连接一直提示No database selected，但是mysql 命令行查询数据库没有问题。

ERROR: An error occurred while trying to make a connection to the
database:

JDBC URL: jdbc:mysql://192.168.**.**:8066/

No database selected

Start by reproducing the connection using the reported JDBC URL, jdbc:mysql://192.168.**.**:8066/, and compare it with the working MySQL command-line connection. Trace the proxy's database-selection handling to determine what connection information is missing or interpreted differently; done means the connection succeeds with an explicitly identified database or the required configuration is clearly reported.

Written by the indexing model from the issue text.