TextToSql——Vanna的安装与使用

Vanna 2.0是一个用户感知的AI代理框架，它将LLM连接到您的数据库，让您和数据库聊天。

安装 Vanna 依赖

powershell 复制代码

pip install 'vanna[fastapi,httpx,mysql,ollama]'

准备

本文示例需要读者提前安装好 Ollama，并下载 gpt-oss:20b 模型。

其次还要安装好MySQL并建立好数据库和表。

本文示例所用数据库中的表信息如下

其中employees中数据如下

编写 python 代码

python 复制代码

from vanna import Agent
from vanna.core.registry import ToolRegistry
from vanna.core.user import UserResolver, User, RequestContext
from vanna.tools import RunSqlTool, VisualizeDataTool
from vanna.tools.agent_memory import SaveQuestionToolArgsTool, SearchSavedCorrectToolUsesTool, SaveTextMemoryTool
from vanna.servers.fastapi import VannaFastAPIServer
from vanna.integrations.ollama import OllamaLlmService
from vanna.integrations.mysql import MySQLRunner
from vanna.integrations.local.agent_memory import DemoAgentMemory

# 配置大模型
llm = OllamaLlmService(
    model="gpt-oss:20b",
    host="http://localhost:11434"
)

# 配置数据库，根据实际情况修改配置
db_tool = RunSqlTool(
    sql_runner=MySQLRunner(
        host="localhost",
        database="demo",
        user="root",
        password="123",
        port=3306
    )
)

# 配置agent记忆
agent_memory = DemoAgentMemory(max_items=1000)

# 配置用户认证
class SimpleUserResolver(UserResolver):
    async def resolve_user(self, request_context: RequestContext) -> User:
        user_email = request_context.get_cookie('vanna_email') or 'guest@example.com'
        group = 'admin' if user_email == 'admin@example.com' else 'user'
        return User(id=user_email, email=user_email, group_memberships=[group])

user_resolver = SimpleUserResolver()

# 创建agent
tools = ToolRegistry()
tools.register_local_tool(db_tool, access_groups=['admin', 'user'])
tools.register_local_tool(SaveQuestionToolArgsTool(), access_groups=['admin'])
tools.register_local_tool(SearchSavedCorrectToolUsesTool(), access_groups=['admin', 'user'])
tools.register_local_tool(SaveTextMemoryTool(), access_groups=['admin', 'user'])
tools.register_local_tool(VisualizeDataTool(), access_groups=['admin', 'user'])

agent = Agent(
    llm_service=llm,
    tool_registry=tools,
    user_resolver=user_resolver,
    agent_memory=agent_memory
)

# 运行服务
server = VannaFastAPIServer(agent)
server.run(port=8011)  # 访问 http://localhost:8011

访问Vanna

例如输入

demo数据库中有哪些表

输出

例如输入

23岁的员工都有谁

输出