FMDB存储模型对象（以二进制存储）用NSKeyedArchiver archivedDataWithRootObject序列号，NSKeyedUnarchiver unarchiveObjectWithData反序列化（重点坑是sql语句@"insert into t_newsWithChannel (nwesName,newsType) values (?,?)"）一定要用占位符

交友：微信号 dwjluck2013

一、封装FMDB单例

（1）JLFMDBHelp.h文件

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

 @interface JLFMDBHelp : NSObject

 @property(nonatomic,strong)NSString *fileName;//数据库名

 @property(nonatomic,strong)FMDatabase *database; //数据库对象

 + (JLFMDBHelp*)sharedFMDBHelp;
 //数据库存储路径
 - (NSString*)dbPath;
 //打开数据库
 - (void)openDB;
 //关闭数据库
 - (void)closeDB;
 //创建表
 - (void)dbCreateTable;
 //插入
 -(BOOL)insertDBWithData:(NSData *)newsData dbWithString:(NSString *)channelWithStr;
 //查询
 -(NSMutableArray *)selectDBWithChannel:(NSString *)channel;
 //给数据库命名
 - (void)createDBWithName:(NSString*)dbName;

 //无返回结果集的操作
 - (BOOL)notResultSetWithSql:(NSString*)sql;
 //查询操作
 - (NSArray*)qureyWithSql:(NSString*)sql;
 @end

（2）JLFMDBHelp.m文件

 #import "JLFMDBHelp.h"
 #import "JLMainViewsModel.h"

 @interface JLFMDBHelp()

 @end

 @implementation JLFMDBHelp

 + (JLFMDBHelp*)sharedFMDBHelp {
     static JLFMDBHelp *help = nil;
     static dispatch_once_t onceToken;
     dispatch_once(&onceToken, ^{
         help = [[JLFMDBHelp alloc] init];
     });
     return help;
 }

 #pragma amrk - 根据名称创建沙盒路径用来保存数据库文件
 - (NSString*)dbPath {
     //说明fileName不为空
     if (self.fileName.length) {
         //1.创建DB,路径
         NSString *documents = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
         NSString *filePath = [documents stringByAppendingPathComponent:@"channelNews.db"];
         return filePath;
     } else {
         return @"";
     }
 }

 #pragma mark - 让用户来命名数据库的名称
 - (void)createDBWithName:(NSString*)dbName {
     if (dbName.length == ) {
         //是防止用户直接传值为nil 或者 NULL
         self.fileName = @"";
     }else{
         self.fileName = [dbName stringByAppendingString:@".db"];
     }
 }

 #pragma mark - 创建数据库对象
 //懒加载
 - (FMDatabase*)database {
     if (!_database) {
         _database = [FMDatabase databaseWithPath:[self dbPath]];
     }
     return _database;
 }
 #pragma mark - 判断是否存在表
 - (BOOL) isTableOK:(NSString *)tableName
 {
     NSString *sqlStr = [NSString stringWithFormat:@"select count(*) as 'count' from sqlite_master where type ='table' and tbl_name = '%@';",tableName];
     FMResultSet *rs = [self.database executeQuery:sqlStr];
     while ([rs next])
     {
         NSInteger count = [rs intForColumn:@"count"];
         NSLog(@"isTableOK %ld", (long)count);

         if ( == count)
         {
             return NO;
         }
         else
         {
             return YES;
         }
     }
     return NO;
 }
 #pragma mark - 创建数据库表
 - (void)dbCreateTable {
     if([self.database open]){
         if (![self isTableOK:@"t_newsWithChannel"]) {
             NSString *sql = @"create table if not exists t_newsWithChannel (newsID integer primary key autoincrement,nwesName blob,newsType VARCHAR not null);";
             BOOL execResult = [self.database executeUpdate:sql];
             if(execResult){
                 NSLog(@"table ok");
             }else{
                 NSLog(@"table fail");
             }
         }
         [self closeDB];
     }else{
         NSLog(@"open fail");
     }
 }

 #pragma mark - 打开数据库的方法
 - (void)openDB {
     BOOL isOpen = [self.database open];
     if (isOpen) {
         NSLog(@"打开数据库成功");
     } else {
         NSLog(@"打开数据库失败");
     }
 }

 #pragma mark - 关闭数据库的方法
 - (void)closeDB {
     BOOL isClose = [self.database close];
     if (isClose) {
         NSLog(@"关闭数据库成功");
     } else {
         NSLog(@"关闭数据库失败");
     }
 }
 //插入
 -(BOOL)insertDBWithData:(NSData *)newsData dbWithString:(NSString *)channelWithStr{
     [self.database open];
     NSString *sql = [NSString stringWithFormat:@"insert into t_newsWithChannel (nwesName,newsType) values (?,?)"];
     BOOL execResult = [self.database executeUpdate:sql,newsData,channelWithStr];
     if(execResult){
         NSLog(@"insert ok");
         return YES;
     }else{
         NSLog(@"insert fail");
         return NO;
     }
 }
 //查询
 -(NSMutableArray *)selectDBWithChannel:(NSString *)channel{
     NSString *resultSql = [NSString stringWithFormat:@"select * from t_newsWithChannel where newsType = '%@'",channel];
     FMResultSet *set = [self.database executeQuery:resultSql];
     NSMutableArray *array = [NSMutableArray array];
     while ([set next]) {
         NSData *newsData = [set dataForColumn:@"nwesName"];
         JLMainViewsModel *model = [NSKeyedUnarchiver unarchiveObjectWithData:newsData];
         if (model) {
             [array addObject:model];
         }
     }
     return array;
 }
 @end

