Improved structure and added basics for database module

src/tests_dev/appsettings.development.json

@@ -4,5 +4,11 @@
     "Filename": "log_$start_time.log",
     "ConsoleLogLevel": "TRACE",
     "FileLogLevel": "TRACE"
+  },
+
+  "DatabaseSettings": {
+    "ConnectionString": "mysql+mysqlconnector://sh_messenger_server:$credentials@localhost/sh_messenger_server",
+    "Credentials": "ZkM1U1dyU0hXM3oyI3BfXg==",
+    "Encoding": "utf8mb4"
   }
 }

src/tests_dev/program.py

@@ -1,11 +1,13 @@
 from typing import Optional
 
 from sh_edraft.configuration.base import ConfigurationBase
+from sh_edraft.database import DatabaseConnection
+from sh_edraft.database.base import DatabaseConnectionBase
 from sh_edraft.hosting import ApplicationHost
 from sh_edraft.hosting.base import ApplicationBase
 from sh_edraft.logging import Logger
 from sh_edraft.logging.base import LoggerBase
-from sh_edraft.service.base import ServiceProviderBase
+from sh_edraft.service.providing.base import ServiceProviderBase
 
 
 class Program(ApplicationBase):
@@ -17,6 +19,7 @@ class Program(ApplicationBase):
         self._services: Optional[ServiceProviderBase] = None
         self._configuration: Optional[ConfigurationBase] = None
         self._logger: Optional[LoggerBase] = None
+        self._db_connection: Optional[DatabaseConnectionBase] = None
 
     def create_application_host(self):
         self._app_host = ApplicationHost()
@@ -30,13 +33,19 @@ class Program(ApplicationBase):
         self._configuration.add_argument_variables()
         self._configuration.add_json_file(f'appsettings.json')
         self._configuration.add_json_file(f'appsettings.{self._configuration.environment.environment_name}.json')
-        self._configuration.add_json_file(f'appsettings.{self._configuration.environment.host_name}.json', optional=True)
+        self._configuration.add_json_file(
+            f'appsettings.{self._configuration.environment.host_name}.json',
+            optional=True
+        )
 
     def create_services(self):
         self._services.create()
         self._services.add_singleton(LoggerBase, Logger)
-        self._logger = self._services.get_service(LoggerBase)
+        self._services.add_singleton(DatabaseConnectionBase, DatabaseConnection)
+        self._logger: Logger = self._services.get_service(LoggerBase)
         self._logger.create()
+        self._db_connection: DatabaseConnection = self._services.get_service(DatabaseConnectionBase)
+        self._db_connection.create()
 
     def main(self):
         self._logger.header(f'{self._configuration.environment.application_name}:')