Cakephp 3 : How to get max amout row from a table

Question

我有表调用用户，例如

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

我需要最大满行数，我尝试了下面的代码，但语法错误。

  $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)'),
]); 

使用选择而不是选项数组

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

利用蛋糕的SQL函数

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

以上三个都给出相同的结果
如果您想拥有一条记录，则必须在查询对象上调用 ->first():

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