how to display pdf file in asp.net c# : Copy paste text pdf Library control component .net web page asp.net mvc Microsoft%20Access%20Vba%20Programming%20For%20The%20Absolute%20Beginner%20Second%20Edition28-part2001

265
Chapter 9  •  Database Programming with ADO
Control
Property
Property Value
Form
Name
About
Caption
Chapter 9
Record Selectors
No
Navigation Buttons
No
Dividing Lines
No
Image
Name
imgBanner
Picture
banner.jpg(located on CD)
Size Mode
Stretch
Image
Name
imgSkeleton
Picture
skeleton.jpg(located on CD)
Size Mode
Stretch
Label
Name
lblAbout
Caption
A Choose My Adventure book
Command Button
Name
cmdOK
Caption
OK
Control
Property
Property Value
Form
Name
Main
Caption
Chapter 9
Record Selectors
No
Navigation Buttons
No
Dividing Lines
No
Image
Name
imgBanner
Picture
banner.jpg (located on CD)
Size Mode
Stretch
T
AB LE
9.7     C
ONT R OLS A ND
P
ROP E RT IE S O F T H E
M
AI N
F
OR M
T
AB LE
9.6     C
ONT RO LS AN D
P
RO P E RT IE S OF T H E
A
BOUT
F
OR M
(continues)
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266
All of the code required to implement the 
Choose My Adventure Main
form follows.
Option Compare Database
Option Explicit
‘Declare form-level Connection object variable.
Dim localConnection As ADODB.Connection
Access VBA Programming for the Absolute Beginner, Second Edition
Control
Property
Property Value
Text Box
Name
txtPage
Enter Key Behavior
New Line in Field
Command Button
Name
cmdRead
Caption
Start Over
Command Button
Name
cmdAbout
Caption
About My Adventure
Command Button
Name
cmdQuit
Caption
Quit My Adventure
Command Button
Name
cmdChoose
Caption
Choose Adventure
Frame
Name
fraQuestionAndOutcomes
Frame Label
Name
lblQuestion
Option Button
Name
optOption1
Option Button Label
Name
lblOption1
Option Button
Name
optOption2
Option Button Label
Name
lblOption2
Option Button
Name
optOption3
Option Button Label
Name
lblOption3
T
ABL E
9. 7     C
ONT RO LS AN D
P
RO P E RTI E S
OF T H E
M
AI N
F
OR M
(
CON TI NU ED
)
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Private Sub cmdAbout_Click()
‘Show the About form.
DoCmd.OpenForm “About”
End Sub
Private Sub cmdChoose_Click()
‘ Use the assigned option button value to get
‘ the next page in the book.
GetPage Me.fraQuestionAndOutcomes.Value
End Sub
Private Sub cmdQuit_Click()
‘Quit the application.
DoCmd.Quit
End Sub
Private Sub cmdRead_Click()
MsgBox “Welcome to The Night Before Halloween, “ & _
“ a Choose My Adventure book by Michael Vine.”, _
vbOKOnly, “Chapter 9 - Database Programming with ADO”
Me.cmdRead.Caption = “Start Over”
ResetForm
Me.txtPage.Value = “”
Me.lblQuestion.Caption = “”
Me.cmdChoose.Visible = False
‘Call the GetPage procedure to display the
‘first page in the book.
GetPage 1
End Sub
267
Chapter 9  •  Database Programming with ADO
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268
Private Sub Form_Load()
‘Perform some initial setup.
ResetForm
Me.txtPage.Value = “”
Me.lblQuestion.Caption = “”
Me.cmdChoose.Visible = False
Me.cmdRead.Caption = “Read My Adventure”
‘Assign the current Access connection to my
‘Connection object variable.
Set localConnection = CurrentProject.AccessConnection
End Sub
Private Sub Form_Unload(Cancel As Integer)
On Error GoTo ErrorClosing
‘Close the connection.
localConnection.Close
Exit Sub
ErrorClosing:
‘Do nothing!
End Sub
Public Sub GetQuestion(pageID As Integer)
Dim rsQuestion As New ADODB.Recordset
Dim sql As String
On Error GoTo BookError
Access VBA Programming for the Absolute Beginner, Second Edition
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‘Using the incoming pageID, get and display 
‘the associated question (if one exists).
