Build iOS Database Apps with Swift and SQLite by Kevin Languedoc

By Kevin Languedoc

This booklet leads you thru the fundamental options and new iOS 10 SDK and rapid three programming language APIs to construct iPhone and iPad database pushed purposes utilizing the defacto common for info garage for cellular apps, SQLite. Readers will find out about SQL operations like picking out, putting, updating and deleting info utilizing numerous facts forms like textual content, numerical forms, photographs or even audio/video information. After operating via this ebook, you'll achieve a professional view of constructing iOS apps utilizing SQlite as a knowledge garage utilizing Objective-C and fast. With construct iOS Database Apps with rapid and SQLite additionally, you will achieve specialist wisdom on the way to create databases at runtime, together with growing or enhancing indexes, triggers, tables, columns, and perspectives. The examples use time-tested code from operating functions.

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Example text

Import Foundation import UIKit public class DbMgrDAO:NSObject{ } Immediately following the class definition, I will add some properties variables. The db variable has a COpaquePointer data type. This data type is a wrapper for the C opaque pointer, which is a pointer for unknown data types. SQLite make use of pointers throughout its API. The dbPath variable is an NSURL data type and will be used to hold the path for the stored database that is open. To pass queries to the SQLite database engine, you will need a prepared statement, which is set up using a COpaquePointer as well and is named sqlStatement.

You also need to indicate if the trigger is launched before, after, or instead of the creation of a record, as well as which database event the trigger is the result of, like UPDATE, INSERT, or DELETE. Figure 2-17. Create Trigger interface 21 CHAPTER 2 ■ CREATING SQLITE DATABASES Next, you need to write the query to be performed on the records. In this example, I want the trigger to calculate the royalties an author will receive on book sales. I have a provided the code snippet for the example trigger CalcRoyalties (Figure 2-18).

Text) } The detailSQLiteQueryField @IBOutlet The detailSQLiteQueryField is an IBOutlet variable associated with the UITextArea component of the same name in the Detail scene. It is the main work area of the UI, loading and editing queries as well as providing the SQLite database file to create and/or open. The variable’s signature is completely defined through the Interface Builder (IB). Keep in mind that you can create the same functionality programmatically. @IBOutlet weak var detailSQLiteQueryField: UITextView!

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