const mysql = require('mysql2/promise');
(async () => {
  // 🔴 口令不再内置明文（2026-09-23 入库口令处置 P2）。运行前请注入 DB_PASSWORD：
  //   DB_PASSWORD='<本机 DB 口令>' node add_word_cols.js
  const c = await mysql.createConnection({
    host: process.env.DB_HOST || 'localhost',
    user: process.env.DB_USER || 'root',
    password: process.env.DB_PASSWORD,
    database: process.env.DB_NAME || 'competition_db',
  });
  try {
    await c.query("ALTER TABLE exam_submissions ADD COLUMN word_file_path VARCHAR(500) NULL DEFAULT NULL COMMENT 'Word答案文件路径' AFTER answers");
    console.log('Added word_file_path');
  } catch (e) {
    if (e.code === 'ER_DUP_FIELDNAME') console.log('word_file_path exists');
    else throw e;
  }
  try {
    await c.query("ALTER TABLE exam_submissions ADD COLUMN word_file_name VARCHAR(255) NULL DEFAULT NULL COMMENT 'Word答案文件名' AFTER word_file_path");
    console.log('Added word_file_name');
  } catch (e) {
    if (e.code === 'ER_DUP_FIELDNAME') console.log('word_file_name exists');
    else throw e;
  }
  const [cols] = await c.query('SHOW COLUMNS FROM exam_submissions');
  cols.forEach(x => console.log(x.Field, x.Type, x.Null));
  await c.end();
})();