1 //
 2 //  YYViewController.m
 3 //  02-归档
 4 //
 5 //  Created by apple on 14-6-7.
 6 //  Copyright (c) 2015年 itcase. All rights reserved.
 7 //
 8 
 9 #import "YYViewController.h"
10 #import "YYPerson.h"
11 
12 @interface YYViewController ()
13 - (IBAction)saveBtnOnclick:(id)sender;
14 - (IBAction)readBtnOnclick:(id)sender;
15 
16 @end
17 
18 @implementation YYViewController
19 
20 - (void)viewDidLoad
21 {
22     [super viewDidLoad];
23 }
24 
25 
26 - (IBAction)saveBtnOnclick:(id)sender {
27     //1.创建对象
28     YYPerson *p=[[YYPerson alloc]init];
29     p.name=@"iCocos";
30     p.age=23;
31     p.height=1.7;
32     
33     //2.获取文件路径
34     NSString *docPath=[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject];
35     NSString *path=[docPath stringByAppendingPathComponent:@"person.yangyang"];
36     NSLog(@"path=%@",path);
37     
38     //3.将自定义的对象保存到文件中
39     [NSKeyedArchiver archiveRootObject:p toFile:path];
40     
41 }
42 
43 - (IBAction)readBtnOnclick:(id)sender {
44     //1.获取文件路径
45     NSString *docPath=[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject];
46     NSString *path=[docPath stringByAppendingPathComponent:@"person.yangyang"];
47     NSLog(@"path=%@",path);
48     
49     //2.从文件中读取对象
50     YYPerson *p=[NSKeyedUnarchiver unarchiveObjectWithFile:path];
51     NSLog(@"%@,%d,%.1f",p.name,p.age,p.height);
52 }
53 @end

 1 //
 2 //  YYPerson.h
 3 //  02-归档
 4 //
 5 //  Created by apple on 14-6-7.
 6 //  Copyright (c) 2014年 itcase. All rights reserved.
 7 //
 8 
 9 #import <Foundation/Foundation.h>
10 
11 // 如果想将一个自定义对象保存到文件中必须实现NSCoding协议
12 @interface YYPerson : NSObject<NSCoding>
13 
14 //姓名
15 @property(nonatomic,copy)NSString *name;
16 //年龄
17 @property(nonatomic,assign)int age;
18 //身高
19 @property(nonatomic,assign)double height;
20 @end

 1 //
 2 //  YYPerson.m
 3 //  02-归档
 4 //
 5 //  Created by apple on 14-6-7.
 6 //  Copyright (c) 2014年 itcase. All rights reserved.
 7 //
 8 
 9 #import "YYPerson.h"
10 
11 @implementation YYPerson
12 
13 // 当将一个自定义对象保存到文件的时候就会调用该方法
14 // 在该方法中说明如何存储自定义对象的属性
15 // 也就说在该方法中说清楚存储自定义对象的哪些属性
16 -(void)encodeWithCoder:(NSCoder *)aCoder
17 {
18     NSLog(@"调用了encodeWithCoder:方法");
19     [aCoder encodeObject:self.name forKey:@"name"];
20     [aCoder encodeInteger:self.age forKey:@"age"];
21     [aCoder encodeDouble:self.height forKey:@"height"];
22 }
23 
24 // 当从文件中读取一个对象的时候就会调用该方法
25 // 在该方法中说明如何读取保存在文件中的对象
26 // 也就是说在该方法中说清楚怎么读取文件中的对象
27 -(id)initWithCoder:(NSCoder *)aDecoder
28 {
29     NSLog(@"调用了initWithCoder:方法");
30     //注意：在构造方法中需要先初始化父类的方法
31     if (self=[super init]) {
32         self.name=[aDecoder decodeObjectForKey:@"name"];
33         self.age=[aDecoder decodeIntegerForKey:@"age"];
34         self.height=[aDecoder decodeDoubleForKey:@"height"];
35     }
36     return self;
37 }
38 @end

