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mcp-jdbc-server

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Java based Model Context Procotol (MCP) Server for JDBC

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---
# OpenLink MCP Server for JDBC

A lightweight Java-based MCP (Model Context Protocol) server for JDBC built with **Quakrus**. 
This server is compatible with Virtuoso DBMS and any other DBMS backend that has a JDBC driver.

![mcp-client-and-servers|648x499](https://www.openlinksw.com/data/gifs/mcp-client-and-servers-opal-tools-with-jdbc.gif)

---

## 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**: _A Virtuoso-specific feature!_ Execute stored procedures and retrieve results.
- **Execute Queries**:
  - JSONL result format: Optimized for structured responses.
  - Markdown table format: Ideal for reporting and visualization.

---

## Prerequisites

MCP server requires Java 21 or above.

---

## Installation

Clone this repository:
```bash
git clone https://github.com/OpenLinkSoftware/mcp-jdbc-server.git  
cd mcp-jdbc-server
```

## Environment Variables

Update your `.env` by overriding these defaults to match your preferences:
```
jdbc.url=jdbc:virtuoso://localhost:1111
jdbc.user=dba
jdbc.password=dba
jdbc.api_key=xxx
```

---

## Configuration

For **Claude Desktop** users using Virtuoso and its JDBC driver:

Add the following to `claude_desktop_config.json`:

```json
{
  "mcpServers": {
    "my_database": {
      "command": "java",
      "args": ["-jar", "/path/to/mcp-jdbc-server/MCPServer-1.0.0-runner.jar"],
      "env": {
        "jdbc.url": "jdbc:virtuoso://localhost:1111",
        "jdbc.user": "username",
        "jdbc.password": "password",
        "jdbc.api_key": "sk-xxx"
      }
    }
  }
}
```

For **Claude Desktop** users using another JDBC driver or a combination of drivers:

Add the following, edited to suit your local environment, to `claude_desktop_config.json`:

```json
    "jdbc": {
      "command": "java",
      "args": [
        "-cp",
        "/path/to/mcp-jdbc-server/MCPServer-1.0.0-runner.jar:/path/to/jdbc_driver1.jar:/path/to/jdbc_driverN.jar",
        "io.quarkus.runner.GeneratedMain"
      ],
      "env": {
        "jdbc.url": "jdbc:virtuoso://localhost:1111",
        "jdbc.user": "dba",
        "jdbc.password": "dba"
      }
    }
```

---

## Use

### Tools Provided

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

#### Overview

| name                     | description |
|:---                      |:---|
|`jdbc_get_schemas`        | List database schemas accessible to connected database management system (DBMS). |
|`jdbc_get_tables`         | List tables associated with a selected database schema. |
|`jdbc_describe_table`     | Provide the description of a table associated with a designated database schema. This includes information about column names, data types, nulls handling, autoincrement, primary key, and foreign keys. |
|`jdbc_filter_table_names` | List tables, based on a substring pattern from the `q` input field, associated with a selected database schema. |
|`jdbc_query_database`     | Execute a SQL query and return results in JSONL format. |
|`jdbc_execute_query`      | Execute a SQL query and return results in JSONL format. |
|`jdbc_execute_query_md`   | Execute a SQL query and return results in Markdown table format. |
|`jdbc_spasql_query`       | _A Virtuoso-specific feature!_ Execute a SPASQL query and return results. |
|`jdbc_sparql_query`       | _A Virtuoso-specific feature!_ Execute a SPARQL query and return results. |
|`jdbc_virtuoso_support_ai`| _A Virtuoso-specific feature!_ Interact with LLMs through the Virtuoso Support Assistant/Agent. |

#### Detailed Description

- **`jdbc_get_schemas`**
  - Retrieve and return a list of all schema names from the connected database.
  - Input parameters:
    - `user` (string, optional): Database username. Defaults to `"demo"`.
    - `password` (string, optional): Database password. Defaults to `"demo"`.
    - `url` (string, optional): JDBC URL connection string.
  - Returns a JSON string array of schema names.

- **`jdbc_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.
    - `user` (string, optional): Database username. Defaults to `"demo"`.
    - `password` (string, optional): Database password. Defaults to `"demo"`.
    - `url` (string, optional): JDBC URL connection string.
  - Returns a JSON string containing table information (e.g., `TABLE_CAT`, `TABLE_SCHEM`, `TABLE_NAME`, `TABLE_TYPE`).

- **`jdbc_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.
    - `user` (string, optional): Database username. Defaults to `"demo"`.
    - `password` (string, optional): Database password. Defaults to `"demo"`.
    - `url` (string, optional): JDBC URL connection string.
  - Returns a JSON string containing information for matching tables.

- **`jdbc_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.
    - `user` (string, optional): Database username. Defaults to `"demo"`.
    - `password` (string, optional): Database password. Defaults to `"demo"`.
    - `url` (string, optional): JDBC URL connection string.
  - Returns a JSON string describing the table's columns (e.g., `COLUMN_NAME`, `TYPE_NAME`, `COLUMN_SIZE`, `IS_NULLABLE`).

