SmartDB

SmartDB is a universal database gateway that implements the Model Context Protocol (MCP) server interface. This gateway allows MCP-compatible clients to connect and explore different databases.

Compared to similar products, SmartDB not only provides basic database connection and exploration capabilities but also adds advanced features such as OAuth 2.0 authentication , health checks, SQL optimization, and index health detection, making database management and maintenance more secure and intelligent.

Currently Supported Databases

Database	Support	Description
MySQL	√	Supports MySQL 5.6+, MariaDB 10+
PostgreSQL	√	Supports PostgreSQL 9.6+, YMatrix
Oracle	√	Oracle 12+
SQL Server	√	Microsoft SQL Server 2012+
Dameng	√	Dameng 8.0+

Tool List

Tool Name	Description
execute_sql	SQL execution tool that can execute ["SELECT", "SHOW", "DESCRIBE", "EXPLAIN", "INSERT", "UPDATE", "DELETE", "CREATE", "ALTER", "DROP", "TRUNCATE"] commands based on permission configuration
get_db_health	Analyzes database health status (connection status, transaction status, running status, lock detection) and outputs professional diagnostic reports and solutions
get_table_desc	Searches for table structures in the database based on table names, supports multi-table queries
get_table_index	Searches for table indexes in the database based on table names, supports multi-table queries
get_table_name	Database table name query tool. Used to query all table names in the database or search for corresponding table names based on Chinese table names or table descriptions
get_db_version	Database version query tool
sql_creator	SQL query generation tool that generates corresponding SQL query statements based on different database types
sql_optimize	A professional SQL performance optimization tool that provides expert optimization suggestions based on execution plans, table structure information, table data volume, and table indexes.

Usage

Environment Configuration File Description

bash

# Database configuration file path
DATABASE_CONFIG_FILE=/Volumes/SmartDB/src/config/database_config.json

#========OAuth2========
# OAuth2 client ID
CLIENT_ID=smart_db_client_id
# OAuth2 client secret
CLIENT_SECRET=smart_db_client_secret
# Access token expiration time (minutes)
ACCESS_TOKEN_EXPIRE_MINUTES=30
# Refresh token expiration time (days)
REFRESH_TOKEN_EXPIRE_DAYS=30
# Token encryption key
TOKEN_SECRET_KEY=smart_db_token_secret
# Username
OAUTH_USER_NAME=admin
# Password
OAUTH_USER_PASSWORD=wenb1n

Note: If you adjust the client ID and key in the oauth configuration, please also modify the corresponding configuration in the static/config file in the previous code

Database Connection Configuration Description

config.json

{
  "default": {
    "host": "192.168.xxx.xxx",
    "port": 3306,
    "user": "root",
    "password": "root",
    "database": "a_llm",
    "role": "readonly",
    "pool_size": 10,
    "max_overflow": 20,
    "pool_recycle": 3600,
    "pool_timeout": 30,
    "type": "mysql"
  },
  "postgresql": {
    "host": "192.168.xxx.xxx",
    "port": 5432,
    "user": "postgres",
    "password": "123456",
    "database": "postgres",
    "schema": "public",
    "role": "readonly",
    "pool_size": 5,
    "max_overflow": 10,
    "pool_recycle": 3600,
    "pool_timeout": 30,
    "type": "postgresql"
  },
  "oracle": {
    "host": "192.168.xxx.xxx",
    "port": 1521,
    "user": "U_ORACLE",
    "password": "123456",
    "database": "123456",
    "service_name": "ORCL",
    "role": "readonly",
    "pool_size": 5,
    "max_overflow": 10,
    "pool_recycle": 3600,
    "pool_timeout": 30,
    "type": "oracle"
  },
  "mssql": {
    "host": "192.168.xxx.xxx",
    "port": 1433,
    "user": "test",
    "password": "123456",
    "database": "TEST",
    "schema": "dbo",
    "role": "readonly",
    "pool_size": 5,
    "max_overflow": 10,
    "pool_recycle": 3600,
    "pool_timeout": 30,
    "type": "mssqlserver"
  }
}

Database Connection Parameter Description

The following table details the meaning and usage of each parameter in the database connection configuration file:

Parameter	Required	Type	Description
host	Yes	string	Database server address
port	Yes	integer	Database server port number
user	Yes	string	Database username
password	Yes	string	Database user password
database	Yes	string	Database name to connect to
role	Yes	string	User role, such as "readonly" for read-only permissions
pool_size	Yes	integer	Connection pool size
max_overflow	Yes	integer	Maximum overflow connections in connection pool
pool_recycle	Yes	integer	Connection pool recycle time (seconds)
pool_timeout	Yes	integer	Connection pool timeout time (seconds)
type	Yes	string	Database type, such as "mysql", "postgresql", "oracle", "mssqlserver"

