by Kripz (http://www.thesysteminfo.com) (1 Submission)
Category: Databases/Data Access/DAO/ADO
Difficulty: Intermediate
Date Added: Wed 3rd February 2021
Rating: 
(2 Votes)
ADO Example: To Coneection Visual Basic to Any Database(MS Access[mdb], SQL Server etc.,)
Assumes
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VBcodersPrivate Sub Command1_Click()
'Define the three objects that we need,
' A Connection Object - connects to our data source
' A Command Object - defines what data to get from the data source
' A RecordSet Object - stores the data we get from our data source
Dim conConnection As New ADODB.Connection
Dim cmdCommand As New ADODB.Command
Dim rstRecordSet As New ADODB.Recordset
'Defines the connection string for the Connection. Here we have used fields
'Provider, Data Source and Mode to assign values to the properties
' conConnection.Provider and conConnection.Mode
conConnection.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & _
App.Path & "\" & "database.mdb;Mode=Read|Write"
'Define the location of the cursor engine, in this case we are opening an Access database
'and adUseClient is our only choice.
conConnection.CursorLocation = adUseClient
'Opens our connection using the password "Admin" to access the database. If there was no password
'protection on the database this field could be left out.
conConnection.Open
'Defines our command object
' .ActiveConnection tells the command to use our newly created command object.
' .CommandText tells the command how to get the data, in this case the command
' will evaluate the text as an SQL string and we will return all
' records from a table called tabTestTable
' .CommandType tells the command to evaluate the .CommandText property as an SQL string.
With cmdCommand
.ActiveConnection = conConnection
.CommandText = "SELECT * FROM tabTestTable;"
.CommandType = adCmdText
End With
'Defines our RecordSet object.
' .CursorType sets a static cursor, the only choice for a client side cursor
' .CursorLocation sets a client side cursor, the only choice for an Access database
' .LockType sets an optimistic lock type
' .Open executes the cmdCommand object against the data source and stores the
' returned records in our RecordSet object.
With rstRecordSet
.CursorType = adOpenStatic
.CursorLocation = adUseClient
.LockType = adLockOptimistic
.Open cmdCommand
End With
'Firstly test to see if any records have been returned, if some have been returned then
'the .EOF property of the RecordSet will be false, if none have been returned then the
'property will be true.
If rstRecordSet.EOF = False Then
'Move to the first record
rstRecordSet.MoveFirst
'Lets move through the records one at a time until we reach the last record
'and print out the values of each field
Do
'Access the field values using the fields collection and print them to a message box.
'In this case I do not know what you might call the columns in your database so this
'is the safest way to do it. If I did know the names of the columns in your table
'and they were called "Column1" and "Column2" I could reference their values using:
' rstRecordSet!Column1
' rstRecordSet!Column2
MsgBox "Record " & rstRecordSet.AbsolutePosition & " " & _
rstRecordSet.Fields(0).Name & "=" & rstRecordSet.Fields(0) & " " & _
rstRecordSet.Fields(1).Name & "=" & rstRecordSet.Fields(1)
'Move to the next record
rstRecordSet.MoveNext
Loop Until rstRecordSet.EOF = True
'Add a new record
With rstRecordSet
.AddNew
.Fields(0) = "New"
.Fields(1) = "Record"
.Update
End With
'Move back to the first record and delete it
rstRecordSet.MoveFirst
rstRecordSet.Delete
rstRecordSet.Update
'Close the recordset
rstRecordSet.Close
Else
MsgBox "No records were returned using the query " & cmdCommand.CommandText
End If
'Close the connection
conConnection.Close
'Release your variable references
Set conConnection = Nothing
Set cmdCommand = Nothing
Set rstRecordSet = Nothing
End Sub
