小编Str*_*aff的帖子

拿到

...'[] =':无法修改冻结的字符串(TypeError)

当试图修改我认为是ARGV [0]的副本时.

每个人的结果相同

arg = ARGV[ 0 ]
arg_cloned = ARGV[ 0 ].clone
arg_to_s = ARGV[ 0 ].to_s

arg[ 'x' ] = 'y'
arg_cloned[ 'x' ] = 'y'
arg_to_s[ 'x' ] = 'y'

使用 now() 进行简单数学运算时...

    mysql> 
select cdrstatuschangets from cdrs where ( cdrstatuschangets < now() - 10 );
    +---------------------+
    | cdrstatuschangets   |
    +---------------------+
    | 2009-09-25 13:55:50 |
    +---------------------+
    1 row in set (0.00 sec)

    show warnings;
    Empty set (0.00 sec)

它经常奏效，但有时，...

    mysql> 
select cdrstatuschangets from cdrs where ( cdrstatuschangets < now() - 50 );
    +---------------------+
    | cdrstatuschangets   |
    +---------------------+
    | 2009-09-25 13:55:50 |
    +---------------------+
    1 row in set, 1 warning (0.00 sec)


show warnings;
+---------+------+-----------------------------------------------------------------------+
| Level   | Code | Message | …