php - 代码点火器错误 : Fatal error: Cannot use object of type CI_DB_mysql_result as array

Question

我正在尝试为树实现一个 php codeigniter 模型，每次运行我的 Controller 时，我都会收到以下错误:

Fatal error: Cannot use object of type CI_DB_mysql_result as array in C:\AppServ\www\tree\application\models\Btree.php on line 50

我试图在行中修复这个语法

$currentID = $row['id'];

但是，仍然收到相同的错误消息。

我的模型函数是:

public function fetchTree($parentArray, $parentID = null)
{
    // Create the query
    if ($parentID == null)
        $parentID = -1;

    $sql = "SELECT `id` FROM `{$this->tblName}` WHERE `id`= ". intval($parentID);

    // Execute the query and go through the results.
    $result = $this->db->query($sql);
    if ($result)
    {
        while ($row = $result)
        {
            // Create a child array for the current ID
            $currentID = $row['id'];
            $parentArray[$currentID] = array();

            // Print all children of the current ID
            $this->fetchTree($parentArray[$currentID], $currentID);
        }
        $result->close();
    }
}

Answer 1

你的问题出在这一行:

while($row = $result)

您正在将 $row 设置为整个查询对象。您想要遍历查询的结果。

试试这个:

$query = $this->db->query($sql);
foreach($query->result_array() AS $row) {
    $currentID = $row['id'];
    ...