标签：data file 查询 sele 因此 服务 ack throw ble
c# 连接 mysql数据库 弹出异常 Unknown system variable ‘lower_case_table_names‘
visual studio 2019
c# nuget mysql.data package from oracle
when connection open
throw exception ‘Unknown system variable ‘lower_case_table_names‘
本地mysql版本5.0.22
mysql> select version();
+---------------------+
| version() |
+---------------------+
| 5.0.22-community-nt |
+---------------------+
1 row in set (0.00 sec)
在navicat 中查询
select @@lower_case_table_names;
结果
[SQL] select @@lower_case_table_names;
[Err] 1193 - Unknown system variable ‘lower_case_table_names‘
看来是MySQL.data.dll提供的api 在使用之前需要查询MySQL设置lower_case_table_names，但是找不到，因此引起异常
【解决1】
在MySQL服务中加入该变量的设置
并重启
mysql> show variables;
low_priority_updates | OFF |
| lower_case_file_system | OFF |
| lower_case_table_names | 1 |
| max_allowed_packet | 1048576 |
| max_binlog_cache_size | 4294967295 |
| max_binlog_size | 1073741824 |
变量存在，但是——————————》
mysql> select @@lower_case_table_names
-> ;
ERROR 1193 (HY000): Unknown system variable ‘lower_case_table_names‘
【无效】
【解决2】
升级MySQL
mysql> select version();
+------------+
| version() |
+------------+
| 5.7.28-log |
+------------+
1 row in set (0.00 sec)
mysql> select @@lower_case_table_names;
+--------------------------+
| @@lower_case_table_names |
+--------------------------+
| 1 |
+--------------------------+
1 row in set (0.00 sec)
【问题解决！】
c# 连接 mysql数据库 弹出异常 Unknown system variable 'lower_case_table_names'
标签：data file 查询 sele 因此 服务 ack throw ble
原文地址：https://www.cnblogs.com/qianheng/p/11705976.html
