//NoteManagedObject.h

//NoteCoreDataLearn

//

//Created by ChengDavid on 14-7-6.

//Copyright (c) 2014年ChengZhifeng. All rights reserved.

//

#import

#import

@interfaceNoteManagedObject :NSManagedObject

@property(nonatomic,retain)NSDate* date;

@property(nonatomic,retain)NSString* content;

@end

//

//NoteManagedObject.m

//NoteCoreDataLearn

//

//Created by ChengDavid on 14-7-6.

//Copyright (c) 2014年ChengZhifeng. All rights reserved.

//

#import"NoteManagedObject.h"

@implementationNoteManagedObject

@dynamicdate;

@dynamiccontent;

@end

//

//Note.h

//NoteCoreDataLearn

//

//Created by ChengDavid on 14-7-6.

//Copyright (c) 2014年ChengZhifeng. All rights reserved.

//

#import

@interfaceNote :NSObject

@property(nonatomic,strong)NSDate*date;

@property(nonatomic,strong)NSString*content;

@end

//

//Note.m

//NoteCoreDataLearn

//

//Created by ChengDavid on 14-7-6.

//Copyright (c) 2014年ChengZhifeng. All rights reserved.

//

#import"Note.h"

@implementationNote

@end

//

//CoreDataDAO.h

//PersistenceLayer

//

//

#import

#import

@interfaceCoreDataDAO :NSObject

//被管理的对象上下文

@property(readonly,strong,nonatomic)NSManagedObjectContext*managedObjectContext;

//被管理的对象模型

@property(readonly,strong,nonatomic)NSManagedObjectModel*managedObjectModel;

//持久化存储协调者

@property(readonly,strong,nonatomic)NSPersistentStoreCoordinator*persistentStoreCoordinator;

- (NSURL*)applicationDocumentsDirectory;

@end

//

//CoreDataDAO.m

//PersistenceLayer

//

//

#import"CoreDataDAO.h"

@implementationCoreDataDAO

@synthesizemanagedObjectContext =_managedObjectContext;

@synthesizemanagedObjectModel =_managedObjectModel;

@synthesizepersistentStoreCoordinator =_persistentStoreCoordinator;

#pragma mark - Core Data堆栈

//返回 被管理的对象上下文

- (NSManagedObjectContext*)managedObjectContext

{

if(_managedObjectContext) {

return_managedObjectContext;

}

NSPersistentStoreCoordinator*coordinator = [selfpersistentStoreCoordinator];

if(coordinator) {

_managedObjectContext= [[NSManagedObjectContextalloc]init];

[_managedObjectContextsetPersistentStoreCoordinator:coordinator];

}

return_managedObjectContext;

}

//返回 持久化存储协调者

- (NSPersistentStoreCoordinator*)persistentStoreCoordinator

{

if(_persistentStoreCoordinator) {

return_persistentStoreCoordinator;

}

//数据库文件

NSURL*storeURL = [[selfapplicationDocumentsDirectory]URLByAppendingPathComponent:@"CoreDataNotes.sqlite"];

_persistentStoreCoordinator= [[NSPersistentStoreCoordinatoralloc]initWithManagedObjectModel:[selfmanagedObjectModel]];

[_persistentStoreCoordinatoraddPersistentStoreWithType:NSSQLiteStoreType

configuration:nil

URL:storeURL

options:nil

error:nil];

return_persistentStoreCoordinator;

}

//返回 被管理的对象模型

- (NSManagedObjectModel*)managedObjectModel

{

if(_managedObjectModel) {

return_managedObjectModel;

}

//模型文件

NSURL*modelURL = [[NSBundlemainBundle]URLForResource:@"CoreDataNotes"withExtension:@"momd"];

_managedObjectModel= [[NSManagedObjectModelalloc]initWithContentsOfURL:modelURL];

return_managedObjectModel;

}

#pragma mark -应用程序沙箱

//返回应用程序Docment目录的NSURL类型

- (NSURL*)applicationDocumentsDirectory

{

return[[[NSFileManagerdefaultManager]URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask]lastObject];

}

@end

//

//NoteDAO.h

//MyNotes

//

//

#import

#import"CoreDataDAO.h"

#import"Note.h"

#import"NoteManagedObject.h"

@interfaceNoteDAO :CoreDataDAO

+ (NoteDAO*)sharedManager;

//插入Note方法

-(int) create:(Note*)model;

