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:

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// 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.

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

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

Return the value of the expression as a string.

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echo $expression;

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

Get the expression value as a string.

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$sql = $expression->value();

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