 1 //
 2 //  YYstudent.h
 3 //  02-归档
 4 //
 5 //  Created by apple on 14-6-7.
 6 //  Copyright (c) 2014年 itcase. All rights reserved.
 7 //
 8 
 9 #import "YYPerson.h"
10 
11 @interface YYstudent : YYPerson
12 //增加一个体重属性
13 @property(nonatomic,assign) double weight;
14 @end

 1 //
 2 //  YYstudent.m
 3 //  02-归档
 4 //
 5 //  Created by apple on 14-6-7.
 6 //  Copyright (c) 2014年 itcase. All rights reserved.
 7 //
 8 
 9 #import "YYstudent.h"
10 
11 @implementation YYstudent
12 
13 //在子类中重写这两个方法
14 - (void)encodeWithCoder:(NSCoder *)aCoder
15 {
16     [super encodeWithCoder:aCoder];
17     NSLog(@"调用了YYStudent encodeWithCoder");
18     [aCoder encodeFloat:self.weight forKey:@"weight"];
19 }
20 
21 - (id)initWithCoder:(NSCoder *)aDecoder
22 {
23     if (self = [super initWithCoder:aDecoder]) {
24         NSLog(@"调用了YYstudent initWithCoder");
25         self.weight = [aDecoder decodeFloatForKey:@"weight"];
26     }
27     return self;
28 }
29 @end

 1 //
 2 //  YYViewController.m
 3 //  02-归档
 4 //
 5 //  Created by apple on 14-6-7.
 6 //  Copyright (c) 2014年 itcase. All rights reserved.
 7 //
 8 
 9 #import "YYViewController.h"
10 #import "YYPerson.h"
11 #import "YYstudent.h"
12 
13 @interface YYViewController ()
14 - (IBAction)saveBtnOnclick:(id)sender;
15 - (IBAction)readBtnOnclick:(id)sender;
16 
17 @end
18 
19 @implementation YYViewController
20 
21 - (void)viewDidLoad
22 {
23     [super viewDidLoad];
24 }
25 
26 
27 - (IBAction)saveBtnOnclick:(id)sender {
28     //1.创建对象
29 //    YYPerson *p=[[YYPerson alloc]init];
30 //    p.name=@"文顶顶";
31 //    p.age=23;
32 //    p.height=1.7;
33     
34     YYstudent *s=[[YYstudent alloc]init];
35     s.name=@"wendingding";
36     s.age=23;
37     s.height=1.7;
38     s.weight=62;
39     //2.获取文件路径
40     NSString *docPath=[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject];
41     NSString *path=[docPath stringByAppendingPathComponent:@"person.yangyang"];
42     NSLog(@"path=%@",path);
43     
44     //3.将自定义的对象保存到文件中
45 //    [NSKeyedArchiver archiveRootObject:p toFile:path];
46      [NSKeyedArchiver archiveRootObject:s toFile:path];
47     
48 }
49 
50 - (IBAction)readBtnOnclick:(id)sender {
51     //1.获取文件路径
52     NSString *docPath=[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject];
53     NSString *path=[docPath stringByAppendingPathComponent:@"person.yangyang"];
54     NSLog(@"path=%@",path);
55     
56     //2.从文件中读取对象
57 //    YYPerson *p=[NSKeyedUnarchiver unarchiveObjectWithFile:path];
58 //    NSLog(@"%@,%d,%.1f",p.name,p.age,p.height);
59     YYstudent *s=[NSKeyedUnarchiver unarchiveObjectWithFile:path];
60     NSLog(@"%@,%d,%.1f,%f",s.name,s.age,s.height,s.weight);
61 }
62 @end

    //1.创建对象
    YYstudent *s=[[YYstudent alloc]init];
    s.name=@"wendingding";
    s.age=23;
    s.height=1.7;
    s.weight=62;
    
