Download Beginning Visual Basic 2005 databases by Thearon Willis PDF

By Thearon Willis

As essentially the most renowned programming languages on the planet, visible uncomplicated keeps to extend at the performance and suppleness of its framework. This booklet explains the best way to use visible uncomplicated 2005 to write down effective database functions that may be used all through an firm.

With this educating instrument, you are going to the right way to use queries, perspectives, and saved techniques to successfully entry and control info out of your functions. you will get a company take hold of on utilizing ADO.NET in addition to OleDb, SQL, and Oracle to entry particular databases. Plus, hands-on examples and try-it-out routines assist you positioned your examining into perform in order that with each one bankruptcy, you are going to progressively construct the items of a unmarried application.

What you are going to study from this book

  • How ADO.NET keeps to adapt as a construction block for gaining access to and manipulating info in relational databases
  • Ways to encrypt and decrypt info, hash passwords, and additional safe entry for your data
  • Techniques for having access to your internet provider from either Windows(r) and net applications
  • Best practices for utilizing company good judgment and information entry parts to supply document facts or replace information on your back-end databases

Who this e-book is for

This booklet is for builders who are looking to learn how to write database functions and back-end databases, corresponding to Microsoft(r) entry, Microsoft(r) SQL Server, and Oracle(r). a few adventure with visible simple 2005 is useful yet no longer required.

Wrox starting publications are crafted to make studying programming languages and applied sciences more straightforward than you're thinking that, delivering a established, educational layout that would consultant you thru the entire concepts involved.

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Sample text

Joins are covered in more detail in Chapter 12. Normalizing a logical database design involves using formal methods to separate the data into multiple, related tables. Each method is typically referred to as a normal form. There are three normal forms to a normalized database: first normal form, second normal form, and third normal form. An over normalized database is normalized to fourth and fifth normal forms (which are not covered here) and is rarely considered practical in relational database design.

The term object is used to represent a set of information. You can also use the term entity in place of object. An entity is an object that refers to a person, place, or thing. If you know that you will be building an application that manages employees in your organization, you first identify which objects represent the information about an employee. For example, an employee is an object and the employee’s manager is an object. Next, you want to identify which attributes make up the employee and manager objects.

Again, you have a Location field, and multiple managers could work at the same location. Because you have already defined a Location table, you merely need to create a foreign key field in the Manager table pointing to the Location table. With the addition of these new tables, your database design would now look like the one shown in Figure 1-5. Employee Table Manager Employees Table Manager Table EmployeeID FirstName LastName PhoneNumber LocationID JobTitleID ManagerEmployeeID ManagerID EmployeeID ManagerID FirstName LastName PhoneNumber LocationID Job Title Table Location Table JobTitleID JobTitle LocationID Location Figure 1-5 Third normal form The rules of the third normal form dictate that you eliminate columns that do not depend on the primary key.

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