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Click to edit Master title

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Title: Click to edit Master title Author: Richard Chrisman Last modified by: Mirella Misiaszek Created Date: 10/23/2003 2:16:34 PM Document presentation format – PowerPoint PPT presentation

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Title: Click to edit Master title


1
1
2
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

3
Objectives (continued)
  • Create a dataset
  • Display a dataset in various controls in an
    interface
  • Position the record pointer in a dataset

4
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

5
Database Terminology (continued)
6
Database Terminology (continued)
7
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

8
ADO.NET (continued)
9
ADO.NET (continued)
10
Creating and Configuring a DataAdapter Object
11
Creating and Configuring a DataAdapter Object
(continued)
12
Creating and Configuring a DataAdapter Object
(continued)
13
Creating and Configuring a DataAdapter Object
(continued)
14
Creating and Configuring a DataAdapter Object
(continued)
15
Creating and Configuring a DataAdapter Object
(continued)
16
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

17
HOW TO
18
HOW TO (continued)
19
Using the Query Builder to Enter a SELECT
Statement
20
Using the Query Builder to Enter a SELECT
Statement (continued)
21
Using the Query Builder to Enter a SELECT
Statement (continued)
22
Using the Query Builder to Enter a SELECT
Statement (continued)
23
Using the Query Builder to Enter a SELECT
Statement (continued)
24
Using the Query Builder to Enter a SELECT
Statement (continued)
25
Using the Query Builder to Enter a SELECT
Statement (continued)
26
Creating a DataSet
27
Creating a DataSet (continued)
28
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

29
Creating a DataSet (continued)
30
Using the Fill Method
  • Method of the DataAdapter object
  • Fills a dataset with data while the application
    is running

31
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

32
HOW TO
33
Binding the Dataset Object to a DataGrid Control
(continued)
34
Reconfiguring the DataAdapter Object
35
Reconfiguring the DataAdapter Object (continued)
36
Reconfiguring the DataAdapter Object (continued)
37
Binding the Dataset Object to a Label Control or
Text box
38
Binding the Dataset Object to a Label Control or
Text box (continued)
39
Binding the Dataset Object to a Label Control or
Text box (continued)
40
Binding the Dataset Object to a Label Control or
Text box (continued)
41
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 items price

42
Programming Example Cartwright Industries
Application (continued)
  • Items.mdb database opened in Microsoft Access.
    Database contains one table tblItems

43
TOE Chart
44
User Interface
45
Objects, Properties, and Settings
46
Tab Order
47
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

48
Code
49
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

50
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

51
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

52
Summary (continued)
  • Use DataAdapter objects 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
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