    //2.获取文件路径
    NSString *docPath=[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject];
    NSString *path=[docPath stringByAppendingPathComponent:@"person.yangyang"];
    NSLog(@"path=%@",path);
    
    //3.将自定义的对象保存到文件中
     [NSKeyedArchiver archiveRootObject:s toFile:path];

 //1.获取文件路径
    NSString *docPath=[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject];
    NSString *path=[docPath stringByAppendingPathComponent:@"person.yangyang"];
    //2.从文件中读取对象
    YYstudent *s=[NSKeyedUnarchiver unarchiveObjectWithFile:path];

 1 //
 2 //  YYViewController.m
 3 //  01-偏好设置
 4 //
 5 //  Created by apple on 14-6-7.
 6 //  Copyright (c) 2014年 itcase. All rights reserved.
 7 //
 8 
 9 #import "YYViewController.h"
10 //偏好设置
11 @interface YYViewController ()
12 /**
13  *保存数据
14  */
15 - (IBAction)saveData:(id)sender;
16 /**
17  *  读取数据
18  */
19 - (IBAction)readData:(id)sender;
20 
21 @end
22 
23 @implementation YYViewController
24 
25 - (IBAction)saveData:(id)sender {
26     //1.获取NSUserDefaults对象
27     NSUserDefaults *defaults=[NSUserDefaults standardUserDefaults];
28     
29     //2保存数据(如果设置数据之后没有同步, 会在将来某一时间点自动将数据保存到Preferences文件夹下面)
30     [defaults setObject:@"yangyong" forKey:@"name"];
31     [defaults setInteger:23 forKey:@"age"];
32     [defaults setDouble:1.73f forKey:@"height"];
33     [defaults setObject:@"man" forKey:@"gender"];
34     
35     //3.强制让数据立刻保存
36     [defaults synchronize];
37 }
38 
39 - (IBAction)readData:(id)sender {
40     //1.获取NSUserDefaults对象
41     NSUserDefaults *defaults=[NSUserDefaults standardUserDefaults];
42     //读取保存的数据
43     NSString *name=[defaults objectForKey:@"name"];
44     NSString *gender=[defaults objectForKey:@"gender"];
45     NSInteger age=[defaults integerForKey:@"age"];
46     double height=[defaults doubleForKey:@"height"];
47     //打印数据
48     NSLog(@"name=%@,gender=%@,age=%d,height=%.1f",name,gender,age,height);
49 }
50 @end

    //1.获取NSUserDefaults对象
    NSUserDefaults *defaults=[NSUserDefaults standardUserDefaults];
    
    //2保存数据
    [defaults setObject:@"yangyong" forKey:@"name"];
    [defaults setInteger:23 forKey:@"age"];
    [defaults setDouble:1.73f forKey:@"height"];
    [defaults setObject:@"man" forKey:@"gender"];
    
    //3.强制让数据立刻保存
    [defaults synchronize];

   //1.获取NSUserDefaults对象
    NSUserDefaults *defaults=[NSUserDefaults standardUserDefaults];
    //2.读取保存的数据
    NSString *name=[defaults objectForKey:@"name"];
    NSString *gender=[defaults objectForKey:@"gender"];
    NSInteger age=[defaults integerForKey:@"age"];
    double height=[defaults doubleForKey:@"height"];

