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<?php |
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declare(strict_types=1); |
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namespace QB\MySQL\Clause; |
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class Lock |
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{ |
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public const LOCK_IN_SHARE_MODE = 'LOCK IN SHARE MODE'; |
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public const FOR_UPDATE = 'UPDATE'; |
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public const FOR_SHARE = 'SHARE'; |
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public const MODIFIER_NOWAIT = 'NOWAIT'; |
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public const MODIFIER_SKIP_LOCKED = 'SKIP LOCKED'; |
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protected const VALID_FOR = [null, self::LOCK_IN_SHARE_MODE, self::FOR_UPDATE, self::FOR_SHARE]; |
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protected const VALID_MODIFIERS = [null, self::MODIFIER_NOWAIT, self::MODIFIER_SKIP_LOCKED]; |
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protected string $for = self::LOCK_IN_SHARE_MODE; |
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/** @var string[] */ |
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protected array $tables = []; |
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protected ?string $modifier = null; |
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/** |
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* Lock constructor. |
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* |
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* @param string|null $for |
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* @param string[] $tables |
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* @param string|null $modifier |
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*/ |
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public function __construct(?string $for = null, array $tables = [], ?string $modifier = null) |
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{ |
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if (!$this->isValid($for, $modifier)) { |
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throw new \InvalidArgumentException( |
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sprintf('invalid arguments for %s. arguments: %s', __CLASS__, print_r(func_get_args(), true)) |
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); |
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} |
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if ($for === null) { |
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1 |
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return; |
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} |
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$this->for = $for; |
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$this->tables = $tables; |
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$this->modifier = $modifier; |
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} |
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/** |
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* @param string|null $for |
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* @param string|null $modifier |
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* |
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* @return bool |
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*/ |
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private function isValid(?string $for = null, ?string $modifier = null): bool |
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{ |
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if (!in_array($for, static::VALID_FOR, true)) { |
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return false; |
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} |
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if (!in_array($modifier, static::VALID_MODIFIERS, true)) { |
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return false; |
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} |
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return true; |
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} |
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public function __toString(): string |
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{ |
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if ($this->for === self::LOCK_IN_SHARE_MODE) { |
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2 |
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return self::LOCK_IN_SHARE_MODE; |
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} |
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$parts = []; |
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$parts[] = 'FOR ' . $this->for; |
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if (count($this->tables) > 0) { |
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$parts[] = 'OF ' . implode(', ', $this->tables); |
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} |
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if ($this->modifier) { |
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$parts[] = $this->modifier; |
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} |
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return implode(' ', $parts); |
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} |
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} |
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abterphp /
qb
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