first commit

db/sql.js

@@ -0,0 +1,39 @@
+// backend/db/sql.js
+const sql = require('mssql');
+
+const config = {
+  server: process.env.SQL_HOST,
+  port: parseInt(process.env.SQL_PORT),
+  user: process.env.SQL_USER,
+  password: process.env.SQL_PASSWORD,
+  database: process.env.SQL_DATABASE,
+  options: {
+    encrypt: true,
+    trustServerCertificate: true,
+  },
+};
+
+let pool = null;
+
+async function getConnection() {
+  if (pool) return pool;
+  pool = await sql.connect(config);
+  console.log('✅ Connected to SAP SQL Server');
+  return pool;
+}
+
+async function query(sqlQuery, params = []) {
+  const conn = await getConnection();
+  const request = conn.request();
+  // Assuming params is an array of values, but mssql uses named params or input()
+  // For simplicity, if params are positional, need to adjust
+  // But in current code, params are passed as array, so perhaps use input with placeholders
+  // For now, assume sqlQuery has ? and params array
+  params.forEach((param, index) => {
+    request.input(`param${index}`, param);
+  });
+  const result = await request.query(sqlQuery.replace(/\?/g, (match, offset) => `@param${offset}`));
+  return result.recordset;
+}
+
+module.exports = { getConnection, query };