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<?php |
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namespace Ivory\Result; |
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use Ivory\Connection\ITypeControl; |
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use Ivory\Exception\NotImplementedException; |
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use Ivory\Exception\ResultException; |
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use Ivory\Relation\Column; |
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use Ivory\Relation\FilteredRelation; |
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use Ivory\Relation\IRelation; |
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use Ivory\Relation\ITuple; |
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use Ivory\Relation\ProjectedRelation; |
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use Ivory\Relation\RelationMacros; |
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use Ivory\Relation\RenamedRelation; |
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use Ivory\Relation\Tuple; |
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use Ivory\Type\IType; |
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class QueryResult extends Result implements IQueryResult |
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{ |
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use RelationMacros; |
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private $numRows; |
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/** @var Column[] */ |
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private $columns; |
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/** @var array map: column name => offset of the first column of the name, or {@link Tuple::AMBIGUOUS_COL} */ |
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private $colNameMap; |
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/** @var IType[] */ |
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private $colTypes; |
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/** |
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* @param resource $resultHandler the result, with the internal pointer at the beginning |
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* @param ITypeControl $typeControl |
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* @param string|null $lastNotice last notice captured on the connection |
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*/ |
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public function __construct($resultHandler, ITypeControl $typeControl, string $lastNotice = null) |
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{ |
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parent::__construct($resultHandler, $lastNotice); |
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$this->numRows = $this->fetchNumRows(); |
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$this->initCols($typeControl); |
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} |
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private function fetchNumRows(): int |
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{ |
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$numRows = pg_num_rows($this->handler); |
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if ($numRows >= 0 && $numRows !== null) { // NOTE: besides -1, pg_num_rows() might return NULL on error |
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return $numRows; |
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} else { |
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throw new ResultException('Error retrieving number of rows of the result.'); |
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} |
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} |
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private function initCols(ITypeControl $typeControl) |
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{ |
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$numFields = pg_num_fields($this->handler); |
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if ($numFields < 0 || $numFields === null) { |
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throw new ResultException('Error retrieving number of fields of the result.'); |
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} |
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$this->columns = []; |
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$this->colNameMap = []; |
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$this->colTypes = []; |
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for ($i = 0; $i < $numFields; $i++) { |
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/* NOTE: pg_field_type() cannot be used for simplicity - multiple types of the same name might exist in |
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* different schemas. Thus, the only reasonable way to recognize the types is using their OIDs, |
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* returned by pg_field_type_oid(). Up to some extreme cases, within a given database, the same OID |
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* will always refer to the same data type. |
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*/ |
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$name = pg_field_name($this->handler, $i); |
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if ($name === false || $name === null) { // NOTE: besides false, pg_field_name() might return NULL on error |
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throw new ResultException("Error retrieving name of result column $i."); |
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} |
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if ($name == '?column?') { |
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$name = null; |
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} |
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$typeOid = pg_field_type_oid($this->handler, $i); |
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if ($typeOid === false || $typeOid === null) { // NOTE: besides false, pg_field_type_oid() might return NULL on error |
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throw new ResultException("Error retrieving type OID of result column $i."); |
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} |
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// NOTE: the type dictionary may change during the iterations, so taky a fresh one every time |
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$typeDictionary = $typeControl->getTypeDictionary(); |
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$type = $typeDictionary->requireTypeByOid($typeOid); |
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$this->columns[] = new Column($this, $i, $name, $type); |
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if ($name !== null) { |
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$this->colNameMap[$name] = (isset($this->colNameMap[$name]) ? Tuple::AMBIGUOUS_COL : $i); |
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} |
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$this->colTypes[] = $type; |
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} |
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} |
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//region IRelation |
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public function getColumns() |
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{ |
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return $this->columns; |
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} |
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public function filter($decider): IRelation |
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{ |
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return new FilteredRelation($this, $decider); |
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} |
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public function project($columns): IRelation |
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{ |
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return new ProjectedRelation($this, $columns); |
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} |
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public function rename($renamePairs): IRelation |
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{ |
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return new RenamedRelation($this, $renamePairs); |
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} |
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public function uniq($hasher = null, $comparator = null): IRelation |
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{ |
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throw new NotImplementedException(); |
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} |
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public function tuple(int $offset = 0): ITuple |
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{ |
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if ($offset >= 0) { |
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if ($offset >= $this->numRows) { |
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throw new \OutOfBoundsException("Offset $offset is out of the result bounds [0,{$this->numRows})"); |
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} |
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$rawData = pg_fetch_row($this->handler, $offset); |
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} else { |
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if ($offset < -$this->numRows) { |
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throw new \OutOfBoundsException("Offset $offset is out of the result bounds [0,{$this->numRows})"); |
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} |
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$rawData = pg_fetch_row($this->handler, $this->numRows + $offset); |
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} |
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if ($rawData === false || $rawData === null) { |
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throw new ResultException("Error fetching row at offset $offset"); |
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} |
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$data = []; |
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foreach ($this->colTypes as $i => $type) { |
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$v = $rawData[$i]; |
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$data[$i] = ($v !== null ? $type->parseValue($v) : null); |
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} |
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return new Tuple($data, $this->colNameMap); |
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} |
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//endregion |
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//region \Countable |
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public function count() |
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{ |
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return $this->numRows; |
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} |
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//endregion |
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} |
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ondrej-bouda /
ivory
