use the power of apex dictionary views to increase the quality of your apex applications
DESCRIPTION
Since Oracle Application Express 2.2, all metadata defining your applications are exposed by means of the (new) data dictionary views. This opens perspectives to set-up your own Quality Control System to enhance the development process. When starting the development of a new application, one of the first actions you always do is set up naming conventions, coding standards and best practices. This paper will explain how to increase the overall quality of your application by verifying the compliancy of your development team’s work to those outlined standards. Those checks can be implemented by queries against the apex repository views visualized in a custom QA application ... developed in Apex of course. (created by iAdvise)TRANSCRIPT
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Karen Van Hellemont Jan Huyzentruyt Your Oracle Solutions Partner
Use the Power of APEX Dictionary Views to Increase the Quality of Your APEX Applications
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Agenda
• Our Company iAdvise • Apex Development Approach • Increasing the Quality of Apex Applications
– Apex Development Standards – The Basic Idea – From Basic Idea to Custom Apex QA System
• Conclusion
Age
nda
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Agenda
• Our Company iAdvise • Apex Development Approach • Increasing the Quality of Apex Applications
– Apex Development Standards – The Basic Idea – From Basic Idea to Custom Apex QA System
• Conclusion
Age
nda
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Who is iAdvise? O
ur C
ompa
ny iA
dvis
e Located in Belgium
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Who is iAdvise?
• Started in 2004 • Member of The Cronos Group • Oracle-based solutions • 50 Oracle specialists today • Turnover of € 4.500.000 (± $ 7.000.000) • End 2007 – O2U in The Netherlands
Now 15 consultants
Our
Com
pany
iAdv
ise
Cronos is
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How do we work? • Stress on people
– Mix of young potentials and experienced “coaches” – Maximum training, close follow-up – Knowledge sharing!
• Finding the equilibrium between solutions and technology
• Initiatives to stay ahead – Certified consultants – Competence centers with “core” teams – Fusion Regional Director – Seminars and sessions at Oracle events – Oracle Blog
Our
Com
pany
iAdv
ise
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Our
Com
pany
iAdv
ise
How do we work?
RAD Race 2007-2008
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Competence Centers
Oracle Platform
Classic Development • SQL, PL/SQL • Designer • Forms • Reports
New Technology • APEX development • Java - J2EE, OC4J, frameworks
• SOA, BPEL, BAM • WebCenter
Infrastructure • Oracle AS Admin • Monitoring, Tuning • Hosting
Datawarehouse & BI • Architecture and design • ETL – OWB, ODI • BI Suite (Dashboard, Answers)
Additional Services • Oracle Portal Development
• High Level Consultancy • Oracle Licenties
Our
Com
pany
iAdv
ise
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Agenda
• Our Company iAdvise • Apex Development Approach • Increasing the Quality of Apex Applications
– Apex Development Standards – The Basic Idea – From Basic Idea to Custom Apex QA System
• Conclusion
Age
nda
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• Reason 1: – Every company is looking for a custom project and
development approach – Main Objective is:
“Reach the desired result in the fastest and best possible way without exceeding the budget and with an acceptable quality level” A
pex
Dev
elop
men
t App
roac
h Apex Development Approach
Why?
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• Reason 2: – The entrance level for learning Apex is very low – A lot of our junior developers get their first project
experience in an Apex context
“There is a need for supervision and guidance”
Apex Development Approach
Why?
