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<?php |
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namespace Bdf\Prime\Query\Expression; |
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use Bdf\Prime\Query\CompilableClause; |
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use Bdf\Prime\Query\Compiler\CompilerInterface; |
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use Bdf\Prime\Query\Compiler\QuoteCompilerInterface; |
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use Doctrine\DBAL\Platforms\AbstractPlatform; |
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/** |
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* Aggregation expressions |
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* Can be use on Query::select() method |
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* |
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* Usage: |
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* <code> |
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* User::select([ |
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* 'firstId' => Aggregate::min(id), |
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* 'lastId' => Aggregate::max(id), |
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* 'count' => Aggregate::count(id), |
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* ]); |
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* </code> |
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* |
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* @implements ExpressionInterface<CompilableClause&\Bdf\Prime\Query\Contract\Compilable, CompilerInterface&QuoteCompilerInterface> |
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*/ |
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abstract class Aggregate implements ExpressionInterface |
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{ |
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/** |
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* @var string |
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*/ |
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private $attribute; |
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/** |
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* Max constructor. |
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* |
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* @param string $attribute The attribute name |
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*/ |
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public function __construct(string $attribute) |
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{ |
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$this->attribute = $attribute; |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* @param CompilerInterface&QuoteCompilerInterface $compiler |
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*/ |
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final public function build(CompilableClause $query, object $compiler) |
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{ |
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$attribute = $this->attribute; |
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if ($attribute !== '*') { |
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$attribute = $compiler->quoteIdentifier($query, $query->preprocessor()->field($attribute)); |
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} |
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return $this->expression($compiler->platform()->grammar(), $attribute); |
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} |
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/** |
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* Get the aggregate expression |
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* |
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* @param AbstractPlatform $platform The database platform |
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* @param string $attribute The attribute to aggregate |
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* |
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* @return string |
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*/ |
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abstract protected function expression(AbstractPlatform $platform, string $attribute): string; |
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/** |
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* Perform MIN() aggregation function |
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* |
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* @param string $attribute The attribute to aggregate |
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* |
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* @return self |
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*/ |
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public static function min(string $attribute): self |
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{ |
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return new class ($attribute) extends Aggregate { |
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protected function expression(AbstractPlatform $platform, string $attribute): string |
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{ |
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return $platform->getMinExpression($attribute); |
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} |
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}; |
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} |
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/** |
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* Perform MAX() aggregation function |
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* |
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* @param string $attribute The attribute to aggregate |
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* |
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* @return self |
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*/ |
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public static function max(string $attribute): self |
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{ |
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return new class ($attribute) extends Aggregate { |
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protected function expression(AbstractPlatform $platform, string $attribute): string |
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{ |
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return $platform->getMaxExpression($attribute); |
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} |
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}; |
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} |
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/** |
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* Perform AVG() aggregation function |
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* |
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* @param string $attribute The attribute to aggregate |
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* |
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* @return self |
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*/ |
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public static function avg(string $attribute): self |
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{ |
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return new class ($attribute) extends Aggregate { |
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protected function expression(AbstractPlatform $platform, string $attribute): string |
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{ |
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return $platform->getAvgExpression($attribute); |
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} |
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}; |
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} |
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/** |
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* Perform COUNT() aggregation function |
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* |
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* @param string $attribute The attribute to aggregate |
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* |
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* @return self |
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*/ |
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public static function count(string $attribute = '*'): self |
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{ |
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return new class ($attribute) extends Aggregate { |
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protected function expression(AbstractPlatform $platform, string $attribute): string |
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{ |
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return $platform->getCountExpression($attribute); |
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} |
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}; |
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} |
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/** |
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* Perform SUM() aggregation function |
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* |
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* @param string $attribute The attribute to aggregate |
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* |
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* @return self |
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*/ |
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public static function sum(string $attribute): self |
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{ |
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return new class ($attribute) extends Aggregate { |
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protected function expression(AbstractPlatform $platform, string $attribute): string |
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{ |
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return $platform->getSumExpression($attribute); |
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} |
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}; |
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} |
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} |
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b2pweb /
bdf-prime
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