Mysql 的缺省enginess

Mysqlclient 下：

show engines;
| MyISAM     | YES     | Default engine as of MySQL 3.23 with great performance
        |
| MEMORY     | YES     | Hash based, stored in memory, useful for temporary tabl
es      |
| InnoDB     | DEFAULT | Supports transactions, row-level locking, and foreign k
eys     |
| BerkeleyDB | NO      | Supports transactions and page-level locking
        |
| BLACKHOLE  | NO      | /dev/null storage engine (anything you write to it disa
ppears) |
| EXAMPLE    | NO      | Example storage engine
        |
| ARCHIVE    | YES     | Archive storage engine
        |
| CSV        | NO      | CSV storage engine
        |
| ndbcluster | NO      | Clustered, fault-tolerant, memory-based tables
        |
| FEDERATED  | NO      | Federated MySQL storage engine
        |
| MRG_MYISAM | YES     | Collection of identical MyISAM tables
        |
| ISAM       | NO      | Obsolete storage engine
        |
+------------+---------+--------------------------------------------------------
--------+

Mysql 5.0以前是MyISAM   自动提交这样的效率比较快但是无法 回滚

应该使用 InnoDB