. Now that you know how to administer both MySQL and PostgreSQL at the system level, it is time to learn about administration at the database level. The next section looks at some fundamental database language that encompasses CRUD.

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Figure 2-2. The Hello World window at the default size Even though the window includes the standard X on the right side of the title bar, you ll notice that clicking that X will only cause the window to disappear. The application continues to wait for events, and control will not be returned to the launching terminal until you press Ctrl+C. You will learn how to implement a shutdown callback with signals in the next example.

CRUD is the acronym for Create, Read, Update, and Delete, the four major functions for software. Software almost always creates, reads, updates, and deletes something, such as lists and data structures. Databases are no exception because they are also software, specializing in storage. CRUD translates directly to SQL, including both MySQL and PostgreSQL. Whenever an object is created, viewed, updated or destroyed, an associated SQL statement is used for that operation. Table 121 shows the association of CRUD to SQL. Table 12-1. Mapping CRUD to SQL

Up to this point, you have only learned about one type of cell renderer, GtkCellRendererText. This renderer allows you to display strings, numbers, and Boolean values as text. You are able to customize how the text is displayed with cell renderer attributes and cell data functions and allow it to be edited by the user. GTK+ provides a large number of cell renderers that can display other types of widgets besides text. These are toggle buttons, images, spin buttons, combo boxes, progress bars, and accelerators, which will all be covered in this section.

There are other types of relationships, like many-to-many, and other types of collections, like maps and sets. For example, if the XML tag map were used, then NHibernate would associate an IDictionary instead of an IList with a child collection. The techniques for dealing with these relationships are based on the same techniques illustrated in the simple example of the parentto-child relationship. The difference for these other relationships isn t complexity, but getting the mapping configuration file correct. So for a many-to-many mapping, instead of only having a bag XML tag in the parent, there would also be a bag tag in the child referencing back to the parent. These topics are beyond the scope of this book.

As systems administrators handling RDBMSs such as MySQL and PostgreSQL, do we actually need to learn all of SQL Not really, because once you get to know the basics through CRUD, it can largely get you by. For most purposes, only developers who write database-enabled software need to learn more of the language.

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