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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\SqlServerGrammar as Base; |
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use RuntimeException; |
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class SqlServerGrammar 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($column).' as varchar(max)) as '.$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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* @param bool $reverse |
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* @return string |
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*/ |
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public function compileRecursivePath($column, $alias, bool $reverse = false) |
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{ |
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$wrappedColumn = $this->wrap($column); |
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$wrappedAlias = $this->wrap($alias); |
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if ($reverse) { |
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return "cast(cast($wrappedColumn as varchar(max)) + ? + $wrappedAlias as varchar(max)) as $wrappedAlias"; |
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} |
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return "cast($wrappedAlias + ? + cast($wrappedColumn as varchar(max)) as varchar(max)) as $wrappedAlias"; |
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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 $query->selectRaw( |
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'stuff((select ? + '.$this->wrap($column).' from '.$this->wrapTable($expression)." for xml path('')), 1, ?, '')", |
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[$listSeparator, strlen($listSeparator)] |
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); |
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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 $typeName |
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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 $typeName, string $type): string |
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{ |
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throw new RuntimeException('This graph relationship feature is not supported on SQL Server.'); // @codeCoverageIgnore |
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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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$castLocalKey = "cast($localKey as varchar(max))"; |
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return "charindex($castLocalKey + ?, $path) > 0 or charindex(? + $castLocalKey + ?, $path) > 0"; |
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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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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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* Compile the initial select expression for a cycle detection clause. |
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* |
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* @param string $column |
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* @return string |
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*/ |
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public function compileCycleDetectionInitialSelect(string $column): string |
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{ |
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return '0 as ' . $this->wrap($column); |
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} |
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/** |
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* Compile the recursive select expression for a cycle detection clause. |
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* |
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* @param string $sql |
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* @param string $column |
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* @return string |
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*/ |
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public function compileCycleDetectionRecursiveSelect(string $sql, string $column): string |
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{ |
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return "case when $sql then 1 else 0 end as " . $this->wrap($column); |
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} |
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/** |
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* Compile the stop constraint for a cycle detection clause. |
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* |
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* @param string $column |
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* @return string |
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*/ |
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public function compileCycleDetectionStopConstraint(string $column): string |
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{ |
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return $this->wrap($column) . ' = 0'; |
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} |
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/** |
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* Determine whether the database supports the UNION operator in a recursive expression. |
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* |
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* @return bool |
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*/ |
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public function supportsUnionInRecursiveExpression(): bool |
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{ |
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return false; |
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} |
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} |
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staudenmeir /
laravel-adjacency-list
