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Data Persistence Using SQLite
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iOS SDK Programming: A Beginner s Guide
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Key Skills & Concepts
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Creating a database and adding data to it Including the database in Xcode Reading from a database Making a database writable Inserting a record Updating a record Deleting a record
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he SQLite database is a popular open-source database written in C The database is small and designed for embedding in an application, unlike a database such as Oracle that was designed to run on a separate, large server SQLite is part of the standard open-source Linux/ BSD server stack, and as OS X is essentially FreeBSD, it was only natural Apple chose SQLite as the iOS s embedded database
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Adding a SQLite database to your project involves two steps First, you must create the database In this chapter s first task, you create a database using the Firefox SQLite Manager plug-in Second, you must add the SQLite library to your Xcode project The first task also illustrates adding the SQLite library to your Xcode project After creating the database and loading it, you can then use the database programmatically via its C programming interface
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Creating a Simple Database Using FireFox SQLite Manager
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1 If you don t already have Firefox, download and install it 2 Select Add-ons from the Tools menu (Figure 16-1) 3 Select Get Add-ons, type SQLite in the search box, and install SQLite Manager 4 Once installed and you have restarted Firefox, select Tools | SQLite Manager
16:
Data Persistence Using SQLite
Figure 16-1 Adding SQLite Manager to Firefox
5 Select the New icon (the blank paper graphic), and create a new database named
myDatabase Save the database file some place where you can easily find it later Note SQLite Manager automatically adds the sqlite extension
6 Click Create Table and create a new table named photos 7 Add three columns: id, name, and photo Make id an INTEGER and check Primary Key
and Autoinc check boxes
8 Make name a VARCHAR and check only Allow Null 9 Make photo a BLOB and check only Allow Null 10 Your screen should resemble Figure 16-2 11 Click OK and the SQLite Manager generates the database table
(continued)
iOS SDK Programming: A Beginner s Guide
Figure 16-2 Creating a database using SQLite Manager
NOTE
SQLite does not enforce foreign key relationships You must instead write triggers manually to enforce foreign key relationships SQLite does not support right outer joins or full outer joins SQLite views are read-only 12 Click the Browse & Search tab, and then click the Add Record button 13 In the action sheet, leave id blank Type Icon One for the name Notice the small paper
clip beside photo Move your mouse over the paper clip, and the tooltip should say Add File as a Blob (Figure 16-3) Click the paper clip and add any photo from your computer If the photo column doesn t say something like BLOB (Size: 65984), the file was not correctly added as a blob
14 Click OK, and the record will be added Add another record, selecting any other image
from your computer
16:
Data Persistence Using SQLite
Figure 16-3 Adding a record using SQLite Manager
15 From the menu, select Database | Close Database from the main menus to close the
database You can now exit SQLite Manager and quit Firefox
16 Open Xcode and create a new View-based Application Name the application MyDBProject 17 Expand Frameworks in the Navigator and right-click on any one of the frameworks (eg,
UIKit) and select Show in Finder from the pop-up menu This will get you to the folder with all of your frameworks on your computer Move up two folder levels from there to the SDK folder and then open user/lib
18 Drag and drop the libsqlite30dylib framework from that folder to Frameworks in the
Navigator in Xcode In the dialog that pops up, be sure to uncheck Copy items into destination group s folder and click Finish
19 Add the database file that you created earlier to the Resources folder Be sure to check the
Copy Items check box so that the database file gets copied into MyDBProject
20 This task is now complete with the SQLite library added to the project and the database file
copied into the project s resources Do not delete the project or database, as you will use them for the remainder of this chapter
iOS SDK Programming: A Beginner s Guide
NOTE
Adding binary data using SQLite Manager in Firefox seems to be buggy Sometimes it works, sometimes not If after adding a record the photo column is blank, just edit the row and add the photo file s content again Updating the blob seems to be more stable in SQLite Manager
Basic SQLite Database Manipulation
If you have ever used a database from within a programming language, SQLite database manipulation using C should seem intuitive You open the database You create a prepared statement containing a SQL string That statement might have one or more parameters you bind values to After binding, you execute the statement If the statement returns results, you loop through each record and load the record s column values into your program s variables After looping through all records, you finalize the statement, and, if you are finished with the database, you close the database The steps are similar for most languages and databases
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