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) | |
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Public Overloads Function UpdateDeleteRaw( _ ByVal startTime As Date, _ ByVal endTime As Date, _ ByVal serverHnd() As Integer, _ ByRef errors As Integer() _ ) As Integer | |
| C# | |
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public int UpdateDeleteRaw( DateTime startTime, DateTime endTime, int[] serverHnd, out int[] errors ) | |
Parameters
- 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.
- 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