Yii - 直接执行SQL语句

例子如下：

例1

$connection = Yii::app()->db;
$sql = "SELECT * FROM `project` ORDER BY id DESC";
$command = $connection->createCommand($sql);
$result = $command->queryAll();
print_r($result);

例2

$db = Yii::app()->db; //you have to define db connection in config/main.php
$sql = "select sum(if(starttime>'09:00:00',1,0)) as late,
  sum(if(endtime<'18:00:00',1,0)) as early         
from present where userid=:userid and date between :date_start and :date_end"
$results = $db->createCommand($sql)->query(array(
  ':userid' => 115,':date_start'=>'2009-12-1',':date_end'=>'2009-12-31',
));
foreach($results as $result){
  echo $result['late']," and ",$result['early']," \n";
}

例3

$sql = "select sum(if(starttime>'09:00:00',1,0)) as late,
  sum(if(endtime<'18:00:00',1,0)) as early         
from present where userid=115 and date between '2009-12-1' and '2009-12-31'"
$results = $db->createCommand($sql)->query();
foreach($results as $result){
  echo $result['late']," and ",$result['early']," \n";
}

说明：把查询条件作为参数（如例2），比较安全，可直接避免注入。要是直接用在SQL语句中，最好要经过防注入处理。