FlexCamp London

Marco Casario CTO – Comtaste http://casario.blogs.com

Who I am FlexCamp London
CTO of Comtaste , RIA Development, Consulting and Training firm
www.comtaste.com
My Books
AIR Cookbook
Flex Solutions: Essential Techniques for Flex 2 and Flex 3 Developers
Advanced AIR Applications
My Blog and my contacts
http://casario.blogs.com
http://blog.comtaste.com

AIR Cookbook Cook-off FlexCamp London
Qualify for the Adobe AIR Cookbook Cook-off contest to celebrate the upcoming publication of the Adobe AIR Cookbook .
Submit your best solutions to common AIR coding challenges for a chance to win:
One pass to the Adobe MAX 2008 conference in San Francisco, and US$500 in O'Reilly books
Every English-language Adobe Developer Library (ADL) book published by O'Reilly Media
Five O'Reilly Media books of the winner's choice
Community choice award: US$350 in O'Reilly Media books to the winner of the top-rated recipe during the contest period

Agenda FlexCamp London
We’ll talk about best practices using SQLite support in AIR with Flex
I’ll show examples on :
Create and open a database
Synchronous and Asyncronous operations
Insert records
Display records
Display records in a hierarchical mode
Using SQL statements from an XML file
Using the DAO Pattern
We will move very quickly  I have only 20 min

Demos FlexCamp London STOP TALKING DEMO NOW

DAO FlexCamp London
Data Access Object is an object that provides an abstract interface to some type of data storage

DAO FlexCamp London
Data Access Object is an object that provides an abstract interface to some type of data storage mechanism
It provides some specific operations without exposing details of the database
public function SalesManager()
{
sqlConnection = SQLManager.getConnection( "flexcamp" );
}
public function getContact(contactId:int):SalesManagerVO
{
return getItem( "SELECT * FROM STUDENTS WHERE CONTACT_ID=? , studentID) as SalesManagerVO;
}

DAO FlexCamp London
Benefits of using DAO (as given by Sun):
The benefits of using data access objects is the relatively simple and rigorous separation between two important parts of an application which can and should know almost nothing of each other, and which can be expected to evolve frequently and independently.
Changing business logic can rely on the same DAO interface, while changes to persistence logic do not affect DAO clients as long as the interface remains correctly implemented.

What I don’t like FlexCamp London
Inconsistency in the AIR and Flex APIs
SQL does not use IResponder but it uses events and Responder as an argument
FILE only uses events
RPC (in Flex SDK) uses events or the IResponders class (with AsynchToken class)

Best Practices FlexCamp London
Open a SQLConnection at the application startup (avoid delays when running statements)
Use only one SQLStatement (with parameters)
Execute the statements within an explicit transaction
Do not concatenate user input into statement text to secure your app
When embedding a SQLite DB into the AIR package the ApplicationFolder is read-only. So, copy the DB in a different folder (using the copyTo method)

we make it RIA Marco Casario CTO – Comtaste http://casario.blogs.com

Marco Casario CTO – Comtaste http://casario.blogs.com

FlexCamp London

by marcocasario on Aug 28, 2008

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FlexCamp London — Presentation Transcript