MIS 312 Lab Manual

5/21/2018 MIS 312 Lab Manual

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Yarmouk University

Faculty of IT and Computer Sciences

Department of Management Information Systems

MIS 312 Programming for MIS Lab

Lab Manual

Prepared By:Ala'a AL-Aalawneh


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Table of Content

Week 1 and 2: Chapter 2: Visual Basic, Controls, and Events ........................................... 3

Week 3: Chapter 3: Numbers, Variables, and Strings ...................................................... 13

Week 4: Chapter 8: Sequential Files ................................................................................. 17

Week 5: Chapter 4: Decisions (If Blocks/ Select Case Blocks) ....................................... 18

Week 6: Chapter 9: Additional Controls and Objects (List Boxes/ Combo Boxes) ......... 23

Week 7: Chapter 5: General Procedures (Sub Procedures) .............................................. 25Week 8: Chapter 5: General Procedure (Function Procedures) ........................................ 27

Week 9: Chapter 6: Repetition (Loops) ............................................................................ 29

Week10: Chapter 10: Database Management and SQL ................................................... 34Week 11: Chapter 10: Database Management (Binding a listbox to a datatable) ............ 40

Week 12: Chapter 10: Database Management (Setting Criteria/ Tables Join) ................. 42

Week 13: Chapter 10: Database Management (Data Grid View/ Changing contents) ..... 45

Week 14 & 15: Chapter 10: SQL (insert, delete and update sql statement) ..................... 49


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Week 1 and 2: Chapter 2: Visual Basic, Controls, and Events 2.1 An Introduction to Visual Basic

2.2 Visual Basic Controls

2.3 Visual Basic Events

Lesson 1

2.1 An Introduction to Visual Basic & visual basic controls

Learning outcome: be able to: Develop a Visual Basic Application Design the Interface for the user.

start a new project

know the toolbox control

how to change the properties of control using properties windows Determine which events the controls on the window should recognize.

Write the event procedures for those events.

- Visual Basic Start Page


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- Start a New Project

New Project Dialog Box


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Initial Visual Basic Screen

Toolbox control:

Place a Control from the Toolbox onto the Form Window by using one ofthree ways: Double-click

Drag and Drop Click, Point, and Drag


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Properties WindowPress F4 to display the Properties window for the selected control

Categorized view Alphabetical view

Textbox

propertiesse


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Properties Window

Some Often Used Properties Text

Autosize

Font.Name

Font.Size ForeColor

BackColor

ReadOnly

Setting Properties

Click on property name in left column.

Enter its setting into right column by typing or selecting from options displayed

via a button or ellipses.

Setting the Text Property Click on Text property.

Type your first name


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Setting the ForeColor Property Click on ForeColor.

Click on button at right of settings box.

Click on Custom tab to obtain display shown.

Click on a color.

Font Property Click on Font in left column.

Click on ellipsis at right of settings box to obtain display shown,

Make selections


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Button Control The caption on the button should indicate the effect of clicking on the button.

Text property determines caption

Task :Create a program with:

form name your name

yellow button containing the word VB in a large italic,centralized and red letter

read-only textbox containing the words" Visual Basic" in bold, centralized whiteletter and red background.


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Lesson 2:

2.3 Visual Basic EventsLearning outcome for this sections:

Know how to Write the code that executes when events occur

Change the properties of controls using code

General Form:

contr olName.property = setting

Code Editor

Code Editor tab Form Designer tab

header Structure of an Event Procedure

Private SubobjectName_event(...)

HandlesobjectName.event

statements

End Sub

(...) is filled automatically with (By Val sender As System.Object, By Val e As

System.EventArgs


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Sample Form

Double Click on txtFirst

Public ClassfrmDemo

Private SubtxtFirst_TextChanged(...)

HandlestxtFirst.TextChanged

End SubEnd Class

PublicClassfrmDemo



txtFirst.ForeColor = Color.Blue

End Sub

End Class

Automatically pops up to give the programmer help.txtFirst.

Double-click on btnRed

Public ClassfrmDemo


txtfirst

txtsecond

btnred


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End Sub

Private SubbtnRed_Click(...)

