mysql> use bbs_user;
Database changed
mysql> create table one(
    -> id int unsigned not null auto_increment primary key,
    -> username varchar(32)
    -> );
Query OK, 0 rows affected (0.01 sec)

mysql> show create table one;
+-------+-----------------------------------------------------------------------
--------------------------------------------------------------------------------
-----------------+
| Table | Create Table

                 |
+-------+-----------------------------------------------------------------------
--------------------------------------------------------------------------------
-----------------+
| one   | CREATE TABLE `one` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `username` varchar(32) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 |
+-------+-----------------------------------------------------------------------
--------------------------------------------------------------------------------
-----------------+
1 row in set (0.01 sec)

mysql> create table two(
    -> id int unsigned not null auto_increment primary key,
    -> username varchar(32)
    -> )engine=innodb default charset=utf8;
Query OK, 0 rows affected (0.02 sec)

mysql> show create table two;
+-------+-----------------------------------------------------------------------
--------------------------------------------------------------------------------
-----------------+
| Table | Create Table

                 |
+-------+-----------------------------------------------------------------------
--------------------------------------------------------------------------------
-----------------+
| two   | CREATE TABLE `two` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `username` varchar(32) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 |
+-------+-----------------------------------------------------------------------
--------------------------------------------------------------------------------
-----------------+
1 row in set (0.00 sec)
 

主要是自己沒有學會更改innodb設定  手動設定myisam=innodb   還挺有意思；