How to explode the values in the array and it as a separate columns by creating it dynamically using codeigniter

问题

public function addDynFields()
{
    $checkedfileds=$_POST['CheckedFileds'];
    $fields=implode(',',$checkedfileds);
    $dynflds = strtolower($fields);
    $dynclmns = 'add_to'.'_'.$dynflds;
    if($fields == 'Title')
    {
        $this->db->query("ALTER TABLE `pm1asset_dynamic_fields` ADD ".$dynclmns." int(11) NOT NULL");
    }
    else
    {
        $this->db->query("ALTER TABLE `pm1asset_dynamic_fields` ADD ".$dynclmns." varchar(255) NOT NULL");
    }
}

Here above code is a controller code. Here $checkedfileds is a multiple check box values in the array form. Here i want to explode the $checkedfileds(Array) values and store it as a separate columns in a table.

If i include $checkedfileds in $this->db->query("ALTER TABLE pm1asset_dynamic_fields ADD ".$checkedfileds." varchar(255) NOT NULL"); it is created as a Array as a column name in a table, suppose if i include $dynclmns in $this->db->query("ALTER TABLE pm1asset_dynamic_fields ADD ".$dynclmns." varchar(255) NOT NULL"); it created as a add_to_title but next column is not created, i don't know why it's not going to create. can any one please help me..

回答1:

Try to repair your sql query syntax and modify your codes like this :

$checkedfileds = $_POST['CheckedFileds'];
$qry = "ALTER TABLE `pm1asset_dynamic_fields` ";
foreach ($checkedfileds as $key => $value) {
    $dynflds = strtolower($value);
    $dynclmns = 'add_to' . '_' . $dynflds;
    if ($value == 'Title') {
        $qry .= "ADD COLUMN `" . $dynclmns . "` int(11) NOT NULL";
    } else {
        $qry .= "ADD COLUMN `" . $dynclmns . "` varchar(255) NOT NULL";
    }
    end($checkedfileds);
    // use (;) for the last row, otherwise use (,)
    if ($key === key($checkedfileds)) {
        $qry .= ";";
    } else {
        $qry .= ", ";
    }
}
$this->db->query($qry);

This will generate query like below :

ALTER TABLE `pm1asset_dynamic_fields` 
ADD COLUMN `add_to_title` int(11) NOT NULL,
ADD COLUMN `add_to_col2` varchar(255) NOT NULL,
ADD COLUMN `add_to_col3` varchar(255) NOT NULL;

回答2:

Try adding varchar(255) to each column

$input=$_POST['CheckedFileds'];
$checkedfileds = array_map(function($value) { return $value." varchar(255)"; }, $input);
$fields=implode(',',$checkedfileds);

来源：https://stackoverflow.com/questions/61007738/how-to-explode-the-values-in-the-array-and-it-as-a-separate-columns-by-creating

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