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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
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Figure 16-1 Adding SQLite Manager to Firefox
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5 Select the New icon (the blank paper graphic), and create a new database named
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myDatabase Note SQLite Manager automatically adds the sqlite extension
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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
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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)
iPhone 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 1 Click the Browse & Search tab, and then click the Add Record button 2 In the action sheet, leave id blank Name the name Icon One Notice the small paperclip
beside photo Move your mouse over the paperclip, and the tooltip should say Add File as a Blob (Figure 16-3) Click the paperclip and add a photo from the book s Resources folder If the photo column doesn t say something like BLOB (Size: 65984), the file was not added as a blob
3 Click OK, and the record is added Add another record, selecting any image from this
book s Resources folder
4 From the menu, select Database | Close Database and close the database Exit and quit
Firefox
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Data Persistence Using SQLite
Figure 16-3 Adding a record using SQLite Manager
5 Open Xcode and create a new View-based Application Name the application
MyDBProject
6 Select Frameworks in Groups & Files Right-click Frameworks and select Add | Existing
Frameworks from the pop-up menu
7 Navigate to your iPhone Simulator s sdk folder 8 Navigate to usr/lib and add libsqlite30dylib to the project 9 Add the database file to the Resources in Groups & Files Like a photo, check the Copy
Items check box
10 This task is completed Do not delete the project or database, as you use them for this
chapter s remainder
NOTE
On my computer, adding binary data using SQLite Manager is buggy Sometimes it works, sometimes not If getting the file s content added is problematic, a workaround is to add the record and insert Null for the blob s value After inserting, update the row, and add the file s content Updating the blob seems more stable in SQLite Manager
iPhone SDK Programming: A Beginner s Guide
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 an 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
Opening the Database
You open a database using the sqlite3_open, sqlite_open16, or sqlite3_open_v2 commands This chapter uses the sqlite3_open command exclusively The sqlite3_open command takes a database filename as a UTF-8 string and opens the database Listing 16-1, taken from the SQLite s online documentation, lists the sqlite_open3 method signature Listing 16-1 The sqlite3_open method signature (from SQLite online documentation)
int sqlite3_open( const char *filename, /* Database filename (UTF-8) */ sqlite3 **ppDb /* OUT: SQLite db handle */ );
The method returns an integer as the method s success or failure code Listing 16-2, from the SQLite online documentation, lists several common result codes Listing 16-2 SQLite return codes (taken from SQLite online documentation)
0 1 8 9 10 14 20 100 101 /* Successful result */ /* SQL error or missing database */ /* Attempt to write a readonly /* Operation terminated by /* Some kind of disk I/O error /* Unable to open the database file */ /* Data type mismatch */ /* sqlite3_step() has another row /* sqlite3_step() has finished
#define SQLITE_OK #define SQLITE_ERROR #define SQLITE_READONLY database */ #define SQLITE_INTERRUPT #define SQLITE_IOERR occurred */ #define SQLITE_CANTOPEN #define SQLITE_MISMATCH #define SQLITE_ROW ready */ #define SQLITE_DONE executing */
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