chore(g3fo-db-ops): sync SKILL.md and db_ops implementation from project

Made-with: Cursor

skills/g3fo-db-ops/scripts/db_ops.py

@@ -19,6 +19,8 @@ import json
 import os
 import sys
 from typing import Any, Optional
+from datetime import date, datetime, time
+from decimal import Decimal
 
 try:
     import mysql.connector
@@ -88,6 +90,16 @@ def get_connection(config: dict):
     )
 
 
+def _normalize_value(value: Any) -> Any:
+    """将 MySQL 返回的值转换为可 JSON 序列化的类型。"""
+    if isinstance(value, (datetime, date, time)):
+        return value.isoformat()
+    if isinstance(value, Decimal):
+        # 大多数场景下用 float 即可，避免 JSON 不支持 Decimal
+        return float(value)
+    return value
+
+
 def cmd_query(args: argparse.Namespace, config: dict) -> dict:
     """执行 SELECT 查询。"""
     conn = get_connection(config)
@@ -96,7 +108,10 @@ def cmd_query(args: argparse.Namespace, config: dict) -> dict:
         cursor.execute(args.sql, args.params or [])
         rows = cursor.fetchall()
         cursor.close()
-        return {"success": True, "data": rows, "rowCount": len(rows)}
+        normalized_rows = [
+            {k: _normalize_value(v) for k, v in row.items()} for row in rows
+        ]
+        return {"success": True, "data": normalized_rows, "rowCount": len(normalized_rows)}
     except MySQLError as e:
         return {"success": False, "error": str(e)}
     finally: