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Note Writing stored procedures in C#, also called managed stored procedures, doesn t just sound interesting, it actually is. However, managed stored procedures are very powerful weapons, and as with any weapon, only particular circumstances justify using them. Typically it makes sense to use managed stored procedures when you need to perform complex mathematical operations or complex logic that can t be easily implemented with T-SQL. However, learning how to do these tasks the right way requires a good deal of research, which is outside the scope of this book. Moreover, the data logic in this book didn t justify adding any managed stored procedures, and as a result you won t see any here. Learning how to program managed stored procedures takes quite a bit of time, and you might want to check out one of the books that are dedicated to writing managed code under SQL Server.

When we open the activity (onCreate()), or when the button is clicked (onClick()), we update the button s label to be the current time via setText(), which functions much the same as the JButton equivalent.

The stored procedures are stored internally in the database and can be called from external programs. In your architecture, the stored procedures will be called from the business tier. The stored procedures in turn manipulate or access the data store, get the results, and return them to the business tier (or perform the necessary operations). Figure 2-5 shows the technologies associated with every tier in the three-tier architecture. SQL Server contains the data tier of the application (stored procedures that contain the logic to access and manipulate data) and also the actual data store.

Figure 6-1. The circuit for Project 17 Shift Register 8-Bit Binary Counter (see insert for color version)

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To enable customers to place orders using ASP.NET membership, you need to make several modifications. You ll modify the database and business tier to enable customer orders to be placed and provide new code in the presentation tier to expose this functionality.

To build the activity, use your integrated development environment s (IDE s) built-in Android packaging tool or run ant in the base directory of your project. Then do the following to run the activity: 1. Launch the emulator by running the android command, choosing an AVD in the AVD Manager, and clicking the Start button. You should be able to accept the defaults in the Launch Options dialog. Figure 3 1 shows the Android home screen.

Enter the following code in Listing 6-1 and upload it to your Arduino. Once the code is run, you will see the LEDs turn on and off individually as they count up in binary every second from 0 to 255, then start again. Listing 6-1. Code for Project 17 // Project 17 int latchPin = 8; //Pin connected to Pin 12 of 74HC595 (Latch) int clockPin = 12; //Pin connected to Pin 11 of 74HC595 (Clock) int dataPin = 11; //Pin connected to Pin 14 of 74HC595 (Data)

As mentioned previously, the first thing to do is modify the database to make it ready to hold information about customer orders.

NOTE: The first time you use an AVD with the emulator, it will take substantially longer to start than it will subsequent times.

void setup() { //set pins to output pinMode(latchPin, OUTPUT); pinMode(clockPin, OUTPUT); pinMode(dataPin, OUTPUT); } void loop() { //count from 0 to 255 for (int i = 0; i < 256; i++) { //set latchPin low to allow data flow digitalWrite(latchPin, LOW); shiftOut(i); //set latchPin to high to lock and send data digitalWrite(latchPin, HIGH); delay(1000); } } void shiftOut(byte dataOut) { // Shift out 8 bits LSB first, on rising edge of clock boolean pinState; digitalWrite(dataPin, LOW); //clear shift register ready for sending data digitalWrite(clockPin, LOW); for (int i=0; i<=7; i++) { // for each bit in dataOut send out a bit digitalWrite(clockPin, LOW); //set clockPin to LOW prior to sending bit // if the value of DataOut and (logical AND) a bitmask // are true, set pinState to 1 (HIGH) if ( dataOut & (1<<i) ) { pinState = HIGH; } else { pinState = LOW; } //sets dataPin to HIGH or LOW depending on pinState digitalWrite(dataPin, pinState); //send bit out on rising edge of clock digitalWrite(clockPin, HIGH);

The Orders Table Currently the Orders table doesn t allow for as much information as you ll need to implement customer orders. There are also some modifications that you ll need in later chapters, so you need to add the new columns shown in Table 13-1 to the Orders table.

The ID of the customer that placed the order The current status of the order, which you ll use in later chapters to determine what stage of order processing has been reached; default value 0 The authentication code used to complete the customer credit card transaction The unique reference code of the customer credit card transaction

Install the package (e.g., run ant install).

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