CoreData数据库搭建

1.首先创建父类吧重用的代码写在里边

#import <Foundation/Foundation.h>
#import <CoreData/CoreData.h>

@interface DBCenter : NSObject

@property (nonatomic, strong) NSManagedObjectContext *managedObjectContext;
@property (nonatomic, strong) NSManagedObjectModel *managedObjectModel;
@property (nonatomic, strong) NSPersistentStoreCoordinator *persistentStoreCoordinator;

- (NSURL *) modelURL;    //need to be overwrite
- (NSURL *) storeURL;    //need to be overwrite
- (NSString *) storeDirectoryPath;
- (NSString *) entityName;
- (void) saveContext;

@end

#import "DBCenter.h"

@interface DBCenter ()


@end

@implementation DBCenter

- (NSManagedObjectModel *)managedObjectModel {
    // The managed object model for the application. It is a fatal error for the application not to be able to find and load its model.
    if (_managedObjectModel != nil) {
        return _managedObjectModel;
    }
    
//    NSBundle *bundle = [NSBundle bundleWithURL:[[NSBundle mainBundle] URLForResource:@"Resources" withExtension:@"bundle"]];
//    NSURL *modelURL = [bundle URLForResource:@"LECPlayerDataModel" withExtension:@"momd"];
    NSURL *modelURL = [self modelURL];
    
    _managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL];
    return _managedObjectModel;
}

- (NSPersistentStoreCoordinator *)persistentStoreCoordinator {
    // The persistent store coordinator for the application. This implementation creates and return a coordinator, having added the store for the application to it.
    if (_persistentStoreCoordinator != nil) {
        return _persistentStoreCoordinator;
    }
    
    // Create the coordinator and store
    
    _persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];
    NSURL *storeURL = [self storeURL];
    
    NSError *error = nil;
    NSString *failureReason = @"There was an error creating or loading the application's saved data.";
    if (![_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:nil error:&error]) {
        // Report any error we got.
        NSMutableDictionary *dict = [NSMutableDictionary dictionary];
        dict[NSLocalizedDescriptionKey] = @"Failed to initialize the application's saved data";
        dict[NSLocalizedFailureReasonErrorKey] = failureReason;
        dict[NSUnderlyingErrorKey] = error;
        error = [NSError errorWithDomain:@"YOUR_ERROR_DOMAIN" code:9999 userInfo:dict];
        // Replace this with code to handle the error appropriately.
        // abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
        NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
        abort();
    }
    
    return _persistentStoreCoordinator;
}


- (NSManagedObjectContext *)managedObjectContext {
    // Returns the managed object context for the application (which is already bound to the persistent store coordinator for the application.)
    if (_managedObjectContext != nil) {
        return _managedObjectContext;
    }
    
    NSPersistentStoreCoordinator *coordinator = [self persistentStoreCoordinator];
    if (!coordinator) {
        return nil;
    }
    _managedObjectContext = [[NSManagedObjectContext alloc] init];
    [_managedObjectContext setPersistentStoreCoordinator:coordinator];
    return _managedObjectContext;
}

#pragma mark -
- (NSURL *) modelURL {
    return nil;
}

- (NSURL *) storeURL {
    return nil;
}

- (NSString *) storeDirectoryPath {
    NSString *documentDirectory = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
    NSString *dbDirectory = [documentDirectory stringByAppendingPathComponent:@"DB"];
    NSFileManager *fileManager = [NSFileManager defaultManager];
    if (![fileManager fileExistsAtPath:dbDirectory]) {
        [fileManager createDirectoryAtPath:dbDirectory
               withIntermediateDirectories:YES
                                attributes:nil
                                     error:nil];
    }
    return dbDirectory;
}

- (NSString *) entityName {
    return nil;
}

- (void)saveContext {
    NSManagedObjectContext *managedObjectContext = self.managedObjectContext;
    if (managedObjectContext != nil) {
        NSError *error = nil;
        if ([managedObjectContext hasChanges] && ![managedObjectContext save:&error]) {
            // Replace this implementation with code to handle the error appropriately.
            // abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
            NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
            abort();
        }
    }
}