HandlesbtnRed.ClicktxtFirst.ForeColor = Color.Red

End Sub

End Class

Event Procedure txtFirst.Leave

Select txtFirst from Class Name box drop-down list.

Select Leave from Method Name box drop-down list.

Private SubtxtFirst_Leave(...) HandlestxtFirst.Leave

txtFirst.ForeColor = Color.Black

End Sub

Private SubtxtFirst_TextChanged() HandlestxtFirst.TextChanged


End Sub

Private SubbtnRed_Click(...) HandlesbtnRed.ClicktxtFirst.ForeColor = Color.Red

End Sub

Altering Properties of the FormThe following won't work:

frmDemo.Text = "Demonstration"

The form is referred to by the keyword Me.

Me.Text = "Demonstration


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Week 3: Chapter 3: Numbers, Variables, and Strings 3.1 Numbers

3.2 Strings

3.3 Input and Output

Lesson 1: Numbers and variables

Learning outcomes :- be able to know how to display numbers in a listbox

- be able to know how to declare a variables

Displaying NumbersLet nbe a number or a numeric expression.The statement:

lstBox.Items.Add(n) displays the value of nin the list box.

Example:

Code and output:Private SubbtnCompute_Click (...)HandlesbtnCompute.Click

lstResults.Items.Add(5)lstResults.Items.Add(2 * 3)

lstResults.Items.Add((2 ^ 3)1)

End Sub

Output in list box 5

67


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Declaration of variables

Numeric variables are automatically initialized to 0:

Dim varName As Double

To specify a nonzero initial valueDimvarName As Double= 50

Numeric variables can be used in numeric

expressions.

Example:

DimbalanceAsDouble= 1000

lstBox.Items.Add(1.05 * balance)

Output:1050

Lesson 2: Strings

Learning outcomes:- be able to know how to declare a string.

- Be able to know string's method and properties

Strings declarationYou can declare a string variable and assign it a value at the same time.

DimfirstName As String= "Fred"

Add MethodLet str be a string literal or variable. Then,

lstBox.Items.Add(str)displays the value of str in the list box.

Using Text Boxes for Input and OutputThe contents of a text box is always a string

example

strVar = txtBox.Text

Output example

txtBox.Text = strVar

String Properties and Methods"Visual".Length is 6.

"Visual".ToUpper is VISUAL."123 Hike".Length is 8.

"123 Hike".ToLower is 123 hike.

"a" & " bcd ".Trim & "efg" is abcdefg.


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Substring MethodLet str be a string.

str.Substring(m, n) is the substring of lengthn, beginning at position m in str.

Visual Basic.Substring(2, 3) is suaVisual Basic.Substring(0, 1) is V

IndexOf MethodLet str1 and str2 be strings.

str1.IndexOf(str2)

is the position of the first occurrence of str2 in str1.

(Note:Has value -1 if str2 is not a substring of str1.)

"Visual Basic".IndexOf("is")is 1.

Task#2

Write a program that parses a name:Private Subbtnanalyze_Click (...)Handlesbtnanalyze.ClickDimfullname, firstname, lastname as string

Dimn as integer

Fullname=txtname.textN=fullname.indexof(" ")

Firstname=fullname.substring(0,n)

Lastname=fullname.substring(n+1)

Lesson 3:Input and Output

Learning outcomes:Be able to know how to Format Output with ZonesReading Data from Files

Formatting Output with Zones:Use a fixed-width font such as Courier New and divide the characters into zones with

a format string.DimfmtStr As String= "{0, 15}{1, 10}{2, 8}"

lstOutput.Items.Add(String.Format(fmtStr, _data0, data1, data2))

DimfmtStr As String= "{0, 15}{1, 10}"

lstOutput.Items.Add(String.Format(fmtStr, _Name, Major))

lstOutput.Items.Add(String.Format(fmtStr,_Mohammed, MIS))

lstOutput.Items.Add(String.Format(fmtStr, _Ahmed, CIS))


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Reading Data from FilesSample File: PAYROLL.TXTMike Jones

