By Kevin Languedoc
This e-book leads you thru the fundamental techniques and new iOS 10 SDK and quick three programming language APIs to construct iPhone and iPad database pushed functions utilizing the defacto general for information garage for cellular apps, SQLite. Readers will find out about SQL operations like deciding upon, putting, updating and deleting information utilizing quite a few facts varieties like textual content, numerical kinds, photographs or even audio/video info. After operating via this booklet, you are going to achieve knowledgeable view of constructing iOS apps utilizing SQlite as an information garage utilizing Objective-C and quick. With construct iOS Database Apps with rapid and SQLite additionally, you will achieve professional wisdom on easy methods to create databases at runtime, together with growing or enhancing indexes, triggers, tables, columns, and perspectives. The examples use time-tested code from operating purposes.
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For this example, I will add code to the AppDelegate application's didFinishLaunchWithOptions method to copy the database file to the Documents directory. Code remove for brevity .... urlForDirectory(FileManager. SearchPathDomainMask. domain)") } } This code will run every time the app is started and will check to see if the file is located in the Documents directory. If it’s not, then it is copied. Ideally, the code should check to see if the file in the bundle is newer than the version in the Documents directory and update accordingly.
Likewise, you can remove these auxiliary databases using the DETACH command. 14 CHAPTER 2 ■ CREATING SQLITE DATABASES Figure 2-6 shows a screenshot the Directory menu item. The Directory menu is another useful way of locating SQLite databases and their home directory. You can locate the database file on disk by choosing the "Default User Directory" option. This will open a Finder window if you are on OS X or a File Explorer window if you are using Windows. Figure 2-6. SQLite Manager Directory menu With the basic database in place, I will move to the next step and create a table and columns.
31 CHAPTER 3 ■ CREATING DATABASES DURING RUNTIME After defining the return array variable, I create a DetailViewController variable and assign it the actual DetailViewController object from the DetailViewController by using the isKindOfClass method. Next, I check to see if the database is still open and open it if necessary. Otherwise, I send the preparedStatement and query and sqlStatement and query respectively to the database engine for execution. Notice how the Swift string is converted to the char data type that is required by SQLite using the cStringUsingEncoding (NSUTF8StringEncoding) method of the String class.