Tutorial for Forms 6i

7/31/2019 Tutorial for Forms 6i

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Tutorial for Forms 6i:

In this lesson you will learn:

What is Developer/2000

Tools provided by Developer/2000 to create Forms and Reports

How to log on to Developer/2000

Create your first block and form based on your Student table

What Is Developer/2000?

Developer/2000 is an Oracle tool that helps you to create forms and reports based on the tables

that you have created using Designer/2000. You can use Developer/2000 to:

Design and customize your forms and reports.

Add various functionality, like radio buttons, combo boxes, and list of values to makeyour forms and reports more user friendly.

Write triggers on your objects to add functionality to them and capture errors.

Tools Provided By Oracle Developer/2000

Oracle Developer/2000 provides four tools:

Object Navigator: In this tool you can view all your objects, add new objects and

name/rename your objects.

Layout Editor: This tool helps you design your forms and reports and add various objects

to them like push buttons and list boxes. PL/SQL Editor: This is the tool that is used to write all the codes for the triggers,

procedures or functions.

Menu Editor: This tool will help you create a customized menu that can be attached toyour form or report.

Logging On to Developer/2000

1. To log on to Developer/2000, go to Start Developer R2.1 and select Form Builder

(See Figure 8.1)


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Figure 8.1: The Start Menu for Logging in to Developer/2000

2. Immediately, you will see the window for Developer/2000 Form Builder for Windows

95/NT with the sub-window for Welcome to Form Builder. (See Figure 8.2)


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Figure 8.2: The Form Builder window

3. Select 'Use the Datablock Wizard' and click OK--This is the easiest method to design anew form.

4. You will now see the Welcome to the Datablock Wizard Window. Click Next to proceed.(See Figure 8.3)


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Figure 8.3: Welcome to Datablock Wizard Window

5. You will now see the window for the Datablock Wizard. Select Table or View as in thefigure and click Next. (See Figure 8.4)

Figure 8.4: The Datablock Wizard Window


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6. You will now see the window that prompts you to select a table or a view--your form will

be created based on this selection. Since no table or view is being shown, click on browseto look at the list of tables and views in your database. (See Figure 8.5)

Figure 8.5: The window for selecting the base table

7. Once you click browse, the connect window will appear. Type in your username,

password and database to connect to the database. (See Figure 8.6)


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Figure 8.6: The Connect String Window

(We typed "server" in the Database field because our data resides on a central server. Ifyour data resides on your personal hard drive, this field can be blank.)

Lesson 8, page 2

8.

You will now see the tables window. Select current users and tables and click OK. (SeeFigure 8.7)


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Figure 8.7: The Tables Window

9. You will now see the list of tables created in your database. Select Students and click

OK. (See Figure 8.8)

Figure 8.8: The window with the list of tables in the database

10.You will now see your selected table and its available columns on your screen. Click on

the single right arrow to select the first column to be shown in your form; in this case the


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STUDID column. You will now see this column under the database items selected sub-

window. (See Figure 8.9)

Figure 8.9: The window with the selected table and its available columns.

11.To move the rest of the columns, simply click on the double right arrow and this willselect all your columns in to the database items. (See Figure 8.10)


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Figure 8.10: The Database Wizard Window with all the selected columns of the base

table

12.You will now see the Congratulations window. Make sure that "Create the data block,

then call the Layout Wizard" is selected and click on Finish. (See Figure 8.11)


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Figure 8.11: The Data Block Wizard Congratulations Window

13.You will now see the Layout Wizard, prompting you to select the items that you would

like to show in the form. Make sure that the data block selected is Students and then clickthe double right arrow to move all the columns of the Student block from the available

items to the displayed items. Click on Next to continue. (See Figure 8.12)


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Figure 8.12: The Layout Wizard Window

14.The window with the prompt for the height and width of the items will appear. ClickNext to accept the default values. (See Figure 8.13)

Figure 8.13: The window displaying the height and width of the items selected


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Lesson 8, page 3

15.The Layout Wizard will now prompt you to select the layout or view style of your block.

