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