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<?php |
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namespace Helix\DB; |
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use Helix\DB; |
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/** |
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* Array storage in an extension table. |
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* |
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* @method static static factory(DB $db, string $name, string $valueType = 'string') |
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*/ |
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class EAV extends Table { |
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/** |
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* @var string |
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*/ |
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protected $valueType; |
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/** |
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* @param DB $db |
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* @param string $name |
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* @param string $valueType PHP-native scalar type (implied nullable). |
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*/ |
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public function __construct (DB $db, string $name, string $valueType = 'string') { |
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parent::__construct($db, $name, ['entity', 'attribute', 'value']); |
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$this->valueType = $valueType; |
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} |
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/** |
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* Whether an entity has an attribute. |
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* |
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* @param int $id |
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* @param string $attribute |
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* @return bool |
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*/ |
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public function exists (int $id, string $attribute): bool { |
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$statement = $this->cache(__FUNCTION__, function() { |
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return $this->select(['COUNT(*) > 0'])->where('entity = ? AND attribute = ?')->prepare(); |
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}); |
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$exists = (bool)$statement([$id, $attribute])->fetchColumn(); |
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$statement->closeCursor(); |
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return $exists; |
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} |
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/** |
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* Pivots and self-joins to return a {@link Select} for the `entity` column, |
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* matching on attribute and value. |
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* |
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* @see DB::match() |
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* |
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* @param array $match `[attribute => value]`. If empty, selects all IDs for entities having at least one attribute. |
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* @return Select |
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*/ |
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public function find (array $match) { |
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$select = $this->select([$this['entity']]); |
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$prior = $this; |
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foreach ($match as $attribute => $value) { |
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$alias = $this->setName("{$this}__{$attribute}"); |
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$select->join("{$this} AS {$alias}", |
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$alias['entity']->isEqual($prior['entity']), |
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$alias['attribute']->isEqual($attribute), |
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$this->db->match($alias['value'], $value) |
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); |
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$prior = $alias; |
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} |
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$select->group($this['entity']); |
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return $select; |
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} |
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/** |
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* @return string |
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*/ |
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final public function getValueType (): string { |
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return $this->valueType; |
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} |
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/** |
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* Returns an entity's attributes. |
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* |
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* @param int $id |
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* @return array `[attribute => value]` |
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*/ |
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public function load (int $id): array { |
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$statement = $this->cache(__FUNCTION__, function() { |
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$select = $this->select(['attribute', 'value']); |
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$select->where('entity = ?'); |
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$select->order('attribute'); |
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return $select->prepare(); |
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}); |
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return array_map([$this, 'setType'], $statement([$id])->fetchAll(DB::FETCH_KEY_PAIR)); |
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} |
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/** |
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* Returns associative attribute-value arrays for the given IDs. |
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* |
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* @param int[] $ids |
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* @return array[] `[id => attribute => value] |
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*/ |
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public function loadAll (array $ids): array { |
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if (empty($ids)) { |
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return []; |
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} |
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if (count($ids) === 1) { |
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return [current($ids) => $this->load(current($ids))]; |
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} |
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$loadAll = $this->select(['entity', 'attribute', 'value']) |
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->where($this->db->match('entity', $this->db->marks($ids))) |
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->order('entity, attribute'); |
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$values = array_fill_keys($ids, []); |
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foreach ($loadAll->getEach(array_values($ids)) as $row) { |
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$values[$row['entity']][$row['attribute']] = $this->setType($row['value']); |
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} |
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return $values; |
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} |
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/** |
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* Upserts an entity's attributes with those given. |
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* Stored attributes not given here are pruned. |
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* |
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* @param int $id |
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* @param array $values `[attribute => value]` |
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* @return $this |
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*/ |
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public function save (int $id, array $values) { |
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$this->delete([ |
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$this['entity']->isEqual($id), |
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$this['attribute']->isNotEqual(array_keys($values)) |
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]); |
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$statement = $this->cache(__FUNCTION__, function() { |
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if ($this->db->isSQLite()) { |
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return $this->db->prepare( |
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"INSERT INTO {$this} (entity,attribute,value) VALUES (?,?,?)" |
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. " ON CONFLICT (entity,attribute) DO UPDATE SET value=excluded.value" |
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); |
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} |
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return $this->db->prepare( |
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"INSERT INTO {$this} (entity,attribute,value) VALUES (?,?,?)" |
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. " ON DUPLICATE KEY UPDATE value=VALUES(value)" |
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); |
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}); |
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foreach ($values as $attribute => $value) { |
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$statement->execute([$id, $attribute, $value]); |
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} |
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$statement->closeCursor(); |
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return $this; |
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} |
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/** |
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* @param mixed $value |
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* @return null|scalar |
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*/ |
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protected function setType ($value) { |
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if (isset($value)) { |
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settype($value, $this->valueType); |
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} |
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return $value; |
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} |
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} |
hfw /
db
