1. SOEN 343 Software Design
Computer Science and Software Engineering Department
Concordia University
Fall 2004
Instructor: Patrice Chalin

2. Agenda – Lecture 7a Review & renew. Data Source Patterns
Exercise set 6
12/5/2018
SOEN 343, © P.Chalin,

3. Opening Remarks Did I mention that … … there will be an exercise set.
12/5/2018
SOEN 343, © P.Chalin,

4. Enterprise Application Patterns
Page Controller
Template View
Presentation
Front Controller
Transform View
Transaction Script
Domain Model
Domain
Active Record
Row Data Gateway
Data Mapper
Data Source
Table Data Gateway
12/5/2018
SOEN 343, © P.Chalin,

5. Presentation Domain Data Source Data Source Patterns Page Controller
Template View
Presentation
Front Controller
Transform View
Transaction Script
Domain Model
Domain
Active Record
Row Data Gateway
Data Mapper
Data Source
Table Data Gateway
12/5/2018
SOEN 343, © P.Chalin,

6. Data Source Patterns Hide SQL. Provide an abstraction for
One data row.
A collection of data row(s).
12/5/2018
SOEN 343, © P.Chalin,

7. Example: Person-Grade Table
Table attributes:
name : String
grade : int
name
grade
12/5/2018
SOEN 343, © P.Chalin,

8. Table Data Gateway PersGrade TDG find(name) : ResultSet
findInRange(fg,tg) : ResultSet
insert(name,grade)
update(name,grade)
delete(name)
No fields.
Find methods return ResultSet
12/5/2018
SOEN 343, © P.Chalin,

9. Table Data Gateway: Find Code
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SOEN 343, © P.Chalin,

10. Table Data Gateway: FindInRange
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SOEN 343, © P.Chalin,

11. Row Data Gateway PersGradeRDG - name : String - grade : int
find(name) : PersGradeRDG
insert() : void
update() : void
delete() : void
… getters and setters …
Fields – table columns.
Finder methods: static.
insert, update, delete on instance.
12/5/2018
SOEN 343, © P.Chalin,

12. Row Data Gateway: Find Code
12/5/2018
SOEN 343, © P.Chalin,

13. Active Record (Row Data Gateway)
PersGrade AR
name : String
grade : int
find(name)
… // like RDG
delete()
// Can also have domain logic
getRank()
12/5/2018
SOEN 343, © P.Chalin,

14. Exercise Set 6
12/5/2018
SOEN 343, © P.Chalin,

15. Server-web.xml-servlet
12/5/2018
SOEN 343, © P.Chalin,

16. 12/5/2018
SOEN 343, © P.Chalin,

17. RDG & TDG
12/5/2018
SOEN 343, © P.Chalin,