Computer Programming Concepts and Visual Basic David I. Schneider

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328 Computer Programming Concepts and Visual Basic Private Sub cmdAdd_Click() ‘Add a new record datCities.Recordset.AddNew ‘Data must be entered and a new record moved to End Sub Private Sub cmdDelete_Click () ‘Delete the currently displayed record datCities.Recordset.Delete ‘Move so that user sees deleted record disappear datCities.Recordset.MoveNext If datCities.Recordset.EOF Then datCities.Recordset.MovePrevious End If End Sub Object Property Setting Private Sub cmdSearch_Click() Dim strSearchFor As String, foundFlag As Boolean ‘Search for the city specified by the user strSearchFor = UCase(InputBox(“Name of city to find:”)) If Len(strSearchFor) > 0 Then datCities.Recordset.MoveFirst foundFlag = False frmDBMan Caption Database Management cmdAdd Caption Add cmdDelete Caption Delete cmdSearch Caption Search cmdQuit Caption Quit datCities Caption Large World Cities Database MEGACTY1.MDB Name Record Cities Source lblCity Caption City: txtCity Text (blank) Data datCities Source DataField City lblCountry Caption Country: txtCountry Text (blank) Data datCities Source DataField Country lblPop1995 Caption 1995 Population: txtPop1995 Text (blank) Data datCities Source DataField pop1995 lblPop2015 Caption 2015 Population: txtPop2015 Text (blank) Data datCities Source DataField pop2015
Do While (Not foundFlag) And (Not datCities.Recordset.EOF) If UCase(datCities.Recordset.Fields(“City”).Value) = strSearchFor Then foundFlag = True Else datCities.Recordset.MoveNext End If Loop If Not foundFlag Then MsgBox “Unable to locate requested city.”“Not Found” datCities.Recordset.MoveLast ‘move so that EOF is no longer true End If Else MsgBox “Must enter a city.”, ,“” End If End Sub Private Sub cmdQuit_Click () End End Sub Private Sub datCities_Validate(Action As Integer, Save As Integer) ‘Prevent a user from adding a city of population under 1 million Dim strMsg As String If Val(txtPop1995) < 1 Then If (Not datCities.Recordset.EOF) And (Not datCities.Recordset.BOF) Then strMsg = “We only allow cities having a population of ” & _ “at least one million.” MsgBox strMsg“City too small!” Action = 0 End If End If End Sub [Run, click the Search button, and enter New York.] COMMENTS 1. App.Path cannot be used when you set the DatabaseName property of a data control in the Properties window at design time. However, App.Path can be used in the Form_Load event procedure. For instance, if you add the lines Private Sub Form_Load() datCities.DatabaseName = App.Path & “\MEGACTY1.MDB” End Sub An Introduction to Databases 329
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Computer Programming Concepts and V
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CONTENTS SECTION 1: PROBLEM SOLVING
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13.3 WEB PAGE PROGRAMMING WITH VBSC
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S E C T I O N 1 PROBLEM SOLVING
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4 Computer Programming Concepts and
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10 Computer Programming Concepts an
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S E C T I O N 2 FUNDAMENTALS OF PRO
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3.1 SUB PROCEDURES, PART I Structur
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The second task performed by the ad
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‘The density (number of people pe
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"Hawaii", 1184000, 6471 "Alaska", 6
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dure by just using the variable in
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Call CalculateSum(x, y, s) Call Dis
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■ FORM-LEVEL VARIABLES Visual Bas
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3. In Appendix D, the section “St
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Private Sub cmdDetermine_Click() Di
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Private Sub cmdCompute_Click() Dim
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preceded with the word ByVal. Built
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It is clear from the hierarchy char
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The meaningful procedure names, alo
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FIGURE 3-9 Sample Run for Programmi
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4.1 RELATIONAL AND LOGICAL OPERATOR
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(a) (2 < n) And (n < 6) (b) (2 < n)
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SOLUTION: In the following program,
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The Else part of an If block can be
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picTax.Cls picTax.Print “Your FIC
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Case 4, 5 picOutcome.Print “You a
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EXAMPLE 3 The following program use
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Case Else picResult.Print “The st
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4. The items in the value list must
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The hierarchy chart in Figure 4-4 s
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‘Program to compute employees’
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Private Function TaxMarried(adjPay
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and tells us whether the food meets
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S E C T I O N 5 REPETITION
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132 Computer Programming Concepts a
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S E C T I O N 6 ARRAYS
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S E C T I O N 7 SEQUENTIAL FILES
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S E C T I O N 8 RANDOM-ACCESS FILES
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S E C T I O N 9 THE GRAPHICAL DISPL
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Page 295 and 296: 10.1 LIST BOXES AND COMBO BOXES The
Page 297 and 298: Private Sub cmdAdd_Click() Dim item
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Page 301 and 302: Private Sub cmdDisplay_Click() picF
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Page 307 and 308: hsbBar.Value changes accordingly. T
Page 309 and 310: THE SHAPE CONTROL The shape control
Page 311 and 312: FIGURE 10-9 A Picture Created with
Page 313 and 314: Rows 9 ScrollBars 0 - flexScrollBar
Page 315 and 316: Private Sub cmdQuit_Click() End End
Page 317 and 318: Here, the menu bar contains two men
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Page 321 and 322: cedures that are available to all f
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Page 333 and 334: 9. Click on the down arrow to the r
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Page 351 and 352: Creating and Designing Databases 34
Page 353 and 354: 9. When all fields have been specif
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Page 357 and 358: TABLE 11.5(B) TABLE 11.5(C) course
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Page 365 and 366: Task Statement Assign a value to a
Page 367 and 368: EXAMPLE 1 and then an instance of t
Page 369 and 370: [Run, enter the data for a student
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Page 377 and 378: txtFinal.Text = “” picGrades.Pr
Page 379 and 380: ■ EVENTS In the previous section
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Next i End Sub Public Function Read
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Remove method. The number of object
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S E C T I O N 13 COMMUNICATING WITH
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A P P E N D I C E S
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APPENDIX C VISUAL BASIC STATEMENTS,
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CANCEL The Cancel property provides
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COLS and ROWS The Cols and Rows pro
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DEFINT, DEFLNG, DEFSNG, DEFDBL, DEF
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ENVIRON Visual Basic has an environ
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FONT.ITALIC or FONTITALIC These pro
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yields “1234.”, Format(1234000,
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the length of the string currently
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ISNUMERIC The value of the function
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Unlock statement is used to remove
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Focus Default Default Number First
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OR (Logical Operator) The logical e
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the same as in the original Dimensi
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SECOND The function Second extracts
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STRETCH When the Stretch property o
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UNLOCK The Unlock command is intend
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[COLOR]: Numbers written in base 16
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Appendix D 457
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466 Technology of the Internet D Da
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468 Technology of the Internet Rela
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470 Technology of the Internet 2. D
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SYSTEM REQUIREMENTS CD-ROM INSTRUCT
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Computer Programming Concepts and Visual Basic David I. Schneider

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