bug天天有，这个很特别：2个看起来完全一样的sql，查询结果却不一样

先看图

把mysql控制台的sql粘贴到这里

mysql> select * from dms_dictionary where code = "config_invoice_rule_time";

+--------------------------+-------------+-------+------+------+---------------------+---------------------+--------------------------------------------------------+
 | code                     | parent_code | level | type | name | create_time         | modify_time         |
 +--------------------------+-------------+-------+------+------+---------------------+---------------------+--------------------------------------------------------+
 | config_invoice_rule_time | 0           |     1 |   11 | 6    | 2019-05-09 17:28:18 | 2019-05-09 17:28:18 | 
 +--------------------------+-------------+-------+------+------+---------------------+---------------------+--------------------------------------------------------+
 1 row in set (0.00 sec)mysql> select * from dms_dictionary where code = "?config_invoice_rule_time";
 Empty set (0.00 sec)mysql> select * from dms_dictionary order by create_time desc limit 0,1;
 +--------------------------+-------------+-------+------+------+---------------------+---------------------+--------------------------------------------------------+
 | code                     | parent_code | level | type | name | create_time         | modify_time                                                     |
 +--------------------------+-------------+-------+------+------+---------------------+---------------------+--------------------------------------------------------+
 | config_invoice_rule_time | 0           |     1 |   11 | 6    | 2019-05-09 17:28:18 | 2019-05-09 17:28:18 
 +--------------------------+-------------+-------+------+------+---------------------+---------------------+--------------------------------------------------------+
 1 row in set (0.01 sec)

看得出，第2个sql "?config_invoice_rule_time" 存在1个“?”。

解决问题的过程：

2条sql完全一样，确实没啥特殊的地方。

Notepad++中，打开：显示所有符号，没看出问题

select * from dms_dictionary where code = "config_invoice_rule_time";
 select * from dms_dictionary where code = "⁢config_invoice_rule_time";
 select * from dms_dictionary order by create_time desc limit 0,1;

用第1个sql的“config_invoice_rule_time” 粘贴到第2个sql“config_invoice_rule_time”，显示查询正常。

说明，第2个sql的“config_invoice_rule_time” 有特殊的地方。

突然想到，可能是Unicode之类的问题。

通过工具

http://www.bejson.com/convert/unicode_chinese/

显示：

select * from dms_dictionary where code = "config_invoice_rule_time"%3b%0a
select * from dms_dictionary where code = "\u2062config_invoice_rule_time"%3b

第2个sql多了一个特殊字符“\u2062”

找资料了解了下，这是Unicode特殊字符，叫这个名字“invisible times”

详细解释

http://www.fileformat.info/info/unicode/char/2062/index.htm