Renamed project

src/cpl_core/database/context/__init__.py

@@ -0,0 +1,27 @@
+# -*- coding: utf-8 -*-
+
+"""
+sh_cpl-core sh-edraft Common Python library
+~~~~~~~~~~~~~~~~~~~
+
+sh-edraft Common Python library
+
+:copyright: (c) 2020 - 2021 sh-edraft.de
+:license: MIT, see LICENSE for more details.
+
+"""
+
+__title__ = 'cpl_core.database.context'
+__author__ = 'Sven Heidemann'
+__license__ = 'MIT'
+__copyright__ = 'Copyright (c) 2020 - 2021 sh-edraft.de'
+__version__ = '2021.10.6'
+
+from collections import namedtuple
+
+# imports:
+from .database_context import DatabaseContext
+from .database_context_abc import DatabaseContextABC
+
+VersionInfo = namedtuple('VersionInfo', 'major minor micro')
+version_info = VersionInfo(major='2021', minor='10', micro='6')

src/cpl_core/database/context/database_context.py

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+from sqlalchemy import engine, Table
+from sqlalchemy.orm import Session
+
+from cpl.console.console import Console
+from cpl.console.foreground_color_enum import ForegroundColorEnum
+from cpl.database.connection.database_connection import DatabaseConnection
+from cpl.database.connection.database_connection_abc import DatabaseConnectionABC
+from cpl.database.context.database_context_abc import DatabaseContextABC
+from cpl.database.database_settings import DatabaseSettings
+from cpl.database.database_model import DatabaseModel
+
+
+class DatabaseContext(DatabaseContextABC):
+    r"""Representation of the database context
+
+    Parameter
+    ---------
+        database_settings: :class:`cpl.database.database_settings.DatabaseSettings`
+    """
+
+    def __init__(self, database_settings: DatabaseSettings):
+        DatabaseContextABC.__init__(self)
+
+        self._db: DatabaseConnectionABC = DatabaseConnection(database_settings)
+        self._tables: list[Table] = []
+
+    @property
+    def engine(self) -> engine:
+        return self._db.engine
+
+    @property
+    def session(self) -> Session:
+        return self._db.session
+
+    def connect(self, connection_string: str):
+        self._db.connect(connection_string)
+        self._create_tables()
+
+    def save_changes(self):
+        self._db.session.commit()
+
+    def _create_tables(self):
+        try:
+            for subclass in DatabaseModel.__subclasses__():
+                self._tables.append(subclass.__table__)
+
+            DatabaseModel.metadata.drop_all(self._db.engine, self._tables)
+            DatabaseModel.metadata.create_all(self._db.engine, self._tables, checkfirst=True)
+            Console.set_foreground_color(ForegroundColorEnum.green)
+            Console.write_line(f'[{__name__}] Created tables')
+            Console.set_foreground_color(ForegroundColorEnum.default)
+        except Exception as e:
+            Console.set_foreground_color(ForegroundColorEnum.red)
+            Console.write_line(f'[{__name__}] Creating tables failed -> {e}')
+            Console.set_foreground_color(ForegroundColorEnum.default)
+            exit()

src/cpl_core/database/context/database_context_abc.py

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+from abc import abstractmethod, ABC
+
+from sqlalchemy import engine
+from sqlalchemy.orm import Session
+
+
+class DatabaseContextABC(ABC):
+    r"""ABC for the :class:`cpl.database.context.database_context.DatabaseContext`"""
+
+    @abstractmethod
+    def __init__(self, *args):
+        pass
+
+    @property
+    @abstractmethod
+    def engine(self) -> engine: pass
+
+    @property
+    @abstractmethod
+    def session(self) -> Session: pass
+
+    @abstractmethod
+    def connect(self, connection_string: str):
+        r"""Connects to a database by connection string
+
+        Parameter
+        ---------
+            connection_string: :class:`str`
+                Database connection string, see: https://docs.sqlalchemy.org/en/14/core/engines.html
+        """
+        pass
+
+    def save_changes(self):
+        r"""Saves changes of the database"""
+        pass
+
+    @abstractmethod
+    def _create_tables(self):
+        r"""Create all tables for application from database model"""
+        pass