ZendFramework 最近 24 小时内的平均通话时长

Question

我在使用 ZendFramework 中的 MYSQL 查询时遇到了一些问题，我想获得过去 24 小时内的平均通话时长并像这样查询：

SELECT AVG(duration) FROM table1 where calldate > DATE_SUB(CURDATE(), INTERVAL 24 HOUR;

这里是我的 ZendFramework 中的代码：
型号：

<?php
class Model_Cdr extends Zend_Db_Table_Abstract
{
    protected $_name = 'table1';
    protected $_schema = 'db1';
}

控制器：

$callModel= new Model_Cdr();
  $select_tot_24 = $callModel->fetchAll($callModel->select()->where("calldate > DATE_SUB(CURDATE(), INTERVAL 24 HOUR)" ));
  echo $avg_24 = AVG($select_tot_24);

我也试过这个：

$callModel= new Model_Cdr();
 $avg_24_1 = $callModel->fetchAll("SELECT AVG(duration WHERE calldate > DATE_SUB(CURDATE(), INTERVAL 1 HOUR))");

Answer 1

使用Zend_Db_Table_Select:

$callModel = new Model_Cdr();
$select = $callModel->select()
                    ->from('table1', array('average' => 'AVG(duration)'))
                    ->where('calldate > DATE_SUB(CURDATE(), INTERVAL 24 HOUR)');

$row = $callModel->fetchRow($select);
echo 'Average time: ' . $row->average;

Answer 2

使用它：

$callModel = new Model_Cdr();
$select = $callModel->select()
            ->from($callModel, array('average' => 'AVG(duration)'))
           ->where('calldate > DATE_SUB(CURDATE(), INTERVAL 24 HOUR)');

  $row = $callModel->fetchRow($select);
  echo 'Average time: ' . $row->average;

ZendFramework 最近 24 小时内的平均通话时长

average call duration in last 24 hours ZendFramework

php

mysql

zend-framework