Select Form and click Next. (See Figure 8.14)

Figure 8.14: The window for selecting the layout style of the selected table

16.The Layout Wizard will now prompt you to select a title for the form that you arecreating. Type in Student Records. Click Next to continue. (See Figure 8.15)


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Figure 8.15: The Window for selecting the appropriate title for the Form

17.Congratulations! You have now successfully created your first form. Click Finish to view

your form. (See Figure 8.16)

Figure 8.16: The Layout Wizard Congratulations Window


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18.You will now see the canvas view of the form that you have created. You can now add

various objects like push buttons, combo boxes and radio buttons to your form to make itmore graphical and user friendly. We will do this in the next lesson. (See Figure 8.17)

Figure 8.17: The canvas view of the newly created form

19.You can now format the form manually. Click on the frame to select it. Then drag theframe to make it bigger. (See Figure 8.18)


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Figure 8.18: Formatting the size of the frame

20.You can now space out the data fields to make your form more visually appealing. You

can do this by simply selecting the data field and dragging it to your desired area. (See

Figure 8.19)


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Figure 8.19: Spacing out the data fields

21.After you have formatted all the data fields, your form should look like Figure 8.20.


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Figure 8.20: The formatted form

Lesson 9

In this lesson you will learn how to create an end-user interface and add more functionality to the

basic form that we created in Lesson 8. Specifically, this will involve:

Creating LOVs, or List of Values, where you will connect your form to another table

from which the users make their selections

Creating Radio Buttons

Creating Combo Boxes and Poplists

Creating Push Buttons

Adding triggers to the Push Buttons for inserting, deleting and retrieving records

List of Values (LOVs)

1. In this form we are designing, we will create a List of Values for major, so that the usercan select a major from the list. To do this, first we will have to create table called

Major_List.2. To do this, go to SQL*Plus and type the following code at the SQL prompt

SQL> CREATE TABLE MAJOR_LIST2 (MAJOR VARCHAR2(20));


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3. Now type in the following statement to insert more data into the Major_list table:

SQL> INSERT INTO MAJOR_LIST VALUES ('Accounting');

SQL> INSERT INTO MAJOR_LIST VALUES ('Info. Systems');

SQL> INSERT INTO MAJOR_LIST VALUES ('Marketing');

SQL> INSERT INTO MAJOR_LIST VALUES ('Finance');SQL> INSERT INTO MAJOR_LIST VALUES ('Decision Sciences');

4. Now, type in Select * from Major_List to view your newly created table and its records.

(See Figure 9.1)

Figure 9.1: Creating table Major_List in SQL*PLUS

5. First, select LOV in the Object Navigator on Developer/2000 and click on the "+" sign on

the toolbar to your left. (See Figure 9.2)


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Figure 9.2: Creating a new LOV

6. Immediately, the window for the new LOV will pop up. (See Figure 9.3)

Figure 9.3: The New LOV Window


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7. Type in the following Select statement in the window to connect the new LOV to the

Major_List table that we created earlier and click OK. (See figure 9.4)

Figure 9.4: The New LOV Window with the select code

select major into :studblock.major from major_list order by major;

8. Once you click OK, you will come back to the Object navigator window. Now, name the

LOV as MAJOR_LOV by double clicking the word LOV. (See Figure 9.5)


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Figure 9.5: Changing the name of the LOV

9. Now go back to the Canvas View by clicking on the small picture icon just beneath the

word Canvases in the Object Navigator. (See Figure 9.6)


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Figure 9.6: Returning to the Canvas view

10.In the Canvas View, we will create a push button and position it right beside the Major

data field. To create the push button, select the box like icon from the toolbox, click on it

once and drop it beside the Major data field. (See Figure 9.7)


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Figure 9.7: Creating a push button to place it beside the Major data field

11.After the push button has been created, then right click on the button and select Property

Palette from the list that pops up. (See Figure 9.8)


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Figure 9.8: Selecting Property Palette for the Push Button

12.Once you are in the Property Palette, remove the label, specify Iconic as Yes and in theicon Filename type Down. Click on the close button in the lower taskbar located on the

upper right corner. (See Figure 9.9)


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Figure 9.9: The Property Palette for the Push Button

13.You will now return to Canvas View. Your Canvas will now look like Figure 9.10.


