pdo总是返回false

Question

<?php
class Group {
    private $db, $last_id;

    public function __construct() {
        $this->db = Database::connect();
    }

    public function createGroup($admin_id, $name, $description, $type) {
        $sql = "INSERT INTO group SET admin_id = ?, name = ?, description = ?, type = ?";
        $query = $this->db->prepare($sql);
        $result = $query->execute(array($admin_id, $name, $description, $type));
        if ($result) {
            $this->last_id = $this->db->lastInsertId();
            return $this->last_id;
        }
        return "false";
    }

}

?>

Here is my test.php :

<?php
error_reporting(E_ALL);
require "includes/database.php";
require "classes/C_Group.php";

$obj = new Group;
$result = $obj->createGroup(1, "groupName", "groupDescription", "groupType");
echo $result;
?>

Table screenshot :

It always returns false, i also tried insert only one parameter (name) into table, but it return false again. And nothing inserted in table.

Answer 1

group是保留字是mysql必须在反引号中

 $sql = "INSERT INTO `group` SET admin_id = ?, name = ?, description = ?, type = ?";