const mysql = require('mysql2/promise');
(async () => {
  const c = await mysql.createConnection({
    host: 'localhost', user: 'root', password: '74191221', database: 'competition_db'
  });
  try {
    await c.query("ALTER TABLE news ADD COLUMN wx_link VARCHAR(500) NULL DEFAULT NULL COMMENT '微信公众号文章链接' AFTER content");
    console.log('Added wx_link column');
  } catch (e) {
    if (e.code === 'ER_DUP_FIELDNAME') console.log('wx_link already exists');
    else throw e;
  }
  try {
    await c.query("ALTER TABLE news ADD COLUMN news_type VARCHAR(20) NOT NULL DEFAULT 'content' COMMENT '新闻类型' AFTER wx_link");
    console.log('Added news_type column');
  } catch (e) {
    if (e.code === 'ER_DUP_FIELDNAME') console.log('news_type already exists');
    else throw e;
  }
  const [cols] = await c.query('SHOW COLUMNS FROM news');
  cols.forEach(x => console.log(x.Field, x.Type, x.Null));
  await c.end();
})();