‘This procedure calls the GetOutcome procedure.
sql = “select * from Questions where PageID = “ & pageID
rsQuestion.Open sql, localConnection, adOpenForwardOnly, _
adLockReadOnly, adCmdText
If rsQuestion.EOF = False Then
Me.lblQuestion.Caption = rsQuestion!Question
GetOutcome rsQuestion!questionID
Else
ResetForm
End If
rsQuestion.Close
Exit Sub
BookError:
ErrorMessage
End Sub
Public Sub GetOutcome(questionID As Integer)
Dim rsOutcomes As New ADODB.Recordset
Dim x As Integer
Dim sql As String
On Error GoTo BookError
269
Chapter 9  •  Database Programming with ADO
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270
‘Using the incoming questionID, get all possible outcomes
‘for the associated question.
sql = “select * from Outcomes where QuestionID = “ & _
questionID
rsOutcomes.Open sql, localConnection, adOpenForwardOnly, _
adLockReadOnly, adCmdText
ResetForm
If rsOutcomes.EOF = False Then
Me.lblOption1.Visible = True
Me.optOption1.Visible = True
Me.lblOption1.Caption = rsOutcomes!Outcome
Me.optOption1.OptionValue = rsOutcomes!GoToPage
rsOutcomes.MoveNext
End If
If rsOutcomes.EOF = False Then
Me.lblOption2.Visible = True
Me.optOption2.Visible = True
Me.lblOption2.Caption = rsOutcomes!Outcome
Me.optOption2.OptionValue = rsOutcomes!GoToPage
rsOutcomes.MoveNext
End If
If rsOutcomes.EOF = False Then
Me.lblOption3.Visible = True
Me.optOption3.Visible = True
Me.lblOption3.Caption = rsOutcomes!Outcome
Me.optOption3.OptionValue = rsOutcomes!GoToPage
End If
Access VBA Programming for the Absolute Beginner, Second Edition
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rsOutcomes.Close
Exit Sub
BookError:
ErrorMessage
End Sub
Public Function AnyMoreQuestions(pageID As Integer) As Boolean
Dim rsAnyMoreQuestions As New ADODB.Recordset
Dim returnValue As Boolean
Dim sql As String
On Error GoTo BookError
‘This procedure is called by the GetPage procedure.
‘It checks to see if there are any more questions
‘for the current page passed in.
sql = “select * from Questions where PageID = “ & pageID
rsAnyMoreQuestions.Open sql, localConnection, _
adOpenForwardOnly, adLockReadOnly, adCmdText
If rsAnyMoreQuestions.EOF = False Then
returnValue = True  ‘There are questions
Else
returnValue = False ‘There are no questions
End If
rsAnyMoreQuestions.Close
AnyMoreQuestions = returnValue
Exit Function
271
Chapter 9  •  Database Programming with ADO
272
BookError:
ErrorMessage
End Function
Public Sub GetPage(pageID As Integer)
Dim rsPage As New ADODB.Recordset
Dim sql As String
On Error GoTo BookError
‘Gets and displays the requested page. Calls GetQuestion
‘and AnyMoreQuestions procedures.
sql = “select * from Pages where PageID = “ & pageID
rsPage.Open sql, localConnection, adOpenForwardOnly, _
adLockReadOnly, adCmdText
If rsPage.EOF = False Then
Me.txtPage.Visible = True
Me.txtPage.Value = rsPage!Content
End If
GetQuestion rsPage!pageID
Me.txtPage.SetFocus
If AnyMoreQuestions(rsPage!pageID) = False Then
Me.cmdChoose.Visible = False
Me.lblQuestion.Caption = “”
Else
Access VBA Programming for the Absolute Beginner, Second Edition
Me.cmdChoose.Visible = True
End If
rsPage.Close
Exit Sub
BookError:
ErrorMessage
End Sub
Public Sub ErrorMessage()
‘A general error bin called by each error handler
‘in the form class.
MsgBox “There was an error reading the book. “ & Chr(13) _
& Err.Number & “, “ & Err.Description
End Sub
Public Sub ResetForm()
Me.lblOption1.Visible = False
Me.lblOption2.Visible = False
Me.lblOption3.Visible = False
Me.optOption1.Visible = False
Me.optOption2.Visible = False
Me.optOption3.Visible = False
End Sub
273
Chapter 9  •  Database Programming with ADO
274
Chapter Summary
• ADO is Microsoft’s popular programming vehicle for managing data in databases
such as Microsoft Access, SQL Server, and non-Microsoft relational databases such as
Oracle.
• ADO’s application programming interface (API) is made up of many objects such as
Connection
and 
Recordset
and collections such as the 
Fields
collection.
• It is good programming practice to use error handling whenever accessing a database
through ADO.
• Connections to databases are established through ADO’s 
Connection
object.
• A result set is the set of rows retrieved by a command or SQL query.
• The 
Recordset
object is used to work with rows in a database table.
• Database locking prevents multiple users (or processes) from updating the same row
at the same time.
• A cursor is a structure that names and manages a storage area in memory. Program-
mers use cursors to point to one row of data at a time in a result set.
• The 
Recordset
object methods 
MoveFirst
MoveLast
MoveNext
, and 
MovePrevious
are
used to browse through records in a result set.
• Use the 
Recordset
object properties 
AbsolutePosition
and 
RecordCount
to determine 
if the cursor position is at the end or beginning of a recordset.
• The 
Recordset
object method 
Update
is synonymous with saving a record.
• The 
Recordset
object method 
AddNew
is used to add a row to a table.
• The 
Recordset
object method 
Delete
is used to delete a row from a table.
Access VBA Programming for the Absolute Beginner, Second Edition
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