  
　1 static NoteDAO *sharedManager = nil;
  2 
  3 + (NoteDAO*)sharedManager
  4 {
  5     static dispatch_once_t once;
  6     dispatch_once(&once, ^{
  7         
  8         sharedManager = [[self alloc] init];
  9         [sharedManager createEditableCopyOfDatabaseIfNeeded];
 10         
 11         
 12     });
 13     return sharedManager;
 14 }
 15 
 16 ／／打开数据库
 17 - (void)createEditableCopyOfDatabaseIfNeeded {
 18     
 19     NSString *writableDBPath = [self applicationDocumentsDirectoryFile];
 20     
 21     if (sqlite3_open([writableDBPath UTF8String], &db) != SQLITE_OK) {
 22         sqlite3_close(db);
 23         NSAssert(NO,@"数据库打开失败。");
 24     } else {
 25         char *err;
 26         NSString *createSQL = [NSString stringWithFormat:@"CREATE TABLE IF NOT EXISTS Note (cdate TEXT PRIMARY KEY, content TEXT);"];
 27         if (sqlite3_exec(db,[createSQL UTF8String],NULL,NULL,&err) != SQLITE_OK) {
 28             sqlite3_close(db);
 29             NSAssert1(NO, @"建表失败, %s", err);
 30         }
 31         sqlite3_close(db);
 32     }
 33 }
 34 
 35 - (NSString *)applicationDocumentsDirectoryFile {
 36     NSString *documentDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
 37     NSString *path = [documentDirectory stringByAppendingPathComponent:DBFILE_NAME];
 38     
 39     return path;
 40 }
 41 
 42 
 43 //插入Note方法
 44 -(int) create:(Note*)model
 45 {
 46     
 47     NSString *path = [self applicationDocumentsDirectoryFile];
 48     
 49     if (sqlite3_open([path UTF8String], &db) != SQLITE_OK) {
 50         sqlite3_close(db);
 51         NSAssert(NO,@"数据库打开失败。");
 52     } else {
 53         
 54         NSString *sqlStr = @"INSERT OR REPLACE INTO note (cdate, content) VALUES (?,?)";
 55         
 56         sqlite3_stmt *statement;
 57         //预处理过程
 58         if (sqlite3_prepare_v2(db, [sqlStr UTF8String], -1, &statement, NULL) == SQLITE_OK) {
 59             NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
 60             [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
 61             NSString *nsdate = [dateFormatter stringFromDate:model.date];
 62             
 63             //绑定参数开始
 64             sqlite3_bind_text(statement, 1, [nsdate UTF8String], -1, NULL);
 65             sqlite3_bind_text(statement, 2, [model.content UTF8String], -1, NULL);
 66             
 67             //执行插入
 68             if (sqlite3_step(statement) != SQLITE_DONE) {
 69                 NSAssert(NO, @"插入数据失败。");
 70             }
 71         }
 72         
 73         sqlite3_finalize(statement);
 74         sqlite3_close(db);
 75     }
 76     
 77     return 0;
 78 }
 79 
 80 //删除Note方法
 81 -(int) remove:(Note*)model
 82 {
 83     NSString *path = [self applicationDocumentsDirectoryFile];
 84     
 85     if (sqlite3_open([path UTF8String], &db) != SQLITE_OK) {
 86         sqlite3_close(db);
 87         NSAssert(NO,@"数据库打开失败。");
 88     } else {
 89         
 90         NSString *sqlStr = @"DELETE  from note where cdate =?";
 91         
 92         sqlite3_stmt *statement;
 93         //预处理过程
 94         if (sqlite3_prepare_v2(db, [sqlStr UTF8String], -1, &statement, NULL) == SQLITE_OK) {
 95             NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
 96             [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
 97             NSString *nsdate = [dateFormatter stringFromDate:model.date];
 98             
 99             //绑定参数开始
100             sqlite3_bind_text(statement, 1, [nsdate UTF8String], -1, NULL);
101             //执行
102             if (sqlite3_step(statement) != SQLITE_DONE) {
103                 NSAssert(NO, @"删除数据失败。");
104             }
105         }
106         
107         sqlite3_finalize(statement);
108         sqlite3_close(db);
109     }
110     
111     return 0;
112 }
113 
114 //修改Note方法
115 -(int) modify:(Note*)model
116 {
117     
118     NSString *path = [self applicationDocumentsDirectoryFile];
119     
120     if (sqlite3_open([path UTF8String], &db) != SQLITE_OK) {
121         sqlite3_close(db);
122         NSAssert(NO,@"数据库打开失败。");
123     } else {
124         
125         NSString *sqlStr = @"UPDATE note set content=? where cdate =?";
126         
127         sqlite3_stmt *statement;
128         //预处理过程
129         if (sqlite3_prepare_v2(db, [sqlStr UTF8String], -1, &statement, NULL) == SQLITE_OK) {
