RaigorJiang opened a new issue, #28918:
URL: https://github.com/apache/shardingsphere/issues/28918
## Bug Report
### Which version of ShardingSphere did you use?
master dd44eb00aba6f63efdba6feb8ddb5845fcc5152a
### Which project did you use? ShardingSphere-JDBC or ShardingSphere-Proxy?
ShardingSphere-Proxy
### Expected behavior
prompt `no database selected`
### Actual behavior
```sql
mysql> INSERT INTO t_order (order_id, user_id, status) VALUES
-> (1,1,'OK213521631237232');
ERROR 30000 (HY000): Unknown exception: Cannot invoke "String.toLowerCase()"
because "databaseName" is null
```
### Steps to reproduce the behavior, such as: SQL to execute, sharding rule
configuration, when exception occur etc.
1. Start proxy without any configuration file
2. Execute any DML statement
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