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Week 11
April 12
• Lexical Reference Variables in Graphics and
List Box in Forms
R. Ching, Ph.D. • MIS Area • California State University, Sacramento
Hard-Coded Values
Will only show one year
No flexibility
R. Ching, Ph.D. • MIS Area • California State University, Sacramento
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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
• Assign an initial value
R. Ching, Ph.D. • MIS Area • California State University, Sacramento
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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
R. Ching, Ph.D. • MIS Area • California State University, Sacramento
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In Graphics Builder
R. Ching, Ph.D. • MIS Area • California State University, Sacramento
Create a Lexical Reference Variable
Select Parameters and the create tool in the tool palette
R. Ching, Ph.D. • MIS Area • California State University, Sacramento
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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.
R. Ching, Ph.D. • MIS Area • California State University, Sacramento
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Using the Lexical Reference Variable
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Replace with the lexical reference variable
Replace the column name with the lexical reference variable
R. Ching, Ph.D. • MIS Area • California State University, Sacramento
Using the Lexical Reference Variable
Alias must be used
Click Apply to test the syntax and OK to close the window
R. Ching, Ph.D. • MIS Area • California State University, Sacramento
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In Form Builder
R. Ching, Ph.D. • MIS Area • California State University, Sacramento
Create the List Item
Click on the list item tool in the tool palette and
draw the list item on the canvas
R. Ching, Ph.D. • MIS Area • California State University, Sacramento
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Populate the List Item
Right-mouse click on the list item (e.g., LIST10)
and select the Property Palette
R. Ching, Ph.D. • MIS Area • California State University, Sacramento
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Populate the List Box
Must correspond
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1. Select the
Elements in List
property, enter
the elements
Value
associated and values,
with the list click on OK
element
2. Assign an Initial Value (set to blank)
R. Ching, Ph.D. • MIS Area • California State University, Sacramento
Navigator
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Block name
Chart item name
(Remember these names)
List item name
R. Ching, Ph.D. • MIS Area • California State University, Sacramento
Program the Push Button
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Right-mouse click on the push button and select PL/SQL Editor
R. Ching, Ph.D. • MIS Area • California State University, Sacramento
Programming the Push Button
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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
See next slide
append it to the literal
(“sum(sales…”)
R. Ching, Ph.D. • MIS Area • California State University, Sacramento
Programming the Push Button
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See next slide
Assigns the variable revenue_year
to the lexical reference variable,
p_rev_column
R. Ching, Ph.D. • MIS Area • California State University, Sacramento
block3.d_caption
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R. Ching, Ph.D. • MIS Area • California State University, Sacramento
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R. Ching, Ph.D. • MIS Area • California State University, Sacramento
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R. Ching, Ph.D. • MIS Area • California State University, Sacramento