Add a WHERE column = value clause to your query. Each time
this is called in the chain, an additional WHERE will be
added, and these will be ANDed together when the final query
is built.
public function where($column_name, $value)
{
if (is_null($value)) {
return $this->where_null($column_name);
}
return $this->where_equal($column_name, $value);
}
