Codeigniter error : Fatal error: Cannot use object of type CI_DB_mysql_result as array

问题

I'm trying to implement a php codeigniter model for tree and every time I run my controller, I am getting the following error :

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

I tried to fix this syntax in line

$currentID = $row['id'];

however, still getting the same error message.

My model function is:

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();
    }
}

回答1:

Your problem is with this line:

while($row = $result)

You're setting $row to the entire query object. You want to loop through the results of the query.

Try this instead:

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

回答2:

just the simpler solution is to have direct conversion to arrays:

$result = $this->db->query($sql)->result_array();

回答3:

try this

    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();
    }
}

来源：https://stackoverflow.com/questions/20022662/codeigniter-error-fatal-error-cannot-use-object-of-type-ci-db-mysql-result-as

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