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<?php
/**
* @link http://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\db\mysql;
use yii\db\ExpressionBuilderInterface;
use yii\db\ExpressionBuilderTrait;
use yii\db\ExpressionInterface;
use yii\db\JsonExpression;
use yii\db\Query;
use yii\helpers\Json;
/**
* Class JsonExpressionBuilder builds [[JsonExpression]] for MySQL DBMS.
*
* @author Dmytro Naumenko <d.naumenko.a@gmail.com>
* @since 2.0.14
*/
class JsonExpressionBuilder implements ExpressionBuilderInterface
{
use ExpressionBuilderTrait;
const PARAM_PREFIX = ':qp';
/**
* {@inheritdoc}
* @param JsonExpression|ExpressionInterface $expression the expression to be built
*/
public function build(ExpressionInterface $expression, array &$params = [])
{
$value = $expression->getValue();
if ($value instanceof Query) {
list ($sql, $params) = $this->queryBuilder->build($value, $params);
return "($sql)";
}
$placeholder = static::PARAM_PREFIX . count($params);
$params[$placeholder] = Json::encode($value);
return "CAST($placeholder AS JSON)";
}
}