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Apex Core Team
• With Apex as development tool you can realize projects – At a good price – Within an aggressive time frame
• Apex Core team: young people – Talented – Motivated – Enthusiast – Full of energy
Ape
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evel
opm
ent A
ppro
ach
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Apex Core Team
• But they need guidance + supervision
• One tries to equip project team members with tools & techniques
• Create a development workplace to efficiently pilot and control the development process
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Looking for a standard way of working based on:
Project Methodology
Project Workplace
Project Workplace A
pex
Dev
elop
men
t App
roac
h
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A typical project workplace looks like a workbench where all necessary materials are available
Project Workplace A
pex
Dev
elop
men
t App
roac
h
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Pan-Ora-Mix
• Started an internal project • Code-name “Pan-Ora-Mix”
“Brings together all kinds of Oracle knowledge spanning several years of Apex project experiences and blend it together to a magic potion…”
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Pan-Ora-Mix
• Sample apex applications – Packaged applications that can be downloaded from http://
apex.oracle.com – Applications already built by iAdvise
• Add-ons and toolsets – pGen4O (PL/SQL Generator) – IAF (reusable components for Apex) – xTra4o (Xliff Translator): http://www.iadvise.be/xtra4o – BiP4Apex (Application document generator via BiP) – Qa4o (QA Check)
• Tips, guidelines, standards, best practices
Ingredients of that magic potion are:
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Agenda
• Our Company iAdvise • Apex Development Approach • Increasing the Quality of Apex Applications
– Apex Development Standards – The Basic Idea – From Basic Idea to Custom Apex QA System
• Conclusion
Age
nda
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• At the beginning of a new Apex-project some development standards are needed, like – Coding style conventions – Naming conventions
• Originally we used a standard form, but – How can you check that these standards are
followed? • A more automated approach is needed
Ape
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tand
ards
Apex Conventions
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Ape
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evel
opm
ent S
tand
ards
Convention Checklist
Example of a Convention Checklist
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DEMONSTRATION
Manually checking development standards using the convention checklist
Convention Checklist A
pex
Dev
elop
men
t Sta
ndar
ds
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Agenda
• Our Company iAdvise • Apex Development Approach • Increasing the Quality of Apex Applications
– Apex Development Standards – The Basic Idea – From Basic Idea to Custom Apex QA System
• Conclusion
Age
nda
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Apex stores all the metadata of the application in a repository within the database, owned by the FLOWS_xyz schema. Tables in the FLOWS-schema are not public and are not quite “readable”.
Since Apex 2.2 Oracle implemented a more accessible layer: the so-called Apex repository views. They are recognizable by the prefix ‘APEX_’ and are all made public.
With the release of Apex 3.0, the views are also documented within the tool (see Home> Utilities> Apex Views). Th
e B
asic
Idea
The Apex Repository
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The
Bas
ic Id
ea
The Apex Repository
Apex Dictionary Tree View
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• Apex dictionary views can be grouped in different areas • Everything a developer “programs” can be queried
via those APEX_APPLICATION_xxx views
= Basic foundation to set-up a Quality Assurance System for controlling whether the development standards are
respected The
Bas
ic Id
ea
The Apex Repository
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• Step 1: We write queries on the Apex dictionary views which contain development standards
• Example 1: – We want to find regions that are not based on the
template “Reports Region” – Therefore we query the view
APEX_APPLICATION_PAGE_REGIONS and look at the template column
The
Bas
ic Id
ea
Step 1: Writing Queries
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The
Bas
ic Id
ea
Step 1: Writing Queries SELECT xapg.page_id, xapr.page_name,
xapr.region_name,
xapr.source_type,
xapr.template as wrong_value,
xapp.application_id as apex_app_id
FROM apex_application_page_regions xapr
JOIN apex_application_pages xapg ON
(xapg.page_id = xapr.page_id AND
xapg.application_id = xapr.application_id)
JOIN apex_applications xapp ON xapp.application_id =
xapg.application_id
WHERE xapg.page_id <> 0 -- exclude page zero
AND xapr.source_type IN ('Report', 'Tabular Form', 'PL/SQL')
AND xapr.template NOT LIKE 'Reports Region'
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• Example 2: – We want to find regions where the pagination
scheme is different from “Row Ranges 1-15 16-30 in select list (with pagination)”
– Therefore we query the same view APEX_APPLICATION_PAGE_REGIONS and look at the pagination_scheme column
The
Bas
ic Id
ea
Step 1: Writing Queries
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The
Bas
ic Id
ea
Step 1: Writing Queries SELECT xapg.page_id, xapr.page_name,
xapr.region_name,
xapr.source_type,
xapr.pagination_scheme as wrong_value,
xapp.application_id as apex_app_id
FROM apex_application_page_regions xapr
JOIN apex_application_pages xapg ON
(xapg.page_id = xapr.page_id AND
xapg.application_id = xapr.application_id)
JOIN apex_applications xapp ON xapp.application_id =
xapg.application_id
WHERE xapg.page_id <> 0 -- exclude page zero
AND xapr.source_type IN ('Report', 'Tabular Form', 'PL/SQL')
AND xapr.pagination_scheme <> 'Row Ranges 1-15 16-30 in select list (with pagination)'
