Cakephp 3:如何从表中获取max amout行

Question

我有表呼叫用户,比如

id name amount   created
1   a   100     6-16-2016
2   b   200     5-16-2016

我需要最大量的完整行,我已尝试下面的代码,但得到语法错误.

  $user = $this->Users->find('all',[
         'fields' => array('MAX(Users.amount)  AS amount'),
  ]); 

Answer 1

最简单的方法

$user = $this->Users->find('all',[
   'fields' => array('amount' => 'MAX(Users.id)'),
]); 

使用select而不是options数组

$user = $this->Users->find()
    ->select(['amount' => 'MAX(Users.id)']); 

利用蛋糕SQL函数

$query = $this->Users->find();
$user = $query
    ->select(['amount' => $query->func()->max('Users.id')]);

以上三者都给出了相同的结果

如果你想拥有一条记录,你必须调用->first()查询对象:

$user = $user->first();
$amount = $user->amount;