130             
131             NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
132             [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
133             NSString *nsdate = [dateFormatter stringFromDate:model.date];
134             
135             //绑定参数开始
136             sqlite3_bind_text(statement, 1, [model.content UTF8String], -1, NULL);
137             sqlite3_bind_text(statement, 2, [nsdate UTF8String], -1, NULL);
138             //执行
139             if (sqlite3_step(statement) != SQLITE_DONE) {
140                 NSAssert(NO, @"修改数据失败。");
141             }
142         }
143         
144         sqlite3_finalize(statement);
145         sqlite3_close(db);
146     }
147     return 0;
148 }
149 
150 //查询所有数据方法
151 -(NSMutableArray*) findAll
152 {
153     
154     NSString *path = [self applicationDocumentsDirectoryFile];
155     NSMutableArray *listData = [[NSMutableArray alloc] init];
156     
157     if (sqlite3_open([path UTF8String], &db) != SQLITE_OK) {
158         sqlite3_close(db);
159         NSAssert(NO,@"数据库打开失败。");
160     } else {
161         
162         NSString *qsql = @"SELECT cdate,content FROM Note";
163         
164         sqlite3_stmt *statement;
165         //预处理过程
166         if (sqlite3_prepare_v2(db, [qsql UTF8String], -1, &statement, NULL) == SQLITE_OK) {
167             
168             NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
169             [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
170             
171             //执行
172             while (sqlite3_step(statement) == SQLITE_ROW) {
173                 char *cdate = (char *) sqlite3_column_text(statement, 0);
174                 NSString *nscdate = [[NSString alloc] initWithUTF8String: cdate];
175                 
176                 char *content = (char *) sqlite3_column_text(statement, 1);
177                 NSString * nscontent = [[NSString alloc] initWithUTF8String: content];
178                 
179                 Note* note = [[Note alloc] init];
180                 note.date = [dateFormatter dateFromString:nscdate];
181                 note.content = nscontent;
182                 
183                 [listData addObject:note];
184                 
185             }
186         }
187         
188         sqlite3_finalize(statement);
189         sqlite3_close(db);
190         
191     }
192     return listData;
193 }
194 
195 //按照主键查询数据方法
196 -(Note*) findById:(Note*)model
197 {
198     
199     NSString *path = [self applicationDocumentsDirectoryFile];
200     
201     if (sqlite3_open([path UTF8String], &db) != SQLITE_OK) {
202         sqlite3_close(db);
203         NSAssert(NO,@"数据库打开失败。");
204     } else {
205         
206         NSString *qsql = @"SELECT cdate,content FROM Note where cdate =?";
207         
208         sqlite3_stmt *statement;
209         //预处理过程
210         if (sqlite3_prepare_v2(db, [qsql UTF8String], -1, &statement, NULL) == SQLITE_OK) {
211             //准备参数
212             NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
213             [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
214             NSString *nsdate = [dateFormatter stringFromDate:model.date];
215             //绑定参数开始
216             sqlite3_bind_text(statement, 1, [nsdate UTF8String], -1, NULL);
217             
218             //执行
219             if (sqlite3_step(statement) == SQLITE_ROW) {
220                 char *cdate = (char *) sqlite3_column_text(statement, 0);
221                 NSString *nscdate = [[NSString alloc] initWithUTF8String: cdate];
222                 
223                 char *content = (char *) sqlite3_column_text(statement, 1);
224                 NSString * nscontent = [[NSString alloc] initWithUTF8String: content];
225                 
226                 Note* note = [[Note alloc] init];
227                 note.date = [dateFormatter dateFromString:nscdate];
228                 note.content = nscontent;
229                 
230                 sqlite3_finalize(statement);
231                 sqlite3_close(db);
232                 
233                 return note;
234             }
235         }
236         
237         sqlite3_finalize(statement);
238         sqlite3_close(db);
239         
240     }
241     return nil;
242 }

