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<?php |
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declare(strict_types=1); |
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namespace Yiisoft\Db\Mysql; |
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use Yiisoft\Db\Expression\Expression; |
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use Yiisoft\Db\Expression\ExpressionInterface; |
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use Yiisoft\Db\Expression\JsonExpression; |
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use Yiisoft\Db\Mysql\Builder\ExpressionBuilder; |
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use Yiisoft\Db\Mysql\Builder\JsonExpressionBuilder; |
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use Yiisoft\Db\QueryBuilder\AbstractDQLQueryBuilder; |
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use function array_merge; |
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use function ctype_digit; |
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/** |
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* Implements a DQL (Data Query Language) SQL statements for MySQL, MariaDB. |
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*/ |
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final class DQLQueryBuilder extends AbstractDQLQueryBuilder |
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{ |
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public function buildLimit(ExpressionInterface|int|null $limit, ExpressionInterface|int|null $offset): string |
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{ |
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$sql = ''; |
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if ($this->hasLimit($limit)) { |
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$sql = 'LIMIT ' . ($limit instanceof ExpressionInterface ? $this->buildExpression($limit) : (string)$limit); |
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if ($this->hasOffset($offset)) { |
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$sql .= ' OFFSET ' . ($offset instanceof ExpressionInterface ? $this->buildExpression($offset) : (string)$offset); |
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} |
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} elseif ($this->hasOffset($offset)) { |
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/** |
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* Limit isn't optional in MySQL. |
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* |
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* @link https://stackoverflow.com/a/271650/1106908 |
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* @link https://dev.mysql.com/doc/refman/5.0/en/select.html#idm47619502796240 |
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*/ |
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$sql = 'LIMIT ' . |
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($offset instanceof ExpressionInterface ? $this->buildExpression($offset) : (string)$offset) . |
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', 18446744073709551615'; // 2^64-1 |
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} |
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return $sql; |
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} |
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/** |
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* Checks to see if the given limit is effective. |
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* |
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* @param mixed $limit The given limit. |
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* |
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* @return bool Whether the limit is effective. |
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*/ |
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protected function hasLimit(mixed $limit): bool |
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{ |
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/** In MySQL limit argument must be a non-negative integer constant */ |
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return ctype_digit((string) $limit); |
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} |
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/** |
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* Checks to see if the given offset is effective. |
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* |
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* @param mixed $offset The given offset. |
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* |
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* @return bool Whether the offset is effective. |
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*/ |
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protected function hasOffset(mixed $offset): bool |
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{ |
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/** In MySQL offset argument must be a non-negative integer constant */ |
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$offset = (string) $offset; |
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return ctype_digit($offset) && $offset !== '0'; |
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} |
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/** |
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* Has an array of default expression builders. |
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* |
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* Extend this method and override it if you want to change default expression builders for this query builder. |
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* |
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* {@see ExpressionBuilder} docs for details. |
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*/ |
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protected function defaultExpressionBuilders(): array |
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{ |
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return array_merge( |
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parent::defaultExpressionBuilders(), |
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[ |
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JsonExpression::class => JsonExpressionBuilder::class, |
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Expression::class => ExpressionBuilder::class, |
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] |
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); |
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} |
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} |
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yiisoft /
db-mysql
