Booa8 Slide 04

Buliding Object-Oriented Applications in PowerBuilder Module 4 : Object Instances

Objectives ,[object Object],[object Object],[object Object],[object Object],[object Object]

Topics ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Object Instances ,[object Object],[object Object],[object Object]

[object Object],[object Object],Example of an Instance in PowerBuilder

Instantiating Visual Classes — Open( ) ,[object Object],[object Object],[object Object],[object Object],[object Object]

Instantiating Visual Classes — Open( ) ,[object Object],[object Object],[object Object],[object Object]

Instantiating Visual Classes — Open( ) ,[object Object],[object Object],Class pool Open(w_cust) Global memory No hit! w_frame w_main Instance pool

Instantiating Visual Classes — Open( ) ,[object Object],[object Object],Class pool w_cust Global memory w_cust w_frame w_main A B C w_app w_cust, w_main w_frame etc. Instance pool

Instantiating Visual Classes — Open( ) ,[object Object],[object Object],[object Object],A B C Global memory w_cust w_frame w_main Class pool Instance of w_cust w_cust w_cust w_app w_cust w_main w_frame etc. Instance pool

Instantiating Visual Classes — Open( ) ,[object Object],A.PBLB.PBLetc. Global memory w_cust w_frame w_main Class pool Instance of w_cust w_cust w_cust w_app w_cust w_main w_frame etc. Instance pool

What Happens During Instantiation? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Resolving Ancestor References ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

PowerBuilder Data Types ,[object Object],[object Object],[object Object]

Standard Data Types ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Class Data Types ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Structures ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Instantiating Nonvisual Classes ,[object Object],[object Object],[object Object],[object Object]

Instantiating Classes — CREATE ,[object Object],[object Object],Local memory Global memory Class pool Instance pool instance 1 of transaction w_cust w_frame transaction transaction SQLCA transaction Itrans_temp

Instantiating Classes ,[object Object],[object Object],[object Object],[object Object],[object Object]

Instantiating Classes — PopMenu( ) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Instantiating Data Stores ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Summary ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Lab Setup ,[object Object],[object Object],[object Object],[object Object],[object Object]

Lab Debriefing ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Lab DeBriefing ,[object Object],[object Object],[object Object],[object Object]

Lab Debriefing ,[object Object],[object Object],[object Object]

Lab Debriefing ,[object Object]

Booa8 Slide 04

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Booa8 Slide 04