Realm

#define PATH_OF_DOCUMENT    [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]


- (instancetype)init {
    if (self = [super init]) {

        _feedDBPath = [PATH_OF_DOCUMENT stringByAppendingPathComponent:@"feeds.sqlite"];
        if ([[NSFileManager defaultManager] fileExistsAtPath:_feedDBPath] == NO) {
            FMDatabase *db = [FMDatabase databaseWithPath:_feedDBPath];
            if ([db open]) {
                /*
                 unread：未读数
                 updatetime：最后更新时间用来排序
                 ishide：是否隐藏，0表示显示，1表示不显示
                 */
                NSString *createSql = @"create table feeds (fid INTEGER PRIMARY KEY AUTOINCREMENT  NOT NULL, title text, link text, des text, copyright text, generator text, imageurl text, feedurl text, unread integer, updatetime integer, ishide integer)";
                [db executeUpdate:createSql];
                /*
                 des：正文内容
                 isread：是否点开查看过，0表示没看过，1表示看过
                 isCached：是否缓存了内容
                 thumbnails：图片集，各个图片地址使用|作为分隔符
                 */
                NSString *createItemSql = @"create table feeditem (iid INTEGER PRIMARY KEY AUTOINCREMENT  NOT NULL, fid integer, link text, title text, author text, category text, pubdate text, des blob, isread integer, iscached integer, thumbnails text)";
                [db executeUpdate:createItemSql];
            }
        }
        
    }
    return self;
}