ADO WillChangeField en FieldChange Complete Events
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Die WillChangeField-geleentheid
Die WillChangeField-gebeurtenis word geaktiveer voordat die waardes van een of meer veldobjekte verander.
Let wel: Voordat hierdie gebeurtenis terugkeer, stel die statusparameter op adStatusCancel om die bewerking wat hierdie gebeurtenis veroorsaak het, te kanselleer.
Die FieldChangeComplete-gebeurtenis
Die FieldChangeComplete-gebeurtenis word geaktiveer nadat die waardes van een of meer veldobjekte verander is.
Let wel: Voordat hierdie gebeurtenis terugkeer, stel die statusparameter op adStatusUnwantedEvent om daaropvolgende kennisgewings te voorkom.
Let wel: Die WillChangeField-gebeurtenis en die FieldChangeComplete-gebeurtenis kan voorkom wanneer jy die Waarde-eienskap stel en die Update-metode oproep met veld- en waardeskikkingparameters.
Sintaksis
WillChangeField numfields,fields,status,objRs
FieldChangeComplete numfields,fields,objErr,status,objRs
| Parameter | Description |
|---|---|
| numfields | The number of Field objects in fields |
| fields | An array that contains Field objects with changes |
| 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 |
EventStatusEnum-waardes
| 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 |
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