 1 #pragma mark - Core Data 堆栈
 2 //返回 被管理的对象上下文
 3 - (NSManagedObjectContext *)managedObjectContext
 4 {
 5     if (_managedObjectContext) {
 6         return _managedObjectContext;
 7     }
 8     
 9     NSPersistentStoreCoordinator *coordinator = [self persistentStoreCoordinator];
10     if (coordinator) {
11         _managedObjectContext = [[NSManagedObjectContext alloc] init];
12         [_managedObjectContext setPersistentStoreCoordinator:coordinator];
13     }
14     return _managedObjectContext;
15 }
16 
17 // 返回 持久化存储协调者
18 - (NSPersistentStoreCoordinator *)persistentStoreCoordinator
19 {
20     if (_persistentStoreCoordinator) {
21         return _persistentStoreCoordinator;
22     }
23     
24     NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"CoreDataNotes.sqlite"];
25     
26     _persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];
27     
28     [_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType
29                       configuration:nil
30                                 URL:storeURL
31                             options:nil
32                               error:nil];
33     
34     return _persistentStoreCoordinator;
35 }
36 
37 //  返回 被管理的对象模型
38 - (NSManagedObjectModel *)managedObjectModel
39 {
40     if (_managedObjectModel) {
41         return _managedObjectModel;
42     }
43     NSURL *modelURL = [[NSBundle mainBundle] URLForResource:@"CoreDataNotes" withExtension:@"momd"];
44     _managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL];
45     return _managedObjectModel;
46 }
47 
48 #pragma mark - 应用程序沙箱
49 // 返回应用程序Docment目录的NSURL类型
50 - (NSURL *)applicationDocumentsDirectory
51 {
52     return [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];
53 }

