chapter 6, part 2 database system development (cont.) based on g. post, dbms: designing &...
TRANSCRIPT
Chapter 6, part 2
Database System Development (cont.)
Based on G. Post, DBMS: Designing & Building Business Applications
University of ManitobaAsper School of Business
3500 DBMSBob Travica
Updated 2015
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Complex Controls Used on Forms
Examples: Tab Grid Calendar Gauge Slider Spin Box
Tab
Grid
Gauge Slider Spin box
Calendar
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Linking Forms
Customer
FirstName: Mary
LastName: Jones
Address: 123 Oaxaca Ave.
City: Los Angeles
ZipCode: 90086
Gender: Female
Age: 20
AccountBalance: $150
Sale
CustomerFirstName: MaryLastName: JonesAddress: 123 Oaxaca Ave.
Animals Purchased
Merchandise
EditEdit
Using forms for the output by linking them.
Button triggers query for the customer record
Subforms
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Complex Inputting via Forms – Flow and Calculations
Linking via forms object collection:
Forms ! [Form Name] ! [Control]
AnimalID is passed from Animal form to
Sale form
Subtotals and subforms Calculate subtotal in subform ItemsSold Pass the result of calculation (Subtotal) to main
form Sale (Forms![MainForm]![SubForm].Form![Control])
Add more calculations on main form
(Tax, Order Total)
AnimalAnimalID
Sale=Forms!Animal!AnimalID
- - - - - - -Subtotal=Sum(Price*Quantity)
=Forms!Sale!ItemsSold.Form!Subtotal
ItemsSold
=Subtotal*[TaxRate]
Subtotal
Tax
=Subtotal+TaxOrder Total
Task: Start sale while querying an animal record.
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Forms and Integrity
Avoid relying on forms for integrity Set integrity conditions in table definitions
Be sure to set referential integrity (relationships)
Use forms for input validation – contribution to data integrity
Main purpose of form: Use forms to increase usability of user interface (ease of use,
efficiency):
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International Attributes
Language Character sets and punctuation marks Sorting Data formats
Date Time Metric vs. Imperial system Currency symbol and format Separators (decimal, . . .) Phone numbers
Separators International code prefix
Postal codes National ID Numbers
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Direct Manipulation of Graphical Objects
Ease data input for end-users: Drag and drop objects (blue arrows).
Tabby
Brown Lab
Current Choices
Kennel/OrdersBird
Cat
Dog
Spider
Fish
Mammal
Reptile
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Creating a Graphical Approach
Get the hardware. Scanners, Microphone and Sound card, Camera
Lots of disk space.
High speed processors.
Design: Add an object column to your table definition.
Avoid using graphics just for show.
Double-click, drag-and-drop as manipulation methods
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Reports
Security concerns: Distribution lists & secure
lines Numbering each report Concealed/non-printed
content Secure printers Transmission limits Print queue controls
Core of system development Electronic, but can also be
printed on paper. Database + queries & reports
= TPS; TPS + more elaborate reports
= MIS, reports define MIS How often is report
generated? Events that trigger report?
(time - regular, by user – exception reports)
Size of report? Copies? Colors?...
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Paper Report Terminology
Page Layout Landscape v. portrait Margins Gutter (binding space)
Typefaces Serif (Times New Roman) Sans-serif (Arial, Verdana) Fixed width
Font size common: 10-12 point
Facing pages (portrait)
guttermargins
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Paper/Electronic Report Types: Tabular
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Electronic Report Types: Group
Organizing report around a certain attribute Example: Column Order with associated Items
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Electronic Report Design View
Ideas of hierarchy and
nested structuring… Report Header Page Header Group Header1
Group Header2 . . .Detail . . .
Group Footer2 Group Footer1 Page Footer Report Footer
More…
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Electronic Report Design Terminology
Group Footer Subtotals for the group.
Page Footer Printed at the bottom of
every page--page totals or page numbers and notes.
Report Footer Printed one time at the end
of the report. Summary notes, overall totals and graphs for entire data set.
Report Header Title pages that are printed
one time for entire report.
Page Header Title lines or page notes that
are printed at the top of every page.
Group Header Data for a group (e.g.,
Order) and headings for the detail section.
Detail Innermost data.
More…
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Report of Orders
Rpt footer: graph Orders by Customer
Group1: CustomerH1: Customer name, address, …
F1: Customer total orders:
Group2: OrderH2: Order#, Odate, Salesperson.
F2: Order total: Sum(Extended)
Detail: Item#, Qty, Extended
Electronic Report Design – Groups
Groups used for 1:M relationships.
Use a query to join all necessary tables. Can include all columns. Use query to create
computed columns (e.g., Extended:Price*Quantity).
Each one-to-many relationship becomes a new subgroup.
Customer(C#, Name, …) Order(O#, C#, Odate, …) OrderItem(O#, Item#, Qty, …)
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Report Computations
Query does: Some row computations. Extended Price = Price*Quantity
Report does: Totals of grouped records. Page and report totals. Other computations: commission = rate * total Scope depends on location
Group footer: subtotalPage footer: page totalReport footer: report total
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Graphs in Reports Graphs
Separate query needed. Detail
Locate in detail or group footer section.Avoid aggregation and groups in query. Include column that links to detail query in
report.
Subtotals and totalsTypically located in report footer or header.Compare group totalsRelies on Group By and aggregation.Be sure query groups match report groups.
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Graphs From Queries
Build a query that generates
the data to be graphed.
Numeric data
Columns to link to form.
Summary chart--unlinked.
Sale 1
Sale 2
Sale 3
Merchandise
Merchandise
Merchandise
Animal
Animal
Animal
Total SalesMerchandise
Animals
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Graph for Groups
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