@end

2.然后对于某一个存储模块独立出来继承

@interface DBCenterNewsExtend : DBCenter

+ (DBCenterNewsExtend *) sharedNewsDBCenter;

/*启动广告*/
- (LaunchingAdItemModel *) launchingAdItem;
- (void) fullFillLaunchingAdItemModelWithLaunchingAdItem:(LaunchingAdItem *) launchingAdItem;
- (void) saveLaunchingAdItemDataModel;
- (void) removeLaunchingAdItem;

/*新闻阅读记录*/
- (BOOL) hasReadWithNewsId:(NSString *) newsId;
- (void) addReadRecordWithNewsId:(NSString *) newsId;

/*新闻收藏记录*/
- (BOOL) hasFavoriteWithNewsId:(NSString *) newsId;
- (void) addFavoriteRecordWithNewsDisplayItem:(NewsDisplayItem *) newsDisplayItem;
- (void) removeFavoriteRecordWithNewsId:(NSString *) newsId;
- (NSArray *) favoriteNewsList; //NSArray<NewsParamItem>

/*搜索关键字列表*/
- (void) addSearchKeywordRecord:(NSString *) keyword;
- (NSArray *) keywordsList; //NSArray<NewsSearchKeywordModel>
- (void) cleanKeywordsList;

@end

@interface DBCenterNewsExtend ()

@property (nonatomic, strong) LaunchingAdItemModel *launchingAdItemModel;
@property (nonatomic, strong) NSMutableArray *mNewsReadRecordsList;
@property (nonatomic, strong) NSMutableArray *mNewsDisplayModelList;
@property (nonatomic, strong) NSMutableArray *mNewsDisplayItemList;
@property (nonatomic, strong) NSMutableArray *mSearchKeywordsList;

- (void) loadLaunchingAdItemModel;
- (NSString *) launchingAdEntityName;

- (void) loadReadRecordsList;
- (NSString *) newsReadRecordEntityName;
- (NewsReadRecordItemModel *) newsReadRecordItemModelWithNewsId:(NSString *) newsId;

- (void) loadFavoriteRecordsList;
- (NSString *) newsDisplayItemEntityName;
- (NewsDisplayItem *) newsDisplayItemFromNewsDisplayDataModel:(NewsDisplayItemDataModel *) newsDisplayItemDataModel;
- (NewsDisplayItemDataModel *) insertNewsDisplayItemDataModelFromNewsDisplayItem:(NewsDisplayItem *) newsDisplayItem;
- (NewsDisplayItem *) newsDisplayItemWithNewsId:(NSString *) newsId;
- (NewsDisplayItemDataModel *) newsDisplayItemDataModelWithNewsId:(NSString *) newsId;

- (void) loadSearchKeywordsList;
- (NSString *) searchKeywordEntityName;
- (NewsSearchKeywordModel *) searchDataModelWithKeyword:(NSString *) keyword;

@end

@implementation DBCenterNewsExtend

- (id) init {
    if (self = [super init]) {
        [self loadLaunchingAdItemModel];
        [self loadReadRecordsList];
        [self loadFavoriteRecordsList];
        [self loadSearchKeywordsList];
    }
    return self;
}

#pragma mark -
#pragma mark Overwrite
- (NSURL *) modelURL {
    NSString *modelPath = [[NSBundle mainBundle] pathForResource:@"NewsModel" ofType:@"momd"];
    NSURL *modelURL = [NSURL URLWithString:modelPath];
    return modelURL;
}

- (NSURL *) storeURL {
    NSString *directoryPath = [self storeDirectoryPath];
    NSString *storePath = [directoryPath stringByAppendingPathComponent:@"NewsModel.sqlite"];
    return [NSURL fileURLWithPath:storePath];
}


#pragma mark -
#pragma mark Public Methods
+ (DBCenterNewsExtend *) sharedNewsDBCenter {
    static DBCenterNewsExtend *newsDBCenter = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        newsDBCenter = [[DBCenterNewsExtend alloc] init];
    });
    return newsDBCenter;
}

