CodeIgniter multidimensional array store in mysql database single column

问题

I am trying to store this data in database but i am getting error. how to fix this?

I want simply store multidimensional array in a single column.

$data = array(
            '2017' => array(
                '6' => array(
                    '10' => array(
                        'count' => 76
                    ),
                ),
            ),
        );

$getdata = $this->view_count->setView($data);

Model

public function setView($data)
    {
        $setData = $this->db->where('short', 'honwl')->update('ci_links', $data['view_count']);
        return $setData;
    }

Error which i am getting A PHP Error was encountered

Severity: Notice

Message: Undefined index: view_count

Filename: models/View_count.php

Line Number: 14

Backtrace:

File: C:\wamp\www\blog\application\models\View_count.php Line: 14 Function: _error_handler

File: C:\wamp\www\blog\application\controllers\Dashbord.php Line: 52 Function: setView

File: C:\wamp\www\blog\index.php Line: 315 Function: require_once

A Database Error Occurred

You must use the "set" method to update an entry.

Filename: C:/wamp/www/blog/system/database/DB_query_builder.php

Line Number: 1864

回答1:

As message says, you don't have key $data['view_count'] but you have $data[2017][6][10]['count'] value. I asume those dates are changed dynamically so you need to get value of inner array by key count. If your array always has similar keys i.e. $data[year][month][day][count], you can use code (bit modified) from this answer to get that key value. Put in your model

private function getCount($arr, $search)
{
    $iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($arr)); 
    foreach($iterator as $key => $value) {
        if($search == $key && $value !== '') {
            return $value;
        }
    }
    return false;
}

Then in your first method use value filtered through this function:

public function setView($data)
{
    $count = $this->getCount($data, 'count');

    if ($count !== false) {
        $setData = $this->db->where('short', 'honwl')->update('ci_links', $count);
        return $setData;
    }
    return false;
}

回答2:

According to you example code, you can encode array data to JSON for saving to column, then get back by decode:

Controller:

$data = array(
            '2017' => array(
                '6' => array(
                    '10' => array(
                        'count' => 76
                    ),
                ),
            ),
        );

$getdata = $this->view_count->setView($data);
$data = $this->view_count->getView();

Model:

public function setView($data)
{
    $data = json_encode($data);
    $setData = $this->db->where('short', 'honwl')->update('ci_links', array('column_name'=>$data));
    return $setData;
}

public function getView($data)
{
    $row = $this->db->where('short', 'honwl')->get('ci_links')->row();
    return json_decode($row->column_name, true);
}

The column_name depends on your table's column name that save the array data.

来源：https://stackoverflow.com/questions/44475620/codeigniter-multidimensional-array-store-in-mysql-database-single-column

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