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 == 0) {
        //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 (0 == 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