9.35

35John Smith

10.75

33

Steps to Use StreamReader

Execute a statement of the form

DimreaderVar As IO.StreamReader = IO.File.OpenText(filespec)

Read items of data in order, one at a time,from the file with the ReadLine method.

strVar = readerVar.ReadLine

After the desired items have been read from the file, terminate the communications linkreaderVar.Close()

Example using StreamReaderDimname As String

Dimwage, hours AsDouble

Dimsr As IO.StreamReader = IO.File.OpenText("PAYROLL.TXT")name = sr.ReadLine

wage = CDbl(sr.ReadLine)

hours = CDbl(sr.ReadLine)

lstBox.Items.Add(name & ": " & wage * hours)

OUTPUT: Mike Jones: 327.25


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Week 4: Chapter 8: Sequential Files

8.1 Sequential Files

8.2 Using Sequential Files

Lesson 1: sequential files:Learning outcomes: be able to know how to:

Create a Sequential File

Add Items to a Sequential File

Creating a Sequential File

1.Choose a filenamemay contain up to 215 characters

2.Select the path for the folder to contain this file3.Execute a statement like the following:

Dimsw As IO.StreamWriter = IO.File.CreateText(filespec)

(Opens a file for output.)

4.Place lines of data into the file with statements of the form:sw.WriteLine(datum)

5.Close the file:

sw.Close( )

Example:

Private SubbtnCreateFile_Click(...) _HandlesbtnCreateFile.Click

Dimsw As IO.StreamWriter=IO.File.CreateText("PAYROLL.TXT")

sw.WriteLine("Mike Jones") 'Name

sw.WriteLine(9.35) 'Wage

sw.WriteLine(35) Hours worked

sw.WriteLine("John Smith")

sw.WriteLine(10.75)sw.WriteLine(33)

sw.Close()

End Sub

File: PAYROLL.TXTMike Jones

9.35

35John Smith

10.75

33Adding Items to a Sequential File

1.Execute the statement

Dimsw As IO.StreamWriter= IO.File.AppendText(filespec)

wheresw is a variable name andfilespec identifies the file.2.Place data into the file with the WriteLine method.

3.After all the data have been recorded into the file, close the file with the statement

sw.Close()


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Week 5: Chapter 4: Decisions (If Blocks/ Select Case Blocks)

5.1 - If blocks

5.2 - Select Case blocks

Lesson 1: if blocksLearning outcomes: be able to know

- how to write a code with condition using if clause or else if clause

Example 1: Form

Example 1: CodePrivate SubbtnFindLarger_Click(...) _HandlesbtnFindLarger.Click

Dimnum1, num2, largerNum As Double

num1 = CDbl(txtFirstNum.Text)

num2 = CDbl(txtSecondNum.Text)

Ifnum1 > num2 Then

largerNum = num1

txtFirstNum

txtSecondNum

txtResult


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Else

largerNum = num2

End If

txtResult.Text = "The larger number is " & largerNum

End Sub

Example 1: Output

Example 2: Form

Example 2: Partial CodeIfcosts = revenue Then

txtResult.Text = "Break even"

Else

Ifcosts < revenue Then

profit = revenue - costs

txtResult.Text = "Profit is " & _

FormatCurrency(profit) & "."

Else

loss = costs - revenue

txtResult.Text = "Loss is " & _


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FormatCurrency(loss) & "."

End If

End sub

Example 2: Output

Example:Grade Computation If Score>=90 and Attendance=100

grade=A

If Score>=90 and Attendance=80 and =90

grade=B

Otherwise

grade=C

Example 2: Partial CodeDimscore, attendance As Double

score = CDbl(txtScore.Text)

attendance = CDbl(txtAttendance.Text)


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Ifscore >= 90 Then

Ifattendance = 100 Then

txtGrade.Text = "A"

Else

txtGrade.Text = "B"

End IfElseIfscore >= 80 And attendance >= 90 Then

txtGrade.Text = "B"

Else

txtGrade.Text = "F"

End If

Lesson 2 : select case

Learning outcomes:

- be able to know how to write a code using select case

Example 1: Form

Example 1: CodePrivate SubbtnEvaluate_Click(...) _

Handles btnEvaluate.Click

Dim position As Integer= CInt(txtPosition.Text)

Select Caseposition

Case1

txtOutcome.Text = "Win"Case2

txtOutcome.Text = "Place"

Case3

txtOutcome.Text = "Show"

Case4, 5

txtOutcome.Text = "You almost placed in the money."

