rdb-RdbmsPointDeviceExt

This component provides point import capability for the various relational database drivers using methods and views that are similar to other proxy point driver views. It is available under most of the rdb (relational database) types, including OracleDatabase, SqlServerDatabase, and MySQLDatabase.

The Points folder (Rdbms Point Device Extension) is unlike point device extensions associated with other driver types. This point device extension uses the Rdbms Point Query component to filter database records to provide candidate records for proxy points.

Figure 29. Rdbms Point Query properties

To access these properties, expand Config > Drivers, expand the rdb database and double-click Points.

General information

With this component you can represent relational database cell values as proxy points. The RdbmsNetwork driver requires no configuration.

Rdb database devices resemble typical field-bus functionality in that Workbench represents them as devices. You can view all devices that are under the RdbmsNetwork in a Device Manager view, or in the Nav tree, with each device that is installed under the network representing an individual database type and connection.

The Rdbms Point Device Extension provides point import capability for the various relational database drivers using methods and views that are similar to other proxy point driver views. Using this point device extension to import points, you can represent relational database cell values as proxy points, as shown below.

Figure 30. Rdbms points

The Rdbms Point Device Extension (RdbmsPointDeviceExt) may contain one or more Rdbms Point Query properties (depending on how many you add). Individual points are then added under each individual Rdbms Point Query property using the discover and add process available in the Rdbms Point Query Manager view. Rdbms Points are always organized under their parent Rdbms Point Query in the Nav tree and are also displayed in the Database pane of the Rdbms Point Query Manager view.

Point container similarities (compared to other drivers)

Like other Point Device Extensions, the Rdbms Point Device Extension:

is a required (frozen) slot on the Rdbms Point Device component - it's always there, you cannot delete it.
displays as a typical Points node under its appropriate RdbmsNetwork driver.
is a container component, having several special views.
is a parent of proxy points.
has a default manager view (the Rdbms Point Device Ext Manager view) and uses Discover, Add, and New buttons to add proxy points.

Point container differences (compared to other drivers)

Unlike other Point Device Extensions, the Rdbms Point Device Extension:

has a unique default view - the Rdbms Point Device Extension Manager view.
has a unique child component - the Rdbms Point Query component.
has proxy points under the Rdbms Point Device Extension that are read-only; you cannot write to the Rdbms using these points.
has proxy points under the Rdbms Point Device Extension that use recorded database values not live values. It is possible to have points from the database update very frequently, depending on database archiving and updating parameters, but the data are always coming from a secondary source - the database, not a control point.