feat(mysql): 添加MySQL数据库支持

- 在requirements.txt中添加aiomysql依赖
- 在config.toml中添加MySQL配置块
- 新增MySQLModel配置模型
- 实现MySQLManager单例管理器
- 更新Config类以支持MySQL配置加载
- 在__init__.py中导出mysql_manager
- 改进ConfigError异常处理

core/managers/mysql_manager.py

@@ -0,0 +1,148 @@
+import aiomysql
+from ..config_loader import global_config as config
+from ..utils.logger import logger
+from ..utils.singleton import Singleton
+
+
+class MySQLManager(Singleton):
+    """
+    MySQL 数据库连接管理器（异步单例）
+    """
+    _pool = None
+
+    def __init__(self):
+        """
+        初始化 MySQL 管理器
+        """
+        super().__init__()
+
+    async def initialize(self):
+        """
+        异步初始化 MySQL 连接池并进行健康检查
+        """
+        if self._pool is None:
+            try:
+                mysql_config = config.mysql
+                host = mysql_config.host
+                port = mysql_config.port
+                user = mysql_config.user
+                password = mysql_config.password
+                db = mysql_config.db
+                charset = mysql_config.charset
+
+                logger.info(f"正在尝试连接 MySQL: {host}:{port}, DB: {db}")
+
+                self._pool = await aiomysql.create_pool(
+                    host=host,
+                    port=port,
+                    user=user,
+                    password=password,
+                    db=db,
+                    charset=charset,
+                    autocommit=False,
+                    maxsize=10,
+                    minsize=1
+                )
+
+                async with self._pool.acquire() as conn:
+                    async with conn.cursor() as cur:
+                        await cur.execute("SELECT 1")
+                        result = await cur.fetchone()
+                        if result and result[0] == 1:
+                            logger.success("MySQL 连接成功！")
+                        else:
+                            logger.error("MySQL 连接失败: 健康检查失败")
+            except Exception as e:
+                logger.exception(f"MySQL 初始化时发生未知错误: {e}")
+                self._pool = None
+
+    @property
+    def pool(self):
+        """
+        获取 MySQL 连接池实例
+        """
+        if self._pool is None:
+            raise ConnectionError("MySQL 未初始化或连接失败，请先调用 initialize()")
+        return self._pool
+
+    async def execute(self, sql: str, args: tuple = None):
+        """
+        执行 SQL 语句（用于 INSERT、UPDATE、DELETE）
+
+        Args:
+            sql: SQL 语句
+            args: 参数元组
+
+        Returns:
+            影响的行数
+        """
+        async with self._pool.acquire() as conn:
+            async with conn.cursor() as cur:
+                await cur.execute(sql, args)
+                await conn.commit()
+                return cur.rowcount
+
+    async def fetchone(self, sql: str, args: tuple = None):
+        """
+        查询单条记录
+
+        Args:
+            sql: SQL 语句
+            args: 参数元组
+
+        Returns:
+            单条记录字典
+        """
+        async with self._pool.acquire() as conn:
+            async with conn.cursor(aiomysql.DictCursor) as cur:
+                await cur.execute(sql, args)
+                return await cur.fetchone()
+
+    async def fetchall(self, sql: str, args: tuple = None):
+        """
+        查询多条记录
+
+        Args:
+            sql: SQL 语句
+            args: 参数元组
+
+        Returns:
+            记录列表
+        """
+        async with self._pool.acquire() as conn:
+            async with conn.cursor(aiomysql.DictCursor) as cur:
+                await cur.execute(sql, args)
+                return await cur.fetchall()
+
+    async def begin_transaction(self):
+        """
+        开始事务
+
+        Returns:
+            事务连接对象
+        """
+        conn = await self._pool.acquire()
+        return conn
+
+    async def commit_transaction(self, conn):
+        """
+        提交事务
+
+        Args:
+            conn: 事务连接对象
+        """
+        await conn.commit()
+        await self._pool.release(conn)
+
+    async def rollback_transaction(self, conn):
+        """
+        回滚事务
+
+        Args:
+            conn: 事务连接对象
+        """
+        await conn.rollback()
+        await self._pool.release(conn)
+
+
+mysql_manager = MySQLManager()