如何使用Knex查找或创建？

const knex = require('knex')({
  client: 'mysql',
  connection: {
    host: 'your_database_host',
    user: 'your_username',
    password: 'your_password',
    database: 'your_database_name'
  }
});

knex.select('*').from('users').where('age', '>', 18)
  .then(rows => {
    console.log(rows);
  })
  .catch(error => {
    console.error(error);
  })
  .finally(() => {
    knex.destroy();
  });

knex('users').insert({ name: 'John', age: 25 })
  .then(() => {
    console.log('User created successfully');
  })
  .catch(error => {
    console.error(error);
  })
  .finally(() => {
    knex.destroy();
  });