Modules

Kohana_Database_Expression

Database expressions can be used to add unescaped SQL fragments to a Database_Query_Builder object.

For example, you can use an expression to generate a column alias:

// SELECT CONCAT(first_name, last_name) AS full_name
$query = DB::select(array(DB::expr('CONCAT(first_name, last_name)'), 'full_name')));

More examples are available on the Query Builder page

Class declared in MODPATH/database/classes/kohana/database/expression.php on line 19.

Sets the expression string.

$expression = new Database_Expression('COUNT(users.id)');

public function __construct($value)
{
	// Set the expression string
	$this->_value = $value;
}

Return the value of the expression as a string.

echo $expression;

public function __toString()
{
	return $this->value();
}

Get the expression value as a string.

$sql = $expression->value();

public function value()
{
	return (string) $this->_value;
}