The company has asked you to build a prototype of an n-tier system using the Northwind database as an example. The company wants to be able to add, edit, and delete records from the customers, orders, order details, products, categories, and supplier’s tables. Your instructor will provide you the online link to the SQL Server database files (MDF and LDF).
Assignment Guidelines
• Create the Data Access tier and Data tier projects:
1. Create a class library project for the Data tier.
2. Add a new class library project the project created in Step 1 for the data access tier.
3. Add a typed DataSet using a new data source that connects to the Northwind sample database.
4. Select the database objects (customers, orders, order details, products, categories, and suppliers) tables.
5. Make sure the TableAdapters are stored in the Data Access tier and the DataSet class is added to the Data tier.
• Make sure that separate tiers are created for each layer by verifying that separate class libraries were created and the necessary references to the project were added.
•Using the project, you started in Week 2 Individual Project, verify the business logic layer (middle tier) is working correctly and make the connection to the database, implementing the logic in the data layer provided to manipulate the data stored in the database portion of the n-tier system.
Assignment Guidelines
• Add the following to the Phase 2 individual project:
o Add a new Windows Communication Foundation (WCF) service library project to the Phase 2 individual project to communicate with the Data Access tier.
o Add the necessary queries and methods to the table adapters that will return, add, edit, and delete the data from the tables specified in Phase 2.
o Add references in the Data Service to the Data tier and Data Access tier projects.
o Add methods to the Data Service class created in Step 1 that will call into the Data Access tier.
• Make sure that separate tiers are created for each layer by verifying that separate class libraries were created and the necessary references to the project were added.
Assignment4_1.java as the file name and Assignment4_1 as the class name – Write a console program with a static method printHello() (in addition to main() method which is also static) that prints out “Hello World”. Call that method from main(). Assignment4_2.java as the file name and Assignment4_2 as the class name – Write a console program with static method inc() that takes value of type int and returns that value increased by one. In main() method do the following: Ask a user to enter an integer value Call method inc() and pass user input (integer value) into that method Print returned result Assignment4_3.java as the file name and Assignment4_3 as the class name – Write a console program with static method inc() that takes value of type int and returns that value increased by one. In main() – public static void localModification(int a) { a++; } Call that method from main() while passing some integer value stored in a variable, for instance: public static void main(String[] args) { int A = 5; localModification(A); System.out.println(A); } Make sure that value of A, printed in main(), is not affected by local modification made within the localModification() method, i.e. value 5 is printed. Try to understand why. Task: Change declaration and/or implementation and/or call of the localModification() method, such that print statement in main() method prints incremented value, i.e. 6.
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