CakePHP 3 Raw SQL Query

Question

I'm using CakePHP 3, I need to run a raw SQL query on multiple tables. In CakePHP 2, this could be done by using the query() method on any model ( $this->Messages->query("select..") ).

I need the method that allows me to run a SQL query in CakePHP 3. Following is the code snippet I'm using:

$aumTable = TableRegistry::get('Messages');
$sql = "SELECT (SELECT COUNT(*) FROM `messages`) AS `Total_Count`,
        (SELECT COUNT(*) FROM `messages_output`) AS `Total_Output_Count`,
        (SELECT COUNT(*) FROM `messages_output` WHERE `is_success`=1) AS `Total_Successful_Output_Count`,
        (SELECT COUNT(*) FROM `messages_output` WHERE `is_success`=0) AS `Total_Error_Output_Count`,
        (SELECT COUNT(*) FROM `users`) AS `Total_User_Count`;";

// to run this raw SQL query what method should i use? query() doesn't work..
// $result = $aumTable->query($sql); ??
// $result = $aumTable->sql($sql); ??

If you can provide links to CakePHP 3 model documentation where I can find this info, that would be helpful too. I tried searching on google but could only find questions related to CakePHP 2.

Answer 1

First you need to add the ConnectionManager:

use Cake\Datasource\ConnectionManager;

Then you need to get your connection like so:

// my_connection is defined in your database config
$conn = ConnectionManager::get('my_connection');

More info: http://book.cakephp.org/3.0/en/orm/database-basics.html#creating-connections-at-runtime

After that you can run a custom query like this:

$stmt = $conn->execute('UPDATE posts SET published = ? WHERE id = ?', [1, 2]);

More info: http://book.cakephp.org/3.0/en/orm/database-basics.html#executing-queries

And then you are ready to fetch the row(s) like this:

// Read one row.
$row = $stmt->fetch('assoc');

// Read all rows.
$rows = $stmt->fetchAll('assoc');

// Read rows through iteration.
foreach ($rows as $row) {
    // Do work
}

More info: http://book.cakephp.org/3.0/en/orm/database-basics.html#executing-fetching-rows