dynamic-db-mcp-server
Enables AI agents to dynamically register and query MySQL-compatible databases at runtime with built-in destructive SQL protection.
README
dynamic-db-mcp-server
动态注册的 MySQL 兼容数据库 MCP Server. 运行时注册数据库连接, 执行 SQL 时自带破坏性语句拦截.
为什么造这个轮子
传统的数据库 MCP Server 要求把所有连接配置事先写进环境变量或配置文件. 这在以下场景不现实:
- 有几十/上百个数据库实例
- 实例 IP 经常变动
- 不想维护一份静态配置文件
- 需要 AI 动态发现并连接数据库
dynamic-db-mcp-server 翻转了模型: 连接在运行时通过工具调用注册. AI 提供 host/port/user/password, Server 测试连接, 缓存它, 返回 instance_id 供后续查询使用.
特性
- 动态注册 — 无需预配置连接列表, 运行时注册任意 MySQL 兼容数据库
- 连接复用 — 注册的连接会被缓存, 不重复握手
- SQL 安全 — 只读查询 (SELECT/SHOW/WITH/EXPLAIN/DESC) 直接执行; 破坏性语句 (DROP/DELETE/UPDATE/INSERT/ALTER/TRUNCATE) 需显式确认; 危险语句 (OUTFILE/DUMPFILE/LOAD_FILE/SHUTDOWN) 一律拒绝
- MySQL 协议兼容 — 适用于 MySQL, MariaDB, TDSQL, TDSQL-C 等任何使用 MySQL 线协议的数据库
- 配置无敏感数据 — 无硬编码凭据, 所有连接均为运行时提供
- 无状态 — 连接存在于 MCP 进程内存中, 重启即清空
快速开始
安装
pip install dynamic-db-mcp-server
或通过 uv / uvx 运行:
uvx dynamic-db-mcp-server
在 MCP 客户端中配置
在你的 MCP 客户端配置中添加 (如 opencode.jsonc, claude_desktop_config.json):
{
"mcpServers": {
"dynamic-db": {
"command": "uvx",
"args": ["dynamic-db-mcp-server"]
}
}
}
或从源码运行:
{
"mcpServers": {
"dynamic-db": {
"command": "python",
"args": ["-m", "dynamic_db_mcp_server"]
}
}
}
使用流程
1. register_instance(name="my-db", host="10.0.0.5", port=3306, user="root", password="***")
→ {"instance_id": "my-db", "status": "connected"}
→ 连接已测试并缓存
2. list_instances()
→ [{"instance_id": "my-db", "host": "10.0.0.5", "port": 3306, "user": "root", "status": "connected"}]
3. execute_sql(instance_id="my-db", sql="SELECT 1")
→ {"columns": ["1"], "rows": [[1]], "row_count": 1}
4. execute_sql(instance_id="my-db", sql="DROP TABLE temp_test")
→ {"error": "Destructive operation requires confirmation", "sql_type": "DESTRUCTIVE", "statement": "DROP"}
5. execute_sql(instance_id="my-db", sql="DROP TABLE temp_test", confirm_destructive=true)
→ {"affected_rows": 0}
工具列表
| 工具 | 说明 |
|---|---|
register_instance |
注册数据库连接 (用 SELECT 1 测试, 缓存) |
list_instances |
列出所有已注册实例 (不返回密码) |
execute_sql |
执行 SQL. 只读直接通过, 破坏性需 confirm_destructive=true |
list_databases |
列出实例上的所有数据库 |
list_tables |
列出指定库的表 (含行数和大小) |
get_table_detail |
查看表结构 (列信息 + SHOW CREATE TABLE DDL) |
SQL 安全策略
| 类别 | 关键字 | 行为 |
|---|---|---|
| 只读 | SELECT, SHOW, WITH, EXPLAIN, DESC, DESCRIBE | 直接执行 |
| 破坏性 | DROP, TRUNCATE, DELETE, UPDATE, INSERT, ALTER, RENAME, GRANT, REVOKE, CREATE | 需 confirm_destructive=true |
| 危险 | OUTFILE, DUMPFILE, LOAD_FILE, SHUTDOWN, KILL | 一律拒绝 |
架构
AI Agent
│
│ MCP 协议 (stdio)
▼
┌──────────────────────────────────────┐
│ dynamic-db-mcp-server │
│ │
│ FastMCP Server ──→ 6 个工具 │
│ │ │
│ ConnectionManager │
│ - register / get / list │
│ - ping + 自动重连 │
│ - per-instance threading.Lock │
│ │ │
│ SqlValidator │
│ - 关键字分类 │
│ - 只读 / 破坏性 / 危险 │
│ │ │
│ DbExecutor (pymysql) │
│ - execute / list / schema │
└──────────────────────────────────────┘
│
│ TCP 3306
▼
MySQL / MariaDB / TDSQL / TDSQL-C
License
MIT
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