mirror of
https://github.com/osm-search/Nominatim.git
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361 lines
11 KiB
PHP
361 lines
11 KiB
PHP
<?php
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/**
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* SPDX-License-Identifier: GPL-2.0-only
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*
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* This file is part of Nominatim. (https://nominatim.org)
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*
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* Copyright (C) 2022 by the Nominatim developer community.
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* For a full list of authors see the git log.
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*/
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namespace Nominatim;
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require_once(CONST_LibDir.'/DatabaseError.php');
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/**
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* Uses PDO to access the database specified in the CONST_Database_DSN
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* setting.
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*/
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class DB
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{
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protected $connection;
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public function __construct($sDSN = null)
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{
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$this->sDSN = $sDSN ?? getSetting('DATABASE_DSN');
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}
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public function connect($bNew = false, $bPersistent = true)
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{
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if (isset($this->connection) && !$bNew) {
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return true;
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}
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$aConnOptions = array(
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\PDO::ATTR_ERRMODE => \PDO::ERRMODE_EXCEPTION,
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\PDO::ATTR_DEFAULT_FETCH_MODE => \PDO::FETCH_ASSOC,
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\PDO::ATTR_PERSISTENT => $bPersistent
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);
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// https://secure.php.net/manual/en/ref.pdo-pgsql.connection.php
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try {
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$conn = new \PDO($this->sDSN, null, null, $aConnOptions);
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} catch (\PDOException $e) {
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$sMsg = 'Failed to establish database connection:' . $e->getMessage();
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throw new \Nominatim\DatabaseError($sMsg, 500, null, $e->getMessage());
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}
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$conn->exec("SET DateStyle TO 'sql,european'");
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$conn->exec("SET client_encoding TO 'utf-8'");
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// Disable JIT and parallel workers. They interfere badly with search SQL.
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$conn->exec("UPDATE pg_settings SET setting = -1 WHERE name = 'jit_above_cost'");
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$conn->exec("UPDATE pg_settings SET setting = 0 WHERE name = 'max_parallel_workers_per_gather'");
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$iMaxExecution = ini_get('max_execution_time');
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if ($iMaxExecution > 0) {
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$conn->setAttribute(\PDO::ATTR_TIMEOUT, $iMaxExecution); // seconds
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}
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$this->connection = $conn;
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return true;
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}
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// returns the number of rows that were modified or deleted by the SQL
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// statement. If no rows were affected returns 0.
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public function exec($sSQL, $aInputVars = null, $sErrMessage = 'Database query failed')
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{
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$val = null;
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try {
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if (isset($aInputVars)) {
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$stmt = $this->connection->prepare($sSQL);
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$stmt->execute($aInputVars);
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} else {
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$val = $this->connection->exec($sSQL);
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}
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} catch (\PDOException $e) {
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throw new \Nominatim\DatabaseError($sErrMessage, 500, null, $e, $sSQL);
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}
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return $val;
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}
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/**
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* Executes query. Returns first row as array.
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* Returns false if no result found.
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*
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* @param string $sSQL
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*
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* @return array[]
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*/
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public function getRow($sSQL, $aInputVars = null, $sErrMessage = 'Database query failed')
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{
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try {
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$stmt = $this->getQueryStatement($sSQL, $aInputVars, $sErrMessage);
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$row = $stmt->fetch();
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} catch (\PDOException $e) {
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throw new \Nominatim\DatabaseError($sErrMessage, 500, null, $e, $sSQL);
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}
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return $row;
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}
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/**
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* Executes query. Returns first value of first result.
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* Returns false if no results found.
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*
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* @param string $sSQL
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*
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* @return array[]
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*/
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public function getOne($sSQL, $aInputVars = null, $sErrMessage = 'Database query failed')
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{
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try {
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$stmt = $this->getQueryStatement($sSQL, $aInputVars, $sErrMessage);
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$row = $stmt->fetch(\PDO::FETCH_NUM);
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if ($row === false) {
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return false;
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}
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} catch (\PDOException $e) {
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throw new \Nominatim\DatabaseError($sErrMessage, 500, null, $e, $sSQL);
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}
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return $row[0];
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}
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/**
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* Executes query. Returns array of results (arrays).
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* Returns empty array if no results found.
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*
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* @param string $sSQL
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*
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* @return array[]
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*/
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public function getAll($sSQL, $aInputVars = null, $sErrMessage = 'Database query failed')
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{
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try {
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$stmt = $this->getQueryStatement($sSQL, $aInputVars, $sErrMessage);
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$rows = $stmt->fetchAll();
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} catch (\PDOException $e) {
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throw new \Nominatim\DatabaseError($sErrMessage, 500, null, $e, $sSQL);
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}
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return $rows;
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}
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/**
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* Executes query. Returns array of the first value of each result.
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* Returns empty array if no results found.
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*
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* @param string $sSQL
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*
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* @return array[]
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*/
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public function getCol($sSQL, $aInputVars = null, $sErrMessage = 'Database query failed')
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{
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$aVals = array();
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try {
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$stmt = $this->getQueryStatement($sSQL, $aInputVars, $sErrMessage);
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while (($val = $stmt->fetchColumn(0)) !== false) { // returns first column or false
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$aVals[] = $val;
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}
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} catch (\PDOException $e) {
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throw new \Nominatim\DatabaseError($sErrMessage, 500, null, $e, $sSQL);
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}
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return $aVals;
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}
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/**
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* Executes query. Returns associate array mapping first value to second value of each result.
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* Returns empty array if no results found.
