/**
* Returns a Field object. If the column is NOT in the table, a
* Error is thrown by the Field constructor
* @param string $column_name Name of the column in this table
* @param string $alias Query alias used when referencing this field
* @return Field
*/
public function getField($column_name, $alias = null)
{
if (!$this->db->allowed($column_name)) {
throw new \Exception(t('Improper column name "%s"', $column_name));
}
$field = new Field($this, $column_name, $alias);
if (!($field->allowSplat() && $column_name == '*') && (DATABASE_CHECK_COLUMNS && !$this->columnExists($column_name))) {
throw new \Exception(t('Column does not exist in %s "%s"', get_class($this), $this->getFullName()));
}
return $field;
}
