style: format all Python files with Black

Apply Black formatter to the entire codebase for consistent code style.

Co-Authored-By: Claude (glm-5) <noreply@anthropic.com>

db/mysql_connection.py

@@ -40,13 +40,13 @@ class MySQLConnection(BaseDatabaseConnection):
 
         try:
             self.connection = mysql.connector.connect(
-                host=self.config.get('host', 'localhost'),
-                port=self.config.get('port', 3306),
-                database=self.config['database'],
-                user=self.config['username'],
-                password=self.config['password'],
-                charset=self.config.get('charset', 'utf8mb4'),
-                autocommit=False
+                host=self.config.get("host", "localhost"),
+                port=self.config.get("port", 3306),
+                database=self.config["database"],
+                user=self.config["username"],
+                password=self.config["password"],
+                charset=self.config.get("charset", "utf8mb4"),
+                autocommit=False,
             )
             print(
                 f"成功连接到 MySQL 数据库: {self.config.get('host', 'localhost')}"
@@ -153,7 +153,7 @@ class MySQLConnection(BaseDatabaseConnection):
         Returns:
             str: SQL query with MySQL-compatible placeholders
         """
-        return sql.replace('?', '%s')
+        return sql.replace("?", "%s")
 
     def _convert_table_names(self, sql: str) -> str:
         """
@@ -171,10 +171,10 @@ class MySQLConnection(BaseDatabaseConnection):
         import re
 
         # Convert [dbo].[TableName] to dbo_TableName
-        sql = re.sub(r'\[dbo\]\.\[([^\]]+)\]', r'dbo_\1', sql)
+        sql = re.sub(r"\[dbo\]\.\[([^\]]+)\]", r"dbo_\1", sql)
 
         # Remove square brackets from column names (e.g., [Column] -> Column)
-        sql = re.sub(r'\[([^\]]+)\]', r'\1', sql)
+        sql = re.sub(r"\[([^\]]+)\]", r"\1", sql)
 
         return sql