Added demo for SQL Support

src/cpl_core/database/connection/database_connection.py

@@ -8,6 +8,7 @@ from cpl_core.database.connection.database_connection_abc import \
 from cpl_core.database.database_settings import DatabaseSettings
 from cpl_core.utils import CredentialManager
 from mysql.connector.abstracts import MySQLConnectionAbstract
+from mysql.connector.cursor import MySQLCursorBuffered
 
 
 class DatabaseConnection(DatabaseConnectionABC):
@@ -17,15 +18,30 @@ class DatabaseConnection(DatabaseConnectionABC):
     def __init__(self):
         DatabaseConnectionABC.__init__(self)
 
-        self._database_server: Optional[MySQLConnectionAbstract] = None
+        self._database: Optional[MySQLConnectionAbstract] = None
+        self._cursor: Optional[MySQLCursorBuffered] = None
         
     @property
     def server(self) -> MySQLConnectionAbstract:
-        return self._database_server
+        return self._database
+    
+    @property
+    def cursor(self) -> MySQLCursorBuffered:
+        return self._cursor
 
     def connect(self, database_settings: DatabaseSettings):
         try:
-            self._database_server = sql.connect(
+            connection = sql.connect(
+                host=database_settings.host,
+                user=database_settings.user,
+                passwd=CredentialManager.decrypt(database_settings.password),
+                charset=database_settings.charset,
+                use_unicode=database_settings.use_unicode,
+                buffered=database_settings.buffered,
+                auth_plugin=database_settings.auth_plugin
+            )
+            connection.cursor().execute(f'CREATE DATABASE IF NOT EXISTS `{database_settings.database}`;')
+            self._database = sql.connect(
                 host=database_settings.host,
                 user=database_settings.user,
                 passwd=CredentialManager.decrypt(database_settings.password),
@@ -35,6 +51,7 @@ class DatabaseConnection(DatabaseConnectionABC):
                 buffered=database_settings.buffered,
                 auth_plugin=database_settings.auth_plugin
             )
+            self._cursor = self._database.cursor()
             Console.set_foreground_color(ForegroundColorEnum.green)
             Console.write_line(f'[{__name__}] Connected to database')
             Console.set_foreground_color(ForegroundColorEnum.default)

src/cpl_core/database/connection/database_connection_abc.py

@@ -2,6 +2,7 @@ from abc import ABC, abstractmethod
 
 from cpl_core.database.database_settings import DatabaseSettings
 from mysql.connector.abstracts import MySQLConnectionAbstract
+from mysql.connector.cursor import MySQLCursorBuffered
 
 
 class DatabaseConnectionABC(ABC):
@@ -14,6 +15,10 @@ class DatabaseConnectionABC(ABC):
     @abstractmethod
     def server(self) -> MySQLConnectionAbstract: pass
     
+    @property
+    @abstractmethod
+    def cursor(self) -> MySQLCursorBuffered: pass
+    
     @abstractmethod
     def connect(self, database_settings: DatabaseSettings):
         r"""Connects to a database by connection string

src/cpl_core/database/context/database_context.py

@@ -8,6 +8,7 @@ from cpl_core.database.connection.database_connection_abc import \
 from cpl_core.database.context.database_context_abc import DatabaseContextABC
 from cpl_core.database.database_settings import DatabaseSettings
 from cpl_core.database.table_abc import TableABC
+from mysql.connector.cursor import MySQLCursorBuffered
 
 
 class DatabaseContext(DatabaseContextABC):
@@ -22,21 +23,22 @@ class DatabaseContext(DatabaseContextABC):
         DatabaseContextABC.__init__(self, database_settings)
 
         self._db: DatabaseConnectionABC = DatabaseConnection()
-        self._cursor: Optional[str] = None
         self._tables: list[TableABC] = TableABC.__subclasses__()
 
     @property
-    def cursor(self):
-        return self._cursor
-
+    def cursor(self) -> MySQLCursorBuffered:
+        return self._db.cursor
+    
     def connect(self, database_settings: DatabaseSettings):
         self._db.connect(database_settings)
-        c = self._db.server.cursor()
-        self._cursor = c
         Console.write_line(f"Ts: {self._tables}")
         for table in self._tables:
-            Console.write_line(f"{table}, {table.create_string}")
-            c.execute(table.create_string)
+            Console.write_line(f"{table}, {table.get_create_string()}")
+            self._db.cursor.execute(table.get_create_string())
 
     def save_changes(self):
         self._db.server.commit()
+        
+    def select(self, statement: str) -> list:
+        self._db.cursor.execute(statement)
+        return self._db.cursor.fetchall()

src/cpl_core/database/context/database_context_abc.py

@@ -1,6 +1,7 @@
 from abc import ABC, abstractmethod
 
 from cpl_core.database.database_settings import DatabaseSettings
+from mysql.connector.cursor import MySQLCursorBuffered
 
 
 class DatabaseContextABC(ABC):
@@ -11,9 +12,9 @@ class DatabaseContextABC(ABC):
         pass
 
     @property
-    @abstractmethod
-    def cursor(self): pass
-
+    def cursor(self) -> MySQLCursorBuffered:
+        return self._cursor
+    
     @abstractmethod
     def connect(self, database_settings: DatabaseSettings):
         r"""Connects to a database by connection settings
@@ -23,7 +24,22 @@ class DatabaseContextABC(ABC):
             database_settings :class:`cpl_core.database.database_settings.DatabaseSettings`
         """
         pass
-
+    
+    @abstractmethod
     def save_changes(self):
         r"""Saves changes of the database"""
         pass
+    
+    @abstractmethod
+    def select(self, statement: str) -> list:
+        r"""Runs SQL Statements
+        
+        Parameter
+        ---------
+            statement: :class:`str`
+        
+        Returns
+        -------
+            list: Fetched list of selected elements
+        """
+        pass

src/cpl_core/database/table_abc.py

@@ -18,9 +18,9 @@ class TableABC(ABC):
     def LastModifiedAt(self) -> datetime:
         return self._modified_at
     
-    @property
+    @staticmethod
     @abstractmethod
-    def create_string(self) -> str: pass
+    def get_create_string() -> str: pass
     
     @property
     @abstractmethod