Case Else

txtPosition

txtOutcome


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txtBox.Text = "Out of the money."

End Select

End Sub

Example 1: Output


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Week 6: Chapter 9: Additional Controls and Objects (List

Boxes/ Combo Boxes)

- 9.1 List Boxes, Combo Boxes

Lesson 1: List Boxes, Combo BoxesLearning outcomes:

- be able to know how to use :

- List Box Control

- Combo Box Control

Example 1: Form

Example 1: Code

Private Sub lstOxys_SelectedIndexChanged(...) _HandleslstOxys.SelectedIndexChanged

txtSelected.Text = CStr(lstOxys.SelectedItem)

End Sub

Private SubbtnAdd_Click(...) Handles btnAdd.Click

Dimitem As String

item = InputBox("Item to Add:")

lstOxys.Items.Add(item)

End Sub

Private SublstOxys_DoubleClick(...) _

HandleslstOxys.DoubleClick

lstOxys.Items.RemoveAt(lstOxys.SelectedIndex)txtSelected.Clear()

End Sub

Lesson 2: The Combo Box Control

Example 2Private SubbtnDisplay_Click(...) _

HandlesbtnDisplay.Click

txtSelected

lstOxys


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txtDisplay.Text = cboTitle.Text & " " & txtName.Text

End Sub

cboTitle

txtDisplay

txtDisplay


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Week 7: Chapter 5: General Procedures (Sub Procedures)

5.1 Sub Procedures

Lesson 1: sub procedure

Learning outcomes: be able to :

Compare function procedure with sub procedures

Know the difference between bassing by value and by reference

general syntaxSubProcedureName()

statements

End Sub

Example1:

Private SubButton1_Click() Handles Button1.Click

lstBox.Items.Clear()

ExplainPurpose()

lstBox.Items.Add("")

End Sub

SubExplainPurpose()

lstBox.Items.Add("Program displays a sentence")

lstBox.Items.Add("identifying a sum.")

End Sub

Passing by Value and by reference

ExamplePublic SubbtnOne_Click (...) Handles_

btnOne.Click

Dimn AsDouble= 4

Triple(n)

txtBox.Text = CStr(n)

End Sub

Sub Triple(By Val num As Double)

num = 3 * num

End Sub

Output: 4

Same Example: n numPublic SubbtnOne_Click (...) Handles_


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btnOne.Click

Dimnum As Double= 4

Triple(num)

txtBox.Text = CStr(num)

End Sub

Sub Triple(By Val num As Double)

num = 3 * num

End Sub

Output: 4

Passing by Reference

ExamplePublic SubbtnOne_Click (...) Handles_

btnOne.Click

Dimnum As Double= 4

Triple(num)

txtBox.Text = CStr(num)

End Sub

Sub Triple(ByRef num As Double)

num = 3 * num

End Sub

Output: 12

Example: num n

Private SubbtnOne_Click(...) Handles_

btnOne_Click

Dimn As Double= 4

Triple(n)

txtBox.Text = CStr(n)

End Sub

Sub Triple(ByRef num As Double)

num = 3 * num

End Sub

Output: 12


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Week 8: Chapter 5: General Procedure (Function

Procedures)

Lesson 1: 5.3 Function Procedures

Learning outcomes: be able to : Compare function procedure with sub procedures

Syntax:FunctionFunctionName(By Val var1 As Type1, _

By Valvar2 As Type2, _

) As dataType

statement(s)

Returnexpression

End Function

Example: Form

Example: CodePrivate SubbtnDetermine_Click(...) _

HandlesbtnDetermine.Click

Dimname As String

name = txtFullName.Text

txtFirstName.Text = FirstName(name)

End Sub

FunctionFirstName(By Valname As String) As String

DimfirstSpace As Integer

firstSpace = name.IndexOf(" ")

