Database MCP Server
Enables SQL queries, schema exploration, and Oracle sequence management across multiple databases including Oracle, OceanBase, and DolphinDB. Supports multiple environments with secure password handling.
README
Database MCP Server
多数据库 MCP 服务器,支持 Oracle、OceanBase(Oracle 模式 + MySQL 模式)和 DolphinDB。
通过 MCP 协议(stdio 传输)与 Claude Desktop 等客户端通信,提供 SQL 查询、元数据查看和 Sequence 管理能力。
环境要求
- Python >= 3.10(项目自带 venv,通过
uv管理) - 目标数据库可达(本机或网络)
快速开始
1. 安装依赖
项目使用 uv 管理 Python 环境和依赖:
# 安装 uv(如果没有)
pip install uv
# 创建虚拟环境并安装依赖(已安装则跳过)
uv venv --python 3.11
uv pip install -r requirements.txt
# 如果用 DolphinDB,额外安装
uv pip install dolphindb
2. 配置数据库连接
复制配置示例文件并修改:
cp db_config.example.json db_config.json
配置文件按环境(dev / uat / pro)组织,每个环境可以配置多个数据库连接:
{
"dev": {
"oracle_dev": {
"type": "oracle",
"host": "192.168.1.10",
"port": 1521,
"service_name": "DEVPDB",
"user": "dev_user",
"password": "dev_pass"
},
"ob_mysql": {
"type": "oceanbase_mysql",
"host": "192.168.1.11",
"port": 2883,
"database": "test",
"user": "root@obmysql",
"password": ""
}
},
"uat": {
"oracle_dev": {
"type": "oracle",
"host": "192.168.2.10",
"port": 1521,
"service_name": "UATPDB",
"user": "uat_user",
"password": "${UAT_ORACLE_PWD}"
}
}
}
连接类型说明:
| type | 说明 | 必需参数 |
|---|---|---|
oracle |
Oracle 或 OceanBase Oracle 模式 | host, port, service_name, user, password |
oceanbase_mysql |
OceanBase MySQL 模式 | host, port, user, password, database |
dolphindb |
DolphinDB | host, port, user, password |
密码支持通过
${VAR_NAME}从环境变量读取,避免明文存储。
3. 选择运行环境
通过 DB_ENV 环境变量切换(默认 dev):
# Windows CMD
set DB_ENV=uat
# PowerShell
$env:DB_ENV="uat"
# Bash
export DB_ENV=pro
启动服务器
# 方式一
uv run python main.py
# 方式二
uv run python -m server
服务器启动后会通过 stdio 等待 MCP 客户端连接,没有网络端口暴露。
注册到 Claude Desktop
在 Claude Desktop 配置文件(claude_desktop_config.json)中添加:
{
"mcpServers": {
"db": {
"command": "uv",
"args": [
"run",
"--directory",
"E:/python/workspace/mcp-server-databases",
"python",
"-m",
"server"
],
"env": {
"DB_ENV": "dev",
"DB_CONFIG_PATH": "E:/python/workspace/mcp-server-databases/db_config.json"
}
}
}
}
如需同时连接多个环境,注册多个 server:
{
"mcpServers": {
"db-dev": {
"command": "uv",
"args": ["run", "--directory", "E:/...", "python", "-m", "server"],
"env": { "DB_ENV": "dev" }
},
"db-pro": {
"command": "uv",
"args": ["run", "--directory", "E:/...", "python", "-m", "server"],
"env": { "DB_ENV": "pro" }
}
}
}
注册到 OpenCode
在项目根目录创建 opencode.json(或编辑全局配置 ~/.config/opencode/opencode.jsonc),添加 MCP 服务器配置:
{
"mcp": {
"db": {
"type": "local",
"command": [
"uv",
"run",
"--directory",
"E:/python/workspace/mcp-server-databases",
"python",
"-m",
"server"
],
"enabled": true,
"environment": {
"DB_ENV": "dev",
"DB_CONFIG_PATH": "E:/python/workspace/mcp-server-databases/db_config.json"
}
}
}
}
如需同时连接多个环境,添加多个 server:
{
"mcp": {
"db-dev": {
"type": "local",
"command": ["uv", "run", "--directory", "E:/...", "python", "-m", "server"],
"enabled": true,
"environment": { "DB_ENV": "dev" }
},
"db-pro": {
"type": "local",
"command": ["uv", "run", "--directory", "E:/...", "python", "-m", "server"],
"enabled": false,
"environment": { "DB_ENV": "pro" }
}
}
}
"enabled": false的 server 不会随 OpenCode 启动,需要时手动启用。
OpenCode 与 Claude Desktop 格式对比
| 项目 | OpenCode | Claude Desktop |
|---|---|---|
| 配置文件名 | opencode.json / opencode.jsonc |
claude_desktop_config.json |
| 顶层键 | "mcp" |
"mcpServers" |
| 类型字段 | "type": "local" |
无(默认 stdio) |
| 命令格式 | "command": [列表] |
"command" + "args" 分开 |
| 环境变量 | "environment" |
"env" |
| 启用开关 | "enabled" |
无 |
工具说明
所有工具都接受 connection 参数指定用哪个数据库连接,省略则使用第一个配置的连接。
| 工具 | 参数 | 说明 |
|---|---|---|
query |
connection, sql |
执行 SELECT 查询,返回 Markdown 表格 |
execute |
connection, sql |
执行 INSERT/UPDATE/DELETE/DDL |
list_schemas |
connection |
列出所有 Schema / 数据库 |
list_tables |
connection, schema |
列出指定 Schema 下的表 |
describe_table |
connection, table_name, schema |
查看表结构(列名、类型、可空、主键) |
list_sequences |
connection, schema |
列出所有 Sequence(仅 Oracle) |
get_sequence_value |
connection, sequence_name, schema |
获取 Sequence 当前值 |
alter_sequence |
connection, sequence_name, schema, increment_by, min_value, max_value, cycle, cache, order_flag |
修改 Sequence 属性 |
set_sequence_value |
connection, sequence_name, value, schema |
将 Sequence 设为指定值 |
安全
execute工具:可通过环境变量DENY_EXECUTE=true禁用写操作- 数据库侧权限:连接配置使用什么数据库账号就有什么权限,建议生产环境使用只读账号
- 密码保护:使用
${VAR_NAME}引用环境变量,密码不写入配置文件 - 无网络端口:纯 stdio 通信,不暴露网络服务
配置参考
所有环境变量
| 变量 | 默认值 | 说明 |
|---|---|---|
DB_CONFIG_PATH |
./db_config.json |
配置文件路径 |
DB_ENV |
dev |
运行环境(dev/uat/pro) |
DENY_EXECUTE |
false |
设为 true 禁用写入操作 |
项目依赖
| 包 | 版本要求 | 用途 |
|---|---|---|
| mcp | >=1.0.0 | MCP Python SDK |
| oracledb | >=2.0.0 | Oracle / OceanBase Oracle 驱动 |
| pymysql | >=1.0.0 | OceanBase MySQL 驱动 |
| dolphindb | >=1.0.0(可选) | DolphinDB 驱动 |
| cryptography | >=42.0.0 | oracledb 加密依赖 |
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