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Depots are currently built on top of HTML 5 databases, but this is an implementation detail and may change in the future Create Depot objects using the MojoDepot() API

same retain counts as Listing 5-4

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#import <Foundation/Foundationh> @interface Foo : NSObject { } -(void) sayHello: (NSString *) personName; @end

WebOS includes full support for HTML 5 Database objects Like their server brethren, these databases have tables and are queried using the SQL query language Like Depots and Cookie objects, databases are unique per application To create a database, use the openDatabase() method To query a database, use the executeSQL() method WebOS applications using databases need to be careful to avoid SQL injection, a common web application vulnerability Similar to script injection, this vulnerability results from inserting unescaped user data directly into queries Depending on the application, this may allow malware to corrupt the application s database or steal sensitive data The risk on WebOS is smaller than the risk to web applications because databases are per-application and there aren t different authentication stages Even though the risk is less, it is worth preventing SQL injection by using parameterized queries and never building SQL queries using string concatenation Parameterized queries are created by using the placeholder instead of the actual value when authoring the query The parameter s value is then provided in a separate argument array Because the query and the data are provided separately, the database engine does not become confused and accidentally interpret the user data as part of the queries executable portion Here s an example:

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A cookie is simply a piece of text that a Web server can store on a user s hard drive Cookies enable web sites to store information on a user s machine and gain access to that information when needed The data that are stored in a cookie file are known as name-value pairs In many cases, cookies benefit the web site operator and web site surfer A web site may store information about a username and even a password that an individual used to gain access to a site A cookie may also be used to store information about how a web page was set up or accessed The use of cookies breaks down into three main categories: Online ordering systems: Cookies are used to remember what a person wants to buy For example, if a user shops at a web site, filling up a shopping cart or a wish list, but then logs off, later, when the user returns, all the items on that wish list will be remembered and remain in the shopping cart Site personalization: Just as it sounds Cookies are used to remember preferences that a user sets at a web site How a forum is used, how items are displayed, lined up, or any visual preference the site allows Web site usage analysis: Cookies can be used to identify repeat visitors to a web site Some types of analysis software can create profiles based on accumulated browsing patterns This can be a helpful tool for Web site designers or web masters as they can use the information to help improve the site Cookie data are simply name-value pairs stored on a hard disk by a web site The web site stores the data on the local system only to retrieve it at a later date A web site can only receive the data it has stored on a system that has been to the site It cannot look at any other cookie or any other file on a system.

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transactionexecuteSql( SELECT * FROM Vulnerabilities WHERE Id = , [ vuln_id ], onSuccess, onError);

Listing 5-2

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#import "Fooh" @implementation Foo -(void) sayHello: (NSString *) personName { NSMutableString * myHelloString = [[NSMutableString alloc] initWithString:@"Hello "]; [myHelloString appendString:personName]; NSLog(@"Hello %@", myHelloString); NSLog(@"retain count of myHelloString:%i", [myHelloString retainCount]); [myHelloString release]; } @end

In this example, we are selecting entries from the Vulnerabilities table that have the ID matching the vuln_id argument An arbitrary number of parameters and values may be specified for any query To prevent SQL injection, always use parameterized queries

Listing 5-3

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