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• Step 2: – We assemble all quality check queries – We “UNION” them in our own QA-views
• Example: – We want one view that checks the correct template
and pagination scheme
The
Bas
ic Id
ea Step 2: Creating own QA-Views
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The
Bas
ic Id
ea
CREATE OR REPLACE VIEW QA_APEX_APP_PAGE_REGIONS AS SELECT …
FROM apex_application_page_regions xapr
JOIN …
WHERE …
AND xapr.template NOT LIKE 'Reports Region'
UNION
SELECT …
FROM apex_application_page_regions xapr
JOIN …
WHERE …
AND xapr.pagination_scheme <> 'Row Ranges 1-15 16-30 in select list (with pagination)'
Step 2: Creating own QA-Views
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• Step 3: – We place different checks in different groups – For each group we build a view, consisting of
different UNION’ed select statements – Within each group we define checks, corresponding
with a specific select against the apex repository
The
Bas
ic Id
ea
Step 3: Grouping Checks
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The
Bas
ic Id
ea
Step 3: Grouping Checks
Shortname Group QA View Name APR Application Page Regions QA_APEX_APP_PAGE_REGIONS APRC Application Page Rep
Columns QA_APEX_APP_PAGE_RPT_COLS
API Application Page Items QA_APEX_APP_PAGE_ITEMS APP Application Page
Processes QA_APEX_APP_PAGE_PROC
APV Application Page Validations
QA_APEX_APP_PAGE_VAL
Check Groups with Corresponding QA-Views
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The
Bas
ic Id
ea
Step 3: Grouping Checks
Check Points within each Check Group Group Identif. Code Quality Check APR APR-001 Wrong Reports Region Template APR APR-002 Wrong no_data_found_message APR APR-003 Wrong maximum_rows_to_query APR APR-004 Wrong pagination_scheme APR APR-005 Wrong enable_csv_output APR APR-006 Wrong report_null_value_as APR APR-007 No ORDER BY - No Default sort sequence APRC APRC-001 Wrong date format APRC APRC-002 Wrong Heading Alignment API API-001 Wrong date format in Date Picker API API-002 Date column NOT based on Date Picker APP APP-001 Verify (Length) PL SQL Source APP APP-002 No Process Error Message APV APV-001 Wrong error_display_location ... ... ...
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• Step 4: – We can now run our custom defined QA-views – The output shows the standards that aren’t
respected – Example: SELECT * FROM qa_apex_app_page_items
The
Bas
ic Id
ea
Step 4: Running Queries
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Step 4: Running Queries
Example: SELECT * FROM qa_apex_app_page_items
SQL Developer Output
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Agenda
• Our Company iAdvise • Apex Development Approach • Increasing the Quality of Apex Applications
– Apex Development Standards – The Basic Idea – From Basic Idea to Custom Apex QA System
• Conclusion
Age
nda
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• Time to give the queries to developers and code reviewers
• Choose an integrated user interface: Apex
Cus
tom
Ape
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A S
yste
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Visualize Checks via QA Appl.
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DEMONSTRATION
Checking development standards using our own QA-viewer
Convention Checklist C
usto
m A
pex
QA
Sys
tem
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• Two problems needed to be solved – If someone invents a new check we don’t want to
replace one of the views (DDL) – Different projects means different conventions, but
for new projects we don’t want to replace the views (DDL)
• Solution: we create our own small metabase
Cus
tom
Ape
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A S
yste
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The QA Metamodel
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• This metabase stores the driving data for the QA-application
• No DDL, but DML now Cus
tom
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The QA Metamodel
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• We added to our QA-Viewer an ADMIN tab where the driving metadata tables can be maintained – Check Groups – Check Points – Parameters
The metamodel in our QA-Viewer C
usto
m A
pex
QA
Sys
tem
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Maintain Check Groups C
usto
m A
pex
QA
Sys
tem
Maintain Check Groups
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Maintain Check Points C
usto
m A
pex
QA
Sys
tem
Maintain Check Points
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Maintain Parameters C
usto
m A
pex
QA
Sys
tem
Maintain Default Parameters
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• Different standards can exist for different apex-applications for the same customer
• Possible to store a different standard-value for a specific application (via APPLIED_PARAMETERS)
Cus
tom
Ape
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A S
yste
m Maintain Parameters
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Cus
tom
Ape
x Q
A S
yste
m Maintain Parameters
Maintain Application Specific Parameters
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DEMONSTRATION
Working with Check Groups, Check Points, Default Parameters and Application
Parameters
Convention Checklist C
usto
m A
pex
QA
Sys
tem
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Agenda
• Our Company iAdvise • Apex Development Approach • Increasing the Quality of Apex Applications
– Apex Development Standards – The Basic Idea – From Basic Idea to Custom Apex QA System
• Conclusion
Age
nda
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Conclusion
• Apex is the ideal tool to realize projects – with junior developers – at a good price – within an aggressive time frame – with an acceptable quality level
• You can increase the quality of your applications by the power of the dictionary views
• iAdvise has built his own QA-Viewer
Con
clus
ion
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Questions and Answers Q
uest
ions
and
Ans
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