  1 static NoteDAO *sharedManager = nil;
  2 
  3 + (NoteDAO*)sharedManager
  4 {
  5     static dispatch_once_t once;
  6     dispatch_once(&once, ^{
  7         
  8         sharedManager = [[self alloc] init];
  9         [sharedManager managedObjectContext];
 10         
 11     });
 12     return sharedManager;
 13 }
 14 
 15 
 16 //插入Note方法
 17 -(int) create:(Note*)model
 18 {
 19     
 20     NSManagedObjectContext *cxt = [self managedObjectContext];
 21     
 22     NoteManagedObject *note = [NSEntityDescription insertNewObjectForEntityForName:@"Note" inManagedObjectContext:cxt];
 23     [note setValue: model.content forKey:@"content"];
 24     [note setValue: model.date forKey:@"date"];
 25     
 26     note.date = model.date;
 27     note.content = model.content;
 28     
 29     NSError *savingError = nil;
 30     if ([self.managedObjectContext save:&savingError]){
 31         NSLog(@"插入数据成功");
 32     } else {
 33         NSLog(@"插入数据失败");
 34         return -1;
 35     }
 36     
 37     return 0;
 38 }
 39 
 40 //删除Note方法
 41 -(int) remove:(Note*)model
 42 {
 43     
 44     NSManagedObjectContext *cxt = [self managedObjectContext];
 45     
 46     NSEntityDescription *entityDescription = [NSEntityDescription
 47                                               entityForName:@"Note" inManagedObjectContext:cxt];
 48     
 49     NSFetchRequest *request = [[NSFetchRequest alloc] init];
 50     [request setEntity:entityDescription];
 51     
 52     NSPredicate *predicate = [NSPredicate predicateWithFormat:
 53                               @"date =  %@", model.date];
 54     [request setPredicate:predicate];
 55     
 56     NSError *error = nil;
 57     NSArray *listData = [cxt executeFetchRequest:request error:&error];
 58     if ([listData count] > 0) {
 59         NoteManagedObject *note = [listData lastObject];
 60         [self.managedObjectContext deleteObject:note];
 61         
 62         NSError *savingError = nil;
 63         if ([self.managedObjectContext save:&savingError]){
 64             NSLog(@"删除数据成功");
 65         } else {
 66             NSLog(@"删除数据失败");
 67             return -1;
 68         }
 69     }
 70     
 71     return 0;
 72 }
 73 
 74 //修改Note方法
 75 -(int) modify:(Note*)model
 76 {
 77     NSManagedObjectContext *cxt = [self managedObjectContext];
 78     
 79     NSEntityDescription *entityDescription = [NSEntityDescription
 80                                               entityForName:@"Note" inManagedObjectContext:cxt];
 81     
 82     NSFetchRequest *request = [[NSFetchRequest alloc] init];
 83     [request setEntity:entityDescription];
 84     
 85     NSPredicate *predicate = [NSPredicate predicateWithFormat:
 86                               @"date =  %@", model.date];
 87     [request setPredicate:predicate];
 88     
 89     NSError *error = nil;
 90     NSArray *listData = [cxt executeFetchRequest:request error:&error];
 91     if ([listData count] > 0) {
 92         NoteManagedObject *note = [listData lastObject];
 93         note.content = model.content;
 94         
 95         NSError *savingError = nil;
 96         if ([self.managedObjectContext save:&savingError]){
 97             NSLog(@"修改数据成功");
 98         } else {
 99             NSLog(@"修改数据失败");
100             return -1;
101         }
102     }
103     return 0;
104 }
105 
106 //查询所有数据方法
107 -(NSMutableArray*) findAll
108 {
109     NSManagedObjectContext *cxt = [self managedObjectContext];
110     
111     NSEntityDescription *entityDescription = [NSEntityDescription
112                                               entityForName:@"Note" inManagedObjectContext:cxt];
113     
114     NSFetchRequest *request = [[NSFetchRequest alloc] init];
115     [request setEntity:entityDescription];
116     
117     NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"date" ascending:YES];
118     [request setSortDescriptors:@[sortDescriptor]];
119     
120     NSError *error = nil;
121     NSArray *listData = [cxt executeFetchRequest:request error:&error];
122     
123     NSMutableArray *resListData = [[NSMutableArray alloc] init];
124     
125     for (NoteManagedObject *mo in listData) {
126         Note *note = [[Note alloc] init];
127         note.date = mo.date;
128         note.content = mo.content;
129         [resListData addObject:note];
130     }
131     
132     return resListData;
133 }
134 
135 //按照主键查询数据方法
136 -(Note*) findById:(Note*)model
137 {
138     NSManagedObjectContext *cxt = [self managedObjectContext];
139     
140     NSEntityDescription *entityDescription = [NSEntityDescription
141                                               entityForName:@"Note" inManagedObjectContext:cxt];
142     
143     NSFetchRequest *request = [[NSFetchRequest alloc] init];
144     [request setEntity:entityDescription];
145     
146     NSPredicate *predicate = [NSPredicate predicateWithFormat:
147                               @"date =  %@",model.date];
148     [request setPredicate:predicate];
149     
150     NSError *error = nil;
151     NSArray *listData = [cxt executeFetchRequest:request error:&error];
152     
153     if ([listData count] > 0) {
154         NoteManagedObject *mo = [listData lastObject];
155         
156         Note *note = [[Note alloc] init];
157         note.date = mo.date;
158         note.content = mo.content;
159         
160         return note;
161     }
162     return nil;
163 }