Sample Application for SQLite - iphone

Question

Hello friends
I am developing application in which view has one textField & 2 buttons. When user clicks on "Add" then text from textfield should be stored in datatabse. When user clicks on "Display"then data fetched from database should be displayed in textField. The code written is like this
//SettingsApplicationViewController.h
#import "FMDatabase.h"
#interface SettingsApplicationViewController : UIViewController {
FMDatabase *db;
IBOutlet UITextField *urlField;
IBOutlet UIButton *insertButton;
IBOutlet UIButton *displayButton;
}
#property(nonatomic, retain) IBOutlet UITextField *urlField;
#property(nonatomic, retain) IBOutlet UIButton *insertButton;
#property(nonatomic, retain) IBOutlet UIButton *displayButton;
-(void)insertButtonClicked :(id)sender;
-(void)displayButtonClicked:(id)sender;
-(id)initApp;
#end
// SettingsApplicationViewController.m
#import "SettingsApplicationViewController.h"
#import "FMDatabase.h"
#implementation SettingsApplicationViewController
#synthesize urlField;
#synthesize insertButton;
#synthesize displayButton;
-(id)initApp
{
if(![super init])
return nil;
//DB stored in application bundle
NSString *DBName = #"SettingDB.sqlite";
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path = [documentsDirectory stringByAppendingString:DBName];
db = [FMDatabase databaseWithPath:path];
[db setLogsErrors:TRUE];
[db setTraceExecution:TRUE];
if(![db open])
{
NSLog(#"Could not open Database");
return 0;
}
else
{
NSLog(#"Database opened successfully");
}
return self;
}
- (void)viewDidLoad {
[super viewDidLoad];
[self initApp];
}
-(void)insertButtonClicked :(id)sender
{
[db executeUpdate:#"insert into Settings values (?)",urlField.text];
[self resignFirstResponder];
}
-(void)displayButtonClicked:(id)sender
{
NSString *returnResult = [[NSString alloc]init];
FMResultSet *rs = [db executeQuery:#"select url from Settings"];
while ([rs next])
{
returnResult = [rs stringForColumn:#"url"];
[urlField setText:returnResult];
}
}
// SettingDB.sqlite
CREATE TABLE Settings(url text(50));
I created connections in IB & copied libsqlite3.dylib & FMDatabase file. I dont know why " # " is not printed in this post but I have # in my code.
When I compile this code it is showing 1 error as follows
Command /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.2 failed with exit code 1
Please help me friends.
Thanks

Answer 1

This error is usually displayed when you are referring to a file in Xcode and that file not in the mentioned path. (That file will be shown red in the Project Navigator)

Answer 2

Have you assigned Action for those buttons?
If not do as follows,
Instead of -(void)insertButtonClicked :(id)sender; use -(IBAction)insertButtonClicked :(id)sender; and assign them to respective button action.
or else,
In viewdidLoad,
[insertButton addTarget:self action:#selector(insertButtonClicked:) forControlEvents:UIControlEventTouchUpInside];
[displayButton addTarget:self action:#selector(displaytButtonClicked:) forControlEvents:UIControlEventTouchUpInside];