C# based Model Context Procotol (MCP) Server for ADO.NET

A lightweight MCP (Model Context Protocol) server for ADO.NET . This server is compatible with Virtuoso DBMS and other DBMS backends that has ODBC driver.

Features

• Get Schemas: Fetch and list all schema names from the connected database.
• Get Tables: Retrieve table information for specific schemas or all schemas.
• Describe Table: Generate a detailed description of table structures, including:
  • Column names and data types
  • Nullable attributes
  • Primary and foreign keys
• Search Tables: Filter and retrieve tables based on name substrings.
• Execute Stored Procedures: In the case of Virtuoso, execute stored procedures and retrieve results.
• Execute Queries:
  • JSONL result format: Optimized for structured responses.
  • Markdown table format: Ideal for reporting and visualization.

Prerequisites

1. NET.8 or above

• Check that the project file (MCP_AdoNet_Server.csproj) is compatible with your environment by running:

  dotnet run --project /path/to/mcp-adonet-server/MCP_AdoNet_Server.csproj
  

• If need be, you can also attempt to rebuild MCP_AdoNet_Server.csproj by running:

  dotnet clean /path/to/mcp-adonet-server/MCP_AdoNet_Server.csproj
  dotnet build /path/to/mcp-adonet-server/MCP_AdoNet_Server.csproj
  

3. unixODBC Runtime Environment Checks:

• Check installation configuration (i.e., location of key INI files) by running:

  odbcinst -j
  

• List available data source names by running:

  odbcinst -q -s
  

3. ODBC DSN Setup: Configure your ODBC Data Source Name (~/.odbc.ini) for the target database. Example for Virtuoso DBMS:

   [VOS]
   Description = OpenLink Virtuoso
   Driver = /path/to/virtodbcu_r.so
   Database = Demo
   Address = localhost:1111
   WideAsUTF16 = Yes
   

Installation

Clone this repository:

git clone https://github.com/OpenLinkSoftware/mcp-adonet-server.git  
cd mcp-adonet-server

Environment Variables

Update your .envby overriding the defaults to match your preferences

ADO_URL=DSN=VOS;UID=demo;PWD=demo
API_KEY=xxx

Configuration

For Claude Desktop users: Add the following to claude_desktop_config.json:

{
  "mcpServers": {
    "my_database": {
      "command": "dotnet",
      "args": ["run", "--project", "/path/to/mcp-adonet-server/MCP_AdoNet_Server.csproj"],
      "env": {
        "ADO_URL": "DSN=VOS;UID=demo;PWD=demo",
        "API_KEY": "sk-xxx"
      }
    }
  }
}

Usage

Tools Provided

After successful installation, the following tools will be available to MCP client applications.

Overview

Detailed Description

• ado_get_schemas

  • Retrieve and return a list of all schema names from the connected database.
  • Input parameters:
    • url (string, optional): ADO.NET URL connection string.
  • Returns a JSON string array of schema names.

• ado_get_tables

  • Retrieve and return a list containing information about tables in a specified schema. If no schema is provided, uses the connection's default schema.
  • Input parameters:
    • schema (string, optional): Database schema to filter tables. Defaults to connection default.
    • url (string, optional): ADO.NET URL connection string.
  • Returns a JSON string containing table information (e.g., TABLE_CAT, TABLE_SCHEM, TABLE_NAME, TABLE_TYPE).

• ado_filter_table_names

  • Filters and returns information about tables whose names contain a specific substring.
  • Input parameters:
    • q (string, required): The substring to search for within table names.
    • schema (string, optional): Database schema to filter tables. Defaults to connection default.
    • url (string, optional): ADO.NET URL connection string.
  • Returns a JSON string containing information for matching tables.

• ado_describe_table

  • Retrieve and return detailed information about the columns of a specific table.
  • Input parameters:
    • schema (string, required): The database schema name containing the table.
    • table (string, required): The name of the table to describe.
    • url (string, optional): ADO.NET URL connection string.
  • Returns a JSON string describing the table's columns (e.g., COLUMN_NAME, TYPE_NAME, COLUMN_SIZE, IS_NULLABLE).

• ado_query_database

  • Execute a standard SQL query and return the results in JSON format.
  • Input parameters:
    • query (string, required): The SQL query string to execute.
    • url (string, optional): ADO.NET URL connection string.
  • Returns query results as a JSON string.

• ado_query_database_md

  • Execute a standard SQL query and return the results formatted as a Markdown table.
  • Input parameters:
    • query (string, required): The SQL query string to execute.
    • url (string, optional): ADO.NET URL connection string.
  • Returns query results as a Markdown table string.

• ado_query_database_jsonl

  • Execute a standard SQL query and return the results in JSON Lines (JSONL) format (one JSON object per line).
  • Input parameters:
    • query (string, required): The SQL query string to execute.
    • url (string, optional): ADO.NET URL connection string.
  • Returns query results as a JSONL string.

• ado_spasql_query

  • Execute a SPASQL (SQL/SPARQL hybrid) query return results. This is a Virtuoso-specific feature.
  • Input parameters:
    • query (string, required): The SPASQL query string.
    • max_rows (number, optional): Maximum number of rows to return. Defaults to 20.
    • timeout (number, optional): Query timeout in milliseconds. Defaults to 30000.
    • url (string, optional): ADO.NET URL connection string.
  • Returns the result from the underlying stored procedure call (e.g., Demo.demo.execute_spasql_query).

• ado_sparql_query

  • Execute a SPARQL query and return results. This is a Virtuoso-specific feature.
  • Input parameters:
    • query (string, required): The SPARQL query string.
    • format (string, optional): Desired result format. Defaults to 'json'.
    • timeout (number, optional): Query timeout in milliseconds. Defaults to 30000.
    • url (string, optional): ADO.NET URL connection string.
  • Returns the result from the underlying function call (e.g., "UB".dba."sparqlQuery").

• ado_virtuoso_support_ai

  • Utilizes a Virtuoso-specific AI Assistant function, passing a prompt and optional API key. This is a Virtuoso-specific feature.
  • Input parameters:
    • prompt (string, required): The prompt text for the AI function.
    • api_key (string, optional): API key for the AI service. Defaults to "none".
    • url (string, optional): ADO.NET URL connection string.
  • Returns the result from the AI Support Assistant function call (e.g., DEMO.DBA.OAI_VIRTUOSO_SUPPORT_AI).

Troubleshooting

For easy troubleshooting:

1. Install the MCP Inspector:

   npm install -g @modelcontextprotocol/inspector
   

2. Start the inspector:

   • for Windows, Linux

   npx @modelcontextprotocol/inspector dotnet run --project /path/to/mcp-adonet-server/MCP_AdoNet_Server.csproj -e ADO_URL="DSN=MyDSN;UID=username;PWD=password" -e API_KEY="sk-xxx-myapikey-xxx"
   
   

   • for macOS

   npx @modelcontextprotocol/inspector dotnet run --project /path/to/mcp-adonet-server/MCP_AdoNet_Server.csproj -e DYLD_LIBRARY_PATH=/opt/homebrew/lib -e ADO_URL="DSN=MyDSN;UID=username;PWD=password" -e API_KEY="sk-xxx-myapikey-xxx"
   
   

Access the provided URL to troubleshoot server interactions.