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Initial code for a BETWEEN SQL expression object
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<?php | ||
/** | ||
* CakePHP(tm) : Rapid Development Framework (http://cakephp.org) | ||
* Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org) | ||
* | ||
* Licensed under The MIT License | ||
* For full copyright and license information, please see the LICENSE.txt | ||
* Redistributions of files must retain the above copyright notice. | ||
* | ||
* @copyright Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org) | ||
* @link http://cakephp.org CakePHP(tm) Project | ||
* @since 3.0.0 | ||
* @license http://www.opensource.org/licenses/mit-license.php MIT License | ||
*/ | ||
namespace Cake\Database\Expression; | ||
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use Cake\Database\ExpressionInterface; | ||
use Cake\Database\ValueBinder; | ||
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/** | ||
* An expression object that represents a SQL BETWEEN snippet | ||
* | ||
* @internal | ||
*/ | ||
class BetweenExpression implements ExpressionInterface { | ||
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/** | ||
* The first value in the expression | ||
* | ||
* @var mixed | ||
*/ | ||
protected $_field; | ||
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/** | ||
* The first value in the expression | ||
* | ||
* @var mixed | ||
*/ | ||
protected $_from; | ||
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/** | ||
* The second value in the expression | ||
* | ||
* @var mixed | ||
*/ | ||
protected $_to; | ||
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/** | ||
* Constructor | ||
* | ||
* @param mixed $value the value to use as the operand for the expression | ||
* @param int $mode either UnaryExpression::PREFIX or UnaryExpression::POSTFIX | ||
*/ | ||
public function __construct($field, $from, $to, $type = null) { | ||
$this->_field = $field; | ||
$this->_from = $from; | ||
$this->_to = $to; | ||
$this->$type = $type; | ||
} | ||
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/** | ||
* Converts the expression to its string representation | ||
* | ||
* @param \Cake\Database\ValueBinder $generator Placeholder generator object | ||
* @return string | ||
*/ | ||
public function sql(ValueBinder $generator) { | ||
$parts = [ | ||
'from' => $this->_from, | ||
'to' => $this->_to | ||
]; | ||
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$field = $this->_field; | ||
if ($field instanceof ExpressionInterface) { | ||
$field = $field->sql($generator); | ||
} | ||
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foreach ($parts as $name => $part) { | ||
if ($field instanceof ExpressionInterface) { | ||
$parts[$name] = $part->sql($generator); | ||
continue; | ||
} | ||
$parts[$name] = $this->_bindValue($part, $generator, $this->_type); | ||
} | ||
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return sprintf('%s BETWEEN %s AND %s', $field, $parts['from'], $parts['to']); | ||
} | ||
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/** | ||
* {@inheritDoc} | ||
* | ||
*/ | ||
public function traverse(callable $callable) { | ||
foreach ([$this->_field, $this->_from, $this->_to] as $part) { | ||
if ($part instanceof ExpressionInterface) { | ||
$callable($this->_value); | ||
} | ||
} | ||
} | ||
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/** | ||
* Registers a value in the placeholder generator and returns the generated placeholder | ||
* | ||
* @param mixed $value The value to bind | ||
* @param \Cake\Database\ValueBinder $generator The value binder to use | ||
* @param string $type The type of $value | ||
* @return string generated placeholder | ||
*/ | ||
protected function _bindValue($value, $generator, $type) { | ||
$placeholder = $generator->placeholder('c'); | ||
$generator->bind($placeholder, $value, $type); | ||
return $placeholder; | ||
} | ||
} |