refactor: database.py 添加 MySQL 连接池管理

src/vitals/core/database.py

@@ -1,40 +1,61 @@
-"""SQLite 数据库操作"""
+"""数据库操作 - 支持 MySQL"""
 
 import json
 import os
-import sqlite3
 from contextlib import contextmanager
 from datetime import date, time, datetime, timedelta
 from pathlib import Path
 from typing import Optional
 
+import mysql.connector
+from mysql.connector import pooling
+
 from .models import Exercise, Meal, Sleep, Weight, UserConfig, User, Reading, Invite
 
 
-def get_db_path() -> Path:
-    """获取数据库路径（支持环境变量配置）"""
-    # 优先使用环境变量
-    env_path = os.environ.get("VITALS_DB_PATH")
-    if env_path:
-        db_path = Path(env_path)
-        db_path.parent.mkdir(parents=True, exist_ok=True)
-        return db_path
+# 数据库连接池（全局）
+_connection_pool = None
 
-    # 默认路径
-    db_dir = Path.home() / ".vitals"
-    db_dir.mkdir(exist_ok=True)
-    return db_dir / "vitals.db"
+
+def get_mysql_config() -> dict:
+    """获取 MySQL 配置"""
+    return {
+        "host": os.environ.get("MYSQL_HOST", "localhost"),
+        "port": int(os.environ.get("MYSQL_PORT", "3306")),
+        "user": os.environ.get("MYSQL_USER", "vitals"),
+        "password": os.environ.get("MYSQL_PASSWORD", ""),
+        "database": os.environ.get("MYSQL_DATABASE", "vitals"),
+    }
+
+
+def init_connection_pool():
+    """初始化数据库连接池"""
+    global _connection_pool
+    if _connection_pool is None:
+        config = get_mysql_config()
+        _connection_pool = pooling.MySQLConnectionPool(
+            pool_name="vitals_pool",
+            pool_size=5,
+            pool_reset_session=True,
+            **config
+        )
+    return _connection_pool
 
 
 @contextmanager
 def get_connection():
     """获取数据库连接"""
-    conn = sqlite3.connect(get_db_path())
-    conn.row_factory = sqlite3.Row
+    pool = init_connection_pool()
+    conn = pool.get_connection()
     try:
-        yield conn
+        cursor = conn.cursor(dictionary=True)
+        yield conn, cursor
         conn.commit()
+    except Exception:
+        conn.rollback()
+        raise
     finally:
+        cursor.close()
         conn.close()