03 Lesson01 Labs

8/7/2019 03 Lesson01 Labs

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Lesson 1 Labs: Working in the 4GLEnvironment


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1-2 4GL EssentialsCopyright 2005 PSC

Notes


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Lesson 1 Labs 1-3Copyright 2005 PSC

Lab 1-1: Setting the PROPATH


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Lab 1-1: Setting the PROPATH

Introduction

In this lab you set the PROPATH so the 4GL at runtime knows where to find yourfiles. It is very important to set the PROPATH correctly so that your lab files will run

properly for the rest of this course.

Duration

This lab should take about 5 minutes to complete.

Set the PROPATH

Follow these steps to set the PROPATH:

1. Start the Desktop.2. Choose ToolsPRO*Tools3. On the PRO*Tools palette, choose the PROPATH icon.4. Add the following directories in the WRK directory to the PROPATH:

4GLE\Labs

4GLE\Solutions

4GLE\Examples

Change the order of the PROPATH entries

Modify the search order so that the top four directories are searched in this order:

1. [current directory]2. ..4GLE\Labs3. ..4GLE\Solutions4. ..4GLE\Examples

Save your changes

Save your changes now and for future sessions.


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Lab 1-2: Using the Procedure Editor


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Lab 1-2: Using the Procedure Editor

Introduction

In this lab you use the Procedure Editor to open and run a file. You also create andsave two new files, and switch between file buffers.

Duration


Compare DISPLAY and MESSAGE statements

In the classroom demonstrations you saw the 4GL statements DISPLAY and

MESSAGEVIEW-AS ALERT-BOX being used.

Refer to the files in your Examples directory:

eToday.p to see DISPLAY

eWelcome.p to see MESSAGEVIEW-AS ALERT-BOX

Question: What is the difference between the appearances of the output for these two

statements?

Open and run a file

1. In the Procedure Editor, open the file in the Labs directory lWelcome2.p.

2. Run the file.3. Return to the Procedure Editor window.

continued on next page


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Lab 1-2: Using the Procedure Editor, continued

Create and save a new file

Follow these steps to create and save a new file:

1. Open a new buffer.2. Type a statement to display a hello message with your name. The output should

look similar to the following:

3. Add a comment to the file that says what the procedure does.4. Check your syntax.5. Run the procedure.

6. Save the file as lMyName.p in your Labs directory.

Use multiple buffers

Follow these steps to create a file in a new buffer:

1. Open a new buffer.2. Display a message with the current year in an alert box.3. Check your syntax.4. Run the file.5. Save your file as lYear.p in the Labs directory.

6. Run the procedure. The output should look similar to the following:

Switch between buffers

Follow these steps to switch between buffers:

1. Switch to the buffer that contains lMyName.p.2. List all the open buffers.Question: How many buffers are listed?

3. Switch to the buffer that contains lYear.p.4. Exit from the Procedure Editor.


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Notes


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Lab 1-3: Using OpenEdge on-line Help


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Lab 1-3: Using OpenEdge on-line Help

Objectives

In this lab you explore on-line Help and learn how to search for information about the4GL tools and language.

Use on-line Help as needed as you learn how to build applications and write 4GL

code.

Duration


Part I: Exploring Master Help

A: Reference Help

1. Open Reference Help.

2. Select 4GL Language Reference Help 4GL Reference.

What is the 4GL syntax for a comment?

B: Application Help

1. Open Application Help.

2. Select Data Dictionary HelpManaging Databases Database Tasks.

What tasks can you perform in the Data Dictionary?



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Lab 1-3: Using OpenEdge on-line Help, continued

Part II: Exploring Master Help with an Internet connection

Please note that you can complete the following exercises (C and D) only if you areconnected to the Internet.

C: Technical Whitepapers

Select External Help Resources Technical Whitepapers

Internet Technologies.

What is the name of the whitepaper that discusses XML?

D: Online Manuals

1. Select External Help ResourcesOnline ManualsOpenEdge Development: Progress 4GL Handbookby John Sadd.

2. Navigate to the chapter on Using Basic 4GL Constructs.

Why would you use WHERE in the 4GL?

Part III: Exploring context-sensitive Help

E: Get information about 4GL code

1. Open the file lToday.p.

2. Highlight the word TODAY.3. Get context sensitive help on the TODAY function.

What is the TODAY function used for in the sample procedure r-today.p,

shown in on-line Help?

4. Add the TODAY function to your Help Favorites.5. Look up the meaning of the word CHARACTER.

What is the Help definition of CHARACTER?

6. Add the CHARACTER datatype to your Help Favorites.



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Lab 1-3: Using OpenEdge on-line Help, continued

Part III: Exploring context-sensitive Help, continued

7. Use any means available to find information about + operator: addition.

What does this operator do?

8. Now look up + operator: concatenation.

How does this + operator differ from + operator: addition?

9. Select date addition. What is the code in the example that adds days to a date?

F: See what options there are with a particular tool

1. Open the PRO*Tools palette.2. Get context-sensitive help for PRO*Tools.

Hint:Use the F1 key anywhere in the PRO*Tools palette.

