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FMDB是将原生的sqlite数据库封装的库，使用起来比较简单，并且FMDB不支持多个线程同时操作,所以一般以串行的方式实现相关的操作。下面以一个简单通讯录的工程来介绍其简单应用：
功能介绍：主界面显示本地数据库中存储的联系人，点击右按钮，实现页面跳转，跳转到添加联系人页面，在添加联系人页面输入联系人姓名和电话，再点击完成将 添加的联系人写入本地数据库，然后跳转到主界面，并刷新主界面，将本地数据库中的所有联系人进行显示。另，在主界面还带有侧滑删除功能。
首先使用CocoaPods引入第三方：FMDB，再引入libsqlite3.0.tbd。其中，libsqlite3.0.tbd的引入方法与Sqlite数据库的引入方法完全相同。如图，
AppDelegate.m中的代码：
1 self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
2 self.window.backgroundColor = [UIColor whiteColor];
3 [self.window makeKeyAndVisible];
4
5 UINavigationController *Nav = [[UINavigationController alloc] initWithRootViewController:[[ListTableViewController alloc] initWithStyle:UITableViewStylePlain]];
6 self.window.rootViewController = Nav;
DataHandle.h(封装的操作数据库的类)
1 #import <Foundation/Foundation.h>
2
3 @interface DataHandle : NSObject
4
5 //单例
6 + (instancetype)sharedDataHandle;
7
8 //创建表
9 - (void)createTable;
10
11 //添加联系人
12 - (void)addContactsWithName:(NSString *)name telephone:(NSString *)telephone;
13
14 //删除联系人
15 - (void)deleteContects:(NSString *)sender;
16
17 //查询显示所有联系人
18 - (NSMutableArray *)searchAllContacts;
19
20 @end
DataHandle.m中的代码：
1 #import "DataHandle.h"
2 #import <FMDB.h>
3 #import <sqlite3.h>
4 #import "ContactModel.h"
5
6 @interface DataHandle ()
7 //数据库对象
8 @property (nonatomic, strong) FMDatabase *dataBase;
9 //表路径
10 @property (nonatomic, strong) NSString *filePath;
11
12 @end
13
14 @implementation DataHandle
15
16 //单例
17 + (instancetype)sharedDataHandle {
18 static DataHandle *dataHandle = nil;
19 static dispatch_once_t onceToken = 0;
20 dispatch_once(&onceToken, ^{
21 dataHandle = [[DataHandle alloc] init];
22 });
23 return dataHandle;
24 }
25 //懒加载
26 - (FMDatabase *)dataBase {
27 if (_dataBase == nil) {
28 NSString *documentsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
29 self.filePath = [documentsPath stringByAppendingPathComponent:@"contacts.sqlite"];
30 self.dataBase = [FMDatabase databaseWithPath:self.filePath];
31 NSLog(@"%@", self.filePath);
32
33 }
34 return _dataBase;
35 }
36
37 //创建表
38 - (void)createTable {
39 if ([self.dataBase open]) {
40 BOOL result = [self.dataBase executeUpdate:@"create table if not exists contacts(ID integer primary key autoincrement not null, name text not null, telephone text not null)"];
41
42 if (result) {
43 NSLog(@"创建表成功");
44
45 }else{
46 NSLog(@"创建表失败");
47 }
48 }
49 [self.dataBase close];
50
51 }
52 //添加联系人
53 - (void)addContactsWithName:(NSString *)name telephone:(NSString *)telephone {
54 [self.dataBase open];
55 //使用队列添加联系人
56 FMDatabaseQueue *queue = [[FMDatabaseQueue alloc] initWithPath:self.filePath];
57 __block BOOL isSucceed = YES;
58 [queue inTransaction:^(FMDatabase *db, BOOL *rollback) {
59
60 isSucceed = [db executeUpdate:@"insert into contacts (name,telephone)values(?,?)", name,telephone] && isSucceed;
61 if (!isSucceed) {
62 *rollback = YES;
63 return;
64 }
65 }];
66 [self.dataBase close];
67 }
68
69 //查询显示所有联系人
70 - (NSMutableArray *)searchAllContacts {
71 NSMutableArray *array = [NSMutableArray array];
72 [self.dataBase open];
73 //查询结果使用的类FMResultSet
74 FMResultSet *resultSet = [self.dataBase executeQuery:@"select * from contacts"];
75 //遍历出需要的结果内容
76 while ([resultSet next]) {
77 NSString *name = [resultSet objectForColumnName:@"name"];
78 NSString *telephone = [resultSet objectForColumnName:@"telephone"];
79 ContactModel *model = [[ContactModel alloc] init];
80 model.name = name;
81 model.telephone = telephone;
82 [array addObject:model];
83 }
84 [self.dataBase close];
85 return array;
86 }
87
88 //删除联系人
89 - (void)deleteContects:(NSString *)sender {
90
91 [self.dataBase open];
92 BOOL result = [self.dataBase executeUpdate:@"delete from contacts where name = ?", sender];
93 if (result) {
94 NSLog(@"删除成功");
95 }else {
96 NSLog(@"删除失败");
97 }
98 [self.dataBase close];
99
100 }
ContactModel.h 模型：
1 #import <Foundation/Foundation.h>
2
3 @interface ContactModel : NSObject
4
5 @property (nonatomic, copy) NSString *name;
6 @property (nonatomic, copy) NSString *telephone;
7
8 @end
ListTableViewController.m 主界面
1 #import "ListTableViewController.h"
2 #import "DetailViewController.h"
3 #import "DataHandle.h"
4 #import "ContactModel.h"
5 #import "ListTableViewCell.h"
6
