/**
* Get string for add column
*
* @param string $field_name
* @param string $params
* @param string $driver
* @return string
* @throws Kohana_Exception
*/
protected function compile_column($field_name, $params, $driver)
{
if (empty($params)) {
throw new Kohana_Exception('migrations.missing_argument');
}
$sql = $this->db->quote_column($field_name);
$params = (array) $params;
$query_params = array('type' => 'integer', 'null' => 'NULL', 'default' => '');
$type = 'integer';
$length = 0;
foreach ($params as $key => $param) {
if ($key === 0) {
$query_params['type'] = $this->is_type($param, $driver);
$type = $param;
if (in_array($param, array('primary_key', 'big_primary_key'))) {
$query_params['null'] = '';
}
} else {
switch ($key) {
case 'type':
$query_params['type'] = $this->is_type($param, $driver);
break;
case 'null':
if (!$param) {
$query_params['null'] = 'NOT NULL';
}
break;
case 'default':
if (is_string($param)) {
$param = $this->quote($param);
}
$query_params['default'] = $param;
break;
case 'length':
if ($param > 0 && $this->is_length($type)) {
$length = $param;
}
break;
}
}
}
foreach ($query_params as $key => $param) {
if ($param !== '') {
if ($key === 'default') {
$sql .= ' default';
}
$sql .= ' ' . $param;
if ($key === 'type') {
if ($length == 0) {
$length = $this->getDefault($type);
}
if ($length > 0) {
$sql .= '(' . $length . ')';
}
}
}
}
return $sql;
}