//删除Note方法

-(int) remove:(Note*)model;

//修改Note方法

-(int) modify:(Note*)model;

//查询所有数据方法

-(NSMutableArray*) findAll;

//按照主键查询数据方法

-(Note*) findById:(Note*)model;

@end

//

//NoteDAO.m

//MyNotes

//

#import"NoteDAO.h"

@implementationNoteDAO

staticNoteDAO*sharedManager =nil;

+ (NoteDAO*)sharedManager

{

staticdispatch_once_tonce;

dispatch_once(&once, ^{

sharedManager= [[selfalloc]init];

[sharedManagermanagedObjectContext];

});

returnsharedManager;

}

//插入Note方法

-(int) create:(Note*)model

{

NSManagedObjectContext*cxt = [selfmanagedObjectContext];

NoteManagedObject*note = [NSEntityDescriptioninsertNewObjectForEntityForName:@"Note"inManagedObjectContext:cxt];

[notesetValue: model.contentforKey:@"content"];

[notesetValue: model.dateforKey:@"date"];

note.date= model.date;

note.content= model.content;

NSError*savingError =nil;

if([self.managedObjectContextsave:&savingError]){

NSLog(@"插入数据成功");

}else{

NSLog(@"插入数据失败");

return-1;

}

return0;

}

//删除Note方法

-(int) remove:(Note*)model

{

NSManagedObjectContext*cxt = [selfmanagedObjectContext];

NSEntityDescription*entityDescription = [NSEntityDescription

entityForName:@"Note"inManagedObjectContext:cxt];

NSFetchRequest*request = [[NSFetchRequestalloc]init];

[requestsetEntity:entityDescription];

NSPredicate*predicate = [NSPredicatepredicateWithFormat:

@"date =%@", model.date];

[requestsetPredicate:predicate];

NSError*error =nil;

NSArray*listData = [cxtexecuteFetchRequest:requesterror:&error];

if([listDatacount] >0) {

NoteManagedObject*note = [listDatalastObject];

[self.managedObjectContextdeleteObject:note];

NSError*savingError =nil;

if([self.managedObjectContextsave:&savingError]){

NSLog(@"删除数据成功");

}else{

NSLog(@"删除数据失败");

return-1;

}

}

return0;

}

//修改Note方法

-(int) modify:(Note*)model

{

NSManagedObjectContext*cxt = [selfmanagedObjectContext];

NSEntityDescription*entityDescription = [NSEntityDescription

entityForName:@"Note"inManagedObjectContext:cxt];

NSFetchRequest*request = [[NSFetchRequestalloc]init];

[requestsetEntity:entityDescription];

NSPredicate*predicate = [NSPredicatepredicateWithFormat:

@"date =%@", model.date];

[requestsetPredicate:predicate];

NSError*error =nil;

NSArray*listData = [cxtexecuteFetchRequest:requesterror:&error];

if([listDatacount] >0) {

NoteManagedObject*note = [listDatalastObject];

note.content= model.content;

NSError*savingError =nil;

if([self.managedObjectContextsave:&savingError]){

NSLog(@"修改数据成功");

}else{

NSLog(@"修改数据失败");

return-1;

}

}

return0;

}

//查询所有数据方法

-(NSMutableArray*) findAll

{

NSManagedObjectContext*cxt = [selfmanagedObjectContext];

NSEntityDescription*entityDescription = [NSEntityDescription

entityForName:@"Note"inManagedObjectContext:cxt];

NSFetchRequest*request = [[NSFetchRequestalloc]init];

[requestsetEntity:entityDescription];

NSSortDescriptor*sortDescriptor = [[NSSortDescriptoralloc]initWithKey:@"date"ascending:YES];

[requestsetSortDescriptors:@[sortDescriptor]];

NSError*error =nil;

NSArray*listData = [cxtexecuteFetchRequest:requesterror:&error];

NSMutableArray*resListData = [[NSMutableArrayalloc]init];

for(NoteManagedObject*moinlistData) {

Note*note = [[Notealloc]init];

note.date= mo.date;

note.content= mo.content;

[resListDataaddObject:note];

}

returnresListData;

}

//按照主键查询数据方法

-(Note*) findById:(Note*)model

{

NSManagedObjectContext*cxt = [selfmanagedObjectContext];

NSEntityDescription*entityDescription = [NSEntityDescription

entityForName:@"Note"inManagedObjectContext:cxt];

