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<?php |
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/** |
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* @author Jared King <[email protected]> |
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* |
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* @see http://jaredtking.com |
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* |
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* @copyright 2015 Jared King |
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* @license MIT |
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*/ |
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namespace Pulsar; |
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use Pulsar\Relation\Relationship; |
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/** |
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* Represents a query against a model type. |
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*/ |
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class Query |
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{ |
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const DEFAULT_LIMIT = 100; |
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const MAX_LIMIT = 1000; |
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/** |
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* @var Model|string |
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*/ |
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private $model; |
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/** |
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* @var array |
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*/ |
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private $joins; |
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/** |
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* @var array |
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*/ |
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private $eagerLoaded; |
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/** |
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* @var array |
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*/ |
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private $where; |
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/** |
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* @var int |
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*/ |
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private $limit; |
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/** |
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* @var int |
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*/ |
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private $start; |
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/** |
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* @var array |
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*/ |
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private $sort; |
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/** |
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* @param Model|string $model |
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*/ |
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public function __construct($model = '') |
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{ |
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$this->model = $model; |
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$this->joins = []; |
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$this->eagerLoaded = []; |
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$this->where = []; |
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$this->start = 0; |
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$this->limit = self::DEFAULT_LIMIT; |
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$this->sort = []; |
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} |
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/** |
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* Gets the model class associated with this query. |
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* |
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* @return Model|string |
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*/ |
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public function getModel() |
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{ |
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return $this->model; |
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} |
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/** |
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* Sets the limit for this query. |
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* |
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* @return $this |
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*/ |
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public function limit(int $limit) |
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{ |
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$this->limit = min($limit, self::MAX_LIMIT); |
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return $this; |
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} |
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/** |
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* Gets the limit for this query. |
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*/ |
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public function getLimit(): int |
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{ |
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return $this->limit; |
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} |
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/** |
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* Sets the start offset. |
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* |
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* @return $this |
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*/ |
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public function start(int $start) |
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{ |
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$this->start = max($start, 0); |
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return $this; |
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} |
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/** |
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* Gets the start offset. |
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*/ |
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public function getStart(): int |
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{ |
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return $this->start; |
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} |
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/** |
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* Sets the sort pattern for the query. |
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* |
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* @param array|string $sort |
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* |
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* @return $this |
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*/ |
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public function sort($sort) |
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{ |
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$columns = explode(',', $sort); |
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$sortParams = []; |
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foreach ($columns as $column) { |
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$c = explode(' ', trim($column)); |
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if (2 != count($c)) { |
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continue; |
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} |
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// validate direction |
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$direction = strtolower($c[1]); |
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if (!in_array($direction, ['asc', 'desc'])) { |
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continue; |
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} |
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$sortParams[] = [$c[0], $direction]; |
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} |
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$this->sort = $sortParams; |
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return $this; |
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} |
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/** |
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* Gets the sort parameters. |
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*/ |
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public function getSort(): array |
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{ |
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return $this->sort; |
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} |
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/** |
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* Sets the where parameters. |
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* Accepts the following forms: |
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* i) where(['name' => 'Bob']) |
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* ii) where('name', 'Bob') |
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* iii) where('balance', 100, '>') |
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* iv) where('balance > 100'). |
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* |
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* @param array|string $where |
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* @param mixed $value optional value |
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* @param string|null $condition optional condition |
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* |
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* @return $this |
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*/ |
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public function where($where, $value = null, $condition = null) |
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{ |
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// handles i. |
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if (is_array($where)) { |
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$this->where = array_merge($this->where, $where); |
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} else { |
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// handles iii. |
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$args = func_num_args(); |
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if ($args > 2) { |
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$this->where[] = [$where, $value, $condition]; |
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// handles ii. |
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} elseif (2 == $args) { |
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$this->where[$where] = $value; |
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// handles iv. |
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} else { |
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$this->where[] = $where; |
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} |
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} |
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return $this; |
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} |
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/** |
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* Gets the where parameters. |
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*/ |
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public function getWhere(): array |
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{ |
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return $this->where; |
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} |
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/** |
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* Adds a join to the query. Matches a property on this model |
