IOS-将任意对象存进数据库

model

 //
 //  HMShop.h
 //  将任意对象存进数据库
 //
 //  Created by apple on 14/11/20.
 //  Copyright (c) 2014年 heima. All rights reserved.
 //

 #import <Foundation/Foundation.h>

 @interface HMShop : NSObject <NSCoding>
 @property (nonatomic, copy) NSString *name;
 @property (nonatomic, assign) double  price;

 @end

 //
 //  HMShop.m
 //  将任意对象存进数据库
 //
 //  Created by apple on 14/11/20.
 //  Copyright (c) 2014年 heima. All rights reserved.
 //

 #import "HMShop.h"

 @implementation HMShop
 - (void)encodeWithCoder:(NSCoder *)encoder
 {
     [encoder encodeObject:self.name forKey:@"name"];
     [encoder encodeDouble:self.price forKey:@"price"];
 }

 - (id)initWithCoder:(NSCoder *)decoder
 {
     if (self = [super init]) {
         self.name = [decoder decodeObjectForKey:@"name"];
         self.price = [decoder decodeDoubleForKey:@"price"];
     }
     return self;
 }

 - (NSString *)description
 {
     return [NSString stringWithFormat:@"%@ <-> %f", self.name, self.price];
 }
 @end

Controller

 //
 //  HMViewController.m
 //  将任意对象存进数据库
 //
 //  Created by apple on 14/11/20.
 //  Copyright (c) 2014年 heima. All rights reserved.
 //

 #import "HMViewController.h"
 #import "HMShop.h"
 #import "FMDB.h"

 @interface HMViewController ()
 @property (nonatomic, strong) FMDatabase *db;
 @end

 @implementation HMViewController

 - (void)viewDidLoad
 {
     [super viewDidLoad];

     [self setup];

     [self readShops];
 }

 - (void)setup
 {
     // 初始化
     NSString *path = @"/Users/apple/Desktop/shops.data";
     self.db = [FMDatabase databaseWithPath:path];
     [self.db open];

     // 2.创表
     [self.db executeUpdate:@"CREATE TABLE IF NOT EXISTS t_shop (id integer PRIMARY KEY, shop blob NOT NULL);"];
 }

 - (void)readShops
 {
     FMResultSet *set = [self.db executeQuery:@"SELECT * FROM t_shop LIMIT 10,10;"];
     while (set.next) {
         NSData *data = [set objectForColumnName:@"shop"];
         HMShop *shop = [NSKeyedUnarchiver unarchiveObjectWithData:data];
         NSLog(@"%@", shop);
     }
 //    NSMutableArray *shops = [NSKeyedUnarchiver unarchiveObjectWithFile:@"/Users/apple/Desktop/shops.data"];
 //    NSLog(@"%@", [shops subarrayWithRange:NSMakeRange(20, 10)]);
 }

 - (void)addShops
 {
 //    NSMutableArray *shops = [NSMutableArray array];
 //    for (int i = 0; i<1000; i++) {
 //        HMShop *shop = [[HMShop alloc] init];
 //        shop.name = [NSString stringWithFormat:@"商品--%d", i];
 //        shop.price = arc4random() % 10000;
 //        [shops addObject:shop];
 //    }
 //    [NSKeyedArchiver archiveRootObject:shops toFile:@"/Users/apple/Desktop/shops.data"];
     for (int i = ; i<; i++) {
         HMShop *shop = [[HMShop alloc] init];
         shop.name = [NSString stringWithFormat:@"商品--%d", i];
         shop.price = arc4random() % ;

         NSData *data = [NSKeyedArchiver archivedDataWithRootObject:shop];
         [self.db executeUpdateWithFormat:@"INSERT INTO t_shop(shop) VALUES (%@);", data];
     }
 }

 @end