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<?php |
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namespace Staudenmeir\LaravelAdjacencyList\Query\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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class MySqlGrammar extends Base implements ExpressionGrammar |
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{ |
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use OrdersByPath; |
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/** |
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* Compile an initial path. |
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* |
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* @param string $column |
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* @param string $alias |
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* @return string |
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*/ |
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public function compileInitialPath($column, $alias) |
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{ |
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return 'cast(' . $this->wrap($column) . ' as char(65535)) as ' . $this->wrap($alias); |
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} |
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/** |
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* Compile a recursive path. |
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* |
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* @param string $column |
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* @param string $alias |
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* @return string |
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*/ |
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public function compileRecursivePath($column, $alias) |
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{ |
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return 'concat(' . $this->wrap($alias) . ', ?, ' . $this->wrap($column) . ')'; |
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} |
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/** |
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* Get the recursive path bindings. |
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* |
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* @param string $separator |
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* @return array |
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*/ |
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public function getRecursivePathBindings($separator) |
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{ |
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return [$separator]; |
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} |
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/** |
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* Select a concatenated list of paths. |
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* |
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* @param \Illuminate\Database\Query\Builder $query |
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* @param string $expression |
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* @param string $column |
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* @param string $pathSeparator |
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* @param string $listSeparator |
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* @return \Illuminate\Database\Query\Builder |
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*/ |
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public function selectPathList(Builder $query, $expression, $column, $pathSeparator, $listSeparator) |
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{ |
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return $query->selectRaw( |
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'group_concat(' . $this->wrap($column) . " separator '$listSeparator')" |
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)->from($expression); |
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} |
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/** |
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* Compile an "order by path" clause. |
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* |
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* @return string |
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*/ |
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public function compileOrderByPath() |
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{ |
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$column = $this->model->getLocalKeyName(); |
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$path = $this->wrap( |
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$this->model->getPathName() |
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); |
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$pathSeparator = $this->model->getPathSeparator(); |
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if (!$this->model->isIntegerAttribute($column)) { |
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return "$path asc"; |
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} |
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return <<<SQL |
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regexp_replace( |
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regexp_replace( |
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$path, |
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'(^|[$pathSeparator])(\\\\d+)', |
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'$100000000000000000000$2' |
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), |
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'0+(\\\\d\{20\})([$pathSeparator]|$)', |
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'$1$2' |
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) asc |
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SQL; |
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} |
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/** |
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* Compile a pivot column null value. |
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* |
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* @param string $type |
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* @return string |
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*/ |
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public function compilePivotColumnNullValue(string $type): string |
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{ |
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$cast = match ($type) { |
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'bigint', 'boolean', 'integer', 'smallint' => 'signed', |
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'string' => 'char(65535)', |
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default => $type, |
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}; |
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return "cast(null as $cast)"; |
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} |
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/** |
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* Compile a cycle detection clause. |
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* |
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* @param string $localKey |
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* @param string $path |
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* @return string |
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*/ |
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public function compileCycleDetection(string $localKey, string $path): string |
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{ |
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$localKey = $this->wrap($localKey); |
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$path = $this->wrap($path); |
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return "instr($path, concat($localKey, ?)) = 1 || instr($path, concat(?, $localKey, ?)) > 1"; |
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} |
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/** |
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* Get the cycle detection bindings. |
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* |
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* @param string $pathSeparator |
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* @return array |
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*/ |
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36 |
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public function getCycleDetectionBindings(string $pathSeparator): array |
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{ |
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return [$pathSeparator, $pathSeparator, $pathSeparator]; |
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} |
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} |
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staudenmeir /
laravel-adjacency-list
