Using Caché Objects - InterSystems Documentation

Opening Objects
10.3 Opening Objects
You can open an already-existing persistent object using the following syntax:
Set oref = ##class(Classname).%OpenId(id)
where oref is the OREF of the opened object, Classname is its class, and id is the object
identifier associated with the object you want to open. Classname is case sensitive.
For example, to open a Sample.Person object with ID 22, use the following code:
Set person = ##class(Sample.Person).%OpenId(22)
Write person.Name,!
where person is the new OREF of the Person object.
Alternately, you can open an object using its full OID value:
Set oref = ##class(Classname).%Open(oid)
where oref is the OREF of the opened object, Classname is its class, and oid is the complete
OID.
Typically, an application will use the %OpenId method.
Once you have opened an object, you can then view or modify its properties using methods
as described in the section “Executing Methods.”
10.4 Modifying Objects
Along with its methods, an object has properties, which define its state. Most properties hold
values, such as a person's name or date of birth; there are also properties called relationships,
which hold associations between objects.
The general syntax for modifying the state of a property (that is, the data that defines its value)
of an object is:
Set oref.PropertyName = value
where oref is the OREF of the specific object, PropertyName is the name of the property to
associate the data with, and value is the actual data.For example, to assign a value to the
Name property of a Person object, use the following code:
Using Caché Objects 71