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b3ff31ec0e
Matches name in amphp/mysql.
172 lines
4.5 KiB
PHP
172 lines
4.5 KiB
PHP
<?php
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namespace Amp\Postgres;
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use Amp\Promise;
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use Amp\Success;
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class PgSqlResultSet implements ResultSet {
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/** @var resource PostgreSQL result resource. */
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private $handle;
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/** @var int */
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private $position = 0;
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/** @var mixed Last row emitted. */
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private $currentRow;
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/** @var int Next row fetch type. */
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private $type = self::FETCH_ASSOC;
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/**
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* @param resource $handle PostgreSQL result resource.
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*/
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public function __construct($handle) {
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$this->handle = $handle;
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$this->numRows = \pg_num_rows($this->handle);
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}
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/**
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* Frees the result resource.
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*/
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public function __destruct() {
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\pg_free_result($this->handle);
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}
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/**
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* {@inheritdoc}
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*/
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public function advance(int $type = self::FETCH_ASSOC): Promise {
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$this->currentRow = null;
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$this->type = $type;
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if (++$this->position > \pg_num_rows($this->handle)) {
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return new Success(false);
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}
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return new Success(true);
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}
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/**
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* {@inheritdoc}
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*/
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public function getCurrent() {
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if ($this->currentRow !== null) {
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return $this->currentRow;
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}
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if ($this->position > \pg_num_rows($this->handle)) {
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throw new \Error("No more rows remain in the result set");
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}
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switch ($this->type) {
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case self::FETCH_ASSOC:
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$result = \pg_fetch_array($this->handle, null, \PGSQL_ASSOC);
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break;
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case self::FETCH_ARRAY:
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$result = \pg_fetch_array($this->handle, null, \PGSQL_NUM);
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break;
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case self::FETCH_OBJECT:
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$result = \pg_fetch_object($this->handle);
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break;
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default:
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throw new \Error("Invalid result fetch type");
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}
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if ($result === false) {
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$message = \pg_result_error($this->handle);
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\pg_free_result($this->handle);
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throw new FailureException($message);
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}
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return $this->currentRow = $result;
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}
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/**
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* @return int Number of rows in the result set.
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*/
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public function numRows(): int {
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return \pg_num_rows($this->handle);
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}
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/**
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* @return int Number of fields in each row.
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*/
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public function numFields(): int {
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return \pg_num_fields($this->handle);
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}
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/**
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* @param int $fieldNum
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*
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* @return string Column name at index $fieldNum
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*
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* @throws \Error If the field number does not exist in the result.
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*/
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public function fieldName(int $fieldNum): string {
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return \pg_field_name($this->handle, $this->filterNameOrNum($fieldNum));
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}
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/**
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* @param string $fieldName
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*
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* @return int Index of field with given name.
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*
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* @throws \Error If the field name does not exist in the result.
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*/
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public function fieldNum(string $fieldName): int {
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$result = \pg_field_num($this->handle, $fieldName);
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if (-1 === $result) {
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throw new \Error(\sprintf('No field with name "%s" in result', $fieldName));
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}
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return $result;
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}
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/**
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* @param int|string $fieldNameOrNum Field name or index.
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*
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* @return string Name of the field type.
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*
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* @throws \Error If the field number does not exist in the result.
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*/
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public function fieldType($fieldNameOrNum): string {
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return \pg_field_type($this->handle, $this->filterNameOrNum($fieldNameOrNum));
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}
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/**
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* @param int|string $fieldNameOrNum Field name or index.
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*
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* @return int Storage required for field. -1 indicates a variable length field.
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*
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* @throws \Error If the field number does not exist in the result.
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*/
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public function fieldSize($fieldNameOrNum): int {
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return \pg_field_size($this->handle, $this->filterNameOrNum($fieldNameOrNum));
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}
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/**
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* @param int|string $fieldNameOrNum Field name or index.
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*
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* @return int Field index.
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*
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* @throws \Error
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*/
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private function filterNameOrNum($fieldNameOrNum): int {
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if (\is_string($fieldNameOrNum)) {
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return $this->fieldNum($fieldNameOrNum);
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}
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if (!\is_int($fieldNameOrNum)) {
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throw new \Error('Must provide a string name or integer field number');
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}
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if (0 > $fieldNameOrNum || $this->numFields() <= $fieldNameOrNum) {
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throw new \Error(\sprintf('No field with index %d in result', $fieldNameOrNum));
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}
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return $fieldNameOrNum;
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}
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}
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