OPC Historian .NET Server Toolkit Reference
I_HDAPluginDBA Namespace
| I_HDAPluginDBANet4 Assembly : I_HDAPluginDBA Namespace |
Interface definition for the HDANSrv Database Access layer HDAPluginDBA.
The interface defines the methods, data classes and enumerations that are used by the base layer DLL and possibly the generic HDANSrv server.
The interface must not be changed without adapting the base layer and the generic server.
| Class | Description | |
|---|---|---|
 | AnnotationRequest | |
| AnnotationVal | Annotation value. |
| AnnotationValUpdate | |
| DataPoint | Raw data read from the database for one data point |
| DataPointAnnotation | Annotation data read from the database for one data point |
| DataPointAttr | Attribute data read from the database for one data point |
| DataPointModified | Data of a modified data point read from the database |
| DataPointUpdate | |
| DefAggregate | Aggregate definition data. |
| DefItemAttribute | Item attribute definition data. |
| DeletePoint | |
| DeleteRequest | |
| HandleList | List of item handles. The index in this list is used as the server item handle. No elements must be removed in order to prevent index changes. |
| HDAException | |
| HRESULTS | HRESULTS enumerator. Defines the OPC error codes. |
| ItemInfo | Information to associate an item handle with the data source. |
| UpdateRequest |
| Interface | Description | |
|---|---|---|
 | IBrowserDBA | This methods are called from the generic server and the class and method names must not be changed. They must be implemented according the OPC HDA specification. |
| IDBAPlugin | Annotations read and insert handling. These methods are called either from: - the client call handling for synchronuos calls - the annotation handling thread for asynchronus calls Interface definition for the HDANSrv Database Access layer HDAPluginDBA. The interface defines the methods, data classes and enumerations that are used by the base layer DLL and possibly the generic HDANSrv server. The interface must not be changed without adapting the base layer and the generic server. Update handling. The methods update the database by inserting, replacing or deleting data points. These methods are called either from: - the client call handling for synchronuos calls - the update handling thread for asynchronuos calls |
| Enumeration | Description | |
|---|---|---|
 | AggregateType | OPC HDA defined aggregates. |
| BrowseDirection | OPC HDA defined BrowseDirection enumerator |
| BrowseType | OPC HDA defined BrowseType enumerator |
| HDAEditType | Enumeration that indicates the way in which the history data is to be edited. |
| HDAServerStatus | OPC HDA defined server states |
| OPCHDAQuality | OPC defined item quality values |
| OperatorCodes | OPC HDA defined Operator enumerator |
| UpdateRequestType | |
| UpdCapabilities | Implemented server capapilities for Update handling. |