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<?php |
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/** |
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* Aggregate functions |
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* User: moyo |
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* Date: 2018/4/19 |
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* Time: 11:13 AM |
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*/ |
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namespace Carno\Database\SQL\Actions; |
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trait Aggregate |
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{ |
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/** |
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* @var string |
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*/ |
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private $ark = 'A_R_K'; |
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/** |
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* @param mixed ...$conditions |
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* @return bool |
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*/ |
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public function exists(...$conditions) |
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{ |
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$conditions && $this->where(...$conditions); |
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return (yield $this->count()) > 0 ? true : false; |
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} |
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/** |
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* @param string $expr |
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* @return int |
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*/ |
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public function count(string $expr = '1') |
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{ |
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return (int) yield $this->calc(sprintf('COUNT(%s)', $expr)); |
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} |
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/** |
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* @param string $expr |
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* @return float |
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*/ |
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public function sum(string $expr) |
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{ |
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return (float) yield $this->calc(sprintf('SUM(%s)', $expr)); |
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} |
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/** |
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* @param string $expr |
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* @return float |
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*/ |
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public function max(string $expr) |
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{ |
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return (float) yield $this->calc(sprintf('MAX(%s)', $expr)); |
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} |
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/** |
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* @param string $expr |
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* @return float |
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*/ |
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public function min(string $expr) |
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{ |
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return (float) yield $this->calc(sprintf('MIN(%s)', $expr)); |
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} |
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/** |
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* @param string $expr |
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* @return float |
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*/ |
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public function avg(string $expr) |
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{ |
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return (float) yield $this->calc(sprintf('AVG(%s)', $expr)); |
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} |
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/** |
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* @param string $expr |
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* @return float |
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*/ |
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private function calc(string $expr) |
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{ |
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$stmt = $this->backup('select', 'orders'); |
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$this->select(sprintf('%s AS %s', $expr, $this->ark)); |
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$result = (yield $this->get())[$this->ark] ?? 0; |
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$this->restore($stmt); |
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return $result; |
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} |
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/** |
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* @param string ...$builds |
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* @return array |
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*/ |
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private function backup(string ...$builds) : array |
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{ |
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$saved = []; |
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foreach ($builds as $build) { |
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if (property_exists($this, $pt = sprintf('b%s', ucfirst($build)))) { |
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$saved[$build] = $this->$pt; |
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$this->$pt = null; |
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} |
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} |
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return $saved; |
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} |
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/** |
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* @param array $previous |
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*/ |
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private function restore(array $previous) : void |
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{ |
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foreach ($previous as $build => $saved) { |
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if (property_exists($this, $pt = sprintf('b%s', ucfirst($build)))) { |
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$this->$pt = $saved; |
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} |
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} |
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} |
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} |
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carno-php /
mysql
Loading history...
This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent.
Consider making the comparison explicit by using
empty(..)or! empty(...)instead.