Objectives
This presentation is the property of its rightful owner.
Sponsored Links
1 / 52

Objectives PowerPoint PPT Presentation


  • 50 Views
  • Uploaded on
  • Presentation posted in: General

1. Objectives. Define the terms used when talking about databases Explain the purpose of the DataAdapter, Connection, and DataSet objects Explain the role of the provider Create and configure an OleDbDataAdapter object Write SQL SELECT statements. Objectives ( continued ). Create a dataset

Download Presentation

Objectives

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Objectives

1


Objectives

Objectives

  • Define the terms used when talking about databases

  • Explain the purpose of the DataAdapter, Connection, and DataSet objects

  • Explain the role of the provider

  • Create and configure an OleDbDataAdapter object

  • Write SQL SELECT statements

Microsoft Visual Basic .NET: Reloaded


Objectives continued

Objectives (continued)

  • Create a dataset

  • Display a dataset in various controls in an interface

  • Position the record pointer in a dataset

Microsoft Visual Basic .NET: Reloaded


Database terminology

Database Terminology

  • Database

    • Organized collection of related information stored in a file on a disk

  • Relational database stores information in tables composed of columns and rows

  • Table is a group of related records

    • Each row represents a record

    • Each column represents a row

      • Primary key is a field that uniquely identities a record in a table

      • Foreign key is a field in one table used as the primary key in another table

    • Tables are related by a common field or fields

Microsoft Visual Basic .NET: Reloaded


Database terminology continued

Database Terminology (continued)

Microsoft Visual Basic .NET: Reloaded


Database terminology continued1

Database Terminology (continued)

Microsoft Visual Basic .NET: Reloaded


Ado net

ADO.NET

  • A Connection object is used to establish a temporary connection to a database

  • Requests for information are then submitted using a DataAdapter object

    • The DataAdapter uses a provider which translates the request into a language the database understands

  • A DataSet stores a copy of the records and fields requested in a internal memory location

Microsoft Visual Basic .NET: Reloaded


Ado net continued

ADO.NET (continued)

Microsoft Visual Basic .NET: Reloaded


Ado net continued1

ADO.NET (continued)

Microsoft Visual Basic .NET: Reloaded


Creating and configuring a dataadapter object

Creating and Configuring a DataAdapter Object

Microsoft Visual Basic .NET: Reloaded


Creating and configuring a dataadapter object continued

Creating and Configuring a DataAdapter Object (continued)

Microsoft Visual Basic .NET: Reloaded


Creating and configuring a dataadapter object continued1

Creating and Configuring a DataAdapter Object (continued)

Microsoft Visual Basic .NET: Reloaded


Creating and configuring a dataadapter object continued2

Creating and Configuring a DataAdapter Object (continued)

Microsoft Visual Basic .NET: Reloaded


Creating and configuring a dataadapter object continued3

Creating and Configuring a DataAdapter Object (continued)

Microsoft Visual Basic .NET: Reloaded


Creating and configuring a dataadapter object continued4

Creating and Configuring a DataAdapter Object (continued)

Microsoft Visual Basic .NET: Reloaded


Objectives

SQL

  • Structured Query Language (SQL)

    • A set of commands that allows you to access and manipulate the data stored in many database management systems on computers of all sizes

    • SELECT statement allow you to specify which fields and records you want to view

    • WHERE clause limits records to be selected

    • ORDER BY clause sorts record display order

Microsoft Visual Basic .NET: Reloaded


How to

HOW TO…

Microsoft Visual Basic .NET: Reloaded


How to continued

HOW TO… (continued)

Microsoft Visual Basic .NET: Reloaded


Using the query builder to enter a select statement

Using the Query Builder to Enter a SELECT Statement

Microsoft Visual Basic .NET: Reloaded


Using the query builder to enter a select statement continued

Using the Query Builder to Enter a SELECT Statement(continued)

Microsoft Visual Basic .NET: Reloaded


Using the query builder to enter a select statement continued1

Using the Query Builder to Enter a SELECT Statement(continued)

Microsoft Visual Basic .NET: Reloaded


Using the query builder to enter a select statement continued2

Using the Query Builder to Enter a SELECT Statement (continued)

Microsoft Visual Basic .NET: Reloaded


Using the query builder to enter a select statement continued3

Using the Query Builder to Enter a SELECT Statement (continued)

Microsoft Visual Basic .NET: Reloaded


Using the query builder to enter a select statement continued4

Using the Query Builder to Enter a SELECT Statement (continued)

Microsoft Visual Basic .NET: Reloaded


Using the query builder to enter a select statement continued5

Using the Query Builder to Enter a SELECT Statement (continued)

Microsoft Visual Basic .NET: Reloaded


Creating a dataset

Creating a DataSet

Microsoft Visual Basic .NET: Reloaded


Creating a dataset continued

Creating a DataSet (continued)

Microsoft Visual Basic .NET: Reloaded


Creating a dataset continued1

Creating a DataSet (continued)

