CakePHP finds the result of the call in many queries "SET CHARACTER SET utf8". What for?

What is the reason CakePHP makes the query “SET CHARACTER SET utf8” 38 times in a row for a simple find (“all”) (the default recursive property is 0)?

I use MySQL as a database and I can say that I am creating a user table that looks like this:

CREATE TABLE users (
id INT NOT NULL AUTO_INCREMENT,
username char(50) UNIQUE,
password char(40),
post_id INT,
created DATETIME,
modified DATETIME,
CONSTRAINT PRIMARY KEY (id),
CONSTRAINT FOREIGN KEY (post_id) REFERENCES posts (id)
    ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=INNODB;

and a message table that looks like this:

CREATE TABLE posts (
id INT NOT NULL AUTO_INCREMENT,
title VARCHAR(30) NOT NULL,
content TEXT NOT NULL,
CONSTRAINT PRIMARY KEY (id)
) ENGINE=INNODB;

In my users_controller.php, I write in action:

$log = $this->User->getDataSource()->getLog(false, false);
$this->User->find("all",
array(
   'conditions' => array('id' => 3),
   'recursive' => 0
));
debug($log);

I did not test this with the above data, but showed the above tables because they are similar to my current database. I use 25 tables with engine = innodb.

Debugging is an array of 41 requests, where 2 requests retrieve the user and the message. The remaining 39 queries are identical and look like this:

    Array
(
    [log] => Array
    (
        [0] => Array
            (
                [query] => SET CHARACTER SET utf8;
                [error] => 
                [affected] => 0
                [numRows] => 
                [took] => 0
            )

        [1] => Array
            (
                [query] => SET CHARACTER SET utf8;
                [error] => 
                [affected] => 0
                [numRows] => 
                [took] => 0
            )
                 .
                 .
                 .
            [38] => Array
            (
                [query] => SET CHARACTER SET utf8;
                [error] => 
                [affected] => 0
                [numRows] => 
                [took] => 0
            )

? config/database.php , "utf8" . "utf8", 38 .

var $default = array(
    'driver' => 'mysql',
    'persistent' => false,
    'host' => 'localhost',
    'login' => 'mylogin',
    'password' => 'mypassword',
    'database' => 'mydatabase',
            'encoding' => 'utf8'
);