This method deletes the values, qualities, and timestamps from the history database for the specified time domain for one or more items. This method is intended to be used to delete data that has been accidentally entered into the history database; e.g., deletion of data from a source with incorrect timestamps. If no data is found in the time range for a particular item, a success status of S_FALSE is returned and the error code for that item is OPC_S_NODATA.
Syntax
| Visual Basic (Declaration) | |
|---|---|
Overloads Function UpdateDeleteRaw( _ ByVal transactionID As Integer, _ ByVal startTime As Date, _ ByVal endTime As Date, _ ByVal serverHnd() As Integer, _ ByRef cancelID As Integer, _ ByRef errors As Integer() _ ) As Integer | |
| C# | |
|---|---|
int UpdateDeleteRaw( int transactionID, DateTime startTime, DateTime endTime, int[] serverHnd, out int cancelID, out int[] errors ) | |
Parameters
- transactionID
- An identifier created by the client and passed to the server in this call. The server shall return this identifier along with the results of this call.
- startTime
- The beginning of the history period to be read.
- endTime
- The end of the history period to be read.
- serverHnd
- The list of server item handles for the items to be deleted.
- cancelID
- Place to return a Server generated ID to be used in case the operation needs to be canceled.
- errors
- Array of HRESULTs indicating whether the corresponding server handle was valid.
Return Value
HRESULTS success/error code.Requirements
Target Platforms: Windows XP Professional, Windows Server 2003 family, Windows Vista, Windows 7, Windows Server 2008 family