  • XML (Extensible Markup Language)

    • XML schema definition file defines the tables and fields that make up the data set

    • Schema file is automatically generated by VB.NET

    • Contents of file may be viewed in IDE

    • Contents of dataset can be preview by right clicking the DataAdapter object in the component tray and clicking Preview Data

Microsoft Visual Basic .NET: Reloaded


Creating a dataset continued2

Creating a DataSet (continued)

Microsoft Visual Basic .NET: Reloaded


Using the fill method

Using the Fill Method

  • Method of the DataAdapter object

  • Fills a dataset with data while the application is running

Microsoft Visual Basic .NET: Reloaded


Binding the dataset object to a datagrid control

Binding the Dataset Object to a DataGrid Control

  • Connecting a DataSet object to a control is called “binding”

  • Connected controls are referred to as “bound controls”

Microsoft Visual Basic .NET: Reloaded


How to1

HOW TO…

Microsoft Visual Basic .NET: Reloaded


Binding the dataset object to a datagrid control continued

Binding the Dataset Object to a DataGrid Control (continued)

Microsoft Visual Basic .NET: Reloaded


Reconfiguring the dataadapter object

Reconfiguring the DataAdapter Object

Microsoft Visual Basic .NET: Reloaded


Reconfiguring the dataadapter object continued

Reconfiguring the DataAdapter Object (continued)

Microsoft Visual Basic .NET: Reloaded


Reconfiguring the dataadapter object continued1

Reconfiguring the DataAdapter Object (continued)

Microsoft Visual Basic .NET: Reloaded


Binding the dataset object to a label control or text box

Binding the Dataset Object to a Label Control or Text box

Microsoft Visual Basic .NET: Reloaded


Binding the dataset object to a label control or text box continued

Binding the Dataset Object to a Label Control or Text box (continued)

Microsoft Visual Basic .NET: Reloaded


Binding the dataset object to a label control or text box continued1

Binding the Dataset Object to a Label Control or Text box (continued)

Microsoft Visual Basic .NET: Reloaded


Binding the dataset object to a label control or text box continued2

Binding the Dataset Object to a Label Control or Text box (continued)

Microsoft Visual Basic .NET: Reloaded


Programming example cartwright industries application

Programming Example – Cartwright Industries Application

  • Carl Simons, the sales manager at Cartwright Industries, records the item number, name, and price of each product the company sells in a database named Items.mdb

  • The database is contained in the VbDotNet\Chap12\Databases folder.

  • Mr. Simons wants an application that the sales clerks can use to enter an item number and then display the item’s price

Microsoft Visual Basic .NET: Reloaded


Programming example cartwright industries application continued

Programming Example – Cartwright Industries Application (continued)

  • Items.mdb database opened in Microsoft Access. Database contains one table tblItems

Microsoft Visual Basic .NET: Reloaded


Toe chart

TOE Chart

Microsoft Visual Basic .NET: Reloaded


User interface

User Interface

Microsoft Visual Basic .NET: Reloaded


Objects properties and settings

Objects, Properties, and Settings

Microsoft Visual Basic .NET: Reloaded


Tab order

Tab Order

Microsoft Visual Basic .NET: Reloaded


Pseudocode

Pseudocode

btnExit Click event procedure

1. close application

frmCartwright Load event procedure

1. fill the dataset with the item numbers and prices from the Items.mdb database

Microsoft Visual Basic .NET: Reloaded


Objectives

Code

Microsoft Visual Basic .NET: Reloaded


Summary

Summary

  • Databases created by Microsoft Access are relational databases:

    • Can contain one or more tables

  • Most tables contain a primary key that uniquely identifies each record

  • Data in relational database can be displayed in any order, and you can control the amount of information you want to view

  • Visual Basic .NET uses a technology called ADO.NET to access the data stored in a database

Microsoft Visual Basic .NET: Reloaded


Summary continued

Summary (continued)

  • Connection between a database and an application that uses ADO.NET is only temporary

  • To access data stored in a database, first create and configure a DataAdapter object, which is the link between the application and the Connection object

  • Use an OleDbDataAdapter object and an OleDbConnection object in applications that access Microsoft Access databases

Microsoft Visual Basic .NET: Reloaded


Summary continued1

Summary (continued)

  • DataAdapter, Connection, and DataSet objects are stored in component tray

  • Use SQL SELECT statement to specify fields and records for a dataset

  • Query Builder provides a convenient way to create a SELECT statement

  • Dataset contains data you want to access from the database

    • Data specified in SELECT statement associated with DataAdapter object

Microsoft Visual Basic .NET: Reloaded


Summary continued2

Summary (continued)

  • Use DataAdapter object’s Fill method to fill a dataset with data while an application is running

  • Users view data stored in a dataset through controls that are bound to DataSet object

  • Use DataGrid control to display records contained in a dataset

  • When you change the SELECT statement associated with a DataAdapter object, you must regenerate the dataset

Microsoft Visual Basic .NET: Reloaded


  • Login