1. Lexical Reference Variables in Graphics and List Box in Forms
Week 11 April 12
Lexical Reference Variables in Graphics and List Box in Forms

2. Hard-Coded Values
Will only show one year
No flexibility

3. A Few Simple Steps In Graphics Builder… Create a user parameter
Assign an initial value
Modify the data model
Insert the lexical reference variable into the query
In Forms Builder
Create a list item
Populate the list box

4. A Few Simple Steps (cont.)
Create a push button to launch the graph in the chart item
Program the push button in PL/SQL
Create a paramlist variable
Concatenate the list item’s value to the text for the column name to form a text string
Add the text string to the parameter list
Open the graph
Run the form

5. In Graphics Builder

6. Create a Lexical Reference Variable
Select Parameters and the create tool in the tool palette

7. Assign a Name and Initial Value
Assign entries into the Name and Initial Value dialog boxes.
Be sure the Type is character (char). Click OK.

8. Using the Lexical Reference Variable
Replace with the lexical reference variable
Replace the column name with the lexical reference variable

9. Using the Lexical Reference Variable
Alias must be used
Click Apply to test the syntax and OK to close the window

10. In Form Builder

11. Create the List Item
Click on the list item tool in the tool palette and draw the list item on the canvas

12. Populate the List Item
Right-mouse click on the list item (e.g., LIST10) and select the Property Palette

13. Populate the List Box
1. Select the Elements in List property, enter the elements and values, click on OK
Must correspond
Value associated with the list element
2. Assign an Initial Value (set to blank)

14. Navigator (Remember these names) Block name Chart item name
List item name

15. Program the Push Button
Right-mouse click on the push button and select PL/SQL Editor

16. Programming the Push Button
Create a parameter list (runlist)
If nothing is selected from the list box
Take the year (i.e., last 2 digits) from the list box and append it to the literal (“sum(sales…”)
See next slide

17. Programming the Push Button
See next slide
Assigns the variable revenue_year to the lexical reference variable, p_rev_column

18. block3.d_caption