Yii CDbConnection缓存不起作用

Question

I am having an issue getting a specific query to cache properly. Caching is working in other places in my app, so I think I have everything configured properly, but I cannot get this specific instance to work.

My config

'cache'=>array(
    'class'=>'system.caching.CFileCache',
    ),

Then, the code I am trying to execute:

static public function getCities()
{

    Yii::trace("Getting unique set of cities");
    $sqlStatement = "select distinct city from mls_data where city <> '' order by city";
    $connection = Yii::app()->db;
    $connection->cache(18000);

    $command= $connection->createCommand($sqlStatement);

    // execute an SQL query and fetch the result set
    $reader=$command->query();

    // each $row is an array representing a row of data
    foreach($reader as $row)
    {
        $returnArray[$row["city"]] = ucwords ( strtolower( substr($row["city"],0,17)));
    }

    return $returnArray;

}

The sql is executed property, and returns as expected, it just never creates a cache entry and then never pulls from the cache.

Anyone see anything I might be doing wrong here?

Answer 1

检查一下：

$connection = $connection->cache(18000);

Answer 2

您应该在查询行中应用缓存，如下所示：

$result = $command->cache(18000)->query();