第九节用SQLite管理数据库(3)

    success = NO;
}
return success;
}
// DELETE
- (BOOL)deleteAt:(int)index{
BOOL success = YES;
[db executeUpdate:[self setTable:@"DELETE FROM %@ WHERE id = ?"], [NSNumber numberWithInt:index]];
if ([db hadError]) {
    NSLog(@"Err %d: %@", [db lastErrorCode], [db lastErrorMessage]);
    success = NO;
}
return success;
}

- (void)dealloc {
[super dealloc];
}

@end
为了确认程序正确，我们添加一个UITableView。使用initWithNibName 测试DAO。
//NoteController.h
#import <UIKit/UIKit.h>

@class TbNoteDao;

@interface NoteController : UIViewController <UITableViewDataSource, UITableViewDelegate>{
UITableView *myTableView;
TbNoteDao *tbNoteDao;
NSMutableArray *record;
}

@property (nonatomic, retain) UITableView *myTableView;
@property (nonatomic, retain) TbNoteDao *tbNoteDao;
@property (nonatomic, retain) NSMutableArray *record;

@end

//NoteController.m
#import "NoteController.h"
#import "TbNoteDao.h"
#import "TbNote.h"

@implementation NoteController
@synthesize myTableView, tbNoteDao, record;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {
    tbNoteDao = [[TbNoteDao alloc] init];
    [tbNoteDao insertWithTitle:@"TEST TITLE" Body:@"TEST BODY"];
//    [tbNoteDao updateAt:1 Title:@"UPDATE TEST" Body:@"UPDATE BODY"];
//    [tbNoteDao deleteAt:1];
    record = [[tbNoteDao select] retain];
}
return self;
}

- (void)viewDidLoad {
[super viewDidLoad];
myTableView = [[UITableView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]];
myTableView.delegate = self;
myTableView.dataSource = self;
self.view = myTableView;
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [record count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"Cell";

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
    cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];
}
TbNote *tr = (TbNote *)[record objectAtIndex:indexPath.row];
cell.text = [NSString stringWithFormat:@"%i %@", [tr getIndex], tr.title];
return cell;
}

- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}

- (void)dealloc {
[super dealloc];
}

@end
最后我们开看看连接DB，和添加ViewController 的处理。这一同样不使用Interface Builder。
//SqlSampleAppDelegate.h
#import <UIKit/UIKit.h>

@class FMDatabase;

@interface SqlSampleAppDelegate : NSObject <UIApplicationDelegate> {
UIWindow *window;
FMDatabase *db;
}

@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) FMDatabase *db;

- (BOOL)initDatabase;
- (void)closeDatabase;

@end

//SqlSampleAppDelegate.m
#import "SqlSampleAppDelegate.h"
#import "FMDatabase.h"
#import "FMDatabaseAdditions.h"
#import "NoteController.h"

@implementation SqlSampleAppDelegate

@synthesize window;
@synthesize db;

- (void)applicationDidFinishLaunching:(UIApplication *)application {
if (![self initDatabase]){
    NSLog(@"Failed to init Database.");
}
NoteController *ctrl = [[NoteController alloc] initWithNibName:nil bundle:nil];
[window addSubview:ctrl.view];
[window makeKeyAndVisible];
}

课程关键词:

第九节 用SQLite管理数据库(3)

第九节用SQLite管理数据库(3)