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If you are unfamiliar with relational databases, you will need to get up to speed on the basics before doing any significant amount of testing. There are courses available at community colleges and many good books that can help you. Appendix C of this book lists some good resources. To get you started, here is a description of some of the major objects in a relational database:

Similarly, you will malloc a big chunk of memory for your vertex data arrays, big enough to hold the maximum number of particles Then during the update loop, when you emit new particles, you just grab them out of the pool and assign them their initial state This is so much faster than allocing new objects on the fly This becomes especially important for effects such as explosions where you need to emit lots of particles all at once When you build your data arrays for each frame, you just use as much of the vertex data space as you need and leave the rest as reserve..

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Tables: All data in relational databases is stored in table format. The rows of the table represent one record s worth of data. For example, each row in a Customers table would contain information about a single customer. The columns of the table represent individual pieces of data about the customer, such as the customer s name, address, and so on. Views: A view is an alternate way to look at data from one or more tables in the database. A view s contents are generated by a query and usually contain a subset of columns and rows from one or more tables. A view is considered a virtual table because it can be treated as though it were a table even though it isn t. For example, a view can store the SQL code to find all customers in the Customers table who live in Washington. That information actually resides in the Customers table, but since it is defined in a view, you can look at it in the view as though the view is a table itself. So, a view is really just a query that is stored and has a name. Stored procedures: A stored procedure allows the database programmer to write a set of SQL statements and give it a name so that it can be used over and over without having to rewrite it each time it is needed. Stored procedures usually contain multiple SQL statements and can be used to perform simple or complex database tasks.

[peers_new setObject:[peers objectForKey:peer] forKey:peer]; } BOOL peer_removed = (peers.count != peers_new.count); [peers release]; peers = peers_new; if (peer_removed) [[NSNotificationCenter defaultCenter] postNotificationName:@"PeersChanged" object:self];

To get a database view s columns, you can use the GetColumns servlet and, for the table parameter, pass the name of your desired database view name. Next, I ll show you how to the get the columns of views from MySQL and Oracle databases.

There is another way to refer to and use databases within .NET, and that is by setting a database reference within the Solution Explorer. Database connections created in the Database Explorer, as you saw in the preceding section, are not associated with any project and will stay until the connection is removed. (Although, these connections can be referenced in certain controls, as you ll see later in this chapter.) In contrast, database references can be created in the Solution Explorer that will be associated with the project. When you reopen the project, the database references are still there and are available to you. Using the Solution Explorer to maintain a set of database references can be very useful on a test project. You can maintain several database references that are kept with the project. As you develop and test your project, you might choose to keep one reference to a personal test database on your own machine and another reference to a group-wide test database that you share with your colleagues. To create a database reference in Solution Explorer (assuming you already have an open project), follow these steps: 1. Select the Data Add New Data Source menu item. The Data Source Configuration Wizard will display (see Figure 8-7).

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