VB .net tutorial - 6

8/14/2019 VB .net tutorial - 6

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Accessing and Manipulating Data

NIIT Accessing and Manipulating Data/Lesson 6/Slide 1 of 33

Objectives

In this lesson, you will learn to:

Bind and display data in a Windows Form

Filter data

Sort data

Display data from multiple tables in a single Windows Form


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Problem Statement 6.D.1

An application needs to be created that allows the MarketingManager of Diaz Telecommunications to view the customerdetails in a customized format since the new product detailsare to be sent to all the customers. The customer details arelocated in the database at a remote call center.


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Task List

Identify the data that needs to be displayed.

Identify the mechanism to display data in a customized

format.

Design a Windows Form to display the data.

Connect to the database.

Bind the data to a Windows Form control.

View the data.


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Task 1: Identify the data that needs to be displayed.

Result:

As per the given problem statement, the data to be

displayed is as follows:

CustID

FName

LName

Address

Phone

email


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Task 2: Identify the mechanism to display data in acustomized format.

Data binding is the process of binding the retrieved data to a

control on a Windows Form to be displayed in acustomized format.

Data binding is of two types:

Simple Data Binding

Complex Data Binding

Result:

For the given problem statement, you will use complex databinding to display the data.


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Just a Minute

What is the difference between simple data binding andcomplex data binding? What are the controls used in eachtype of binding?


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Task 3: Design a Windows Form to display the data.

Task 4: Connect to the database.

Task 5: Bind the data to a Windows Form control.

Task 6: View the data.


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An application needs to be created that allows the MarketingManager of Diaz Telecommunications to view customerdetails since the new product details are to be sent to all thecustomers. In addition, the Marketing Manager should be ableto navigate through the customer details. The customer detailsare located in the database at a remote call center.


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Task List


Identify the mechanism to display data in a customized

format.

Identify the mechanism to navigate through the data.



Write the code to navigate through the data.


View the data.


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Result:


displayed is as follows:

CustID

Fname

Lname

Address

Phone

email


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Task 2: Identify the mechanism to data in acustomized format.

Result:

For the given problem statement, you will use simple databinding to bind and display the data.


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Task 3: Identify the mechanism to navigate throughthe data.

The CurrencyManager class

Exists for every data source that is bound to a WindowsForm.

Object handles the binding to the data source bykeeping a pointer to the current item in the record list.

Is derived from the BindingManagerBase class.

A BindingContext object, which is a Windows Formobject, is used to keep track of the existing

CurrencyManager objects in a form.


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Task 3: Identify the mechanism to navigate throughthe data. (Contd.)

Relationship between the BindingContext class,CurrencyManager class, and Windows Form:

Windows FormControl 1Control 2Control 3

BindingContextobject

CurrencyManager 1

CurrencyManager 1

CurrencyManager 1

DATA SOURCE 1

DATA SOURCE 1

DATA SOURCE 1


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Task 3: Identify the mechanism to navigate throughthe data. (Contd.)

Result:

You will use the BindingManagerBase class and theBindingContext() method to navigate through therecords.



Task 6: Write the code to navigate through the data.




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An application needs to be created for the Marketing Managerof Diaz Telecommunications to view the order details for aspecific invoice to verify the monthly sales report.


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Task List


Identify the method to filter and sort the data.

Identify the method to navigate through the data.


Connect to the database, and filter and sort the data.


View the data.


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Result:


displayed is as follows: Inv

Date

CustID

ProdID

Cost

Advance


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Task 2: Identify the method to filter and sort the data.

There are two methods to display filtered data:

Parameterized queries

Filter data based on the criterion entered by a userat run time.

Are created while configuring data adapters.

Filtering a dataset

After the data is retrieved in a dataset, the data canbe filtered by:

Using the Select() methodFiltering a data view


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Task 2: Identify the method to filter and sort the data.(Contd.)

The Select() method

Used to filter data without changing the order of therecords in the table based on the parameter passed.


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Just a Minute

The records of customers having monthly income of $4200needs to be displayed in ascending order of their names fromthe table Employees. Write the code to retrieve filtered recordsand store the retrieved records.


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Filtering a data view

A DataView object creates a fixed customized view ofa given DataTable object.

By default, every table in a dataset has a data viewattached to it.

Multiple DataView objects can also be explicitlycreated for displaying different views of the sameunderlying data.


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Some commonly used properties of the DataViewobject:

Table

Sort

RowFilterRowStateFilter

AllowNew, AllowDelete, AllowEdit


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Result:

You will use a parameterized query to filter and sort thedata, as it requires you to write minimum code.


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Just a Minute

The name, date of joining, and department of the employeeswith salary greater than $2000 need to be retrieved anddisplayed in a DataGrid control. Write the code to filter the

data and display the filtered data.


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Task 3: Identify the method to navigate through thedata.

Result:

You will use the BindingManagerBase class and theBindingContext() method to navigate through the data.


Task 5: Connect to the database, and filter and sortthe data.




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An application needs to be created for the DiazTelecommunications Marketing Manager to view customerdetails, such as the name and address, and order details for a

specific customer for analyzing customer feedbacks. Thecustomer details and the order details are present in separatetables.


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Task List


Identify the mechanism to display data from multiple tables

in a single Windows Form.Design a Windows Form to display the data.


Create a relationship between the tables.

Bind the data to the Windows Form controls.

View the data from multiple tables in a single Windows

Form.


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Result:


displayed is as follows: FName

Address

ProdID

Inv

Date

CustID


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Task 2: Identify the mechanism to display data frommultiple tables in a single Windows Form.

Tables are stored in a dataset as discrete entities but arelationship can be created between the stored tables todisplay data from the related tables.

The column that is common in both the tables is used tocreate the relationship.

Result:

You will create a relationship between CustomerTrackingand CustOrder tables to display the data from both thetables.


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Task 5: Create a relationship between the tables.

Task 6: Bind the data to the Windows Form controls.



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Summary

In this lesson, you learned that:

After the data is retrieved from the database, it has to be

bound to a Windows Form control to be displayed in acustomized format.

Data binding is of two types:

Simple data binding

Complex data binding

Using parameterized queries, the data can be filteredbased on the criterion entered by a user.


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Summary (Contd.)

After the data is retrieved in a dataset, you can filter thedata stored in the dataset by:

Using the Select() method

Using DataView objects

A DataView object allows a fixed customized view of agiven DataTable object.

A data view manager is a collection of data viewsand is useful while working with related tables.


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Summary (Contd.)

A CurrencyManager object handles the binding to thedata source by keeping a pointer to the current item in therecord list.

A BindingContext object is used to keep track of theexisting CurrencyManager objects on a form.

Tables are stored in a dataset as discrete entities, but a

relationship can be created between the stored tables sothat the dataset displays data from the related tables.

VB .net tutorial - 6

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