oracle forms2

7/30/2019 Oracle Forms2

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Copyright 2004, Oracle. All rights reserved.

Running a Forms

Developer Application


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2-2 Copyright 2004, Oracle. All rights reserved.

Objectives

After completing this lesson, you should be able to dothe following:

Start OC4J

Describe the run-time environment Describe the elements in a running form

Navigate a Forms application

Describe the two main modes of operation

Run a form in a Web browser Retrieve both restricted and unrestricted data

Insert, update, and delete records

Display database errors


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Testing a Form: OC4J Overview

Oracle Application Server Containers for J2EE (OC4J)is:

Preferred to run Forms applications

Included with Oracle Developer Suite to enabletesting


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Testing a Form: Starting OC4J

On NT, run batch file to startOC4J: startinst.bat.

OC4J starts in DOS window:

Minimize window Closing window aborts OC4J

Run batch file to stop OC4J: stopinst.bat.


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Running a Form

Oracle Forms Services deployment:

Browser URL

Java Applet


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Running a Form: Browser

http://summit.com:8889/forms90/f90servlet?form=customers.fmx&userid=username/password@database&buffer_records=NO&debug_messages=NO&array=YES&query_only=NO

http://summit.com:8889/forms90/f90servlet?form=customers.fmx&userid=

How do Iaccess thisapplication?


7/292-7 Copyright 2004, Oracle. All rights reserved.

The Java Runtime Environment

The Forms applet runs in a Java RuntimeEnvironment (JRE) on the client machine.

Types of JREs:

Java-enabled browser (native) JInitiator (Oracle-supplied plug-in to Web browser)

that provides:Incremental Java archive (JAR) file downloadingJAR file caching

Applet instance cachingAutomatic Java security configuration



Starting a Run-Time Session

URL http://summit.com:8889/forms90/f90

Static HTML filesOC4Jor HTTP Server

Forms Servlet

Forms Listener Servlet

Forms Runtime Engine

Web Browser1

2

3

DBPLX filesMMX files

Forms Application Executables

FMX files

Web Server

Forms Services

Client Tier Middle Tier: Application Server




Forms Servlet




Web Browser


4

5Applet started 6



FMX files

Web Server

Forms Services

Middle Tier: Application ServerClient Tier



Web Server


Forms Servlet



Forms Services

8


Web Browser


Middle Tier: Application Server

8

7



FMX files

Client Tier



Forms ClientBase HTML filesForms ServletForms Listener ServletForms Runtime Engine

Application Server

Static HTML filesHTTP Server or OC4J

The Forms Servlet

DynamicHTML file is

created

Desktop Client

URL PARAMETERS:

?form=customers.fmx

&userid=un/pw@db&buffer_records=NO...

URL Pointing to Forms Servlet

basejini.html

formsweb.cfg

http://summit.com:8889/forms90/f90servlet?form=customers.f

Web Server

Forms Services



The Forms Client

Generic Java applet

Responsibilities:

Displays the forms user interface

Processes user interaction back toForms Services

Processes incoming messagesfrom Forms Services

GenericJava applet

Forms Client

Desktop Client



The Forms Listener Servlet

Java Servlet that: Creates Forms

Runtime processfor each client

Stops the Runtime process at session end

Manages network communications between clientand Forms Runtime process

Communicates through Web server process

HTTP Serveror

OC4J

Middle Tier

HTTP/HTTPS

FormsListenerServlet

FormsRuntimeProcess



The Runtime Engine

The Forms Runtime Engine:

Is a process (ifweb90) that runs on the

Application Server

Manages application logic and processing Communicates with the client browser and the

database



What You See at Run Time

1

3

4

5 2



Identifying the Data Elements

51 2 7 864 93 10



Modes of Operation: Enter-Query Mode

Allows:

Unrestricted andrestricted queries

Query/Where dialogbox

Record count by usingQuery > Count Hits

Does not allow:

Navigation out ofcurrent data block

Exiting run-timesession

Certain functions

Insert, update, delete



Modes of Operation: Normal Mode

Allows:

Unrestricted queries

Insert, update, delete

Commit (Save) Navigation out of

current data block

Exiting run-timesession

Does Not Allow:

Restricted queries

Query/Where dialog

box



Retrieving Data

1

34

2

A B C D12

Restricted query

A B C D

A B C D123

4

Unrestricted query

A B C D

12

34



Retrieving Restricted Data

Do not use quotation marks with character anddate items.

The LIKE operator is implied with % or _.

Use hash (#) in front of SQL operators. Use Query/Where for complex query conditions.

Use default date format (DD-MON-RR) inQuery/Where.

Use quotes around literals in Query/Where.



Query/Where Dialog Box

Invoke by:

Entering :variable_name

Executing query

Used to write: Complex search conditions

Queries with ORpredicates

ORDERBY clause



Query/Where Dialog Box

:i

:n

:i = 104 OR :n BETWEEN F and H



Inserting, Updating, and Deleting

Form module

Deletes

Updates

Inserts

Memory



Making Changes Permanent

Select Action > Save tomake changespermanent.

Select Action > ClearAll to discard changes.

or

Toolbar

Menu

To commit orrollback:

Deletes

Updates

Inserts

Memory


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Displaying Errors

Use to view Oracle errors

Select Help > Display Error

Shows Database Error window:

SQL statement Error information


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Summary

In this lesson, you should have learned that:

You can use OC4J on the development machine torun a Forms application in a Web browser

At run time: The Forms Client is downloaded

The Forms Servlet creates a start HTML file

The Forms Listener Servlet starts a run-timesession and maintains communication between it

and the Forms Client The Runtime Engine carries out application logic

and maintains a database connection on behalf ofthe Forms Client


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Summary

When you run a form you see a Java appletrunning in a browser and displaying a menu, menutoolbar, console, and several kinds of dataelements.

Users navigate a Forms application using themenu, toolbar, the mouse, buttons, or functionkeys.

The two main modes of operation are Normal

mode and Enter-Query mode. Executing a query returns all records, unless the

query is restricted by search criteria.


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Summary

In normal mode you can insert, update, and deleterecords and commit changes to the database.

You display database errors from the menu(Help > Display Error)


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Practice 2 Overview

This practice covers the following topics:

Starting OC4J

Running the course application:

Querying records Inserting a record

Updating a record

Deleting a record

Displaying a database error

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