ommysql mostly uses the "old style" configuration, with almost everything on the action line itself. A few newer features are being migrated to the new style-config directive configuration system.
* $ActionOmmysqlServerPort <port>
Permits to select a non-standard port for the MySQL server. The default is 0, which means the system default port is used. There is no need to specify this directive unless you know the server is running on a non-standard listen port.
* $OmMySQLConfigFile <file name>
Permits the selection of an optional MySQL Client Library configuration file (my.cnf) for extended configuration functionality. The use of this configuration directive is necessary only if you have a non-standard environment or if fine-grained control over the database
connection is desired.
* $OmMySQLConfigSection <string>
Permits the selection of the section within the configuration file specified by the $OmMySQLConfigFile directive.
This will likely only be used where the database administrator provides a single configuration file with multiple profiles.
This configuration directive is ignored unless $OmMySQLConfigFile is also used in the rsyslog configration file.
If omitted, the MySQL Client Library default of "client" will be used.
，汗，我用中文的：号表示