Object Oriented ABAP

17. BI_PERSISTENT~LPOR Method:
The BI_PERSISTENT~LPOR method is the counterpart to the
BI_PERSISTENT~FIND_BY_LPOR method. It provides the persistent display for an existing
instance of an ABAP object.
Features:
The method returns the persistent display of an object reference as a SIBFLPOR type
structure as described earlier.
There is a close relationship between the BI_PERSISTENT~FIND_BY_LPOR method and the
BI_PERSISTENT~LPOR method. If we call the BI_PERSISTENT~FIND_BY_LPOR method first
and then the BI_PERSISTENT~LPOR method, the BI_PERSISTENT~LPOR method must
return the same value as was previously used to call the BI_PERSISTENT~FIND_BY_LPOR
method.
There are also several ways of implementing this method in this case. There is an
implementation example in the CL_SWF_FORMABSENC demo class.
18. BI_PERSISTENT~REFRESH Method:
SAP Web Flow Engine calls the BI_PERSISTENT~REFRESH method when the system has to
ensure that all values of an object are valid or that they agree exactly with the persistent
display of the object.
Features:
The method implementation depends on the internal organization of the class. We can check
the object instance data in the database, if necessary.