feat:新增投顾agent和nl2sqlagent

nl2sql/rendering.py

@@ -0,0 +1,24 @@
+"""NL2SQL 查询结果的基础 Markdown 渲染。"""
+from __future__ import annotations
+
+from typing import Any
+
+
+def _cell(value: Any) -> str:
+    """将单元格转换为不会破坏 Markdown 表格的文本。"""
+    if value is None:
+        return ""
+    return str(value).replace("|", "\\|").replace("\r", " ").replace("\n", " ")
+
+
+def render_markdown(columns: list[str], rows: list[dict[str, Any]]) -> str:
+    """将列和行渲染成 Markdown 表格，空结果返回固定提示。"""
+    if not rows:
+        return "暂无数据。"
+    header = "| " + " | ".join(_cell(column) for column in columns) + " |"
+    divider = "| " + " | ".join("---" for _ in columns) + " |"
+    body = [
+        "| " + " | ".join(_cell(row.get(column)) for column in columns) + " |"
+        for row in rows
+    ]
+    return "\n".join([header, divider, *body])