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Properties are a special type of method. They are used to access and modify variables in a structure or class. Instead of passing arguments to a property, you use the assignment operator, as in MyProperty = 5. With property procedures, you can add code to control the way your program sets a variable s value. This code can also control the way a program gets a variable s values. While we cover property procedures in 6, here is a quick look at what one of these looks like: VB .NET 'This variable is private and must be accessed or 'modified with the property Quantity Private intQuantity As Integer Public Property Quantity () As Integer 'This part of the property procedure runs when code asks to read Quantity Get Return intQuantity End Get 'This part of the property procedure run when code asks to change Quantity Set (ByVal Value As Integer) If Value < 0 Then ' This is an example of some validation code. intQuantity = 0 'Sets the all negative numbers to zero Else intQuantity = Value End If End Set End Property Sub Main() Quantity = 5 'Sets the value of Quantity Console.WriteLine(Quantity) 'Reads the value of Quantity Quantity = -5 'Try to set the value of Quantity to a negitive number Console.WriteLine(Quantity) 'Reads Quantity and shows 0 End Sub

Sometimes, for a given problem, there are different solutions based on the database vendor For example, the code that gets the table names for an Oracle database is different from the code that gets the tables names for a MySQL database When you develop an application or framework for a relational database, be sure that your connection pool manager takes the vendor name as a parameter Depending on the vendor name, you might be calling different methods, or you might be issuing a different set of SQL queries For example, when you re using the BLOB data type, the vendor name makes a difference in reading or writing BLOB data For instance, Oracle requires an empty_blob() function use for setting empty BLOBs, but MySQL does not (empty BLOBs are denoted by NULL in MySQL) The vendor name also plays an important role in connection pool management and database metadata.

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In the update method, which is called every frame by the game loop, you will check to see whether the emitter has been shut down. If so, then you reset the emitCount to be ready for another explosion:

C# static private int intQuantity; static public int Quantity { //This part of the property procedure runs when code asks get { return intQuantity; } //This part of the property procedure runs when code asks set { if (value < 0) // This is an example of some validation {intQuantity = 0;} //Sets the all negative numbers to else {intQuantity = value;} } }//End of property

Suppose you have a pool of connections that you use in a production environment If for some reason the database server goes down, then all of the connections in the pool will be obsolete or defunct that is, they become dead connections Using a dead connection will throw an exception One of the important tasks a pool manager must do is that, before handing a connection to the client, it must make sure that the connection is valid For this reason, a pool manager must issue a minimal SQL query against that database to make sure that the connection is valid If it is valid, then it can be given to a client; otherwise, you need to obtain another available connection or throw an exception This minimal SQL query is called a validity check statement, which can differ from vendor to vendor.

static void Main() { Quantity = 5; //Sets the value of Quantity Console.WriteLine(Quantity); //Reads the value of Quantity Quantity = -5; //Try to set the value of Quantity to a negitive number Console.WriteLine(Quantity); //Reads Quantity and shows 0 }

-(void)emitButtonDown { particles.emit = YES; }

Summary

Ahh, yes, the emit button. The Scene class provides a big overlay button that lays overtop the entire screen area, except where the scene-switching buttons are. It provides a method callback for that big overlay button, and it is called emitButtonDown. You will use this to your advantage in many scenes. In this case, you are just turning the emitter on. The emitter will run for 0.1 seconds and then shut itself off. At some point after that, your update will be called, and you will reset the emitCount so you can start over again. This means that just about every time you tap the screen, you will get an explosion of white particles. One thing I must apologize for: it is hard to take good screenshots of particle systems. The beauty of the system is in its ever-changing and fluid nature. A screen capture robs the system of its best quality: the emitter s appearance over time. So, you will need to either be very imaginative or quickly build the app for yourself and try it. Figure 1-9 is a good example, because a static shot it is just a bunch of white dots, but in motion it is so much more.

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