Q: How do I roll back the operation query executed by docmd. runsql statements? A: You want to use Docmd. RUNSQL implements the transaction RollBack operation. Unfortunately, Access cannot use Docmd. RUNSQL to implement transaction rollback 4. in the help of runsql statement operations, the option is UseTrans.
Q: How do I roll back the operation query executed by docmd. runsql statements? A: You want to use Docmd. RUNSQL implements the transaction RollBack operation. Unfortunately, Access cannot use Docmd. RUNSQL to implement transaction rollback 4. in the help of runsql statement operations, the option is UseTrans.
Problem:
Docmd. runsql
Statement
RunOf
Operation
Query
HowRollback?
Answer:
You want to use Docmd. RUNSQL to roll back a transaction)
Operation
Unfortunately, Access cannot implement transaction rollback through Docmd. RUNSQL.
Statement
OperationIs UseTransaction. This option is used to confirm whether
StatementTransactional
Operation. If True is selected (True by default), all
OperationWill be treated as a separate Atom
OperationTo perform
Operation; If False is selected
OperationIt will not be treated as a transaction (Dirty Read may occur in the case of multiple users. However, these transactions are completed internally, and we cannot display them by declaring commit or rollback.
Operation.
In my experience, ACCESS cannot use Docmd. OPENQUERY to display similar transactions.
Operation. If you want to implement the transaction
OperationThe unique usage is implemented through WorkSpaceObject. BeginTrans. In the Help File of Access VBA, you can find the following example:
'Ininbegintransvb
'To integrate this code
'Replace the data source and initial catalog values
'In the connection string
Public Sub Main ()
On Error GoTo ErrorHandler
'Recordset and connection variables
Dim Cnxn As ADODB. Connection
Dim strCnxn As String
Dim rstTitles As ADODB. Recordset
Dim strSQLTitles As String
'Record variables
Dim strTitle As String
Dim strMessage As String
'Open connection
StrCnxn = "Provider = 'sqloledb'; Data Source = 'mysqlserver ';"&_
"Initial Catalog = 'pubs'; Integrated Security = 'sspi ';"
Set Cnxn = New ADODB. Connection
Cnxn. Open strCnxn
'Open recordset dynamic to allow for changes
Set rstTitles = New ADODB. Recordset
StrSQLTitles = "Titles"
RstTitles. Open strSQLTitles, Cnxn, adOpenDynamic, adLockPessimistic, adCmdTable
Cnxn. BeginTrans
'Loop through recordset and prompt user
'To change the type for a specified title
RstTitles. MoveFirst
Do Until rstTitles. EOF
If Trim (rstTitles! Type) = "psychology" Then
StrTitle = rstTitles! Title
StrMessage = "Title:" & strTitle & vbCr &_
"Change type to self help? "
'If yes, change type for the specified title
If MsgBox (strMessage, vbYesNo) = vbYes Then
RstTitles! Type = "self_help"
RstTitles. Update
End If
End If
RstTitles. MoveNext
Loop
'Prompt user to commit all changes made
If MsgBox ("Save all changes? ", VbYesNo) = vbYes Then
Cnxn. CommitTrans
Else
Cnxn. RollbackTrans
End If
'Print recordset
RstTitles. Requery
RstTitles. MoveFirst
Do While Not rstTitles. EOF
Debug. Print rstTitles! Title & "-" & rstTitles! Type
RstTitles. MoveNext
Loop
'Restore original data as this is a demo
RstTitles. MoveFirst
Do Until rstTitles. EOF
If Trim (rstTitles! Type) = "self_help" Then
RstTitles! Type = "psychology"
RstTitles. Update
End If
RstTitles. MoveNext
Loop
'Clean up
RstTitles. Close
Cnxn. Close
Set rstTitles = Nothing
Set Cnxn = Nothing
Exit Sub
ErrorHandler:
'Clean up
If Not rstTitles Is Nothing Then
If rstTitles. State = adStateOpen Then rstTitles. Close
End If
Set rstTitles = Nothing
If Not Cnxn Is Nothing Then
If Cnxn. State = adStateOpen Then Cnxn. Close
End If
Set Cnxn = Nothing
If Err <> 0 Then
MsgBox Err. Source & "-->" & Err. Description, "Error"
End If
End Sub
'Enabledintransvb
Finally, we strongly recommend that you read the following documents. This document has a chapter: usage and definition of Transactions in Access.
Advanced Microsoft Jet SQL for Access 2000
Http://msdn.microsoft.com/library/default.asp? Url =/library/en-us/dnacc2k/html/acadvsql. asp
