Sql adobe flex

First you tell the database engine to perform an operation. The database engine does its work in the background while the application continues running. Finally, when the operation is completed or when it fails the database engine dispatches an event. Your code, triggered by the event, carries out subsequent operations. This approach has a significant benefit: the runtime performs the database operations in the background while the main application code continues executing.

If the database operation takes a notable amount of time, the application continues to run. Most importantly, the user can continue to interact with it without the screen freezing.

Nevertheless, asynchronous operation code can be more complex to write than other code. This complexity is usually in cases where multiple dependent operations must be divided up among various event listener methods.

Conceptually, it is simpler to code operations as a single sequence of steps—a set of synchronous operations—rather than a set of operations split into several event listener methods. In addition to asynchronous database operations, Adobe AIR also allows you to execute database operations synchronously. Instead they run in the same execution sequence as all other application code. You tell the database engine to perform an operation.

The code then pauses at that point while the database engine does its work. When the operation completes, execution continues with the next line of your code. Whether operations execute asynchronously or synchronously is set at the SQLConnection level. If you call SQLConnection. Once a SQLConnection instance is connected to a database using open or openAsync , it is fixed to synchronous or asynchronous execution mode unless you close and reopen the connection to the database.

Each execution mode has benefits. For more information on these topics, and suggestions for working in each mode, see Using synchronous and asynchronous database operations. Adobe Flash Platform. The following are some possible uses for a local SQL database in your AIR application: For a data-oriented application for example an address book , a database can be used to store the main application data.

About relational databases A relational database is a mechanism for storing and retrieving data on a computer. SQLConnection Provides the means to create and open databases database files , as well as methods for performing database-level operations and for controlling database transactions.

SQLStatement Represents a single SQL statement a single query or command that is executed on a database, including defining the statement text and setting parameter values. Class Description flash. SQLError Provides information about a database operation error, including the operation that was being attempted and the cause of the failure.

Provides information describing a single table in a database. Step 4: Now, we run the Apache Flex and set the location where we want to install. Click on Continue and follow the instructions. Click on Next button after selecting the versions for each application.

We will need to create an Apache Flex 4. Step 7: Here, we have to check all the boxes to accept each of the License Agreements.

Click on the Install button to download all the components into new Apache Flex 4. Step 8: Once we click on the Install button, the installation of Apache Flex is started. Step 9: Apache Flex is successfully installed.

It is very simple, easy, generic Hello World application. Join YouTube Channel. What is Apache Flex? Adobe supports Apache Flex. The following example shows the JSP page used in this application. This JSP page does not call a database directly. It gets its data from a Java class called ProductService, which in turn uses a Java class called Product to represent individual products.

ProductService, flex. Product, java. Alert; import mx. HTTPService; import mx. ResultEvent; import mx. Applications created with the Flex framework can interact with web services that define their interfaces in a Web Services Description Language 1. WSDL is a standard format for describing the messages that a web service understands, the format of its responses to those messages, the protocols that the web service supports, and where to send messages.