topic Re: Persistent Classes in Application Development and Automation Discussions

Persistent Classes

Former Member — Mon, 01 Oct 2007 11:19:07 GMT

Hi all,

What are persistent classes and what is the usage of that?

Re: Persistent Classes

Former Member — Mon, 01 Oct 2007 11:22:38 GMT

Hi,

Look at the below SAP help link

http://help.sap.com/saphelp_nw04/helpdata/en/06/f23c3d638d11d4966d00a0c94260a5/frameset.htm

Regards

Sudheer

Re: Persistent Classes

Former Member — Mon, 01 Oct 2007 11:23:06 GMT

Persistent class

A special class, the attributes of which are linked to database tables via object-relational mapping. Since Release 6.10 they can be created using the Mapping

http://help.sap.com/saphelp_nw04/helpdata/en/f5/a36828bc6911d4b2e80050dadfb92b/frameset.htm

http://help.sap.com/saphelp_47x200/helpdata/en/ab/9d0a3ad259cd58e10000000a11402f/frameset.htm

Reward if usefull

Re: Persistent Classes

Former Member — Mon, 01 Oct 2007 11:24:09 GMT

see t his weblog

it may helpfull for you

/people/thomas.jung3/blog/2004/12/08/abap-persistent-classes-coding-without-sql

Re: Persistent Classes

varma_narayana — Mon, 01 Oct 2007 11:24:24 GMT

hI..

Persistent classes are used to implement Object Relational DBMS (ORDBMS) concept is SAP. That means each instance of Class in persistently stored in the Database.

reward if Helpful.

Re: Persistent Classes

Former Member — Mon, 01 Oct 2007 11:36:46 GMT

good

To use the Persistence Service for objects, the classes of these objects must be created as persistent classes in the Class Builder. The term persistent class does not imply that a class is persistent. (As a template for objects, every class is persistent). Rather, it means that the objects of that class and their state are managed by the Persistence Service. For example, the objects of these classes are instantiated in the ABAP program with a method of the Persistence Service, which ensures that the initialization is correct (not with the usual CREATE OBJECT statement). When the Class Builder creates a persistent class, it automatically generates an associated class, known as the class actor or class agent, whose methods manage the objects of persistent classes. As well as their identity, persistent classes can contain key attributes, which allow the Persistence Service to ensure that the content of each persistent object is unique.

thanks

mrutyun^