Initial Commit

pyqt6_scaffold/contrib/backends.py

@@ -0,0 +1,87 @@
+# SPDX-License-Identifier: LGPL-3.0-or-later
+
+import os
+from pyqt6_scaffold.core.logging import setup_logger
+from pyqt6_scaffold.core.database import AbstractDatabase
+
+log = setup_logger(__name__)
+
+class PostgresqlDatabase(AbstractDatabase):
+    """
+    AbstractDatabase implementation for PostgreSQL via psycopg2.
+
+    Configuration is read from environment variables:
+        PG_HOST, PG_PORT, PG_USER, PG_DATABASE, PG_PASSWORD
+
+    Requires:
+        pip install pyqt6-scaffold[postgres]
+    """
+    @property
+    def placeholder(self) -> str:
+        return "%s"
+
+    def _connect(self):
+        try:
+            import psycopg2 as pg
+        except ImportError:
+            log.error("Ошибка импорта psycopg2")
+            raise
+
+        DB_CONFIG = {
+            "host": os.getenv("PG_HOST", "127.0.0.1"),
+            "port": int(os.getenv("PG_PORT", 5432)),
+            "user": os.getenv("PG_USER", "postgres"),
+            "database": os.getenv("PG_DATABASE", "postgres"),
+            "password": os.getenv("PG_PASSWORD", "postgres")
+        }
+
+        return pg.connect(**DB_CONFIG)
+
+class MysqlDatabase(AbstractDatabase):
+    """
+    AbstractDatabase implementation for MySQL via pymysql.
+
+    Configuration is read from environment variables:
+        MYSQL_HOST, MYSQL_PORT, MYSQL_USER, MYSQL_DATABASE, MYSQL_PASSWORD
+
+    Requires:
+        pip install pyqt6-scaffold[mysql]
+    """
+    @property
+    def placeholder(self) -> str:
+        return "%s"
+
+    def _connect(self):
+        try:
+            import pymysql as pms
+        except ImportError:
+            log.error("Ошибка импорта pymysql")
+            raise
+
+        DB_CONFIG = {
+            "host": os.getenv("MYSQL_HOST", "localhost"),
+            "port": int(os.getenv("MYSQL_PORT", 3306)),
+            "user": os.getenv("MYSQL_USER", "root"),
+            "database": os.getenv("MYSQL_DATABASE", "root"),
+            "password": os.getenv("MYSQL_PASSWORD", "root")
+        }
+
+        return pms.connect(**DB_CONFIG)
+
+class SqliteDatabase(AbstractDatabase):
+    """
+    AbstractDatabase implementation for SQLite via the stdlib sqlite3 module.
+
+    Configuration is read from environment variables:
+        SQLITE_PATH  (default: app.db)
+
+    No additional dependencies required.
+    """
+    @property
+    def placeholder(self) -> str:
+        return "?"
+
+    def _connect(self):
+        import sqlite3
+        path = os.getenv("SQLITE_PATH", "app.db")
+        return sqlite3.connect(path)