var schema = buildSchema(`
  type Mutation {
    updateUserInfo(id: Int, name: String, email: String, job_title: String) : Boolean
    createUser(name: String, email: String, job_title: String) : Boolean
    deleteUser(id: Int) : Boolean
  }
`);

var root = {
  updateUserInfo: (args, req) => queryDB(req, "update users SET ? where id = ?", [args, args.id]).then(data => data),
  createUser: (args, req) => queryDB(req, "insert into users SET ?", args).then(data => data),
  deleteUser: (args, req) => queryDB(req, "delete from users where id = ?", [args.id]).then(data => data)
};