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<?php |
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namespace SilverStripe\ORM\Connect; |
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use mysqli_result; |
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use mysqli_stmt; |
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/** |
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* Provides a record-view for mysqli statements |
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* |
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* By default streams unbuffered data, but seek(), rewind(), or numRecords() will force the statement to |
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* buffer itself and sacrifice any potential performance benefit. |
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*/ |
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class MySQLStatement extends Query |
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{ |
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/** |
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* The related mysqli statement object if generated using a prepared query |
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* |
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* @var mysqli_stmt |
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*/ |
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protected $statement; |
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/** |
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* Metadata result for this statement |
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* |
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* @var mysqli_result |
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*/ |
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protected $metadata; |
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/** |
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* Is the statement bound to the current resultset? |
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* |
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* @var bool |
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*/ |
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protected $bound = false; |
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/** |
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* List of column names |
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* |
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* @var array |
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*/ |
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protected $columns = array(); |
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/** |
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* List of bound variables in the current row |
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* |
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* @var array |
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*/ |
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protected $boundValues = array(); |
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/** |
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* Hook the result-set given into a Query class, suitable for use by SilverStripe. |
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* @param mysqli_stmt $statement The related statement, if present |
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* @param mysqli_result $metadata The metadata for this statement |
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*/ |
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public function __construct($statement, $metadata) |
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{ |
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$this->statement = $statement; |
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$this->metadata = $metadata; |
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// Immediately bind and buffer |
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$this->bind(); |
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} |
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public function __destruct() |
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{ |
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$this->statement->close(); |
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$this->currentRecord = false; |
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} |
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/** |
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* Binds this statement to the variables |
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*/ |
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protected function bind() |
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{ |
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$variables = array(); |
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// Bind each field |
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while ($field = $this->metadata->fetch_field()) { |
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$this->columns[] = $field->name; |
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// Note that while boundValues isn't initialised at this point, |
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// later calls to $this->statement->fetch() Will populate |
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// $this->boundValues later with the next result. |
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$variables[] = &$this->boundValues[$field->name]; |
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} |
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$this->bound = true; |
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$this->metadata->free(); |
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// Buffer all results |
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$this->statement->store_result(); |
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call_user_func_array(array($this->statement, 'bind_result'), $variables); |
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} |
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public function getIterator() |
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{ |
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while ($this->statement->fetch()) { |
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// Dereferenced row |
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$row = array(); |
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foreach ($this->boundValues as $key => $value) { |
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$row[$key] = $value; |
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} |
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yield $row; |
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} |
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} |
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public function numRecords() |
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{ |
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return $this->statement->num_rows(); |
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} |
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} |
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silverstripe /
silverstripe-framework
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