OpenLink MCP Server for ADO.NET

A lightweight C#-based MCP (Model Context Protocol) server for ADO.NET . This server is compatible with Virtuoso. Currently, this server has only been successfully tested using the .NET runtimes on Windows and Linux.

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: When connected to Virtuoso, execute stored procedures and retrieve results.
• Execute Queries:
  • JSONL result format: Optimized for structured responses.
  • Markdown table format: Ideal for reporting and visualization.

Environment Variables

Update your .env by overriding these defaults to match your preferences.

ADO_URL="HOST=localhost:1111;Database=Demo;UID=demo;PWD=demo"
API_KEY=xxx

Prerequisites

1. NET.8
   • Check that the project file (MCP_AdoNet_Server.csproj) is compatible with your environment by running:
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     dotnet run --framework net8.0 --project /path/to/mcp-adonet-server/MCP_AdoNet_Server.csproj

2. NET.9
   • Check that the project file (MCP_AdoNet_Server.csproj) is compatible with your environment by running:
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     dotnet run --framework net9.0 --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:
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     dotnet clean /path/to/mcp-adonet-server/MCP_AdoNet_Server.csproj
     dotnet build /path/to/mcp-adonet-server/MCP_AdoNet_Server.csproj

Installation

Clone this repository:

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

Configuration

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

1. NET.8

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   {
     "mcpServers": {
       "my_database": {
         "command": "dotnet",
         "args": ["run", "--framework", "net8.0", "--project", "/path/to/mcp-adonet-server/MCP_AdoNet_Server.csproj"],
         "env": {
           "ADO_URL": "HOST=localhost:1111;Database=Demo;UID=demo;PWD=demo",
           "API_KEY": "sk-xxx"
         }
       }
     }
   }

2. NET.9

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   {
     "mcpServers": {
       "my_database": {
         "command": "dotnet",
         "args": ["run", "--framework", "net9.0", "--project", "/path/to/mcp-adonet-server/MCP_AdoNet_Server.csproj"],
         "env": {
           "ADO_URL": "HOST=localhost:1111;Database=Demo;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:

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   npm install -g @modelcontextprotocol/inspector

2. Start the inspector, depending on which .Net version is in use:

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   dotnet clean /path/to/mcp-adonet-server/MCP_AdoNet_Server.csproj
   
   npx @modelcontextprotocol/inspector dotnet run --framework net8.0 --project /path/to/mcp-adonet-server/MCP_AdoNet_Server.csproj -e ADO_URL="HOST=localhost:1111;Database=Demo;UID=username;PWD=password" -e API_KEY="sk-xxx-myapikey-xxx"

   -- or --

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   dotnet clean /path/to/mcp-adonet-server/MCP_AdoNet_Server.csproj
   
   npx @modelcontextprotocol/inspector dotnet run --framework net9.0 --project /path/to/mcp-adonet-server/MCP_AdoNet_Server.csproj -e ADO_URL="HOST=localhost:1111;Database=Demo;UID=username;PWD=password" -e API_KEY="sk-xxx-myapikey-xxx"

Access the provided URL to troubleshoot server interactions.