ACTIONSCRIPT 3 Developers Guide en

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Chapter 40: Working with local SQL databases in AIR Adobe AIR 1.0 and later Adobe® AIR® includes the capability of creating and working with local SQL databases. The runtime includes a SQL database engine with support for many standard SQL features, using the open source SQLite database system. A local SQL database can be used for storing local, persistent data. For example, it can be used for application data, application user settings, documents, or any other type of data that you want your application to save locally. About local SQL databases Adobe AIR 1.0 and later For a quick explanation and code examples of using SQL databases, see the following quick start articles on the Adobe Developer Connection: Working asynchronously with a local SQL database (Flex) Working synchronously with a local SQL database (Flex) Using an encrypted database (Flex) Working asynchronously with a local SQL database (Flash) Working synchronously with a local SQL database (Flash) Using an encrypted database (Flash) Adobe AIR includes a SQL-based relational database engine that runs within the runtime, with data stored locally in database files on the computer on which the AIR application runs (for example, on the computer’s hard drive). Because the database runs and data files are stored locally, a database can be used by an AIR application regardless of whether a network connection is available. Thus, the runtime’s local SQL database engine provides a convenient mechanism for storing persistent, local application data, particularly if you have experience with SQL and relational databases. Uses for local SQL databases Adobe AIR 1.0 and later The AIR local SQL database functionality can be used for any purpose for which you might want to store application data on a user’s local computer. Adobe AIR includes several mechanisms for storing data locally, each of which has different advantages. 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. For a document-oriented application, where users create documents to save and possibly share, each document could be saved as a database file, in a user-designated location. (Note, however, that unless the database is encrypted any AIR application would be able to open the database file. Encryption is recommended for potentially sensitive documents.) Last updated 6/6/2012 713
ACTIONSCRIPT 3.0 DEVELOPER’S GUIDE Working with local SQL databases in AIR For a network-aware application, a database can be used to store a local cache of application data, or to store data temporarily when a network connection isn’t available. You could create a mechanism for synchronizing the local database with the network data store. For any application, a database can be used to store individual users’ application settings, such as user options or application information like window size and position. More Help topics Christophe Coenraets: Employee Directory on AIR for Android Raymond Camden: jQuery and AIR - Moving from web page to application About AIR databases and database files Adobe AIR 1.0 and later An individual Adobe AIR local SQL database is stored as a single file in the computer’s file system. The runtime includes the SQL database engine that manages creation and structuring of database files and manipulation and retrieval of data from a database file. The runtime does not specify how or where database data is stored on the file system; rather, each database is stored completely within a single file. You specify the location in the file system where the database file is stored. A single AIR application can access one or many separate databases (that is, separate database files). Because the runtime stores each database as a single file on the file system, you can locate your database as needed by the design of your application and file access constraints of the operating system. Each user can have a separate database file for their specific data, or a database file can be accessed by all application users on a single computer for shared data. Because the data is local to a single computer, data is not automatically shared among users on different computers. The local SQL database engine doesn’t provide any capability to execute SQL statements against a remote or server-based database. About relational databases Adobe AIR 1.0 and later A relational database is a mechanism for storing (and retrieving) data on a computer. Data is organized into tables: rows represent records or items, and columns (sometimes called “fields”) divide each record into individual values. For example, an address book application could contain a “friends” table. Each row in the table would represent a single friend stored in the database. The table’s columns would represent data such as first name, last name, birth date, and so forth. For each friend row in the table, the database stores a separate value for each column. Relational databases are designed to store complex data, where one item is associated with or related to items of another type. In a relational database, any data that has a one-to-many relationship—where a single record can be related to multiple records of a different type—should be divided among different tables. For example, suppose you want your address book application to store multiple phone numbers for each friend; this is a one-to-many relationship. The “friends” table would contain all the personal information for each friend. A separate “phone numbers” table would contain all the phone numbers for all the friends. In addition to storing the data about friends and phone numbers, each table would need a piece of data to keep track of the relationship between the two tables—to match individual friend records with their phone numbers. This data is known as a primary key—a unique identifier that distinguishes each row in a table from other rows in that table. The primary key can be a “natural key,” meaning it’s one of the items of data that naturally distinguishes each record in a table. In the “friends” table, if you knew that none of your friends share a birth date, you could use the birth date column as the primary key (a natural key) of the “friends” table. If there isn’t a natural key, you would create a separate primary key column such as a “friend id” —an artificial value that the application uses to distinguish between rows. Last updated 6/6/2012 714
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ACTIONSCRIPT ® 3.0 Developer’s G
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Contents Chapter 1: Working with da
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Chapter 2: Working with strings Fla
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Chapter 4: Handling errors Flash Pl
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Chapter 5: Using regular expression
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Chapter 13: Working with bitmaps Fl
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Chapter 15: Working with Pixel Bend
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Chapter 16: Working with movie clip
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Chapter 23: Using the Text Layout F
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Chapter 25: Working with video Flas
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Chapter 31: Mouse input Flash Playe
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Chapter 34: Accelerometer input Fla
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Chapter 38: Working with the file s
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Chapter 42: Basics of networking an
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Chapter 43: Sockets Flash Player 9
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Chapter 44: HTTP communications Fla
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Chapter 53: Display screens in AIR
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Chapter 54: Printing Flash Player 9
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Chapter 55: Geolocation If a device
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