3. Find out how to display the menu bar, and try it out on the PRO*Tools palette.Hint: Look in the Browse sequence to find the solution.


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Solution for Lab 1-1

Set the PROPATH

Follow these steps to set the PROPATH:

1. Start the Desktop.

2. Choose ToolsPRO*Tools

3. On the PRO*Tools palette, choose the PROPATH icon.



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Solution for Lab 1-1, continued

Set the PROPATH, continued

4. Add the following directories from your WRK directory to the PROPATH: 4GLE\Examples 4GLE\Labs

4GLE\Solutions



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Change the order of the PROPATH entries

Modify the search order so your directories are searched in this order:

1. [current directory]2. ..4GLE\Labs3. ..4GLE\Solutions4. ..4GLE\Examples

Save your changes

Save your changes now and for future sessions.

Answer: Choose OK in the PROPATH Editor, then choose Yes to save your changes

for future sessions.


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Compare DISPLAY and MESSAGE statements

In the classroom demonstrations you saw the 4GL statements DISPLAY and

MESSAGEVIEW-AS ALERT-BOX being used.

Refer to the files in your WRK directory:

eToday.p to see DISPLAY

eWelcome.p to see MESSAGEVIEW-AS ALERT-BOX

Question: What is the difference between the appearances of the output for these two

statements?

Answer:

DISPLAY generates a message that is overlaid on top of the procedure editor. MESSAGEVIEW-AS ALERT-BOX displays the message in a dialog box

which includes an OK button and a Windows close (X) in the top right corner.

Note: Dialog boxes will be described in a later lesson.

Open and run a file

1. Choose the Procedure Editor icon to start the Procedure Editor, then open thefile Labs\lWelcome2.p.

2. Run the file. The output should appear as follows:

Create and save a new file

Your code should be similar to the following:

/* sMyName.p */

/* This procedure displays a message with the author's name. */

DISPLAY "Hello. My name is ."



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Use multiple buffers

Your code should be similar to the following:

/* sYear.p */

/* This program displays the current year. */

MESSAGE "The current year is" YEAR(TODAY) VIEW-AS ALERT-BOX.

Switch between buffers

Question: How many buffers are listed?

Answer: You should see four buffers listed, including the blank initial buffer.


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Objectives

In this lab you explore on-line Help and learn how to search for information about the

4GL tools and language.

Use on-line Help as needed as you learn how to build applications and write 4GL

code.

Part I: Exploring Master Help

A: Reference Help

1. Open Reference Help.

2. Select 4GL Language Reference Help 4GL Reference.

What is the 4GL syntax for a comment?

Answer: /* comment */

B: Application Help

1. Open Application Help.

2. Select Data Dictionary HelpManaging Databases Database Tasks.

What tasks can you perform in the Data Dictionary?

Answer:

Connecting a database

Creating a database

Disconnecting a database

Saving changes to a database

Switching to another connected database

Viewing database properties



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Part II: Exploring Master Help with an Internet connection

You can do the following exercises (C and D) only if you are connected to the

Internet.

C: Technical Whitepapers

Select External Help Resources Technical WhitepapersInternet Technologies.

What is the name of the whitepaper that discusses XML?

Answer: Using XML with the Progress 4GL.

D: Online Manuals

1. Select External Help ResourcesOnline ManualOpenEdge

DevelopmentProgress 4GL Handbookby John Sadd.2. Go to the chapter on Using Basic 4GL Constructs.

Why would you use WHERE in the 4GL?

Answer: To refine the data selection.

Part III: Exploring context-sensitive Help

E: Get information about 4GL code

1. Open the file lToday.p.2. Highlight the word TODAY.3. Get context sensitive help on the TODAY function.

What is the business purpose with the way that the TODAY function is used in

the sample procedure r-today.p, shown in on-line Help?

Answer: It prints the date on the first line at the top of each page of a report.

4. Add the TODAY function to your Help Favorites.5. Look up the meaning of the word CHARACTER.

What is the Help definition of CHARACTER?

Answer: CHARACTER data consists of numbers, letters, and special characters.

6. Add the CHARACTER datatype to your Help Favorites.



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Part III: Exploring context-sensitive Help, continued

E: Get information about 4GL code, continued

7. Use any means available to find information about + operator: addition.

What does this operator do?

Answer: It adds two numeric expressions.

8. Now look up + operator: concatenation.

How does this + operator differ from + operator: addition?

Answer: It produces a character value by joining two character strings or

expressions.

9. Select date addition. What is the code in the example that adds days to a date?Answer:date + days

F: See what options there are with a particular tool

1. Open the PRO*Tools palette.2. Get context-sensitive help for PRO*Tools.3. Find out how to display the menu bar, and try it out on the PRO*Tools palette.

Hint: Look in the Browse sequence to find the solution.

Answer: To display the menu bar on the palette, place the mouse pointer over an

icon on the palette and press the right mouse button, then select Menu Bar.


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Notes

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