/**
* simple subselect emulation: leaves the query untouched for all RDBMS
* that support subselects
*
* @param string the SQL query for the subselect that may only
* return a column
* @param string determines type of the field
*
* @return string the query
*/
public function subSelect($query, $type = false)
{
if ($this->supports('sub_selects') === true) {
return $query;
}
if (!$this->supports('sub_selects')) {
return MDB2_Driver_Common::raiseError(MDB2_ERROR_UNSUPPORTED, null, null, 'method not implemented', __FUNCTION__);
}
$col = $this->queryCol($query, $type);
if (MDB2::isError($col)) {
return $col;
}
if (!is_array($col) || count($col) == 0) {
return 'NULL';
}
if ($type) {
$this->loadModule('Datatype', null, true);
return $this->datatype->implodeArray($col, $type);
}
return implode(', ', $col);
}
