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ADO WillChangeRecordset 与 Rec
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The WillChangeRecordset Event
WillChangeRecordset事件
The WillChangeRecordset event is triggered before an operation changes the Recordset.
WillChangeRecordset事件是在记录集被更改前激发的。
Note: Before this event returns, set the status parameter to adStatusCancel to cancel the operation that caused this event or set it to adStatusUnwantedEvent to prevent subsequent notifications.
注意：在返回这个事件之前，将status[状态]参数设置为adStatusCancel可以取消运行该事件的操作程序；或者将其设置为adStatusUnwantedEvent可以阻止接下来一系列的通告提示
The RecordsetChangeComplete Event
RecordsetChangeComplete事件
The RecordsetChangeComplete event is triggered after a Recordset has changed.
RecordsetChangeComplete事件是在记录集被更改后激发的。
Note: Before this event returns, set the status parameter to adStatusUnwantedEvent to prevent subsequent notifications.
注意：在你返回这个方法之前，将status[状态]参数设置为adStatusUnwantedEvent可以阻止接下来一系列的通告提示。
Note: The WillChangeRecordset and the RecordsetChangeComplete event can occur when calling the Requery method or the Open method of a Recordset object.
注意：如果使用下列记录集操作中的其中一个操作来改变一个记录中的一个字段的话，WillChangeRecord事件或RecordChangeComplete事件可能会被触发：Update、Delete、CancelUpdate、AddNew、UpdateBatch和CancelBatch。
Syntax
语法
WillChangeRecord reason,status,objRs RecordsetChangeComplete reason,objErr,status,objRs |
| Parameter参数 | Description描述 |
|---|---|
| reason | An EventReasonEnum value that specifies the reason for this event 指定一个EventReasonEnum值。它是用来指定事件激发的原因的 |
| status | An EventStatusEnum value that indicates the status of the execution of the event 指定一个EventStatusEnum值，用于指示事件执行的状态 |
| objErr | The name of an Error object that describes the error if status is set to adStatusErrorsOccurred, otherwise it is not set 指定一个错误对象的名称。如果status[状态]设置为adStatusErrorsOccurred，那么该对象将描述具体的错误信息 |
| objRs | The name of the Recordset object that triggered this event 指定激发该事件的记录集对象的名称 |
EventReasonEnum Values
| Constant常量 | Value值 | Description描述 |
|---|---|---|
| adRsnRequery | 7 | An operation requeried the Recordset 指定一个请求记录集的操作 |
| adRsnResynch | 8 | An operation resynchronized the Recordset with the database 指定一个使数据库与记录集同步操作的程序 |
| adRsnClose | 9 | An operation closed the Recordset 指定一个关闭记录集的应用程序 |
EventStatusEnum Values
| Constant常量 | Value值 | Description描述 |
|---|---|---|
| adStatusOK | 1 | The operation that caused the event was successful |
| adStatusErrorsOccurred | 2 | The operation that caused the event failed 激发事件操作失败 |
| adStatusCantDeny | 3 | The operation that caused the event cannot be cancelled 不可以取消正处于处理执行中的操作 |
| adStatusCancel | 4 | The operation that caused the event is cancelled 取消激发事件的操作 |
| adStatusUnwantedEvent | 5 | Prevents subsequent notifications before the event method has finished executing 在时间的运行方法终止运行之前禁止后续的报告 |
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