Returnname.Substring(0, firstSpace)

End Function


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Example2: Form

Example: Code

Private SubbtnCalculate_Click(...) _HandlesbtnCalculate.Click

Dima, b As Double

a = CDbl(txtSideOne.Text)

b = CDbl(txtSideTwo.Text)

txtHyp.Text = CStr(Hypotenuse(a, b))

End Sub

FunctionHypotenuse(By Vala As Double, _

By Valb As Double) As Double

ReturnMath.Sqrt(a ^ 2 + b ^ 2)

End Function


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Week 9: Chapter 6: Repetition (Loops) 6.1 Do Loops

6.2 Processing Lists of Data with Do

Loops

6.3 For...Next Loops

Lesson 1: 6.1 Do Loops

6.2 Processing Lists of Data with Do

Loops

Learning outcomes:- Be able to know how to Write repetition statements using do loops

Do Loop Syntax:Do Whileconditionstatement(s)

Loop

Pseudocode and Flow Chart for a Do Loop

Example 1:Private SubbtnDisplay_Click(...) _

HandlesbtnDisplay.Click

'Display the numbers from 1 to 7

Dimnum As Integer= 1


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Do Whilenum


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Lesson 2: 6.2 Processing Lists of Data with Do Loops

Peek Method

Counters and Accumulators

Peek Method

Example 1: Display the Total Contents of a File (see page 266)Dimsr As IO.StreamReader = _

IO.File.OpenText("PHONE.TXT")

lstNumbers.Items.Clear()

Do Whilesr.Peek -1

name = sr.ReadLine

phoneNum = sr.ReadLine

lstNumbers.Items.Add(name & " "_

& phoneNum)

Loop

sr.Close()

Example 2: Form

Example 2: Partial CodeDimname, phoneNum As string

Dimsr As IO.StreamReader= _

IO.File.OpenText(PHONE.TXT)

Do While(name txtName.Text) And(sr.Peek -1)

name = sr.ReadLine

phoneNum = sr.ReadLineLoop

If(name = txtName.text) Then

txtNumber.Text = name & & phoneNum

Else

txtNumber.Text = name not found.

End If

sr.Close()


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Counters and AccumulatorsFile COINS.TXT

Example 3: Partial CodeDimnumCoins As Integer= 0

Dimsum As Integer= 0

Dimcoin As String

Do Whilesr.Peek -1

coin = sr.ReadLine

numCoins += 1

sum += CDbl(coin)

Loop

Lesson 3: 6.3 ForNext Loops

ForNext Loop Syntax

Example 1: CodeDimpop as Double= 300000

DimfmtStr As String= "{0,4}{1,12:N0}"

Foryr As Integer= 2008To2012

lstPop.Items.Add(String.Format( fmtStr, yr, pop)

pop += 0.03 * pop

Next


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Example 1: Output

Example2:

Fori As Integer= 1 To2

Forj As Integer = 1 To3

lstBox.Items.Add(i & * " & j & = " & i * j)

NextNext


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Week10: Chapter 10: Database Management and SQL10.1 An Introduction to Databases

10.2 Relational Databases and SQL

Lesson 1:10.1 An Introduction to Databases

Learning outcomes:

Develop database applications to access a database with a data table

Sample TableCities Table

Sample TableCountries Table


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Add Connection Dialog Box

Database Explorer Window after Connection to MEGACITIES.MDB


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Connecting with a DataTableDimdt As NewDataTable()

DimconnStr As String= _

"Provider=Microsoft.Jet.OLEDB.4.0;" & _

"Data Source=MEGACITIES.MDB"

DimsqlStr As String= "SELECT * FROM Cities"DimdataAdapter As New_

OleDb.OleDbDataAdapter(sqlStr, connStr)

dataAdapter.Fill(dt)

dataAdapter.Dispose()

Example 1: Form

Example 1: Partial CodeDimdt As NewDataTable()

DimrowIndex As Integer= 0

Private SubfrmCities_Load(...) HandlesMyBase.Load

Dimdt As NewDataTable()

DimconnStr As String= _

"Provider=Microsoft.Jet.OLEDB.4.0;" & _


DimsqlStr As String= "SELECT * FROM Cities"

