DB MCP Server

DB MCP Server

Enables Claude Code to execute read-only queries and DML operations on Oracle and PostgreSQL databases, and to list or describe database tables.

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DB MCP Server

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一个基于 TypeScript 实现的 Model Context Protocol 服务,让 Claude Code 可以直接查询 OraclePostgreSQLMySQL 数据库。

支持的数据库

  • Oracle(通过 oracledb 驱动,默认 thin 模式)
  • PostgreSQL(通过 pg 驱动)
  • MySQL(通过 mysql2 驱动)

提供的工具

  • list_tables:列出指定 schema / 数据库下的表
  • describe_table:查看表结构、字段类型和约束
  • execute_query:执行只读的 SELECT 查询
  • execute_dml:执行 INSERT/UPDATE/DELETE/DDL 语句

每个工具都支持可选参数 dataSource"oracle""postgres""mysql")。如果只配置了一种数据库,会默认使用该数据库。

环境要求

  • Node.js 20+
  • 至少配置一个数据库的环境变量

安装

本项目强制使用 pnpm 管理依赖。

cd C:\Users\ASUS\db-mcp-server
pnpm install
pnpm run build

如果你用 npm installyarn installpreinstall 脚本会报错并阻止安装。

配置

1. 环境变量 / .env 文件

支持两种配置方式,优先级如下:

  1. 系统环境变量(最高优先级)
  2. 项目根目录下的 .env 文件

示例 .env

# Oracle 配置
ORACLE_USER=your_user
ORACLE_PASSWORD=your_password
ORACLE_DSN=localhost:1521/ORCLPDB1

# PostgreSQL 配置
POSTGRES_HOST=localhost
POSTGRES_PORT=5432
POSTGRES_USER=your_user
POSTGRES_PASSWORD=your_password
POSTGRES_DATABASE=your_db

# MySQL 配置
MYSQL_HOST=localhost
MYSQL_PORT=3306
MYSQL_USER=your_user
MYSQL_PASSWORD=your_password
MYSQL_DATABASE=your_db

也可以在启动 Claude Code 前用 PowerShell 设置:

$env:ORACLE_USER = "your_user"
$env:ORACLE_PASSWORD = "your_password"
$env:ORACLE_DSN = "localhost:1521/ORCLPDB1"

$env:POSTGRES_HOST = "localhost"
$env:POSTGRES_PORT = "5432"
$env:POSTGRES_USER = "your_user"
$env:POSTGRES_PASSWORD = "your_password"
$env:POSTGRES_DATABASE = "your_db"

$env:MYSQL_HOST = "localhost"
$env:MYSQL_PORT = "3306"
$env:MYSQL_USER = "your_user"
$env:MYSQL_PASSWORD = "your_password"
$env:MYSQL_DATABASE = "your_db"

claude

2. 在 Claude Code 中注册 MCP Server

C:\Users\ASUS\.mcp.json 中添加:

{
  "mcpServers": {
    "db-mcp-server": {
      "command": "cmd",
      "args": [
        "/c",
        "cd /d C:\\Users\\ASUS\\db-mcp-server && node dist\\index.js"
      ]
    }
  }
}

C:\Users\ASUS\.claude\settings.local.json 中启用:

{
  "enabledMcpjsonServers": [
    "db-mcp-server"
  ]
}

修改环境变量、.mcp.json 或重新构建后,请重启 Claude Code 使配置生效。

构建与运行

pnpm run build
node dist/index.js

开发调试

无需编译,直接使用 tsx 运行:

pnpm tsx src/index.ts

Oracle Thick 模式

如果数据库需要使用 thick 模式,请设置:

$env:ORACLE_THICK_MODE = "1"
$env:ORACLE_LIB_DIR = "C:\Users\ASUS\Desktop\instantclient_19_28"

验证

重启 Claude Code 后,可以尝试:

  • "列出 Oracle 的表"
  • "列出 PostgreSQL 的表"
  • "列出 MySQL 的表"
  • "描述 postgres 中的 users 表"
  • "描述 mysql 中的 users 表"
  • "在 oracle 上执行 SELECT * FROM employees"
  • "在 mysql 上执行 SELECT * FROM users"

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