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* to the ID of the model we are joining. |
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* |
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* @param string $model model being joined |
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* @param string $column name of local property |
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* |
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* @return $this |
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*/ |
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public function join($model, string $column, string $foreignKey) |
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{ |
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$this->joins[] = [$model, $column, $foreignKey]; |
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return $this; |
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} |
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/** |
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* Gets the joins. |
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*/ |
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public function getJoins(): array |
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{ |
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return $this->joins; |
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} |
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/** |
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* Marks a relationship property on the model that should be eager loaded. |
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* |
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* @param string $k local property containing the relationship |
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* |
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* @return $this |
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*/ |
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public function with(string $k) |
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{ |
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if (!in_array($k, $this->eagerLoaded)) { |
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$this->eagerLoaded[] = $k; |
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} |
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return $this; |
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} |
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/** |
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* Gets the relationship properties that are going to be eager-loaded. |
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*/ |
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public function getWith(): array |
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{ |
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return $this->eagerLoaded; |
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} |
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/** |
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* Executes the query against the model's driver. |
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* |
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* @return array results |
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*/ |
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public function execute(): array |
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{ |
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// instantiate a model so that initialize() is called and properties are filled in |
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// otherwise this empty model is not used |
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$modelClass = $this->model; |
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$model = new $modelClass(); |
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return Hydrator::hydrate($modelClass::getDriver()->queryModels($this), $modelClass, $this->eagerLoaded); |
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} |
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/** |
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* Creates an iterator for a search. |
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* |
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* @return Iterator |
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*/ |
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public function all() |
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{ |
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return new Iterator($this); |
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} |
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/** |
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* Executes the query against the model's driver and returns the first result. |
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* |
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* @return array|Model|null when $limit = 1, returns a single model or null, otherwise returns an array |
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*/ |
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public function first(int $limit = 1) |
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{ |
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$models = $this->limit($limit)->execute(); |
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if (1 == $limit) { |
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return (1 == count($models)) ? $models[0] : null; |
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} |
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return $models; |
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} |
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/** |
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* Gets the number of models matching the query. |
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*/ |
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public function count(): int |
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{ |
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$model = $this->model; |
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$driver = $model::getDriver(); |
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return $driver->count($this); |
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} |
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/** |
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* Gets the sum of a property matching the query. |
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* |
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* @return number |
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*/ |
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public function sum(string $property) |
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{ |
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$model = $this->model; |
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$driver = $model::getDriver(); |
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return $driver->sum($this, $property); |
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} |
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/** |
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* Gets the average of a property matching the query. |
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* |
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* @return number |
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*/ |
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public function average(string $property) |
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{ |
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$model = $this->model; |
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$driver = $model::getDriver(); |
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return $driver->average($this, $property); |
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} |
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/** |
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* Gets the max of a property matching the query. |
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* |
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* @return number |
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*/ |
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public function max(string $property) |
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{ |
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$model = $this->model; |
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$driver = $model::getDriver(); |
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return $driver->max($this, $property); |
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} |
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/** |
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* Gets the min of a property matching the query. |
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* |
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* @return number |
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*/ |
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public function min(string $property) |
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{ |
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$model = $this->model; |
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$driver = $model::getDriver(); |
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return $driver->min($this, $property); |
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} |
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/** |
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* Updates all of the models matched by this query. |
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* |
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* @todo should be optimized to be done in a single call to the data layer |
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* |
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* @param array $params key-value update parameters |
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* |
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* @return int # of models updated |
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*/ |
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public function set(array $params): int |
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{ |
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$n = 0; |
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foreach ($this->all() as $model) { |
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$model->set($params); |
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++$n; |
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} |
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return $n; |
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} |
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/** |
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* Deletes all of the models matched by this query. |
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* |
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* @todo should be optimized to be done in a single call to the data layer |
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* |
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* @return int # of models deleted |
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*/ |
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public function delete(): int |
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{ |
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$n = 0; |
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foreach ($this->all() as $model) { |
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$model->delete(); |
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++$n; |
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} |
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return $n; |
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} |
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} |
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|
This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently.
Both the
$myVar
assignment in line 1 and the$higher
assignment in line 2 are dead. The first because$myVar
is never used and the second because$higher
is always overwritten for every possible time line.