- (LaunchingAdItemModel *) launchingAdItem {
    return _launchingAdItemModel;
}

- (void) fullFillLaunchingAdItemModelWithLaunchingAdItem:(LaunchingAdItem *) launchingAdItem {
    if (!_launchingAdItemModel) {
        _launchingAdItemModel = [NSEntityDescription insertNewObjectForEntityForName:[self launchingAdEntityName] inManagedObjectContext:self.managedObjectContext];
        [self saveContext];
    }
    _launchingAdItemModel.adId = launchingAdItem.adId;
    _launchingAdItemModel.adTitle = launchingAdItem.adTitle;
    _launchingAdItemModel.adImgUrl = launchingAdItem.adImgUrl;
    _launchingAdItemModel.adWebUrl = launchingAdItem.adWebUrl;
    _launchingAdItemModel.adEndTime = launchingAdItem.adEndTime;
    [self saveContext];
}

- (void) saveLaunchingAdItemDataModel {
    [self saveContext];
}

- (void) removeLaunchingAdItem {
    [[self managedObjectContext] deleteObject:_launchingAdItemModel];
    _launchingAdItemModel = nil;
}

- (BOOL) hasReadWithNewsId:(NSString *) newsId {
    bool hasRead = NO;
    if ([self newsReadRecordItemModelWithNewsId:newsId]) {
        hasRead = YES;
    }
    return hasRead;
}

- (void) addReadRecordWithNewsId:(NSString *) newsId {
    if (![self newsReadRecordItemModelWithNewsId:newsId]) {
        
        NewsReadRecordItemModel *newsReadRecordItemModel = [NSEntityDescription insertNewObjectForEntityForName:[self newsReadRecordEntityName] inManagedObjectContext:self.managedObjectContext];
        newsReadRecordItemModel.newsId = newsId;
        [_mNewsReadRecordsList addObject:newsReadRecordItemModel];
        [self saveContext];
    }
}

/*新闻收藏记录*/
- (BOOL) hasFavoriteWithNewsId:(NSString *) newsId {
    for (NewsDisplayItem *newsDisplayItem in _mNewsDisplayItemList) {
        if (newsDisplayItem.newsDisplayParamItemList.count > 0) {
            NewsDisplayParamItem *displayParamItem = newsDisplayItem.newsDisplayParamItemList[0];
            if ([displayParamItem.newsId isEqualToString:newsId]) {
                return YES;
            }
        }
    }
    return NO;
}

- (void) addFavoriteRecordWithNewsDisplayItem:(NewsDisplayItem *) newsDisplayItem {
    NewsDisplayParamItem *newsDisplayParamItem;
    if (newsDisplayItem.newsDisplayParamItemList.count > 0) {
        newsDisplayParamItem = newsDisplayItem.newsDisplayParamItemList[0];
    }
    NSString *newsId = newsDisplayParamItem.newsId;
    if (![self hasFavoriteWithNewsId:newsId]) {
        [self insertNewsDisplayItemDataModelFromNewsDisplayItem:newsDisplayItem];
    }
}

- (void) removeFavoriteRecordWithNewsId:(NSString *) newsId {
    NewsDisplayItemDataModel *newsDisplayItemDataModel = [self newsDisplayItemDataModelWithNewsId:newsId];
    if (newsDisplayItemDataModel) {
        [[self managedObjectContext] deleteObject:newsDisplayItemDataModel];
        [self saveContext];
    }
    
    NewsDisplayItem *newsDisplayItem = [self newsDisplayItemWithNewsId:newsId];
    if (newsDisplayItem) {
        [_mNewsDisplayItemList removeObject:newsDisplayItem];
    }
}

- (NSArray *) favoriteNewsList {
    return _mNewsDisplayItemList;
}

/*搜索关键字列表*/
- (void) addSearchKeywordRecord:(NSString *) keyword {
    if (![self searchDataModelWithKeyword:keyword]) {
        NewsSearchKeywordModel *newsSearchKeywordModel = [NSEntityDescription insertNewObjectForEntityForName:[self searchKeywordEntityName] inManagedObjectContext:self.managedObjectContext];
        newsSearchKeywordModel.keyword = keyword;
        [_mSearchKeywordsList addObject:newsSearchKeywordModel];
        [self saveContext];
    }
}

