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<?php |
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namespace Staudenmeir\EloquentEagerLimit\Grammars; |
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use Illuminate\Database\Query\Builder; |
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use Illuminate\Database\Query\Grammars\MySqlGrammar as Base; |
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use Illuminate\Support\Str; |
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use PDO; |
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class MySqlGrammar extends Base |
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{ |
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use CompilesGroupLimit { |
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compileGroupLimit as compileGroupLimitParent; |
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} |
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/** |
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* Determine whether to use a group limit clause for MySQL < 8.0. |
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* |
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* @param \Illuminate\Database\Query\Builder $query |
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* @return bool |
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*/ |
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public function useLegacyGroupLimit(Builder $query) |
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{ |
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$version = $query->getConnection()->getReadPdo()->getAttribute(PDO::ATTR_SERVER_VERSION); |
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return version_compare($version, '8.0.11') < 0 && !Str::contains($version, 'MariaDB'); |
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} |
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/** |
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* Compile a group limit clause. |
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* |
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* @param \Illuminate\Database\Query\Builder $query |
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* @return string |
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*/ |
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protected function compileGroupLimit(Builder $query) |
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{ |
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return $this->useLegacyGroupLimit($query) |
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? $this->compileLegacyGroupLimit($query) |
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: $this->compileGroupLimitParent($query); |
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} |
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/** |
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* Compile a group limit clause for MySQL < 8.0. |
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* |
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* Derived from https://softonsofa.com/tweaking-eloquent-relations-how-to-get-n-related-models-per-parent/. |
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* |
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* @param \Illuminate\Database\Query\Builder $query |
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* @return string |
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*/ |
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protected function compileLegacyGroupLimit(Builder $query) |
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{ |
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$limit = (int) $query->groupLimit['value']; |
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$offset = $query->offset; |
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if (isset($offset)) { |
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$limit += (int) $offset; |
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$query->offset = null; |
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} |
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$column = last(explode('.', $query->groupLimit['column'])); |
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$column = $this->wrap($column); |
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$partition = ', @laravel_row := if(@laravel_partition = '.$column.', @laravel_row + 1, 1) as laravel_row'; |
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$partition .= ', @laravel_partition := '.$column; |
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$orders = (array) $query->orders; |
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array_unshift($orders, ['column' => $query->groupLimit['column'], 'direction' => 'asc']); |
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$query->orders = $orders; |
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$components = $this->compileComponents($query); |
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$sql = $this->concatenate($components); |
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$from = '(select @laravel_row := 0, @laravel_partition := 0) as laravel_vars, ('.$sql.') as laravel_table'; |
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$sql = 'select laravel_table.*'.$partition.' from '.$from.' having laravel_row <= '.$limit; |
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if (isset($offset)) { |
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$sql .= ' and laravel_row > '.(int) $offset; |
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} |
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return $sql.' order by laravel_row'; |
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} |
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} |
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staudenmeir /
eloquent-eager-limit
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