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add: 'lazy' method #103

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add: 'lazy' method #103

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18 changes: 18 additions & 0 deletions src/ResultSet.php
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Original file line number Diff line number Diff line change
Expand Up @@ -85,6 +85,24 @@ public function allGroup($uniq = false, $callable = null)
return $this->statement->fetchAll($fetchStyle | PDO::FETCH_FUNC, $callable);
}

/**
* Return a generator that fetches each row at a time, reducing memory load.
*
* @param int $fetchStyle (optional) PDO fetch style
*
* @return iterable
*/
public function lazy($fetchStyle = 0)
{
$generator = function() use (&$fetchStyle) {
while($row = $this->statement->fetch($fetchStyle)) {
yield $row;
}
};

return $generator();
}

/**
* Fetch first result
*
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