/**
* Update the SELECT clause of the query with the columns from the given table
*/
protected function selectColumnsFromTable(SQLQuery &$query, $tableClass, $columns = null)
{
// Add SQL for multi-value fields
$databaseFields = DataObject::database_fields($tableClass);
$compositeFields = DataObject::composite_fields($tableClass, false);
if ($databaseFields) {
foreach ($databaseFields as $k => $v) {
if ((is_null($columns) || in_array($k, $columns)) && !isset($compositeFields[$k])) {
// Update $collidingFields if necessary
if ($expressionForField = $query->expressionForField($k)) {
if (!isset($this->collidingFields[$k])) {
$this->collidingFields[$k] = array($expressionForField);
}
$this->collidingFields[$k][] = "\"{$tableClass}\".\"{$k}\"";
} else {
$query->selectField("\"{$tableClass}\".\"{$k}\"", $k);
}
}
}
}
if ($compositeFields) {
foreach ($compositeFields as $k => $v) {
if ((is_null($columns) || in_array($k, $columns)) && $v) {
$dbO = Object::create_from_string($v, $k);
$dbO->addToQuery($query);
}
}
}
}
/**
* @param String $field Select statement identifier, either the unquoted column name,
* the full composite SQL statement, or the alias set through {@link SQLQuery->selectField()}.
* @param SQLQuery $query
* @return String
*/
protected function expressionForField($field, $query)
{
// Special case for ID
if ($field == 'ID') {
$baseClass = ClassInfo::baseDataClass($this->dataClass);
return "\"{$baseClass}\".\"ID\"";
} else {
return $query->expressionForField($field);
}
}