DimdataAdapter As New_

OleDb.OleDbDataAdapter(sqlStr, connStr)



UpdateTextBoxes()

End Sub

SubUpdateTextBoxes()

'Display contents of row specified by rowIndex variable

txtCity.Text = CStr(dt.Rows(rowIndex)("city"))

txtCountry.Text = CStr(dt.Rows(rowIndex)("country"))


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txtPop2005.Text = CStr(dt.Rows(rowIndex)("pop2005"))

txtPop2015.Text = CStr(dt.Rows(rowIndex)("pop2015"))

End Sub

Private SubbtnNext_Click(...) HandlesbtnNext.Click

'Show the next record if current one is not the last

If (rowIndex < dt.Rows.Count - 1) Then

rowIndex += 1 'Increase rowIndex by 1

UpdateTextBoxes()

End If

End Sub

Private SubbtnPrevious_Click(...) HandlesbtnPrevious.Click

'Show previous record if current one is not the first

If(rowIndex > 0) Then

rowIndex = rowIndex - 1

UpdateTextBoxes()

End If

End Sub

Private SubbtnFind_Click(...) HandlesbtnFind.Click

DimcityName As String

DimcityFound As Boolean= False

cityName=InputBox("Enter name of city to search for.")

Fori As Integer= 0 To(dt.Rows.Count - 1)

IfCStr(dt.Rows(i)("city")) = cityName Then

cityFound = True

rowIndex = i

UpdateTextBoxes()

End If

Next

If(NotcityFound) Then

MessageBox.Show("Cannot find requested city")

End If

End Sub


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Example 1: Output

Example 2: Form

Example 2: CodePrivate SubbtnShow_Click(...)HandlesbtnShow.Click

DimfmtStr As String="{0,-15}{1,-10}{2,7:N1}{3,7:N1}{4,7:P0}"

DimpercentIncrease As Double

(Six statements of boi lerplate)

lstDisplay.Items.Add(String.Format(fmtStr, "CITY", _

"COUNTRY", "2005", "2015", "INCR."))

Fori As Integer= 0 Todt.Rows.Count - 1

percentIncrease = (CDbl(dt.Rows(i)("pop2015")) - _

CDbl(dt.Rows(i)("pop2005"))) / CDbl(dt.Rows(i)("pop2005"))

lstDisplay.Items.Add(String.Format(fmtStr, dt.Rows(i)(0), _

dt.Rows(i)(1),dt.Rows(i)(2),dt.Rows(i)(3),percentIncrease))

Next

End Sub


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Example 2: Output


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Week 11: Chapter 10: Database Management (Binding a

listbox to a datatable)

Learning outcomes:

Develop database applications to access a database with a listbox

Lesson 1: binding a listbox to a datatable

The following statement binds a list box to a data table:

lstBox.DataSource = dtThe contents of a specified field can be displayed in the list box by:

lstBox.DisplayMember = "country"

Example: Form

Display the list of countries. When the user clicks on a country, its monetary unit should

be displayed.

Example : CodeDimdt As NewDataTable()

Private SubfrmCountries_Load(...) Handles MyBase.Load(Last five statements of boilerplate)

lstCountries.DataSource = dt 'Bind list box

lstCountries.DisplayMember = "country"

End Sub

Private SublstCountries_SelectedIndexChanged(...) _

HandleslstCountries.SelectedIndexChanged

txtMonetaryUnit.Text = _CStr(dt.Rows(lstCountries.SelectedIndex)("monetaryUnit")

End Sub


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Example: Output


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Week 12: Chapter 10: Database Management (Setting

Criteria/ Tables Join)

-

Relational database and SQL

Learning outcomes: be able to know how to:- Show just the records that meet certain criteria

- Join between two tables

Lesson 1: Four SQL Requests

1- Show the records of a table in a specified orderSELECT * FROM Table1 ORDER BYfield1 ASC

orSELECT * FROM Table1 ORDER BYfield1 DESC

2- Show just the records that meet certain criteriaSELECT * FROM Table1 WHERE criteria