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Figure 9.10: The Canvas View with the Push Button for the LOV

14.Now back in the canvas, right click on push and this time select the PL/SQL Editor. (See

Figure 9.11)


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Figure 9.11: Selecting the PL/SQL Editor of the Iconic Button

Lesson 9, page 2

15.In the PL/SQL Editor we will write a trigger that will connect this button to the table

called Major_List, so that when the user clicks on the button they will be able to view the

list of options. When you select the Pl/SQL Editor, the window for the new triggerselection will appear. (See Figure 9.12)


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Figure 9.12: The Window with the list of triggers available to the user

16.We will write a When-Button-Pressed trigger, since we would like the code to be

activated when the user presses the button. Scroll down and select When-Button-pressedtrigger. (See Figure 9.13)

Figure 9.13: Selecting the When-Button-Pressed trigger

17.Immediately, you will see the PL/SQL Editor window. (See Figure 9.14). Type in the

following code in the blank space in the Editor.


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Declare

Return_LOV Boolean;

Begin

Return_LOV :=show_LOV('Major_LOV');End;

18.

Figure 9.14: The PL/SQL Editor window19.After typing in the code, click compile on the upper left-hand corner of the window. (See

Figure 9.15)


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Figure 9.15: The Window for the PL/SQL Editor with the code for the LOV

20.To test how the button works, you can view the form by returning to the Canvas View

and selecting Run Form from the Program menu. (See Figure 9.16)


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Figure 9.16: Selecting Run Form from the Program menu

21.When the form is running, type in an ID number in the STUDID field (there has to be

data in the primary field). Then click the button with the down arrow. The list of majors

will pop up. (See Figure 9.17). To return to the canvas View, simply click OK in the list

of majors and click the close button in the upper right taskbar.


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Figure 9.17: The List of values for the Majors

Lesson 9, page 4

35.We will now create three push buttons and write triggers for each button. To create apush button, select the button icon from the palette on the left of the canvas and drop in

the lower part of the form. (See Figure 9.30)


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Figure 9.30: Selecting a push button

36.We will change the label of the first push button in the property palette to "Retrieve." To

do this, right click on the button and go to its Property Palette. (See Figure 9.31).


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Figure 9.31: Selecting the Property Palette for the push button

37.Now select the PL/SQL editor by right clicking on the push button. (See Figure 9.32).


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Figure 9.32: Selecting the PL/SQL Editor for the push button

38.Select the WHEN-BUTTON-PRESSED-TRIGGER, insert the following PL/SQL code in

the blank space of the editor and then click Compile.

beginselect studid, studname, ftpt_status, sex, start_sem, start_year, major

into :studblock.studid, :studblock.studname, :studblock.ftpt_status,

:studblock.sex, :studblock.start_sem, :studblock.start_year, :studblock.majorfrom student

where studid = :studblock.studid;

exception

when no_data_found thenmessage ('Invalid Student Id:Please enter a valid Id.');

raise form_trigger_failure;

end;

39.In the above code, we are writing a select statement for retrieving the record of a studentwith any particular student ID. If no data is found on a particular student ID, then

Developer/2000 will give an error message and raise the form_trigger_failure trigger.

Run the form and type in a invalid STUDID to check the message. (See Figure 9.33)


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Figure 9.33: Error Message when invalid Student ID is entered by the user

In a similar manner, create two other buttons, totaling three push buttons.