NSFetchRequest*request = [[NSFetchRequestalloc]init];

[requestsetEntity:entityDescription];

NSPredicate*predicate = [NSPredicatepredicateWithFormat:

@"date =%@",model.date];

[requestsetPredicate:predicate];

NSError*error =nil;

NSArray*listData = [cxtexecuteFetchRequest:requesterror:&error];

if([listDatacount] >0) {

NoteManagedObject*mo = [listDatalastObject];

Note*note = [[Notealloc]init];

note.date= mo.date;

note.content= mo.content;

returnnote;

}

return nil;

}

@end

//

//NoteBL.h

//NoteCoreDataLearn

//

//Created by ChengDavid on 14-7-6.

//Copyright (c) 2014年ChengZhifeng. All rights reserved.

//

#import

#import"Note.h"

#import"NoteDAO.h"

@interfaceNoteBL :NSObject

//插入Note方法

-(NSMutableArray*)createNote:(Note*)model;

//删除note方法

-(NSMutableArray*)remove:(Note*)model;

//查询所有数据方法

-(NSMutableArray*)findAll;

//修改note方法

-(NSMutableArray*)modify:(Note*)model;

@end

//

//NoteBL.m

//NoteCoreDataLearn

//

//Created by ChengDavid on 14-7-6.

//Copyright (c) 2014年ChengZhifeng. All rights reserved.

//

#import"NoteBL.h"

@implementationNoteBL

//插入Note方法

-(NSMutableArray*)createNote:(Note*)model

{

NoteDAO*dao=[NoteDAOsharedManager];

[daocreate:model];

return[daofindAll];

}

//删除note方法

-(NSMutableArray*)remove:(Note*)model

{

NoteDAO*dao=[NoteDAOsharedManager];

[daoremove:model];

return[daofindAll];

}

//修改note方法

-(NSMutableArray*)modify:(Note*)model

{

NoteDAO*dao=[NoteDAOsharedManager];

[daomodify:model];

return[daofindAll];

}

//查询所有数据方法

-(NSMutableArray*)findAll

{

NoteDAO*dao=[NoteDAOsharedManager];

return[daofindAll];

}

@end

需要提一下的是，这里的NoteDAO用到了单例模式。NoteBL则不需要单例模式。

sqlite文件则会自动在document文件夹下生成，无需理会。用sqlitemanger看了下，里面的数据是不加密的

附上测试的代码

//找到数据库文件的路径。可以观察到自动生成的数据库文件

- (IBAction)test:(id)sender {

NSArray*paths =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);

NSString*documentsDirectory = [pathsobjectAtIndex:0];

NSLog(@"路径：%@",documentsDirectory);

}

- (IBAction)create:(id)sender {

NoteBL*noteBl=[[NoteBLalloc]init];

Note*note=[[Notealloc]init];

note.date= [[NSDatealloc]init];

note.content=@"hello world";

NSMutableArray*dataList = [noteBlcreateNote:note];

intlength = dataList.count;

for(inti=0;i

Note*tmp = [dataListobjectAtIndex:i];

NSLog(@"------%d",i);

NSLog(@"date:%@",tmp.date);

NSLog(@"content:%@",tmp.content);

}

}

- (IBAction)remove:(id)sender {

NoteBL*noteBl=[[NoteBLalloc]init];

NSMutableArray*dataList = [noteBlfindAll];

intlength = dataList.count;

NSLog(@"删之前：%d条记录",length);

if(length<=0)return;

Note*tmp = [dataListobjectAtIndex:length-1];

[noteBlremove:tmp];

dataList = [noteBlfindAll];

length = dataList.count;

NSLog(@"删之后：%d条记录",length);

}

- (IBAction)modify:(id)sender {

NoteBL*noteBl=[[NoteBLalloc]init];

NSMutableArray*dataList = [noteBlfindAll];

NSLog(@"修改之前：");

Note*tmp = [dataListobjectAtIndex:0];

NSLog(@"date:%@",tmp.date);

NSLog(@"content:%@",tmp.content);

[tmpsetContent:@"hhahahhahahhaha"];

dataList = [noteBlmodify:tmp];

NSLog(@"修改之后：");

tmp = [dataListobjectAtIndex:0];

NSLog(@"date:%@",tmp.date);

NSLog(@"content:%@",tmp.content);

}