This functional add on mysql3.22.7 version. use the /*! ... */ syntax to hide MySQL-specific keywords when you write portable code. MySQL will parse the code inside the comments as if the surrounding /*! and */ comment characters didn't exist.
调试欢乐多
mysql> select version();
+-----------+
| version() |
+-----------+
| 4.0.12-nt |
+-----------+
1 row in set (0.00 sec)mysql> select /*!40012 1*/ from author;
+---+
| 1 |
+---+
| 1 |
| 1 |
| 1 |
| 1 |
| 1 |
| 1 |
| 1 |
+---+
7 rows in set (0.00 sec)mysql> select /*!40013 1*/ from author;
ERROR 1064: You have an error in your SQL syntax. Check the manual that corresp
onds to your MySQL server version for the right syntax to use near 'from author'
at line 1
当“/*!”后面的数字大于版本号的时候MySQL就不会处理注释符里的内容。