Transcript Oracle HTMLDB introduction

Oracle HTMLDB introduction
Oracle HTMLDB introduction
CERN Oracle Developers Forum: May 12th 2005
1/16
IT-AIS-HR Giovanni Chierico
Oracle HTMLDB introduction
What is HTMLDB
• A rapid web application development tool
for the Oracle database.
• 100% web based development
• PL/SQL driven
2/16
IT-AIS-HR Giovanni Chierico
Oracle HTMLDB introduction
Architecture
Everything is in the Database!
RDBMS
HTMLDB
WebServer
Client
3/16
IT-AIS-HR Giovanni Chierico
Oracle HTMLDB introduction
Pros & Cons
Pros
•
•
•
•
•
•
•
•
•
Fast development
100% web based
No code required
Ready to use components
Professional looking
Easy to create mock-ups
Easy to deploy
Easy to understand
Fast (no overhead)
Cons
•
•
•
•
•
Platform lock
Difficult to debug
Tricky to customize
Scaling problems
Difficult version control
4/16
IT-AIS-HR Giovanni Chierico
Oracle HTMLDB introduction
Trade Off Comparison
Effort
Good for small/simple projects
J2EE
HTMLDB
?
Results
5/16
IT-AIS-HR Giovanni Chierico
Oracle HTMLDB introduction
Designer Comparison
• HTMLDB is not a replacement for
Designer
• Lacks the “design” part
• Targets Web Apps
• The layout is a lot more flexible
• Doesn’t have any “compile” phase
6/16
IT-AIS-HR Giovanni Chierico
Oracle HTMLDB introduction
Real World Examples
• http://htmldb.oracle.com/references
• AskTom
• CERN AIS
– Pre Registration Tool
– Safety Information Registration
– Core Training Application
• HTMLDB Itself!
7/16
IT-AIS-HR Giovanni Chierico
Oracle HTMLDB introduction
Development Cycle
Developer
RDBMS
HTMLDB
Web Interface
HTMLDB Engine
User
Web
Application
Application
Metadata
8/16
IT-AIS-HR Giovanni Chierico
Oracle HTMLDB introduction
HTMLDB Interface
Application Builder
•Create pages
•Manage shared components (Items, Templates, Translations, …)
•Import & Export application
SQL Workshop
•Browse DB Objects (Tables, Packages, DBLinks, Java Classes, …)
•Create DB Objects
•Run arbitrary SQL
Data Workshop
•Import/Export Data from/to XML/Spreadsheet
9/16
IT-AIS-HR Giovanni Chierico
Oracle HTMLDB introduction
Page Creation: Overview
Request
Page
Pre-processing
Client
Rendering
Order can be finely
tuned mixing processing
and rendering.
Post-processing
Branching
Same or other Page
10/16
IT-AIS-HR Giovanni Chierico
Oracle HTMLDB introduction
Page Creation: Rendering
User Interface
Items
Data Loading
PL/SQL
Repository
Input Text
Checkbox
Report
Every Item corresponds to a “global” variable
11/16
IT-AIS-HR Giovanni Chierico
Oracle HTMLDB introduction
Processing & Branching
Processes
Computations
•execute PL/SQL
Set “item” values
•manage sessions state
•SQL or PL/SQL driven
•Reports pagination
•Static values
•Many others …
•Other item values
Branches
•Application Page
•External URL
•Functions returning URL/page
•Others …
12/16
IT-AIS-HR Giovanni Chierico
Oracle HTMLDB introduction
Example: Room Booking
Use Cases
• Search for first available time slot
• Book desired time slot
• Show room availability
13/16
IT-AIS-HR Giovanni Chierico
Oracle HTMLDB introduction
Conclusions
•
•
•
•
Fast implementation
Good looking results
Good for small to medium applications
It takes some time to get used to it
14/16
IT-AIS-HR Giovanni Chierico
Oracle HTMLDB introduction
Resources
• Official Oracle Page
http://www.oracle.com/technology/products/database/htmldb/index.html
• Good support forum
http://forums.oracle.com/forums/forum.jsp?forum=137
• AskTom
http://asktom.oracle.com/
• Newsgroups
comp.databases.oracle.tools
15/16
IT-AIS-HR Giovanni Chierico
Oracle HTMLDB introduction
Questions?
16/16
IT-AIS-HR Giovanni Chierico