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ACCESS / ORACLE ADO Connection and Recordset


To Provide a Recordset Template
(view,execute,edit,Add new)
To Provide a Database Connection Template (ORACLE
and MS Access)

Original Author: Herman Ibrahim

Assumptions

Add Microsoft ActiveX Data Object 2.X library
into Project Reference.

Code

'Put This part in a module
'======================================
'Starrt of Module
'======================================
Option Explicit
Public Enum RSMethod
VIEW_RECORD = 0
EDIT_RECORD = 1
EXEC_SQL = 2
NEW_RECORD = 3
End Enum
Function dbConnection(strDatabaseType As String, strDBService As String, Optional strUserID As String, Optional strPassword As String) As ADODB.Connection

Dim objDB As New ADODB.Connection
Dim strConnectionString As String

If strDatabaseType = "ORACLE" Then
'Define ORACLE database connection string
strConnectionString = "Driver={Microsoft ODBC Driver for Oracle};ConnectString=" & strDBService & ";UID=" & strUserID & ";PWD=" & strPassword & ";"
ElseIf strDatabaseType = "MSACCESS" Then
'Define Microsoft Access database connection string
strConnectionString = "DBQ=" & strDBService
strConnectionString = "DRIVER={Microsoft Access Driver (*.mdb)}; " & strConnectionString
End If

With objDB
.Mode = adModeReadWrite ' connection mode ???
.ConnectionTimeout = 10 'Indicates how long to wait while establishing a connection before terminating the attempt and generating an error.
.CommandTimeout = 5 ' seconds given to execute any command
.CursorLocation = adUseClient ' use the appropriate cursor ???
.Open strConnectionString 'open the database connection

End With

Set dbConnection = objDB
End Function
Function CreateRecordSet(ByRef dbConn As ADODB.Connection, ByRef rs As ADODB.Recordset, ByVal method As RSMethod, Optional strSQL As String, Optional TableName As String) As ADODB.Recordset
' close the recordset first if it's open...
' otherwise an error will occured
'(open a recordset which is already opened...)
if rs.State=1 then
rs.close
end if
Select Case method
Case RSMethod.NEW_RECORD
rs.ActiveConnection = dbConn
rs.CursorType = adOpenKeyset
rs.LockType = adLockOptimistic
rs.CursorLocation = adUseServer
rs.Open TableName

Case RSMethod.EDIT_RECORD
rs.ActiveConnection = dbConn
rs.Source = strSQL
rs.CursorType = adOpenKeyset
rs.LockType = adLockOptimistic
rs.CursorLocation = adUseClient
rs.Open
' Debug.Print "SQL Statement in EDIT Mode (Createrecordset) : " & strSQL
' Debug.Print "Found " & rs.RecordCount & " records"

Case RSMethod.VIEW_RECORD

rs.ActiveConnection = dbConn 'dbConnection 'dbConn
rs.Source = strSQL
rs.CursorType = adOpenForwardOnly
rs.CursorLocation = adUseClient
rs.Open
' Debug.Print "Found " & rs.RecordCount & " records"
rs.ActiveConnection = Nothing

Case RSMethod.EXEC_SQL
Set rs = dbConn.Execute(strSQL)
End Select
Set CreateRecordSet = rs
End Function
'======================================
'End Of Module
'======================================
'=================================================
'======================================
'Sample of subroutines...
'======================================
Sub Add_New_Record()
Dim objRecSet As New ADODB.Recordset
Dim objConn As New ADODB.Connection
Dim strUserID As String
Dim strPassword As String
Dim strTableName As String
Dim strDBType As String
Dim strDBName As String

strTableName = "YOURTABLE"
strPassword = "YourPassword"
strUserID = "YourUserID"

If strDBType = "MSACCESS" Then
' strDBName is your Database Name
strDBName = App.Path & "YourAccessDB.mdb"

ElseIf strDBType = "ORACLE" Then
' strDBName is your Oracle Service Name
strDBName = "YOUR_ORACLE_SERVICE_NAME"
strTableName = strUserID & "." & strTableName
'Table name format ::> USERID.TABLENAME
Else
MsgBox "Database is other than ORACLE or Microsoft"
Exit Sub
End If

Set objConn = dbConnection(strDBType, strDBName, "userid", "password")
'send NEW_RECORD and strTableName as a part of parameters
Set objRecSet = CreateRecordSet(objConn, objRecSet, NEW_RECORD, , strTableName)

objConn.BeginTrans
With objRecSet
.AddNew
.Fields("FIELD1").Value = "your value1"
.Fields("FIELD2").Value = "your value2"
.Fields("FIELD3").Value = "your value3"
.Fields("FIELD4").Value = "your value4"
.Fields("FIELD5").Value = "your value5"
.Update
End With
If objConn.Errors.Count = 0 Then
objConn.CommitTrans
Else
objConn.RollbackTrans
End If

objRecSet.Close
objConn.Close
Set objRecSet = Nothing
Set objConn = Nothing
End Sub
Sub View_Record_Only()
Dim strSQL As String
Dim strDBName As String
Dim strDBType As String
Dim strUserID As String
Dim strPassword As String

Dim objRecSet As New ADODB.Recordset
Dim objConn As New ADODB.Connection

If strDBType = "MSACCESS" Then
' strDBName is your Database Name
strDBName = App.Path & "YourAccessDB.mdb"

ElseIf strDBType = "ORACLE" Then
' strDBName is your Oracle Service Name
strDBName = "YOUR_ORACLE_SERVICE_NAME"

Else
MsgBox "Database is other than ORACLE or Microsoft"
Exit Sub
End If

strPassword = "YourPassword"
strUserID = "YourUserID"
strSQL = "SELECT * from USER_TABLE"

Set objConn = dbConnection(strDBType, strDBName, "userid", "password")
'create a disconnected recordset
Set objRecSet = CreateRecordSet(objConn, objRecSet, VIEW_RECORD, strSQL)
objConn.Close
Set objConn = Nothing
'manipulate the recordset here.....
'manipulate the recordset here.....
'manipulate the recordset here.....
objRecSet.Close
Set objRecSet = Nothing
End Sub
Sub Edit_Existing_Record()
Dim objRecSet As New ADODB.Recordset
Dim objConn As New ADODB.Connection
Dim strUserID As String
Dim strPassword As String
Dim strSQL As String
Dim strDBType As String
Dim strDBName As String

strTableName = "YOURTABLE"
strPassword = "YourPassword"
strUserID = "YourUserID"

If strDBType = "MSACCESS" Then
' strDBName is your Database Name
strDBName = App.Path & "YourAccessDB.mdb"

ElseIf strDBType = "ORACLE" Then
' strDBName is your Oracle Service Name
strDBName = "YOUR_ORACLE_SERVICE_NAME"
Else
MsgBox "Database is other than ORACLE or Microsoft"
Exit Sub
End If
strSQL = "Select * from YOUR_TABLE"
Set objConn = dbConnection(strDBType, strDBName, "userid", "password")
'send EDIT_RECORD and strSQL as a part of parameters
Set objRecSet = CreateRecordSet(objConn, objRecSet, EDIT_RECORD, strSQL)

With objRecSet
.Fields("FIELD1").Value = "your value1"
.Update
End With
objRecSet.Close
objConn.Close
Set objRecSet = Nothing
Set objConn = Nothing
End Sub
'======================================
'End of Sample of subroutines...
'======================================

About this post

Posted: 2002-06-01
By: ArchiveBot
Viewed: 97 times

Categories

Visual Basic 6

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