3- Make available just some of the fieldsSELECTfield1,field2, . . .,fieldN FROM Table1 WHERE criteria

4- Join the tables togetherSELECT * FROM Table1 INNER JOIN Table2 ONforeign field =primary field

WHERE criteria

Examples :

1- SELECT * FROM Countries WHERE country LIKE 'I%' ORDER BY pop2005

ASC

2- Show the records from Cities in alphabetical order based on the name of the city

with

SELECT * FROM Cities ORDER BY city ASC


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3- Show the records from Cities in alphabetical order based first on the name of the

country and, within each country group, the name of the city with

SELECT * FROM Cities ORDER BY country, city ASC

4- Show the records from Cities in descending order based on the projected 2015population, using

SELECT * FROM Cities ORDER BY pop2015 DESC

5- Show the records for the Cities in India with

SELECT * FROM Cities WHERE country = 'India'

6- Show the records from Cities whose 2015 population is projected to be at least 20

million, as in

SELECT * FROM Cities WHERE pop2015 >= 20

7-

Show the records from Cities whose name begins with the letter "D", with

SELECT * FROM Cities WHERE city Like 'D%'

8- Show the records from the joined table in descending order of the populations oftheir countries, using

SELECT * FROM Cities INNER JOIN Countries ON Cities.country =

Countries.country ORDER BY Countries.pop2005 DESC

9- Show the records from the joined table whose monetary unit has "u" as its second

letter with

SELECT * FROM Cities INNER JOIN Countries ON Cities.country =

Countries.country WHERE monetaryUnit Like '_u%'


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10- Make available just the city and country fields of the table Cities, using

SELECT city, country FROM Cities

11- Make available just the city and monetaryUnit fields of the joined table, as in

SELECT city, monetaryUnit FROM Cities INNER JOIN Countries ON Cities.country =

Countries.country


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Week 13: Chapter 10: Database Management (Data Grid

View/ Changing contents)

- The DataGridView control- Changing the content of a database

Learning outcomes:

- Develop database applications to access a database with a data table, datagridview

, and change the contents of a database

Lesson 1: The DataGridView control

Example1: Form

Example1: CodePrivate SubfrmCities_Load(...) Handles MyBase.Load

UpdateGrid( "Select * From Cities")

End SubPrivate SubbtnOrderbyPop_Click(...) HandlesbtnOrderbyPop.Click

UpdateGrid ( "Select * From Cities Order By pop2005 ASC")

End Sub

Private SubbtnShowMonUnit_Click(...) _HandlesbtnShowMonUnit.Click

UpdateGrid( "SELECT city, Cities.country, "& _

"Cities.pop2005, monetaryUnit " & _"FROM Cities INNER JOIN Countries "& _

"ON Cities.country=Countries.country "& _

"ORDER BY city ASC")End Sub


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SubUpdateGrid(By ValsqlStr As String )

Dimdt As NewDataTable()

DimconnStr As String= "Provider=Microsoft.Jet.OLEDB.4.0;" & _"Data Source = MEGACITIES.MDB"

DimdataAdapter As NewOleDb.OleDbDataAdapter(sqlStr, connStr)


dataAdapter.Dispose()dgvDisplay.DataSource = dt

End Sub

Example1: Output

Example 2: Form

Example 2: CodePrivate SubbtnFindCities_Click(...) _

HandlesbtnFindCities.Click

UpdateGrid( "SELECT city FROM Cities WHERE" & _"country = '"& txtCountry.Text & _

"' ORDER BY city ASC")


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End Sub

SubUpdateGrid( By ValsqlStr As String)

(Boilerplate, except for Dim sqlStr statement)Ifdt.Rows.Count = 0 Then

MessageBox.Show( "No cities from that country "& "in the database")

Else

dgvDisplay.DataSource = dtEnd If

End Sub

Example 2: Output

Lesson 2: Changing the Contents of a Database


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Example 3: Form

Example 3: Partial CodeDimconnStr As String= "Provider=Microsoft.Jet.OLEDB.4.0;"& _


DimsqlStr As String= "SELECT * FROM Cities"Dimdt As NewDataTable()

