<?php
/*
* OIDplus 2.0
* Copyright 2019 Daniel Marschall, ViaThinkSoft
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
class OIDplusDatabaseConnectionPDO extends OIDplusDatabaseConnection {
private $conn = null;
private $last_error = null; // we need that because PDO divides prepared statement errors and normal query errors, but we have only one "error()" method
private $transactions_supported = false;
public static function getPlugin(): OIDplusDatabasePlugin {
return new OIDplusDatabasePluginPDO();
}
public function doQuery(string $sql, /*?array*/ $prepared_args=null): OIDplusQueryResult {
$this->last_error = null;
$res = $this->conn->query($sql);
if ($res === false) {
$this->last_error = $this->conn->errorInfo()[2];
throw new OIDplusSQLException($sql, $this->error());
} else {
return new OIDplusQueryResultPDO($res);
}
} else {
throw new OIDplusException(_L('"prepared_args" must be either NULL or an ARRAY.'));
}
/*
// Not required because PDO can emulate prepared statements by itself
if ($this->forcePrepareEmulation()) {
$sql = str_replace('?', chr(1), $sql);
foreach ($prepared_args as $arg) {
$needle = chr(1);
if (is_bool($arg)) {
if ($this->slangDetectionDone) {
$replace = $this->getSlang()->getSQLBool($arg);
} else {
$replace = $arg ? '1' : '0';
}
} else {
$replace = "'$arg'"; // TODO: types
}
$pos = strpos($sql, $needle);
if ($pos !== false) {
$sql = substr_replace($sql, $replace, $pos, strlen($needle));
}
}
$sql = str_replace(chr(1), '?', $sql);
$ps = $this->conn->query($sql);
if (!$ps) {
$this->last_error = $this->error();
throw new OIDplusSQLException($sql, _L('Cannot prepare statement').': '.$this->error());
}
return new OIDplusQueryResultPDO($ps);
}
*/
foreach ($prepared_args as &$value) {
// We need to manually convert booleans into strings, because there is a
// 14 year old bug that hasn't been adressed by the PDO developers:
// https://bugs.php.net/bug.php?id=57157
if ($this->slangDetectionDone) {
$value = $this->getSlang()->getSQLBool($value);
} else {
// This works for everything except Microsoft Access (which needs -1 and 0)
// Note: We are using '1' and '0' instead of 'true' and 'false' because MySQL converts boolean to tinyint(1)
$value = $value ? '1' : '0';
}
}
}
$ps = $this->conn->prepare($sql);
if (!$ps) {
$this->last_error = $this->conn->errorInfo()[2];
throw new OIDplusSQLException($sql, _L('Cannot prepare statement').': '.$this->error());
}
if (!$ps->execute($prepared_args)) {
$this->last_error = $ps->errorInfo()[2];
throw new OIDplusSQLException($sql, $this->error());
}
return new OIDplusQueryResultPDO($ps);
}
}
public function insert_id(): int {
try {
$out = @($this->conn->lastInsertId());
if ($out === false) return parent::insert_id(); // fallback method that uses the SQL slang
return $out;
} catch (Exception $e) {
return parent::insert_id(); // fallback method that uses the SQL slang
}
}
public function error(): string {
$err = $this->last_error;
if ($err == null) $err = '';
return $err;
}
protected function doConnect()/*: void*/ {
if (!class_exists('PDO')) throw new OIDplusConfigInitializationException
(_L
('PHP extension "%1" not installed','PDO'));
try {
$options = [
PDO::ATTR_ERRMODE => PDO::ERRMODE_SILENT,
PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
PDO::ATTR_EMULATE_PREPARES => true,
];
// Try connecting to the database
$dsn = OIDplus::baseConfig()->getValue('PDO_DSN', 'mysql:host=localhost;dbname=oidplus;CHARSET=UTF8');
$username = OIDplus::baseConfig()->getValue('PDO_USERNAME', 'root');
$password = OIDplus::baseConfig()->getValue('PDO_PASSWORD', '');
$this->conn = new PDO($dsn, $username, $password, $options);
} catch (PDOException $e) {
$message = $e->getMessage();
throw new OIDplusConfigInitializationException(_L('Connection to the database failed!').' '.$message);
}
$this->last_error = null;
try {
@$this->conn->exec("SET NAMES 'utf8'"); } catch (Exception $e) {
}
// We check if the DBMS supports autocommit.
// Attention: Check it after you have sent a query already, because Microsoft Access doesn't seem to allow
// changing auto commit once a query was executed ("Attribute cannot be set now SQLState: S1011")
// Note: For some weird reason we *DO* need to redirect the output to "$dummy", otherwise it won't work!
$dummy = $this->conn->query("select name from config where 1=0");
try {
$this->conn->beginTransaction();
$this->conn->rollBack();
$this->transactions_supported = true;
} catch (Exception $e) {
$this->transactions_supported = false;
}
}
protected function doDisconnect()/*: void*/ {
$this->conn = null; // the connection will be closed by removing the reference
}
private $intransaction = false;
public function transaction_supported(): bool {
return $this->transactions_supported;
}
public function transaction_level(): int {
if (!$this->transaction_supported()) {
// TODO?
return 0;
}
return $this->intransaction ? 1 : 0;
}
public function transaction_begin()/*: void*/ {
if (!$this->transaction_supported()) {
// TODO?
return;
}
if ($this->intransaction) throw new OIDplusException(_L('Nested transactions are not supported by this database plugin.'));
$this->conn->beginTransaction();
$this->intransaction = true;
}
public function transaction_commit()/*: void*/ {
if (!$this->transaction_supported()) {
// TODO?
return;
}
$this->conn->commit();
$this->intransaction = false;
}
public function transaction_rollback()/*: void*/ {
if (!$this->transaction_supported()) {
// TODO?
return;
}
$this->conn->rollBack();
$this->intransaction = false;
}
}