Additional Parameters for Specific Databases

Parameter	Database Type	Required	Type	Description
schema	PostgreSQL, SQL Server	No	string	Database schema
service_name	Oracle	No	string	Oracle service name

role permission control configuration items and corresponding database permissions: readonly (readonly), read/write (writer), administrator (admin)

Code

    "readonly": ["SELECT", "SHOW", "DESCRIBE", "EXPLAIN"],  # readonly permission
    "writer": ["SELECT", "SHOW", "DESCRIBE", "EXPLAIN", "INSERT", "UPDATE", "DELETE"],  # read/write permission
    "admin": ["SELECT", "SHOW", "DESCRIBE", "EXPLAIN", "INSERT", "UPDATE", "DELETE", 
             "CREATE", "ALTER", "DROP", "TRUNCATE"]  # administrator permission

Note

"default" is the default database connection configuration and must be configured. Other database configurations should be added as needed.

pip installation and configuration

Terminal

pip install SmartDB-MCP

Parameter explanation
--mode: transmission mode ("stdio", "sse", "streamablehttp")
--envfile path of the environment variable file
--oauth enable oauth authentication (currently only supported in "streamablehttp" mode)

Start command:
 smartdb --envfile=/Volumes/config/.env --oauth=true

Docker Startup

Quick Start

1. Build and Start Service

bash

# Start service using docker-compose
docker-compose up -d

# Check service status
docker-compose ps

# View logs
docker-compose logs -f smartdb

2. Manual Image Building

bash

# Build image
docker build -t smartdb-mcp:latest .

# Run container
docker run -d \
  --name smartdb-mcp-server \
  -p 3000:3000 \
  -e DATABASE_CONFIG_FILE=/app/src/config/database_config.json \
  -e CLIENT_ID=smart_db_client_id \
  -e CLIENT_SECRET=smart_db_client_secret \
  -e TOKEN_SECRET_KEY=your_secret_key \
  -v $(pwd)/src/config:/app/src/config:ro \
  -v $(pwd)/logs:/app/logs \
  smartdb-mcp:latest

Code Startup

Local Development Streamable Http Mode

Start service using uv

Add the following content to your MCP client tools, such as cursor, cline, etc.

MCP JSON as follows:

config.json

{
  "mcpServers": {
    "smartdb": {
      "name": "smartdb",
      "type": "streamableHttp",
      "description": "",
      "isActive": true,
      "url": "http://localhost:3000/mcp/"
    }
  }
}

Start command:

bash

# Download dependencies
uv sync

# Start
uv run -m core.server

# Custom env file location
uv run -m core.server --envfile /path/to/.env

Local Development SSE Mode

Start service using uv

Add the following content to your MCP client tools, such as cursor, cline, etc.

MCP JSON as follows:

config.json

{
  "mcpServers": {
    "smartdb": {
      "name": "smartdb",
      "description": "",
      "isActive": true,
      "url": "http://localhost:3000/sse"
    }
  }
}

Start command:

bash

# Download dependencies
uv sync

# Start
uv run -m core.server --mode sse

# Custom env file location
uv run -m core.server --mode sse --envfile /path/to/.env

Local Development STDIO Mode

Add the following content to your MCP client tools, such as cursor, cline, etc.

MCP JSON as follows:

config.json

{
  "mcpServers": {
      "smartdb": {
          "name": "smartdb",
          "type": "stdio",
          "isActive": false,
          "registryUrl": "",
          "command": "uv",
          "args": [
            "--directory",
            "/Volumes/python/SmartDB/",
            "run",
            "-m",
            "core.server",
            "--mode",
            "stdio"
          ],
          "env": {
            "DATABASE_CONFIG_FILE": "/Volumes/database_config.json"
          }
      }
    }
  }
}

OAuth 2.0 Authentication Support

Start authentication service. By default, it uses the built-in OAuth 2.0 password mode authentication. You can modify your own authentication service address in the env file.

bash

uv run -m core.server --oauth=true

Access the authentication service at http://localhost:3000/login. Default account and password are configured in the env file.
Copy the token and add it to the request header, for example:

config.json

{
  "mcpServers": {
    "smartdb": {
      "name": "smartdb",
      "type": "streamableHttp",
      "description": "",
      "isActive": true,
      "url": "http://localhost:3000/mcp/",
      "headers": {
        "authorization": "bearer TOKEN_VALUE"
      }
    }
  }
}

Usage Examples

Query the table data of the default connection pool
Query the table data of the others connection pool
Query data from tables in other connection pools and other databases
Query database health status
Sql Optimize