Databases Reference
In-Depth Information
Conversely, if the underlying database record is updated outside our process
(for example, by the
AuctionItem
process), then the next time we reference the
content of the entity variable, we will receive the updated variable.
Binding to the Listing entity
The
Auction Process
is another example of how we typically want to interact with an
SDO via an entity variable.
In this scenario, we want to retrieve details of the Listing against which the auction is
being held. As bids are placed, we record details of them against the listing as well as
update the listing itself with details of the winning bid.
As with the
ListItem
composite, we need to define an ADF-BC External Service
in the
AuctionItem
composite for the
ListingSDO
, and within the
AuctionItem
process, define a corresponding entity variable.
Again, as with the
ListItem
, before we can perform any operations on the entity
variable, we must first bind it to an SDO. Previously, we did this using the
Create
Entity
activity, but as the SDO in question already exists, we need to use the
Bind
Entity
activity.
To do this, drag a
Bind Entity
activity from the
Component Palette
on to your BPEL
process. Double-click on it; this will open the
Bind Entity
activity window, as shown
in the following screenshot:
We specify the
Name
and
Entity Variable
as we did for the
Create Entity
activity.
The final value we need to specify is the unique key for the Entity object that we wish
to bind to.