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*
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* @param string $sSQL
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*
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* @return array[]
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*/
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public function getAssoc($sSQL, $aInputVars = null, $sErrMessage = 'Database query failed')
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{
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try {
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$stmt = $this->getQueryStatement($sSQL, $aInputVars, $sErrMessage);
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$aList = array();
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while ($aRow = $stmt->fetch(\PDO::FETCH_NUM)) {
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$aList[$aRow[0]] = $aRow[1];
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}
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} catch (\PDOException $e) {
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throw new \Nominatim\DatabaseError($sErrMessage, 500, null, $e, $sSQL);
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}
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return $aList;
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}
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/**
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* Executes query. Returns a PDO statement to iterate over.
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*
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* @param string $sSQL
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*
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* @return PDOStatement
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*/
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public function getQueryStatement($sSQL, $aInputVars = null, $sErrMessage = 'Database query failed')
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{
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try {
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if (isset($aInputVars)) {
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$stmt = $this->connection->prepare($sSQL);
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$stmt->execute($aInputVars);
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} else {
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$stmt = $this->connection->query($sSQL);
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}
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} catch (\PDOException $e) {
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throw new \Nominatim\DatabaseError($sErrMessage, 500, null, $e, $sSQL);
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}
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return $stmt;
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}
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/**
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* St. John's Way => 'St. John\'s Way'
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*
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* @param string $sVal Text to be quoted.
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*
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* @return string
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*/
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public function getDBQuoted($sVal)
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{
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return $this->connection->quote($sVal);
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}
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/**
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* Like getDBQuoted, but takes an array.
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*
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* @param array $aVals List of text to be quoted.
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*
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* @return array[]
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*/
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public function getDBQuotedList($aVals)
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{
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return array_map(function ($sVal) {
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return $this->getDBQuoted($sVal);
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}, $aVals);
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}
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/**
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* [1,2,'b'] => 'ARRAY[1,2,'b']''
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*
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* @param array $aVals List of text to be quoted.
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*
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* @return string
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*/
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public function getArraySQL($a)
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{
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return 'ARRAY['.join(',', $a).']';
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}
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/**
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* Check if a table exists in the database. Returns true if it does.
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*
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* @param string $sTableName
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*
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* @return boolean
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*/
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public function tableExists($sTableName)
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{
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$sSQL = 'SELECT count(*) FROM pg_tables WHERE tablename = :tablename';
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return ($this->getOne($sSQL, array(':tablename' => $sTableName)) == 1);
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}
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/**
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* Deletes a table. Returns true if deleted or didn't exist.
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*
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* @param string $sTableName
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*
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* @return boolean
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*/
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public function deleteTable($sTableName)
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{
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return $this->exec('DROP TABLE IF EXISTS '.$sTableName.' CASCADE') == 0;
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}
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/**
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* Tries to connect to the database but on failure doesn't throw an exception.
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*
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* @return boolean
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*/
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public function checkConnection()
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{
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$bExists = true;
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try {
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$this->connect(true);
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} catch (\Nominatim\DatabaseError $e) {
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$bExists = false;
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}
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return $bExists;
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}
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/**
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* e.g. 9.6, 10, 11.2
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*
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* @return float
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*/
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public function getPostgresVersion()
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{
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$sVersionString = $this->getOne('SHOW server_version_num');
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preg_match('#([0-9]?[0-9])([0-9][0-9])[0-9][0-9]#', $sVersionString, $aMatches);
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return (float) ($aMatches[1].'.'.$aMatches[2]);
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}
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/**
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* e.g. 2, 2.2
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*
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* @return float
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*/
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public function getPostgisVersion()
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{
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$sVersionString = $this->getOne('select postgis_lib_version()');
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preg_match('#^([0-9]+)[.]([0-9]+)[.]#', $sVersionString, $aMatches);
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return (float) ($aMatches[1].'.'.$aMatches[2]);
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}
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/**
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* Returns an associate array of postgresql database connection settings. Keys can
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* be 'database', 'hostspec', 'port', 'username', 'password'.
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* Returns empty array on failure, thus check if at least 'database' is set.
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*
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* @return array[]
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*/
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public static function parseDSN($sDSN)
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{
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// https://secure.php.net/manual/en/ref.pdo-pgsql.connection.php
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$aInfo = array();
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if (preg_match('/^pgsql:(.+)$/', $sDSN, $aMatches)) {
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foreach (explode(';', $aMatches[1]) as $sKeyVal) {
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list($sKey, $sVal) = explode('=', $sKeyVal, 2);
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if ($sKey == 'host') {
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$sKey = 'hostspec';
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} elseif ($sKey == 'dbname') {
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$sKey = 'database';
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} elseif ($sKey == 'user') {
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$sKey = 'username';
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}
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$aInfo[$sKey] = $sVal;
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}
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}
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return $aInfo;
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}
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/**
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* Takes an array of settings and return the DNS string. Key names can be
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* 'database', 'hostspec', 'port', 'username', 'password' but aliases
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* 'dbname', 'host' and 'user' are also supported.
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*
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* @return string
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*
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*/
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public static function generateDSN($aInfo)
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{
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$sDSN = sprintf(
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'pgsql:host=%s;port=%s;dbname=%s;user=%s;password=%s;',
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$aInfo['host'] ?? $aInfo['hostspec'] ?? '',
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$aInfo['port'] ?? '',
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$aInfo['dbname'] ?? $aInfo['database'] ?? '',
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$aInfo['user'] ?? '',
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$aInfo['password'] ?? ''
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);
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$sDSN = preg_replace('/\b\w+=;/', '', $sDSN);
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$sDSN = preg_replace('/;\Z/', '', $sDSN);
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return $sDSN;
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}
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}
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