- (NSArray *) keywordsList {
    NSMutableArray *mKeywordList = [[NSMutableArray alloc] init];
    for (NewsSearchKeywordModel *keywordModel in _mSearchKeywordsList) {
        [mKeywordList addObject:keywordModel.keyword];
    }
    return mKeywordList;
}

- (void) cleanKeywordsList {
    for (NewsSearchKeywordModel *searchKeywordModel in _mSearchKeywordsList) {
        [[self managedObjectContext] deleteObject:searchKeywordModel];
    }
    [_mSearchKeywordsList removeAllObjects];
    [self saveContext];
}

#pragma mark -
#pragma mark Public Methods
- (void) loadLaunchingAdItemModel {
    NSFetchRequest* request=[[NSFetchRequest alloc] init];
    NSEntityDescription* userItemDataModelDescription = [NSEntityDescription entityForName:[self launchingAdEntityName] inManagedObjectContext:self.managedObjectContext];
    [request setEntity:userItemDataModelDescription];
    NSArray* fetchResultList = [self.managedObjectContext executeFetchRequest:request error:nil];
    if (fetchResultList.count > 0) {
        _launchingAdItemModel = fetchResultList[0];
    }
}

- (NSString *) launchingAdEntityName {
    return @"LaunchingAdItemModel";
}

- (void) loadReadRecordsList {
    NSFetchRequest* request=[[NSFetchRequest alloc] init];
    NSEntityDescription* userItemDataModelDescription = [NSEntityDescription entityForName:[self newsReadRecordEntityName] inManagedObjectContext:self.managedObjectContext];
    [request setEntity:userItemDataModelDescription];
    NSArray* fetchResultList = [self.managedObjectContext executeFetchRequest:request error:nil];
    _mNewsReadRecordsList = [NSMutableArray arrayWithArray:fetchResultList];
}

- (NSString *) newsReadRecordEntityName {
    return @"NewsReadRecordItemModel";
}

- (NewsReadRecordItemModel *) newsReadRecordItemModelWithNewsId:(NSString *) newsId {
    for (NewsReadRecordItemModel *newsReadRecordItemModel in _mNewsReadRecordsList) {
        if ([newsReadRecordItemModel.newsId isEqualToString:newsId]) {
            return newsReadRecordItemModel;
        }
    }
    return nil;
}

- (void) loadFavoriteRecordsList {
    _mNewsDisplayModelList = [[NSMutableArray alloc] init];
    _mNewsDisplayItemList = [[NSMutableArray alloc] init];

    NSFetchRequest* request=[[NSFetchRequest alloc] init];
    NSEntityDescription* userItemDataModelDescription = [NSEntityDescription entityForName:[self newsDisplayItemEntityName] inManagedObjectContext:self.managedObjectContext];
    [request setEntity:userItemDataModelDescription];
    NSArray* fetchResultList = [self.managedObjectContext executeFetchRequest:request error:nil];
    _mNewsDisplayModelList = [NSMutableArray arrayWithArray:fetchResultList];

    for (NewsDisplayItemDataModel *newsDisplayItemDataModel in _mNewsDisplayModelList) {
        NewsDisplayItem *newsDisplayItem = [self newsDisplayItemFromNewsDisplayDataModel:newsDisplayItemDataModel];
        [_mNewsDisplayItemList addObject:newsDisplayItem];
    }
}

- (NSString *) newsDisplayItemEntityName {
    return @"NewsDisplayItemDataModel";
}

- (NewsDisplayItem *) newsDisplayItemFromNewsDisplayDataModel:(NewsDisplayItemDataModel *) newsDisplayItemDataModel {
    NewsDisplayItem *newsDisplayItem = [[NewsDisplayItem alloc] init];
    newsDisplayItem.displayType = [newsDisplayItemDataModel.displayType integerValue];
    newsDisplayItem.subscriptType = [newsDisplayItemDataModel.subscriptType integerValue];
    
