ADO Gli eventi WillChangeRecord e RecordChangeComplete
❮ Riferimento completo dell'oggetto Recordset
L'evento WillChangeRecord
L'evento WillChangeRecord viene attivato prima di una o più modifiche al record.
Nota: prima che questo evento si ripresenti, imposta il parametro status su adStatusCancel per annullare l'operazione che ha causato questo evento o impostalo su adStatusUnwantedEvent per evitare notifiche successive.
L'evento RecordChangeComplete
L'evento RecordChangeComplete viene attivato dopo la modifica di uno o più record.
Nota: prima che questo metodo venga restituito, impostare il parametro status su adStatusUnwantedEvent per evitare notifiche successive.
Nota: l'evento WillChangeRecord o l'evento RecordChangeComplete può verificarsi se si modifica un campo in un record utilizzando una delle seguenti operazioni Recordset: Update, Delete, CancelUpdate, AddNew, UpdateBatch e CancelBatch.
Sintassi
WillChangeRecord reason,numrec,status,objRs
RecordChangeComplete reason,numrec,objErr,status,objRs
| Parameter | Description |
|---|---|
| reason | An EventReasonEnum value that specifies the reason for this event |
| numrec | Indicates the number of records affected |
| status | An EventStatusEnum value that indicates the status of the execution of the event |
| objErr | The name of an Error object that describes the error if status is set to adStatusErrorsOccurred, otherwise it is not set |
| objRs | The name of the Recordset Object that triggered this event |
EventReasonEnum valori
| Constant | Value | Description |
|---|---|---|
| adRsnAddNew | 1 | An operation added a new record |
| adRsnDelete | 2 | An operation deleted a record |
| adRsnUpdate | 3 | An operation updated an existing record |
| adRsnUndoUpdate | 4 | An operation reversed the update of a record |
| adRsnUndoAddNew | 5 | An operation reversed the addition of a new record |
| adRsnUndoDelete | 6 | An operation reversed the deletion of a record |
| adRsnFirstChange | 11 | An operation made the first change to a record |
EventStatusEnum Valori
| Constant | Value | Description |
|---|---|---|
| adStatusOK | 1 | The operation that caused the event was successful |
| adStatusErrorsOccurred | 2 | The operation that caused the event failed |
| adStatusCantDeny | 3 | The operation that caused the event cannot be cancelled |
| adStatusCancel | 4 | The operation that caused the event is cancelled |
| adStatusUnwantedEvent | 5 | Prevents subsequent notifications before the event method has finished executing |
❮ Riferimento completo dell'oggetto Recordset