40.Go to the second push button, right click on it and go to its property palette. Change its

label to Insert. Now come back to the Layout Editor, right click again on the push buttonand go to its PL/SQL Editor. In it, write the following code in the When-Button-Pressed

trigger:

Commit;

Clear_Form;

41.Label the third push button as Clear. At the When-Button-Pressed Trigger, write the

following code:

Clear_Form;


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42.Now go back to the Canvas View and Program Run Form to view your form with the

three push buttons. (See Figure 9.34)

Figure 9.34: The Form with the three Push buttons

Lesson 10

In this lesson, you will learn how to:

Create Alerts (a modal window) on a push button that will function as a warning or a

message to the users when they click the button.

Create Procedures which are stored blocks of code which can be called from multiple

objects saving the time taken for retyping codes

Creating an Alert

1. Go to Alerts in the Object Navigator and double click on it. (See Figure 10.1)


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Figure 10.1: Creating a New Alert

2. Double click on the newly created alert and name it DELETE_ALERT. (See Figure 10.2)

Figure 10.2: Changing the name of the new Alert

3.

Now double click on the alert and you will immediately go to its Property Palette. In theproperties:

Change the title of the alert to Delete Alert

Type in the message as "Are you sure you want to Delete?"

Select Stop as the Alert style

You can add a third button to the alert or just keep the OK and Cancel

Make sure that Button1 is selected as the default button


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(See Figure 10.3)

Figure 10.3: The Property Palette for the Alert

4. To activate the alert, we will create a procedure which we will call from the delete button.

To add a procedure, go to the Object Navigator and double click on Program Units.Immediately the window for the new Program unit will appear. (See Figure 10.4)


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Figure 10.4: Creating a new Program Unit

5. In the window for the new Program Unit, type in the name as Display_Delete-Alert.

Make sure that procedure is selected as the type of Program Unit and click OK. (See

Figure 10.5)

Figure 10.5: Naming the new Program Unit

6. Once you click OK, you will be automatically taken to the PL/SQL Editor window. (See

Figure 10.6)


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Figure 10.6: The PL/SQL Editor window for the new Program Unit

7. In the PL/SQL Editor, type in the following code for activating the alert. You may have

to delete a couple of lines from the Editor to avoid duplication. In this code, we will

declare a number variable called return_alert. We will then set it to show the alert that wecreated earlier in this lesson called Delete_Alert. We will then write a simple if/then

statement, such that if the user clicks on OK, which is alert button 1, then

Developer/2000 will perform the deletion and commit the changes. Otherwise, it will exitthe alert window and help the users decide on their action. (See Figure 10.7 to get a view

of the code as it should look in the PL/SQL editor. Do not forget to compile.)

PROCEDURE Display_Delete_Alert IS

return_alert NUMBER;BEGIN

return_alert := show_alert ('DELETE_ALERT');

if return_alert = alert_button1 thencommit;else

rollback;

end if;

END;


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8.

Figure 10.7: The code for activating the alert9. We will now add a push button to the form and then add the above procedure to it, so that

whenever the user clicks on delete, the alert will be shown. To do this, go the Layout

Editor and add a push button to the form, go its properties, andchange the label to Delete

(use the steps used to create a push button in Lesson 9). Now go to its PL/SQL Editor byright clicking on the push button. (See Figure 10.8)


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Figure 10.8: Selecting the PL/SQL Editor for the Delete button

10.At the When-Button-Pressed trigger in the PL/SQL Editor, write the following code:

delete from student where studid = :studblock.studid;delete_record;

Display_Delete_Alert;

11.The last line of the code will call the previously created procedure Display_Delete_Alertand activate the alert whenever the user clicks on the delete button. The first two lines of

code delete the record for any particular student ID. (See Figure 10.9 to get a view of the

alert when the user clicks the delete button).


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12.

Figure 10.9: The fully functional form with the alert on the Delete button

Tutorial for Forms 6i

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