二、模型数据

(1)JLMainViewsModel.h文件

要遵守协议

@interface JLMainViewsModel : NSObject<NSCopying,NSCoding>

(2)JLMainViewsModel.m文件

 -(void)encodeWithCoder:(NSCoder *)aCoder{

     [aCoder encodeObject:self.fromSource forKey:@"fromSource"];
     [aCoder encodeObject:self.url forKey:@"url"];
     [aCoder encodeObject:self.title forKey:@"title"];
     [aCoder encodeObject:self.type forKey:@"type"];
     [aCoder encodeObject:self.newsTime forKey:@"newsTime"];
     [aCoder encodeObject:self.imageUrl forKey:@"imageUrl"];
     [aCoder encodeObject:self.imageArray forKey:@"imageArray"];
     [aCoder encodeObject:self.bigImageUrl forKey:@"bigImageUrl"];
     [aCoder encodeObject:self.bigImageArray forKey:@"bigImageArray"];
     [aCoder encodeObject:self.recommend forKey:@"recommend"];
     [aCoder encodeObject:self.exData forKey:@"exData"];
     [aCoder encodeObject:self.newsType forKey:@"newsType"];
     [aCoder encodeObject:self.style forKey:@"style"];
     [aCoder encodeObject:self.gzh forKey:@"gzh"];
     [aCoder encodeObject:self.uniqId forKey:@"uniqId"];
     [aCoder encodeObject:self.subdesc forKey:@"subdesc"];
     [aCoder encodeObject:self.autoplay forKey:@"autoplay"];
     [aCoder encodeObject:self.fromicon forKey:@"fromicon"];
     [aCoder encodeObject:self.webUrl forKey:@"webUrl"];
 }

 -(id)initWithCoder:(NSCoder *)aDecoder{
     if (self = [super init]) {
         self.fromSource = [aDecoder decodeObjectForKey:@"fromSource"];
         self.url = [aDecoder decodeObjectForKey:@"url"];
         self.title = [aDecoder decodeObjectForKey:@"title"];
         self.type = [aDecoder decodeObjectForKey:@"type"];
         self.newsTime = [aDecoder decodeObjectForKey:@"newsTime"];
         self.imageUrl = [aDecoder decodeObjectForKey:@"imageUrl"];
         self.imageArray = [aDecoder decodeObjectForKey:@"imageArray"];
         self.bigImageUrl = [aDecoder decodeObjectForKey:@"bigImageUrl"];
         self.bigImageArray = [aDecoder decodeObjectForKey:@"bigImageArray"];
         self.recommend = [aDecoder decodeObjectForKey:@"recommend"];
         self.exData = [aDecoder decodeObjectForKey:@"exData"];
         self.newsType = [aDecoder decodeObjectForKey:@"newsType"];
         self.style = [aDecoder decodeObjectForKey:@"style"];
         self.gzh = [aDecoder decodeObjectForKey:@"gzh"];
         self.uniqId = [aDecoder decodeObjectForKey:@"uniqId"];
         self.subdesc = [aDecoder decodeObjectForKey:@"subdesc"];
         self.autoplay = [aDecoder decodeObjectForKey:@"autoplay"];
         self.fromicon = [aDecoder decodeObjectForKey:@"fromicon"];
         self.webUrl = [aDecoder decodeObjectForKey:@"webUrl"];
     }
     return self;
 }

 - (id)copyWithZone:(NSZone *)zone
 {
     JLMainViewsModel *model = [[[self class] allocWithZone:zone]init];
     return model;
 }

三、存储数据  在网络请求成功后存储  只是存储时的代码

 //网络请求回调 成功
                 if(successBlock){
                     JLFMDBHelp *fmdbHelp = [JLFMDBHelp sharedFMDBHelp];
                     //数据库名
                     [fmdbHelp createDBWithName:@"t_newsWithChannel"];
                     //路径
                     NSString *filePath = [fmdbHelp dbPath];
                     //创建数据库表
                     [fmdbHelp dbCreateTable];

                     FMDatabaseQueue *queue = [FMDatabaseQueue databaseQueueWithPath:filePath];
                     [queue inDatabase:^(FMDatabase *db) {
                         [mArray enumerateObjectsUsingBlock:^(JLMainViewsModel * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
                             //将数组转换成字符串
                             NSData *newsData = [NSKeyedArchiver archivedDataWithRootObject:obj];
                             //插入
                             if ([fmdbHelp insertDBWithData:newsData dbWithString:chanl]) {
                                 [fmdbHelp closeDB];
                             }else{
                                 [fmdbHelp closeDB];
                             }
                         }];
                     }];

 //                    //1.获取存储的路径
 //                    NSString *documents = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
 //                    NSString *filePatha = [documents stringByAppendingPathComponent:@"newsModelWithArray.plist"];
 //                    //归档
 //                    [NSKeyedArchiver archiveRootObject:mArray toFile:filePatha];
 //                    NSLog(@"路径－－－－－%@",filePath);
                     successBlock(mArray.copy);
                 }

四、在需要用的vc中读取数据

 #pragma mark - 本地数据库中读取数据(模型对象)
 -(void)getdbDataSource{
     JLFMDBHelp *fmdbHelp = [JLFMDBHelp sharedFMDBHelp];
     //数据库名
     [fmdbHelp createDBWithName:@"channelNews"];
     //打开数据库
     [fmdbHelp openDB];

     NSMutableArray *mNewsArray = [fmdbHelp selectDBWithChannel:self.newsType];
     NSLog(@"%@",mNewsArray);
 }

重点：遇到的坑，存储数据的时候

NSString *sql = [NSString stringWithFormat:@"insert into t_newsWithChannel (nwesName,newsType) values (?,?)"];

values (?,?) 这里一定要用占位符，不能用values (%@,%@) 否则存储看不出问题，存储的数据却不对，反序列化的时候不会走model中的

-(id)initWithCoder:(NSCoder *)aDecoder方法