CoreData使用-创新互联

// NoteCoreDataLearn

目前创新互联已为超过千家的企业提供了网站建设、域名、网页空间、网站运营、企业网站设计、天全网站维护等服务，公司将坚持客户导向、应用为本的策略，正道将秉承"和谐、参与、激情"的文化，与客户和合作伙伴齐心协力一起成长，共同发展。

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

NoteManagedObject :

@property nonatomic retain

@end

// NoteManagedObject.m

// NoteCoreDataLearn

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

"NoteManagedObject.h"

NoteManagedObject

@dynamic

content;

@end

// Note.h

// NoteCoreDataLearn

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

@interface

@property nonatomicstrong

@end

// Note.m

// NoteCoreDataLearn

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

#import

@implementation

@end

// CoreDataDAO.h

// PersistenceLayer

CoreDataDAO :

被管理的对象上下文

@property readonly strong nonatomic

被管理的对象模型

@property readonly strong nonatomic

持久化存储协调者

(, , ) *persistentStoreCoordinator;

- ( *)applicationDocumentsDirectory;

@end

// CoreDataDAO.m

// PersistenceLayer

"CoreDataDAO.h"

@implementation

managedObjectContext = ;

managedObjectModel = ;

persistentStoreCoordinator = ;

#pragma mark - Core Data

返回被管理的对象上下文

- ( *)managedObjectContext

{

_managedObjectContext

}

NSPersistentStoreCoordinator

(coordinator) {

NSManagedObjectContext

setPersistentStoreCoordinator

}

_managedObjectContext

}

返回持久化存储协调者

- ( *)persistentStoreCoordinator

{

_persistentStoreCoordinator

}

//数据库文件

applicationDocumentsDirectory

alloc initWithManagedObjectModel

_persistentStoreCoordinator

:storeURL

:];

_persistentStoreCoordinator

}

返回被管理的对象模型

- ( *)managedObjectModel

{

_managedObjectModel

}

//模型文件

mainBundle URLForResource withExtension

alloc initWithContentsOfURL

_managedObjectModel

}

#pragma mark -

// DocmentNSURL

- ( *)applicationDocumentsDirectory

{

defaultManager URLsForDirectoryNSDocumentDirectory inDomainsNSUserDomainMask lastObject

}

@end

// NoteDAO.h

// MyNotes

"CoreDataDAO.h"

#import

"NoteManagedObject.h"

NoteDAO :

+ (*)sharedManager;

//Note

-() create:(*)model;

//Note

-() remove:(*)model;

//Note

-() modify:(*)model;

查询所有数据方法

NSMutableArray

按照主键查询数据方法

-(*) findById:(*)model;

@end

// NoteDAO.m

// MyNotes

"NoteDAO.h"

@implementation

*sharedManager = ;

+ (*)sharedManager

{

dispatch_once_t

(&once, ^{

= [[ ] ];

managedObjectContext

});

sharedManager

}

//Note

-() create:(*)model

{

NSManagedObjectContext

insertNewObjectForEntityForNameinManagedObjectContext

[note : model. :];

note. = model.;

*savingError = ;

([. :&savingError]){

();

} {

();

}

;

}

//Note

-() remove:(*)model

{

NSManagedObjectContext

NSEntityDescription NSEntityDescription

: :cxt];

NSFetchRequest NSFetchRequest

[request :entityDescription];

NSPredicate NSPredicate

, model.];

[request :predicate];

*error = ;

*listData = [cxt :request :&error];

([listData ] > ) {

*note = [listData ];

managedObjectContext

*savingError = ;

([. :&savingError]){

();

} {

();

}

;

}

//Note

-() modify:(*)model

{

NSManagedObjectContext

NSEntityDescription NSEntityDescription

: :cxt];

NSFetchRequest NSFetchRequest

[request :entityDescription];

NSPredicate NSPredicate

, model.];

[request :predicate];

*error = ;

*listData = [cxt :request :&error];

([listData ] > ) {

*note = [listData ];

note. = model.;

*savingError = ;

([. :&savingError]){

();

} {

();

}

;

}

查询所有数据方法

NSMutableArray

{

NSManagedObjectContext

NSEntityDescription NSEntityDescription

: :cxt];

NSFetchRequest NSFetchRequest

[request :entityDescription];

*sortDescriptor = [[ ] : :];

[request :sortDescriptor];

*error = ;

*listData = [cxt :request :&error];

NSMutableArray NSMutableArray

( *mo listData) {

*note = [[ ] ];

note. = mo.;

[resListData :note];

}

resListData;

}

按照主键查询数据方法

-(*) findById:(*)model

{

NSManagedObjectContext

NSEntityDescription NSEntityDescription

: :cxt];

NSFetchRequest NSFetchRequest

[request :entityDescription];

NSPredicate NSPredicate

,model.];

[request :predicate];

*error = ;

*listData = [cxt :request :&error];

([listData ] > ) {

*mo = [listData ];

*note = [[ ] ];

note. = mo.;

note;

}

return nil

}

@end

// NoteBL.h

// NoteCoreDataLearn

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

#import

"NoteDAO.h"

NoteBL :

//Note

-( *)createNote:( *)model;

//note

-( *)remove:( *)model;

查询所有数据方法

NSMutableArray

//note

-( *)modify:( *)model;

@end

// NoteBL.m

// NoteCoreDataLearn

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

"NoteBL.h"

@implementation

//Note

-( *)createNote:( *)model

{

*dao=[ ];

[dao :model];

[dao ];

}

//note

-( *)remove:( *)model

{

*dao=[ ];

[dao :model];

[dao ];

}

//note

-( *)modify:( *)model

{

*dao=[ ];

[dao :model];

[dao ];

}

查询所有数据方法

NSMutableArray

{

*dao=[ ];

[dao ];

}

@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

- ()test:()sender {

NSSearchPathForDirectoriesInDomainsNSDocumentDirectory NSUserDomainMask

*documentsDirectory = [paths :];

(,documentsDirectory);

}

- ()create:()sender {

*noteBl=[[ ] ];

*note=[[ ] ];

note. = [[ ] ];

@"hello world"

*dataList = [noteBl :note];

length = dataList.;

( i=;i

*tmp = [dataList :i];

(,i);

(,tmp.);

}

- ()remove:()sender {

*noteBl=[[ ] ];

*dataList = [noteBl ];

length = dataList.;

(,length);

(length<=return;

*tmp = [dataList :length-];

[noteBl :tmp];

dataList = [noteBl ];

length = dataList.;

(,length);

}

- ()modify:()sender {

*noteBl=[[ ] ];

*dataList = [noteBl ];

@""

*tmp = [dataList :];

(,tmp.);

@"content:%@"

@"hhahahhahahhaha"

dataList = [noteBl :tmp];

@""

tmp = [dataList :];

(,tmp.);

@"content:%@"

}

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文章名称：CoreData使用-创新互联
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CoreData使用-创新互联

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