基于FMDB封装-直接存Model，取Model

项目中经常遇到数据持久化的问题，直接使用FMDB比较麻烦，我想直接存Model数据源，然后直接建表，存储。

思路是这样的：
1. 建表，传入Model的Class，根据Model的Class拿到Model里面的所有成员变量，然后把成员变量拼接成SQL语句，然后执行，根据Model的成员变量自动建表。
2. 存，传入装有Model数据的数组Arr，或者直接Model数据，使用Runtime拿到这个Model的键值对，然后拼接成插入SQL语句。
3. 取。取比较多样化，可以去整个表数据，也可以根据条件去取。当取到数据之后，弄成字典键值对。然后根据这个ModelClass创建对象，然后使用键值对给这个Model赋值，存入数组，然后传出。

1.建表

/**
 *  创建表
 *
 *  @param tabName 表名
 *  @param model   数据model
 *
 *  @return
 */
+ (instancetype)instantiationSqlTabName:(NSString *)tabName WithModelClass:(Class)modelClass{
    
    NSString* sql=[NSString stringWithFormat:@"create table if not exists %@ (id integer primary key autoincrement ",tabName];
    
    for (NSString *str in [modelClass GetPropertyKey]) {
        
        NSString *strq = [NSString stringWithFormat:@",%@ ",str];
        
        sql = [sql stringByAppendingString:strq];
    }
    
    sql = [sql stringByAppendingString:@")"];
    
    NSString *doc=[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
    
    NSString *fileName=[doc stringByAppendingPathComponent:[NSString stringWithFormat:@"sql.sqlite"]];
    
    NSLog(@"%@",fileName);
    
    ZCSqlTool *sqltool = [ZCSqlTool new];
    
    sqltool.db = [[FMDatabase alloc]initWithPath:fileName];
    
    if ([sqltool.db open]) {
        
        [sqltool.db executeUpdate:sql];
        
    }else{
        
        NSLog(@"创建失败");
    }
    
    return sqltool;
}

2.存

/**
 *  插入数据
 *
 *  @param tabName  表名
 *  @param data     数据
 *  @param isDelete 是否清空该表之前的数据
 *
 *  @return
 */
- (BOOL)insertDataTabName:(NSString *)tabName WithData:(id)data WithdeleteFrom:(BOOL)isDelete{
    
    if (isDelete == YES) {
        
        NSString *sql = [NSString stringWithFormat:@"delete from %@",tabName];
        
        BOOL isDeleteResult = [self.db executeUpdate:sql];
        
        if (isDeleteResult) {
            
            return [self carriedOutInsertDataTabName:tabName WithDatas:data];
            
        }else{
            
            NSLog(@"删除失败");
            
            return NO;
        }
    }
    
    return [self carriedOutInsertDataTabName:tabName WithDatas:data];
}

3.取

- (BOOL)conditionalDeletionTabName:(NSString *)tableName condition:(NSString *)condition,...NS_REQUIRES_NIL_TERMINATION{
    
    
    va_list ap;
    
    va_start(ap, condition);
    
    NSString *str;
    
    NSString *str1 = [[condition componentsSeparatedByString:@"="] firstObject];
    
    NSString *str2 = [[condition componentsSeparatedByString:@"="] lastObject];
    
    NSString *sqlStr = [NSString stringWithFormat:@"delete from %@ where %@ = \"%@\"",tableName,str1,str2];
    
    while ((str=va_arg(ap, NSString*))) {
        
        NSArray *arr = [str componentsSeparatedByString:@"="];
        
        if (arr.count == 2 && [[arr lastObject] length] > 0) {
            
            sqlStr = [NSString stringWithFormat:@"%@ and %@ = \"%@\"",sqlStr,[arr firstObject],[arr lastObject]];
            
        }else
        {
            NSLog(@"请输入正确格式的数据");
            
            return nil;
        }
    }
    
    va_end(ap);
    
    BOOL isInsertData;
    
    if ([self.db open]) {
        
        isInsertData = [self.db executeUpdate:sqlStr];
        
        [self.db close];
    }

    
    return isInsertData;
    
}

直接存入Model数据，取也是取得就是Model数组。超级方便。不管是缓存 还是其他 业务，两句代码搞定一切