7 @interface ListTableViewController ()
8
9 @property (nonatomic, strong) DataHandle *dataHandle;
10 ///用于接收数据库中取出的数据
11 @property (nonatomic, strong) NSMutableArray *allContactsArray;
12
13 @end
14
15 @implementation ListTableViewController
16 //懒加载
17 - (NSMutableArray *)allContactsArray {
18 if (_allContactsArray == nil) {
19 _allContactsArray = [NSMutableArray array];
20 }
21 return _allContactsArray;
22 }
23
24 - (void)viewDidLoad {
25 [super viewDidLoad];
26 //添加导航栏右按钮
27 self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(rightAction)];
28 [self.tableView registerNib:[UINib nibWithNibName:@"ListTableViewCell" bundle:nil] forCellReuseIdentifier:@"listCell"];
29 [self loadData];
30
31 }
32
33 #pragma mark - 从数据库中取出数据显示在tableView上
34 - (void)loadData {
35 self.dataHandle = [DataHandle sharedDataHandle];
36 self.allContactsArray = [self.dataHandle searchAllContacts];
37 [self.tableView reloadData];
38 }
39 #pragma mark - 右按钮点击事件
40 - (void)rightAction {
41
42 //点击导航栏右按钮跳转到添加联系人界面
43 DetailViewController *detailVC = [[DetailViewController alloc] init];
44 //block的实现（刷新tableView）
45 __weak typeof(self)weakSelf = self;
46 detailVC.Myblock = ^(){
47 [weakSelf loadData];
48 };
49 [self.navigationController pushViewController:detailVC animated:YES];
50 }
51
52
53 #pragma mark - Table view data source
54 //section
55 - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
56
57 return 1;
58 }
59 //row
60 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
61
62 return self.allContactsArray.count;
63 }
64
65 //cell
66 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
67 ListTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"listCell" forIndexPath:indexPath];
68 ContactModel *model = self.allContactsArray[indexPath.row];
69 cell.nameLabel.text = model.name;
70 cell.telephoneLabel.text = model.telephone;
71 return cell;
72 }
73
74 - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
75 return 80;
76 }
77
78 // Override to support editing the table view.//侧滑删除功能将本地数据库中相应的内容删除，再将self.allContactsArray中的内容删除，最后更新UI
79 - (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
80 if (editingStyle == UITableViewCellEditingStyleDelete) {
81 ContactModel *model = self.allContactsArray[indexPath.row];
82 self.dataHandle = [DataHandle sharedDataHandle];
83 [self.dataHandle deleteContects:model.name];
84 [self.allContactsArray removeObjectAtIndex:indexPath.row];
85
86 [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
87 } else if (editingStyle == UITableViewCellEditingStyleInsert) {
88
89 }
90 }
91
92 @end
DetailViewController.h 添加联系人界面：
1 #import <UIKit/UIKit.h>
2
3 typedef void(^block)();//定义block方法，实现回调刷新tableView
4 @interface DetailViewController : UIViewController
5
6 @property (nonatomic, copy) block Myblock;
7
8 @end
DetailViewController.m 添加联系人界面：使用xib搭建的界面
1 #import "DetailViewController.h"
2 #import "DataHandle.h"
3 #import "ListTableViewController.h"
4
5
6 @interface DetailViewController ()
7 ///联系人姓名
8 @property (weak, nonatomic) IBOutlet UITextField *nameField;
9 ///电话号码
10 @property (weak, nonatomic) IBOutlet UITextField *telephoneField;
11 ///封装的数据库
12 @property (nonatomic, strong) DataHandle *dataHandle;
13
14 @end
15
16 @implementation DetailViewController
17
18 - (void)viewDidLoad {
19 [super viewDidLoad];
20 //添加导航栏右按钮
21 self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"完成" style:UIBarButtonItemStylePlain target:self action:@selector(doneAction)];
22 self.dataHandle = [DataHandle sharedDataHandle];
23 [self.dataHandle createTable];
24
25 }
26 #pragma mark - 导航栏右按钮响应方法
27 - (void)doneAction {
28
29 //self.Myblock(self.nameField.text, self.telephoneField.text);
30 [self.dataHandle addContactsWithName:self.nameField.text telephone:self.telephoneField.text];
31 self.Myblock();//触发block，实现ListTableViewController页面的tableView刷新
32 [self.navigationController popViewControllerAnimated:YES];
33
34 }
35
36 @end
ListTableViewCell.h自定义cell使用的xib搭建的界面：
1 #import <UIKit/UIKit.h>
2
3 @interface ListTableViewCell : UITableViewCell
4
5 @property (weak, nonatomic) IBOutlet UILabel *nameLabel;
6
7 @property (weak, nonatomic) IBOutlet UILabel *telephoneLabel;
8
9 @end
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原文地址：http://www.cnblogs.com/bdlfbj/p/5547776.html
