如何从数据库中检索用户名,密码和角色,而不是在使用容器管理的安全性时从tomcat-user.xml中检索它们

SELECT User, Host, authentication_string, Select_priv, Insert_priv, Update_priv, Delete_priv, Create_priv, Drop_priv, Reload_priv, Shutdown_priv, Process_priv, File_priv, Grant_priv, References_priv, Index_priv, Alter_priv, Show_db_priv, Super_priv, Create_tmp_table_priv, Lock_tables_priv, Execute_priv, Repl_slave_priv, Repl_client_priv, Create_view_priv, Show_view_priv, Create_routine_priv, Alter_routine_priv, Create_user_priv, Event_priv, Trigger_priv, Create_tablespace_priv, ssl_type, ssl_cipher, x509_issuer, x509_subject, max_questions, max_updates, max_connections, max_user_connections, plugin, authentication_string_last_changed, password_last_changed, password_lifetime, account_locked, Create_role_priv, Drop_role_priv, Password_reuse_history, Password_reuse_time, Password_require_current, Password_expired, Is_role, Default_role, Max_statement_time, Max_statement_time_workload, Password_history FROM mysql.user WHERE User = 'your_username';

SELECT usename, passwd, rolname FROM pg_shadow JOIN pg_roles ON pg_shadow.usesysid = pg_roles.oid WHERE usename = 'your_username';

SELECT name, type_desc, authentication_type_desc, default_language_name, default_schema_name FROM sys.database_principals WHERE name = 'your_username';