【软件安全】四种mysql注释实例

mysql注释方法一:使用#

mysql>

mysql> SELECT 1+1; # This comment continues to the end of line

+-----+

| 1+1 |

+-----+

| 2 |

+-----+

1 row in set (0.00 sec)

mysql>

mysql注释方法二:使用--

mysql>

mysql> SELECT 1+1; -- This comment continues to the end of line

+-----+

| 1+1 |

+-----+

| 2 |

+-----+

1 row in set (0.00 sec)

mysql注释方法三:使用/* */

mysql>

mysql>

mysql> SELECT 1 /* this is an in-line comment */ + 1;

+---------+

| 1 + 1 |

+---------+

| 2 |

+---------+

1 row in set (0.00 sec)

mysql> SELECT 1+

-> /*

/*> this is a

/*> multiple-line comment

/*> */

-> 1;

+-------+

| 1+

1 |

+-------+

| 2 |

+-------+

1 row in set (0.00 sec)

mysql>

mysql注释方法四:使用/*! */

mysql>

mysql>

mysql> CREATE /*!32302 TEMPORARY */ TABLE t (a INT);

Query OK, 0 rows affected (0.02 sec)

mysql>

mysql> desc t;

+-------+---------+------+-----+---------+-------+

| Field | Type | Null | Key | Default | Extra |

+-------+---------+------+-----+---------+-------+

| a | int(11) | YES | | NULL | |

+-------+---------+------+-----+---------+-------+

1 row in set (0.00 sec)

mysql>

mysql>

mysql> drop table t;

Query OK, 0 rows affected (0.00 sec)

mysql>

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