- **`jdbc_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.
    - `user` (string, optional): Database username. Defaults to `"demo"`.
    - `password` (string, optional): Database password. Defaults to `"demo"`.
    - `url` (string, optional): JDBC URL connection string.
  - Returns query results as a JSON string.

- **`jdbc_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.
    - `user` (string, optional): Database username. Defaults to `"demo"`.
    - `password` (string, optional): Database password. Defaults to `"demo"`.
    - `url` (string, optional): JDBC URL connection string.
  - Returns query results as a Markdown table string.

- **`jdbc_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.
    - `user` (string, optional): Database username. Defaults to `"demo"`.
    - `password` (string, optional): Database password. Defaults to `"demo"`.
    - `url` (string, optional): JDBC URL connection string.
  - Returns query results as a JSONL string.

- **`jdbc_spasql_query`**
  - _A Virtuoso-specific feature!_
  - Execute a SPASQL (SQL/SPARQL hybrid) query return results.
  - 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` (i.e., 30 seconds).
    - `user` (string, optional): Database username. Defaults to `"demo"`.
    - `password` (string, optional): Database password. Defaults to `"demo"`.
    - `url` (string, optional): JDBC URL connection string.
  - Returns the result from the underlying stored procedure call (e.g., `Demo.demo.execute_spasql_query`).

- **`jdbc_sparql_query`**
  - _A Virtuoso-specific feature!_
  - Execute a SPARQL query and return results.
  - 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` (i.e., 30 seconds).
    - `user` (string, optional): Database username. Defaults to `"demo"`.
    - `password` (string, optional): Database password. Defaults to `"demo"`.
    - `url` (string, optional): JDBC URL connection string.
  - Returns the result from the underlying function call (e.g., `"UB".dba."sparqlQuery"`).

- **`jdbc_virtuoso_support_ai`**
  - _A Virtuoso-specific feature!_
  - Utilizes a Virtuoso-specific AI Assistant function, passing a prompt and optional API key.
  - 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"`.
    - `user` (string, optional): Database username. Defaults to `"demo"`.
    - `password` (string, optional): Database password. Defaults to `"demo"`.
    - `url` (string, optional): JDBC URL connection string.
  - Returns the result from the AI Support Assistant function call (e.g., `DEMO.DBA.OAI_VIRTUOSO_SUPPORT_AI`).

---

### Basic Use & Troubleshooting

#### MCP Inspector Connecting to Virtuoso's ODBC Driver

For basic MCP client use and troubleshooting, use the MCP Inspector as follows:

1. Install the MCP Inspector:

```bash
   npm install -g @modelcontextprotocol/inspector
   ```

2. Start the inspector:

```bash
   npx @modelcontextprotocol/inspector java -jar /path/to/mcp-jdbc-server/MCPServer-1.0.0-runner.jar
   ```

Access the URL returned by the inspector to troubleshoot MCP server interactions.

#### MCP Inspector Connecting to additional Drivers

For basic MCP client use and troubleshooting, use the MCP Inspector as follows:

1. Install the JDBC Driver(s), ensuring their JAR files are registered with the host operating system's Java Virtual Machine (JVM) via `$CLASSPATH`. For instance:

```bash
    export CLASSPATH=$CLASSPATH:/path/to/driver1.jar:/path/to/driver2.jar:/path/to/driverN.jar
    ```

2. Start the inspector using the following command-line arguments:

```bash
   npx @modelcontextprotocol/inspector java -cp MCPServer-1.0.0-runner.jar:/path/to/driver1.jar:/path/to/driver2.jar:/path/to/driverN.jar io.quarkus.runner.GeneratedMain
   ```

#### Use Example based on Oracle and Informix Drivers

0. Assuming the following JDBC Driver information:

- **Oracle JDBC Driver URL Template**

```bash
     jdbc:oracle:thin:@<hostname>:[port]:<SERVICEID>
     ```

- **Informix JDBC Driver URL Template**

```bash
     jdbc:informix-sqli://<hostname>:<port>/<database></database>:<INFORMIXSERVER>=<SERVICEID>
     ```

1. Install the Oracle (`ojdbc17.jar`) and/or Informix (`jdbc-15.0.0.1.1.jar`) JDBC Drivers, and ensure their JAR files are registered with the host operating system's Java Virtual Machine (JVM) via `$CLASSPATH`. For instance:

```bash
    export CLASSPATH=$CLASSPATH:/path/to/Java/Extensions/jdbc-15.0.0.1.1.jar
    export CLASSPATH=$CLASSPATH:/path/to/Java/Extensions/ojdbc17.jar
   ```

2. Start the inspector using the following command-line arguments:

```bash
   npx @modelcontextprotocol/inspector java -cp MCPServer-1.0.0-runner.jar:/path/to/Java/Extensions/ojdbc17.jar:/path/to/Java/Extensions/jdbc-15.0.0.1.1.jar io.quarkus.runner.GeneratedMain
   ```

3. Access the URL returned by the inspector and then use the `jdbc_execute_query` operation to query the target database, by providing actual values for the following input field templates:

- JDBC URL 
   - User
   - Password
   - Query

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