SQL Server MCP Service

import { CallToolResult } from '@modelcontextprotocol/sdk/types.js' import type { DatabaseConnection } from '../database' export async function getFunctionSchema( db: DatabaseConnection, functionName: string, schemaName: string = 'dbo' ): Promise<CallToolResult> { try { const pool = db.getPool() const query = ` SELECT p.PARAMETER_NAME, p.DATA_TYPE, p.PARAMETER_MODE, p.CHARACTER_MAXIMUM_LENGTH, p.NUMERIC_PRECISION, p.NUMERIC_SCALE, p.ORDINAL_POSITION, r.ROUTINE_DEFINITION, r.DATA_TYPE as RETURN_TYPE, CASE WHEN r.DATA_TYPE = 'TABLE' THEN 'TABLE-VALUED' ELSE 'SCALAR' END AS FUNCTION_TYPE FROM INFORMATION_SCHEMA.PARAMETERS p INNER JOIN INFORMATION_SCHEMA.ROUTINES r ON p.SPECIFIC_NAME = r.SPECIFIC_NAME WHERE r.ROUTINE_NAME = @functionName AND r.ROUTINE_SCHEMA = @schemaName AND r.ROUTINE_TYPE = 'FUNCTION' ORDER BY p.ORDINAL_POSITION `.trim() const request = pool.request() request.input('functionName', functionName) request.input('schemaName', schemaName) const result = await request.query(query) return { content: [ { type: 'text', text: JSON.stringify( { function: `${schemaName}.${functionName}`, functionType: result.recordset[0]?.FUNCTION_TYPE || 'UNKNOWN', returnType: result.recordset[0]?.RETURN_TYPE || 'UNKNOWN', parameters: result.recordset.map((row) => ({ name: row.PARAMETER_NAME, dataType: row.DATA_TYPE, mode: row.PARAMETER_MODE, maxLength: row.CHARACTER_MAXIMUM_LENGTH, precision: row.NUMERIC_PRECISION, scale: row.NUMERIC_SCALE, position: row.ORDINAL_POSITION, })), definition: result.recordset[0]?.ROUTINE_DEFINITION || null, }, null, 2 ), }, ], } } catch (error) { return { content: [ { type: 'text', text: `Erro: ${error instanceof Error ? error.message : 'Erro desconhecido'}`, }, ], isError: true, } } }