CakePHP在许多“ SET CHARACTER SET utf8”查询中找到调用结果。为什么？

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;

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

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

    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
            )

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