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Referencing Variables in SQL Statements
Values returned from a database using SQL require program storage (variables)
Variables of the appropriate data type must be declared
Within a SQL statement, program variables must be preceded by a colon
Example
string ls_department
long ll_deptid
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Transition to the Client/Server Environment
The traditional environment
Mainframe or minicomputer environment.
All the processes run on a single CPU.
A multitasking operating system
Task switching
Prioritization
Data communications
Connectivity tasks
The Client/Server Environment
Client/se
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Summary
An event is an action initiated by the user or the system.
An object is any item that combines characteristics (properties) and behaviors (methods).
Scripts describe the processing that should take place when an event occurs.
Encapsulation prevents users from seeing the internal workings
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Summary
Objects, events, and properties are key to developing applications with PowerBuilder.
Properties are characteristics of an object.
Events permit the object to recognize and respond to actions.
You can build application objects, DataWindow objects, menus, structures, user objects, and win
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Summary
Windows are the main interface between the user and PowerBuilder applications.
Window style and the controls determine how the window looks and behaves.
Establish the style of window by choosing values for its properties.
There are six window types.
Controls are placed in a window.
Sum
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