IOS使用FMDB封装的数据库增删改查操作

//

//  DBHelper.h

//  LessonStoryBoard

//

//  Created by 袁冬冬 on 15/10/29.

//  Copyright (c) 2015年 袁冬冬. All rights reserved.

//

#import <Foundation/Foundation.h>

#import "FMDB.h"

@interface DBHelper : NSObject

@property (nonatomic, strong) FMDatabaseQueue *databaseQueue; //数据库

- (void)openDB:(NSString *)dbName; //打开数据库，并创建数据库对象

- (void)executeupdate:(NSString *)sql; //执行更新SQL语句，用于插入、修改、删除

- (NSArray *)executeQuery:(NSString *)sql; //执行查询语句

@end

//

//  DBHelper.m

//  LessonStoryBoard

//

//  Created by 袁冬冬 on 15/10/29.

//  Copyright (c) 2015年 袁冬冬. All rights reserved.

//

#import "DBHelper.h"

@implementation DBHelper

- (void)openDB:(NSString *)dbName {

//获取数据库路径，通常保存到沙盒中

NSString *filePath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject] stringByAppendingPathComponent:dbName];

NSLog(@"%@",filePath);

//创建FMDatabaseQueue对象

self.databaseQueue = [FMDatabaseQueue databaseQueueWithPath:filePath];

}

- (void)executeupdate:(NSString *)sql {

//执行更新SQL语句

[self.databaseQueue inDatabase:^(FMDatabase *db) {

[db executeUpdate:sql];

}];

}

- (NSArray *)executeQuery:(NSString *)sql {

NSMutableArray *array = [NSMutableArray array];

[self.databaseQueue inDatabase:^(FMDatabase *db) {

//执行查询语句

FMResultSet *result = [db executeQuery:sql];

while (result.next) {

NSMutableDictionary *dic = [NSMutableDictionary dictionary];

for (int i = 0; i < result.columnCount; i++) {

dic[[result columnNameForIndex:i]] = [result stringForColumnIndex:i];

}

[array addObject:dic];

}

}];

return array;

}

@end

//注册

//

//  RegisterViewController.m

//  LessonStoryBoard

//

//  Created by 袁冬冬 on 15/10/29.

//  Copyright (c) 2015年 袁冬冬. All rights reserved.

//

#import "RegisterViewController.h"

#import "DBHelper.h" //数据库操作类

@interface RegisterViewController ()

@property (weak, nonatomic) IBOutlet UITextField *usernameTF; //用户名

@property (weak, nonatomic) IBOutlet UITextField *passwordTF; //密码

@property (weak, nonatomic) IBOutlet UITextField *rePasswordTF; //确认密码

@property (weak, nonatomic) IBOutlet UITextField *emailTF; //邮箱

@property (weak, nonatomic) IBOutlet UITextField *phoneTF; //手机号

@end

@implementation RegisterViewController

- (void)viewDidLoad {

[super viewDidLoad];

}

- (void)didReceiveMemoryWarning {

[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

/*

#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

// Get the new view controller using [segue destinationViewController].

// Pass the selected object to the new view controller.

}

*/

- (IBAction)reBackClick:(UIButton *)sender {

[self saveDataToDataBase]; //将数据存储到数据库

[self.navigationController popViewControllerAnimated:YES];

}

#pragma mark - save data in database

- (void)saveDataToDataBase {

DBHelper *dbHelper = [[DBHelper alloc] init];

[dbHelper openDB:@"contact.sqlite"]; //打开数据库，创建数据库对象

//创建表

[dbHelper executeupdate:@"create table if not exists t_user(username text primary key,password text,email text,phone text)"];

//插入信息

[dbHelper executeupdate:[NSString stringWithFormat: @"insert into t_user(username,password,email,phone) values(%@,%@,%@,%@)",self.usernameTF.text,self.passwordTF.text,self.emailTF.text,self.phoneTF.text]];

}

@end

//登陆

//

//  LoginViewController.m

//  LessonStoryBoard

//

//  Created by 袁冬冬 on 15/10/29.

//  Copyright (c) 2015年 袁冬冬. All rights reserved.

//

#import "LoginViewController.h"

#import "ListTableViewController.h"

#import "DBHelper.h"

@interface LoginViewController ()

@property (weak, nonatomic) IBOutlet UITextField *userNameTF; //用户名文本框

@property (weak, nonatomic) IBOutlet UITextField *passwordTF; //密码文本框

//默认的账号密码

@property (nonatomic, copy) NSString *name;

@property (nonatomic, copy) NSString *password;

@end

@implementation LoginViewController

- (void)viewDidLoad {

[super viewDidLoad];

self.name = @"admin";

self.password = @"123456";

}

- (void)didReceiveMemoryWarning {

[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

#pragma  mark - Action

//登录按钮响应事件

- (IBAction)LoginClick:(UIButton *)sender {

//获取数据库中的用户名和密码

NSDictionary *dic = [self gainDataFromDataBase];

NSString *myname = dic[@"username"];

NSString *mypw = dic[@"password"];

//创建UIAlertController

if ([self.userNameTF.text isEqualToString:myname] && [self.passwordTF.text isEqualToString:mypw]) {

//获取下一个视图控制器

ListTableViewController *listVC = [self.storyboard instantiateViewControllerWithIdentifier:@"list"];

[self alertController:@"欢迎回来" viewController:listVC];

} else {

[self alertController:@"账号或密码错误" viewController:nil];

}

}

/*

#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

// Get the new view controller using [segue destinationViewController].

// Pass the selected object to the new view controller.

}

*/

//alertController提示框

- (void)alertController:(NSString *)message viewController:(UITableViewController *)controller {

UIAlertController *alertVC = [UIAlertController alertControllerWithTitle:@"温馨提示" message:message preferredStyle:(UIAlertControllerStyleAlert)];

UIAlertAction *action = [UIAlertAction actionWithTitle:@"好" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {

[self.navigationController pushViewController:controller animated:YES];

}];

[alertVC addAction:action];

[self presentViewController:alertVC animated:YES completion:nil];

}

#pragma mark - data from dataBase

- (NSDictionary *)gainDataFromDataBase {

DBHelper *dbHelper = [[DBHelper alloc] init];

[dbHelper openDB:@"contact.sqlite"]; //打开数据库，创建数据库对象

NSArray *array = [dbHelper executeQuery:[NSString stringWithFormat:@"select * from t_user where username = %@ and password = %@",self.userNameTF.text,self.passwordTF.text]];

return array[0];

}

@end