Eventi ADO WillConnect , ConnectComplete e Disconnect
❮ Completare il riferimento all'oggetto di connessione
Un evento è una subroutine che può essere richiamata automaticamente dopo che si è verificata un'operazione specifica.
- L' evento WillConnect può essere attivato prima dell'avvio di una connessione.
- L' evento ConnectComplete può essere generato dopo l'avvio di una connessione.
- L' evento Disconnect può essere generato al termine di una connessione.
Sintassi
WillConnect ConnectionString,userid,psword,options,status,objcon
ConnectComplete objerror,status,objconn
Disconnect status,objconn
| Parameter | Description |
|---|---|
| ConnectionString | A string that contains the information required for the connection |
| userid | A string that contains the user name for the connection |
| psword | A string that contains the password for the connection |
| options | A long value that specifies how the provider should evaluate the ConnectionString. Can only be set to adAsyncOpen |
| objerror | An Error object that contains the errors that occurred
Note: The EventStatusEnum value must be set to adStatusErrorsOccurred to create the Error object |
| status | An EventStatusEnum value.
Default is adStatusOK
However, when the ConnectComplete event is called, this parameter is set to adStatusCancel IF a WillConnect event calls for cancelling of the pending connection |
| objconn | The Connection object that fired the event |
EventStatusEnum Valori
| Constant | Value | Description |
|---|---|---|
| adStatusOK | 1 | The operation that fired the event was successful |
| adStatusErrorsOccurred | 2 | The operation that fired the event failed |
| adStatusCantDeny | 3 | Cannot cancel the pending operation |
| adStatusCancel | 4 | Cancels the operation that fired the event |
| adStatusUnwantedEvent | 5 | Prevents subsequent notifications before the event method has finished executing |
❮ Completare il riferimento all'oggetto di connessione