    NewsDisplayParamItem *newsDisplayParamItem = [[NewsDisplayParamItem alloc] init];
    newsDisplayParamItem.newsId = newsDisplayItemDataModel.newsId;
    newsDisplayParamItem.newsTitle = newsDisplayItemDataModel.newsTitle;
    newsDisplayParamItem.newsBrief = newsDisplayItemDataModel.newsBrief;
    newsDisplayParamItem.newsDetailType = [newsDisplayItemDataModel.newsDetailType integerValue];
    newsDisplayParamItem.imagesList = [newsDisplayItemDataModel.newsImageList componentsSeparatedByString:@" "];

    newsDisplayItem.newsDisplayParamItemList = @[newsDisplayParamItem];
    
    return newsDisplayItem;
}

- (NewsDisplayItemDataModel *) insertNewsDisplayItemDataModelFromNewsDisplayItem:(NewsDisplayItem *) newsDisplayItem {
    NewsDisplayItemDataModel *newsDisplayItemDataModel = [NSEntityDescription insertNewObjectForEntityForName:[self newsDisplayItemEntityName] inManagedObjectContext:self.managedObjectContext];
    newsDisplayItemDataModel.displayType = @(newsDisplayItem.displayType);
    newsDisplayItemDataModel.subscriptType = @(newsDisplayItem.subscriptType);
    
    if (newsDisplayItem.newsDisplayParamItemList.count > 0) {
        NewsDisplayParamItem *newsDisplayParamItem = newsDisplayItem.newsDisplayParamItemList[0];
        
        newsDisplayItemDataModel.newsId = newsDisplayParamItem.newsId;
        newsDisplayItemDataModel.newsBrief = newsDisplayParamItem.newsBrief;
        newsDisplayItemDataModel.newsDetailType = @(newsDisplayParamItem.newsDetailType);
        newsDisplayItemDataModel.newsTitle = newsDisplayParamItem.newsTitle;
        
        NSMutableString *newsImageListString = [[NSMutableString alloc] init];
        for (int i = 0; i < newsDisplayParamItem.imagesList.count; i++) {
            NSString *imageUrl = newsDisplayParamItem.imagesList[i];
            [newsImageListString appendString:imageUrl];
            if (i < newsDisplayParamItem.imagesList.count - 1) {
                [newsImageListString appendString:@" "];
            }
        }
        newsDisplayItemDataModel.newsImageList = newsImageListString;
    }
    
    [_mNewsDisplayModelList addObject:newsDisplayItemDataModel];
    [_mNewsDisplayItemList addObject:newsDisplayItem];
    
    [self saveContext];

    return newsDisplayItemDataModel;
}

- (NewsDisplayItem *) newsDisplayItemWithNewsId:(NSString *) newsId {
    for (NewsDisplayItem *newsDisplayItem in _mNewsDisplayItemList) {
        if (newsDisplayItem.newsDisplayParamItemList.count > 0) {
            NewsDisplayParamItem *displayParamItem = newsDisplayItem.newsDisplayParamItemList[0];
            if ([displayParamItem.newsId isEqualToString:newsId]) {
                return newsDisplayItem;
            }
        }
    }
    return nil;
}

- (NewsDisplayItemDataModel *) newsDisplayItemDataModelWithNewsId:(NSString *) newsId {
    for (NewsDisplayItemDataModel *newsDisplayItemDataModel in _mNewsDisplayModelList) {
        if ([newsDisplayItemDataModel.newsId isEqualToString:newsId]) {
            return newsDisplayItemDataModel;
        }
    }
    return nil;
}

- (void) loadSearchKeywordsList {
    NSFetchRequest* request=[[NSFetchRequest alloc] init];
    NSEntityDescription* keywordModelDescription = [NSEntityDescription entityForName:[self searchKeywordEntityName] inManagedObjectContext:self.managedObjectContext];
    [request setEntity:keywordModelDescription];
    NSArray* fetchResultList = [self.managedObjectContext executeFetchRequest:request error:nil];
    _mSearchKeywordsList = [NSMutableArray arrayWithArray:fetchResultList];
}

- (NSString *) searchKeywordEntityName {
    return @"NewsSearchKeywordModel";
}

- (NewsSearchKeywordModel *) searchDataModelWithKeyword:(NSString *) keyword {
    for (NewsSearchKeywordModel *newsSearchKeywordModel in _mSearchKeywordsList) {
        if ([newsSearchKeywordModel.keyword isEqualToString:keyword]) {
            return newsSearchKeywordModel;
        }
    }
    return nil;
}

@end