NSString *sql = @"CREATE TABLE IF NOT EXISTS data ('id' INTEGER PRIMARY KEY AUTOINCREMENT  NOT NULL  UNIQUE, 'start' DATETIME, 'end' DATETIME);";
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
    NSMutableArray *array = [NSMutableArray array];
    [array addObject:sql];
    for (int i = 0; i < 10000; i++) {
        [array addObject:@"INSERT into data (start, end) VALUES (1, 2)"];
    }
    // execute sqls
    [HYDatabaseManager executeSqls:[array copy] finished:^(BOOL result) {
        NSLog(@"finished");
    }];
    // select sqls results is dictionarys
    [HYDatabaseManager selectSql:@"SELECT * FROM data" keys:@[@"start"] finished:^(NSArray *results) {
        NSLog(@"end");
    }];
    // select sqls results is models
    [HYDatabaseManager selectSql:@"SELECT * FROM data limit 20" class:Model.class keys:@[@"start"] finished:^(NSArray *results) {
        for (Model *model in results) {
            NSLog(@"%@", model.start);
        }
    }];
});