IOS開發－本地持久化存儲sqlite應用

1. 需求描述
2. 開發環境介紹
3. FMDB介紹
4. 創建工程
5. 引入FMDB到工程
6. 使用案例代碼
7. 運行展示

在游戲開始一段時間後，我們需要存儲角色的基礎信息，以便我休息之後繼續進行上次的旅途。

OS X EI Captian：10.11.4

Xcode： 7.3

ios：9.3

機型：iphone 6s／iphone 6s plus

iOS中的數據持久化方式，基本上有以下四種：

1. 屬性列表
2. 對象歸檔
3. SQLite3
4. Core Data

本文主要介紹如何使用“SQLite3” 持久化方式。

SQLite：是一個開源的嵌入式關係資料庫，它在2000年由D. Richard Hipp發佈，它的減少應用程式管理數據的開銷，
        SQLite可移植性好，很容易使用，很小，高效而且可靠。
        參考地址：http://www.sqlite.org/

 

FMDB：iOS、macOS開源的第三方庫對SQLite的操作進行了封裝。
      參考地址：https://github.com/ccgus/fmdb.git

Xcode 英文版：

1.“Create a new Xcode project”

2.“Choose a template for your new project”>  iOS > Application > Single View Application

3. “Choose options for your new project”

Bundle Identifier：cn.oshine.ios.Lesson02，

Language : Objective-C ,

Devices: iPhone ,

Use Core Data: No,

include Unit Tests:  No,

include UI Tests: No

 4. "Select Folder To Create"

下載FMDB，FMDB的目錄結構

把fmdb.xcodeproj拖動到工作區中。

Lesson02 TARGETS  ：

Build Pharses:

Target Dependencies > FMDB iOS(fmdb)

Link Binary With Libraries > libsqlite3.0.tbd

Link Binary With Libraries > libFMDB-iOS.a

引入頭文件：

#import <Foundation/Foundation.h>

#import "fmdb/FMDB.h"

#import <sqlite3.h>

創建資料庫：

FMDatabase *db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];

    

if (![db open]) {

         NSLog(@"OPEN FAIL");

        return;

}

關閉資料庫：

[db close];

創建表：

 [db executeUpdate:@"CREATE TABLE IF NOT EXISTS profile(name text,val text)"];

插入記錄：

  [db beginTransaction];

    [db executeUpdate:@"INSERT INTO profile(name,val) VALUES (?,?)",@"HP",@"600"];

    [db executeUpdate:@"INSERT INTO profile(name,val) VALUES (?,?)",@"MP",@"250"];

    [db executeUpdate:@"INSERT INTO profile(name,val) VALUES (?,?)",@"攻擊",@"70"];

    [db executeUpdate:@"INSERT INTO profile(name,val) VALUES (?,?)",@"防禦",@"1"];

    [db executeUpdate:@"INSERT INTO profile(name,val) VALUES (?,?)",@"攻速",@"0.3"];

    [db executeUpdate:@"INSERT INTO profile(name,val) VALUES (?,?)",@"移速",@"320"];

    [db commit];

讀取記錄：

 FMDatabase *db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];

    

    if (![db open]) {

        NSLog(@"OPEN FAIL");

        return;

    }

    NSMutableDictionary *dictionary = [NSMutableDictionary dictionary];

    FMResultSet *rs = [db executeQuery:@"SELECT name,val FROM profile"];

    while ([rs next]) {

        [dictionary setObject:[rs stringForColumn:@"val"] forKey:[rs stringForColumn:@"name"]];

    }

    [rs close];

    [db close];

案例界面：

案例代碼：

運行結果：

ViewController.h

//
//  ViewController.h
//  Lesson02
//
//  Created by ouyangjunqiu on 16/4/7.
//  Copyright © 2016年 oshine. All rights reserved.
//

#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>
#import "fmdb/FMDB.h"
#import <sqlite3.h>

@interface ViewController : UIViewController

@property (weak, nonatomic) IBOutlet UILabel *label;

- (IBAction)createTable:(id)sender;

- (IBAction)initRole:(id)sender;

- (IBAction)readProfile:(id)sender;

@end

ViewController.m

//
//  ViewController.m
//  Lesson02
//
//  Created by ouyangjunqiu on 16/4/7.
//  Copyright © 2016年 oshine. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (IBAction)createTable:(id)sender {
    FMDatabase *db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];
    
    if (![db open]) {
         NSLog(@"OPEN FAIL");
        return;
    }
    
    [db executeUpdate:@"CREATE TABLE IF NOT EXISTS profile(name text,val text)"];
    [db close];
}

- (IBAction)initRole:(id)sender {
    FMDatabase *db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];
    
    if (![db open]) {
        NSLog(@"OPEN FAIL");
        return;
    }
    
    [db beginTransaction];
    [db executeUpdate:@"INSERT INTO profile(name,val) VALUES (?,?)",@"HP",@"600"];
    [db executeUpdate:@"INSERT INTO profile(name,val) VALUES (?,?)",@"MP",@"250"];
    [db executeUpdate:@"INSERT INTO profile(name,val) VALUES (?,?)",@"攻擊",@"70"];
    [db executeUpdate:@"INSERT INTO profile(name,val) VALUES (?,?)",@"防禦",@"1"];
    [db executeUpdate:@"INSERT INTO profile(name,val) VALUES (?,?)",@"攻速",@"0.3"];
    [db executeUpdate:@"INSERT INTO profile(name,val) VALUES (?,?)",@"移速",@"320"];
    [db commit];
    [db close];
    
}

- (IBAction)readProfile:(id)sender{
    FMDatabase *db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];
    
    if (![db open]) {
        NSLog(@"OPEN FAIL");
        return;
    }
    NSMutableDictionary *dictionary = [NSMutableDictionary dictionary];
    FMResultSet *rs = [db executeQuery:@"SELECT name,val FROM profile"];
    while ([rs next]) {
        [dictionary setObject:[rs stringForColumn:@"val"] forKey:[rs stringForColumn:@"name"]];
    }
    [rs close];
    [db close];
    
    [self show:dictionary];
}


-(void)show:(NSMutableDictionary *)dictionary {
    
    self.label.numberOfLines = 0;
    
    NSString * text = [[NSString alloc] init];
    for(NSString *key in dictionary) {
        text = [NSString stringWithFormat:@"%@%@:%@\n",text,key,[dictionary objectForKey:key]];
    }
    self.label.text = text;
}

@end

案例結束

NSMutableDictionary Class Reference （key->value可增長數組）

https://developer.apple.com/library/tvos/documentation/Cocoa/Reference/Foundation/Classes/NSMutableDictionary_Class/