PHP - 如何扩展SQLite3Result类

Question

This is what I came up with so far:

class SQLite3_extended extends SQLite3 {
  public function query($string){
    $result = parent::query($string);
    if(is_bool($result))
      return $result;
    else
      return new SQLite3Result_extended($this);
  } 
}

class SQLite3Result_extended extends SQLite3Result {
  public function test(){
    echo 'SQLite3Result extended successfully!';
  } 
}

And I get this: Fatal error: Call to private SQLite3Result::__construct() from context 'SQLite3_extended

HOW do I extend SQLite3Result class?

Answer 1

You can't. The SQLite3Result class can only be instantiated internally by SQLite3::query(); there is no way to construct an instance of this class, or of a subclass, yourself.

If you want an extensible database class, use PDO. You can use a custom subclass for statements/results by calling PDO::setAttribute() with the PDO::ATTR_STATEMENT_CLASS argument. As a bonus, it may enable you to support database engines other than SQLite.