114 lines
3.6 KiB
PHP
114 lines
3.6 KiB
PHP
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<?php
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declare(strict_types=1);
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/**
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* CakePHP(tm) : Rapid Development Framework (https://cakephp.org)
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* Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
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*
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* Licensed under The MIT License
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* For full copyright and license information, please see the LICENSE.txt
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* Redistributions of files must retain the above copyright notice.
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*
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* @copyright Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
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* @link https://cakephp.org CakePHP(tm) Project
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* @since 3.0.0
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* @license https://opensource.org/licenses/mit-license.php MIT License
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*/
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namespace Cake\Database\Driver;
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use Cake\Database\Expression\IdentifierExpression;
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use Cake\Database\Expression\QueryExpression;
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use Cake\Database\Expression\TupleComparison;
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use Cake\Database\Query;
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use RuntimeException;
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/**
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* Provides a translator method for tuple comparisons
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*
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* @internal
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*/
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trait TupleComparisonTranslatorTrait
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{
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/**
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* Receives a TupleExpression and changes it so that it conforms to this
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* SQL dialect.
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*
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* It transforms expressions looking like '(a, b) IN ((c, d), (e, f))' into an
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* equivalent expression of the form '((a = c) AND (b = d)) OR ((a = e) AND (b = f))'.
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*
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* It can also transform transform expressions where the right hand side is a query
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* selecting the same amount of columns as the elements in the left hand side of
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* the expression:
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*
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* (a, b) IN (SELECT c, d FROM a_table) is transformed into
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*
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* 1 = (SELECT 1 FROM a_table WHERE (a = c) AND (b = d))
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*
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* @param \Cake\Database\Expression\TupleComparison $expression The expression to transform
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* @param \Cake\Database\Query $query The query to update.
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* @return void
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*/
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protected function _transformTupleComparison(TupleComparison $expression, Query $query): void
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{
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$fields = $expression->getField();
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if (!is_array($fields)) {
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return;
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}
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$operator = strtoupper($expression->getOperator());
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if (!in_array($operator, ['IN', '='])) {
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throw new RuntimeException(
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sprintf(
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'Tuple comparison transform only supports the `IN` and `=` operators, `%s` given.',
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$operator
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)
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);
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}
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$value = $expression->getValue();
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$true = new QueryExpression('1');
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if ($value instanceof Query) {
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$selected = array_values($value->clause('select'));
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foreach ($fields as $i => $field) {
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$value->andWhere([$field => new IdentifierExpression($selected[$i])]);
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}
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$value->select($true, true);
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$expression->setField($true);
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$expression->setOperator('=');
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return;
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}
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$type = $expression->getType();
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if ($type) {
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/** @var array<string, string> $typeMap */
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$typeMap = array_combine($fields, $type) ?: [];
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} else {
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$typeMap = [];
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}
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$surrogate = $query->getConnection()
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->selectQuery($true);
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if (!is_array(current($value))) {
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$value = [$value];
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}
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$conditions = ['OR' => []];
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foreach ($value as $tuple) {
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$item = [];
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foreach (array_values($tuple) as $i => $value2) {
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$item[] = [$fields[$i] => $value2];
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}
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$conditions['OR'][] = $item;
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}
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$surrogate->where($conditions, $typeMap);
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$expression->setField($true);
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$expression->setValue($surrogate);
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$expression->setOperator('=');
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}
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}
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