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| 1 | <?php declare(strict_types=1); |
| 2 | /* |
| 3 | * This file is part of Aplus Framework Database Library. |
| 4 | * |
| 5 | * (c) Natan Felles <natanfelles@gmail.com> |
| 6 | * |
| 7 | * For the full copyright and license information, please view the LICENSE |
| 8 | * file that was distributed with this source code. |
| 9 | */ |
| 10 | namespace Framework\Database\Definition\Table\Indexes\Keys; |
| 11 | |
| 12 | use InvalidArgumentException; |
| 13 | use LogicException; |
| 14 | |
| 15 | /** |
| 16 | * Class ForeignKey. |
| 17 | * |
| 18 | * @see https://mariadb.com/kb/en/foreign-keys/ |
| 19 | * |
| 20 | * @package database |
| 21 | */ |
| 22 | final class ForeignKey extends ConstraintKey |
| 23 | { |
| 24 | /** |
| 25 | * The change is allowed and propagates on the child table. |
| 26 | * For example, if a parent row is deleted, the child row is also deleted; |
| 27 | * if a parent row's ID changes, the child row's ID will also change. |
| 28 | * |
| 29 | * @var string |
| 30 | */ |
| 31 | public const OPT_CASCADE = 'CASCADE'; |
| 32 | /** |
| 33 | * Synonym for RESTRICT. |
| 34 | * |
| 35 | * @see ForeignKey::OPT_RESTRICT |
| 36 | * |
| 37 | * @var string |
| 38 | */ |
| 39 | public const OPT_NO_ACTION = 'NO ACTION'; |
| 40 | /** |
| 41 | * The change on the parent table is prevented. |
| 42 | * The statement terminates with a 1451 error (SQLSTATE '2300'). |
| 43 | * This is the default behavior for both ON DELETE and ON UPDATE. |
| 44 | * |
| 45 | * @var string |
| 46 | */ |
| 47 | public const OPT_RESTRICT = 'RESTRICT'; |
| 48 | /** |
| 49 | * The change is allowed, and the child row's foreign key columns are set |
| 50 | * to NULL. |
| 51 | * |
| 52 | * @var string |
| 53 | */ |
| 54 | public const OPT_SET_NULL = 'SET NULL'; |
| 55 | protected string $type = 'FOREIGN KEY'; |
| 56 | protected ?string $referenceTable = null; |
| 57 | /** |
| 58 | * @var array<string> |
| 59 | */ |
| 60 | protected array $referenceColumns = []; |
| 61 | protected ?string $onDelete = null; |
| 62 | protected ?string $onUpdate = null; |
| 63 | |
| 64 | /** |
| 65 | * @param string $table |
| 66 | * @param string $column |
| 67 | * @param string ...$columns |
| 68 | * |
| 69 | * @return static |
| 70 | */ |
| 71 | public function references(string $table, string $column, string ...$columns) : static |
| 72 | { |
| 73 | $this->referenceTable = $table; |
| 74 | $this->referenceColumns = $columns ? \array_merge([$column], $columns) : [$column]; |
| 75 | return $this; |
| 76 | } |
| 77 | |
| 78 | protected function renderReferences() : string |
| 79 | { |
| 80 | if ($this->referenceTable === null) { |
| 81 | throw new LogicException('REFERENCES clause was not set'); |
| 82 | } |
| 83 | $table = $this->database->protectIdentifier($this->referenceTable); |
| 84 | $columns = []; |
| 85 | foreach ($this->referenceColumns as $column) { |
| 86 | $columns[] = $this->database->protectIdentifier($column); |
| 87 | } |
| 88 | $columns = \implode(', ', $columns); |
| 89 | return " REFERENCES {$table} ({$columns})"; |
| 90 | } |
| 91 | |
| 92 | /** |
| 93 | * @param string $option |
| 94 | * |
| 95 | * @return static |
| 96 | */ |
| 97 | public function onDelete(string $option) : static |
| 98 | { |
| 99 | $this->onDelete = $option; |
| 100 | return $this; |
| 101 | } |
| 102 | |
| 103 | protected function renderOnDelete() : ?string |
| 104 | { |
| 105 | if ($this->onDelete === null) { |
| 106 | return null; |
| 107 | } |
| 108 | $reference = $this->makeReferenceOption($this->onDelete); |
| 109 | return " ON DELETE {$reference}"; |
| 110 | } |
| 111 | |
| 112 | /** |
| 113 | * @param string $option |
| 114 | * |
| 115 | * @return static |
| 116 | */ |
| 117 | public function onUpdate(string $option) : static |
| 118 | { |
| 119 | $this->onUpdate = $option; |
| 120 | return $this; |
| 121 | } |
| 122 | |
| 123 | protected function renderOnUpdate() : ?string |
| 124 | { |
| 125 | if ($this->onUpdate === null) { |
| 126 | return null; |
| 127 | } |
| 128 | $reference = $this->makeReferenceOption($this->onUpdate); |
| 129 | return " ON UPDATE {$reference}"; |
| 130 | } |
| 131 | |
| 132 | private function makeReferenceOption(string $option) : string |
| 133 | { |
| 134 | $result = \strtoupper($option); |
| 135 | if (\in_array($result, ['RESTRICT', 'CASCADE', 'SET NULL', 'NO ACTION'], true)) { |
| 136 | return $result; |
| 137 | } |
| 138 | throw new InvalidArgumentException("Invalid reference option: {$option}"); |
| 139 | } |
| 140 | |
| 141 | protected function renderTypeAttributes() : ?string |
| 142 | { |
| 143 | return $this->renderReferences() . $this->renderOnDelete() . $this->renderOnUpdate(); |
| 144 | } |
| 145 | } |