Private SubbtnLoad_Click(...) HandlesbtnLoad.Click

dt.Clear()

DimdataAdapter As NewOleDb.OleDbDataAdapter(sqlStr, connStr)

dataAdapter.Fill(dt)dataAdapter.Dispose()

dgvDisplay.DataSource = dt

End SubPrivate SubbtnSave_Click(...) HandlesbtnSave.Click

Dimchanges As Integer

DimdataAdapter As NewOleDb.OleDbDataAdapter(sqlStr, connStr)DimcommandBuilder As New_

OleDb.OleDbCommandBuilder(dataAdapter)

changes = dataAdapter.Update(dt)


Ifchanges > 0 ThenMessageBox.Show(changes & " changed rows.")

ElseMessageBox.Show ("No changes made.")

End If

End Sub


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Week 14 & 15: Chapter 10: SQL (insert, delete and update

sql statement)

Learning outcomes:

-

Write a program using insert sql statement- Develop applications with multiple forms

- Design, create, test and debug fully functioning programs using the new VisualBasic.Net language

Lesson 1: insert, delete sql statement

INSERT INTO table_name (column1, column2, column3,...)

VALUES (value1, value2, value3,...)

Delete from table name where condition

Example: form

Example: codePublicClassForm1

Dimconn AsString= "Provider=Microsoft.Jet.OLEDB.4.0;Data Source="&Application.StartupPath & "\MEGACITIES.MDB"

PrivateSubForm1_Load(By Valsender AsSystem.Object, By Vale As

System.EventArgs) HandlesMyBase.LoadupdateDataGrid()

EndSub

PrivateSubbtnInsert_Click(By Valsender AsSystem.Object, By Vale As

System.EventArgs) HandlesbtnInsert.Click


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Dimdt AsNewDataTable

Dimsql AsString= "Insert into cities values ('"& txtCity.Text & "','"&

txtCountry.Text & "','"& txtPop2005.Text & "','"& txtPop2015.Text & "')"Dimadapter AsNewOleDb.OleDbDataAdapter(sql, conn)

adapter.Fill(dt)

updateDataGrid()

EndSub

SubupdateDataGrid()

Dimdt AsNewDataTable'Dim conn As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" &

Application.StartupPath & "\MEGACITIES.MDB"

Dimsql AsString= "select * from cities"

Dimadapter AsNewOleDb.OleDbDataAdapter(sql, conn)adapter.Fill(dt)

DataGridView1.DataSource = dt

EndSub

PrivateSubButton2_Click(By Valsender AsSystem.Object, By Vale As

System.EventArgs) HandlesButton2.Click

Dimdt AsNewDataTable

Dimsql AsString= "delete from cities where city='"& txtCity.Text & "'"

Dimadapter AsNewOleDb.OleDbDataAdapter(sql, conn)adapter.Fill(dt)

updateDataGrid()

EndSub

PrivateSubDataGridView1_CellContentClick(By Valsender AsSystem.Object, By

Vale AsSystem.Windows.Forms.DataGridViewCellEventArgs) HandlesDataGridView1.CellContentClick

'txtCity.Text = DataGridView1.CurrentRow.Cells(0).Value.ToString()

'txtCountry.Text = DataGridView1.CurrentRow.Cells(1).Value.ToString()'txtPop2005.Text = DataGridView1.CurrentRow.Cells(2).Value.ToString()

'txtPop2015.Text = DataGridView1.CurrentRow.Cells(3).Value.ToString()

EndSub

PrivateSubDataGridView1_RowHeaderMouseDoubleClick(By Valsender AsObject,By Vale AsSystem.Windows.Forms.DataGridViewCellMouseEventArgs) Handles

DataGridView1.RowHeaderMouseClick

txtCity.Text = DataGridView1.CurrentRow.Cells(0).Value.ToString()txtCountry.Text = DataGridView1.CurrentRow.Cells(1).Value.ToString()

txtPop2005.Text = DataGridView1.CurrentRow.Cells(2).Value.ToString()

txtPop2015.Text = DataGridView1.CurrentRow.Cells(3).Value.ToString()EndSub

Documents

MIS 312 Lab Manual