CDbCommand：减少列本身的值

Question

我想用CDbCommand运行SQL脚本：

update user set point = point - 2 where user_id = 13 and role_id = 2;

我的代码使用Yii CDbCommand：

Yii::app()->db->createCommand()->update(
  'user',
  array('point'=>'point + 2'),
  array('user_id' => 13, 'role_id'=>':role'),
  array('role'=>2)
);

然后我收到错误：

CDbCommand failed to execute the SQL statement: SQLSTATE[HY093]: Invalid parameter number: number of bound variables does not match number of tokens. The SQL statement executed was: UPDATE `user` SET `point`=:point

问题是什么？

Answer 1

这样做：

  Currency Int   Rate
0  $111.23  23  0.03%
1  $321.23   3  0.10%