Execute, Requery, Clear Methods Example
This example demonstrates the Execute method when run from both a Command object and a Connection object. It also uses the Requery method to retrieve current data in a recordset, and the Clear method to clear the contents of the Errors collection. The ExecuteCommand and PrintOutput procedures are required for this procedure to run.
Sub ExecuteX()
Dim strSQLChange As String
Dim strSQLRestore As String
Dim strCnn As String
Dim cnn1 As ADODB.Connection
Dim cmdChange As ADODB.Command
Dim rstTitles As ADODB.Recordset
Dim errLoop As ADODB.Error
' Define two SQL statements to execute as command text.
strSQLChange = "UPDATE Titles SET Type = " & _
"'self_help' WHERE Type = 'psychology'"
strSQLRestore = "UPDATE Titles SET Type = " & _
"'psychology' WHERE Type = 'self_help'"
' Open connection.
strCnn = "driver={SQL Server};server=srv;" & _
"uid=sa;pwd=;database=pubs"
Set cnn1 = New ADODB.Connection
cnn1.Open strCnn
' Create command object.
Set cmdChange = New ADODB.Command
cmdChange.ActiveConnection = cnn1
cmdChange.CommandText = strSQLChange
' Open titles table.
Set rstTitles = New ADODB.Recordset
rstTitles.CursorType = adOpenDynamic
rstTitles.LockType = adLockPessimistic
rstTitles.Open "titles", cnn1
' Print report of original data.
Debug.Print _
"Data in Titles table before executing the query"
PrintOutput rstTitles
' Clear extraneous errors from the Errors collection.
cnn1.Errors.Clear
' Call the ExecuteCommand function to execute cmdChange command.
ExecuteCommand cmdChange, rstTitles
' Print report of new data.
Debug.Print _
"Data in Titles table after executing the query"
PrintOutput rstTitles
' Use the connection object's execute method to execute
' SQL statement to restore data. Trap for errors,
' checking the Errors collection if necessary.
On Error GoTo Err_Execute
cnn1.Execute strSQLRestore
On Error GoTo 0
' Retrieve the current data by requerying the recordset.
rstTitles.Requery
' Print report of restored data.
Debug.Print "Data after executing the query " & _
"to restore the original information"
PrintOutput rstTitles
rstTitles.Close
cnn1.Close
Exit Sub
Err_Execute:
' Notify user of any errors that result from
' executing the query.
If Errors.Count > 0 Then
For Each errLoop In Errors
MsgBox "Error number: " & errLoop.Number & vbCr & _
errLoop.Description
Next errLoop
End If
Resume Next
End Sub
Sub ExecuteCommand(cmdTemp As ADODB.Command, _
rstTemp As ADODB.Recordset)
Dim errLoop As Error
' Run the specified Command object. Trap for errors,
' checking the Errors collection if necessary.
On Error GoTo Err_Execute
cmdTemp.Execute
On Error GoTo 0
' Retrieve the current data by requerying the recordset.
rstTemp.Requery
Exit Sub
Err_Execute:
' Notify user of any errors that result from
' executing the query.
If Errors.Count > 0 Then
For Each errLoop In Errors
MsgBox "Error number: " & errLoop.Number & vbCr & _
errLoop.Description
Next errLoop
End If
Resume Next
End Sub
Sub PrintOutput(rstTemp As ADODB.Recordset)
' Enumerate Recordset.
Do While Not rstTemp.EOF
Debug.Print " " & rstTemp!Title & _
", " & rstTemp!Type
rstTemp.MoveNext
Loop
End Sub
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