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<?php |
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/** |
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* Spiral Framework. |
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* |
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* @license MIT |
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* @author Anton Titov (Wolfy-J) |
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*/ |
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namespace Spiral\Database\Schemas; |
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use Spiral\Database\Schemas\Prototypes\AbstractElement; |
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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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* @param bool $quoted Quote name. |
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*/ |
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public function getName($quoted = false) |
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{ |
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if (empty(parent::getName())) { |
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$this->setName($this->generateName()); |
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} |
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return parent::getName($quoted); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function isUnique() |
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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() |
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{ |
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return $this->columns; |
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} |
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/** |
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* Change index type and behaviour to unique/non-unique state. |
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* |
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* @param bool $unique |
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* |
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* @return $this |
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*/ |
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public function unique($unique = true) |
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{ |
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$this->type = $unique ? self::UNIQUE : self::NORMAL; |
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return $this; |
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} |
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/** |
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* Change set of index forming columns. Method must support both array and string parameters. |
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* |
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* Example: |
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* $index->columns('key'); |
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* $index->columns('key', 'key2'); |
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* $index->columns(['key', 'key2']); |
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* |
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* @param string|array $columns Columns array or comma separated list of parameters. |
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* |
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* @return $this |
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*/ |
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public function columns($columns) |
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{ |
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if (!is_array($columns)) { |
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$columns = func_get_args(); |
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} |
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$this->columns = $columns; |
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return $this; |
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} |
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/** |
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* Index sql creation syntax. |
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* |
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* @param bool $includeTable Include table ON statement (not required for inline index |
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* creation). |
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* |
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* @return string |
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*/ |
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public function sqlStatement($includeTable = true) |
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{ |
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$statement = [$this->type]; |
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if ($this->isUnique()) { |
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//UNIQUE INDEX |
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$statement[] = 'INDEX'; |
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} |
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$statement[] = $this->getName(true); |
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if ($includeTable) { |
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$statement[] = "ON {$this->table->getName(true)}"; |
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} |
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//Wrapping column names |
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$columns = implode(', ', array_map( |
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[$this->table->driver(), 'identifier'] |
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, $this->columns |
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)); |
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$statement[] = "({$columns})"; |
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return implode(' ', $statement); |
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} |
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/** |
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* Compare two elements together. |
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* |
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* @param self $initial |
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* |
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* @return bool |
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*/ |
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public function compare(self $initial) |
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{ |
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$normalized = clone $initial; |
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$normalized->declared = $this->declared; |
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return $this == $normalized; |
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} |
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/** |
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* Generate unique index name. |
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* |
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* @return string |
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*/ |
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protected function generateName() |
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{ |
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//We can generate name |
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$name = $this->table->getName() . '_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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} |
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spiral /
components
