MCP DB Server

MCP DB Server

Enables AI agents to query databases via natural language using the Model Context Protocol, with automatic schema discovery, SQL query execution, and read-only safety checks.

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MCP DB Server

让 AI Agent 通过自然语言查询数据库的 MCP 服务器

基于 Model Context Protocol (MCP) 构建,提供只读数据库查询能力。支持自动 Schema 发现、SQL 查询执行、安全校验。

项目结构

mcp-db-server/
├── src/
│   ├── server.py     # MCP 服务入口 + 4 个工具
│   ├── db.py         # 数据库连接 + Schema 发现
│   └── safety.py     # SQL 安全校验(只读模式)
├── sample.db         # 示例 SQLite 数据库
├── .env              # 数据库连接配置
├── .env.example      # 配置模板
├── requirements.txt  # 依赖
├── setup_sample_db.py# 创建示例数据库
└── test_server.py    # 测试脚本

快速开始

⚡ 选择你的终端

根据你用的终端,Python 命令写法不同:

终端 命令
Git Bash(Claude Code 默认) /d/anaconda/python
PowerShell D:\anaconda\python.exe
cmd D:\anaconda\python.exe

以下所有命令以 Git Bash 为例,换成你的终端对应写法即可。

1. 安装依赖

pip install mcp python-dotenv

2. 配置数据库

编辑 .env 文件:

DATABASE_URL=sqlite:///sample.db

当前支持 SQLite。示例数据库包含 departmentsemployees 两张表。

3. 启动服务

# Git Bash:
/d/anaconda/python -m src.server
# PowerShell/cmd:
D:\anaconda\python.exe -m src.server

4. 用 MCP Inspector 调试(推荐)

# Git Bash:
/d/anaconda/Scripts/mcp dev src/server.py
# PowerShell/cmd:
D:\anaconda\Scripts\mcp.exe dev src/server.py

这会启动一个 Web 调试界面(http://localhost:5173),在浏览器中测试所有工具。

5. 集成到 Claude Desktop

在 Claude Desktop 的配置 claude_desktop_config.json 中添加:

{
  "mcpServers": {
    "mcp-db-server": {
      "command": "D:\\anaconda\\python.exe",
      "args": ["-m", "src.server"],
      "cwd": "C:\\Users\\86150\\source\\repos\\mcp-db-server"
    }
  }
}

可用工具

工具 参数 说明
list_tables 列出所有表名
get_schema table: string 查看指定表的结构
describe_db 查看完整数据库结构概览
query sql: string 执行 SELECT 查询

安全特性

  • 只读模式:仅允许 SELECT 语句,拦截 INSERT/UPDATE/DELETE/DROP 等
  • CTE 支持:允许 WITH ... SELECT 复杂查询
  • 错误提示:被拦截时会给出明确原因

测试验证

# Git Bash:
/d/anaconda/python test_server.py
# PowerShell/cmd:
D:\anaconda\python.exe test_server.py

简历项目描述

Database MCP Server — 基于 Model Context Protocol 构建的数据库查询代理服务器

  • 设计并实现了 MCP 协议服务端,提供 4 个标准化工具接口供 AI Agent 调用
  • 实现自动 Schema 发现,支持动态获取表结构和字段信息
  • 构建只读 SQL 安全校验层,防止 DDL/DML 操作,确保数据安全
  • 支持 SQLite,架构可扩展至 MySQL/PostgreSQL
  • 集成 Claude Desktop,实现自然语言驱动的数据库查询

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