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<?php |
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/** |
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* components |
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* |
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* @author Wolfy-J |
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*/ |
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namespace Spiral\Database\Schemas\Prototypes; |
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use Spiral\Database\Entities\Driver; |
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use Spiral\Database\Schemas\IndexInterface; |
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/** |
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* Abstract index schema with read (see IndexInterface) and write abilities. Must be implemented |
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* by driver to support DBMS specific syntax and creation rules. |
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*/ |
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abstract class AbstractIndex extends AbstractElement implements IndexInterface |
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{ |
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/** |
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* Index types. |
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*/ |
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const NORMAL = 'INDEX'; |
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const UNIQUE = 'UNIQUE'; |
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/** |
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* Index type, by default NORMAL and UNIQUE indexes supported, additional types can be |
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* implemented on database driver level. |
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* |
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* @var string |
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*/ |
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protected $type = self::NORMAL; |
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/** |
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* Columns used to form index. |
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* |
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* @var array |
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*/ |
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protected $columns = []; |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getName(): string |
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{ |
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if (empty($this->name)) { |
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//Let's generate index name on a fly |
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$this->setName($this->generateName()); |
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} |
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return parent::getName(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function isUnique(): bool |
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{ |
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return $this->type == self::UNIQUE; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getColumns(): array |
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{ |
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return $this->columns; |
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} |
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//--MODIFICATIONS |
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/** |
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* Index sql creation syntax. |
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* |
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* @param Driver $driver |
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* @param bool $includeTable Include table ON statement (not required for inline index |
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* creation). |
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* |
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* @return string |
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*/ |
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public function sqlStatement(Driver $driver, bool $includeTable = true): string |
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{ |
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$statement = [$this->type == self::UNIQUE ? 'UNIQUE INDEX' : 'INDEX']; |
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$statement[] = $driver->identifier($this->name); |
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if ($includeTable) { |
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$statement[] = "ON {$driver->identifier($this->table)}"; |
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} |
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//Wrapping column names |
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$columns = implode(', ', array_map([$driver, 'identifier'], $this->columns)); |
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$statement[] = "({$columns})"; |
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return implode(' ', $statement); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function compare(IndexInterface $initial): bool |
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{ |
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return $this == clone $initial; |
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} |
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/** |
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* Generate unique index name. |
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* |
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* @return string |
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*/ |
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protected function generateName(): string |
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{ |
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//We can generate name |
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$name = $this->table . '_index_' . implode('_', $this->columns) . '_' . uniqid(); |
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if (strlen($name) > 64) { |
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//Many dbs has limitations on identifier length |
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$name = md5($name); |
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} |
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return $name; |
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} |
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} |
spiral /
components
