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<?php
/**
* This file is part of the Dibi, smart database abstraction layer (https://dibiphp.com)
* Copyright (c) 2005 David Grudl (https://davidgrudl.com)
*/
declare(strict_types=1);
namespace Dibi\Drivers;
use Dibi;
/**
* The driver for MySQL database.
*
* Driver options:
* - host => the MySQL server host name
* - port (int) => the port number to attempt to connect to the MySQL server
* - socket => the socket or named pipe
* - username (or user)
* - password (or pass)
* - database => the database name to select
* - options (array) => array of driver specific constants (MYSQLI_*) and values {@see mysqli_options}
* - flags (int) => driver specific constants (MYSQLI_CLIENT_*) {@see mysqli_real_connect}
* - charset => character encoding to set (default is utf8)
* - persistent (bool) => try to find a persistent link?
* - unbuffered (bool) => sends query without fetching and buffering the result rows automatically?
* - sqlmode => see http://dev.mysql.com/doc/refman/5.0/en/server-sql-mode.html
* - resource (mysqli) => existing connection resource
*/
class MySqliDriver implements Dibi\Driver
{
use Dibi\Strict;
public const ERROR_ACCESS_DENIED = 1045;
public const ERROR_DUPLICATE_ENTRY = 1062;
public const ERROR_DATA_TRUNCATED = 1265;
/** @var \mysqli */
private $connection;
/** @var bool Is buffered (seekable and countable)? */
private $buffered;
/** @throws Dibi\NotSupportedException */
public function __construct(array $config)
{
if (!extension_loaded('mysqli')) {
throw new Dibi\NotSupportedException("PHP extension 'mysqli' is not loaded.");
}
mysqli_report(MYSQLI_REPORT_OFF);
if (isset($config['resource']) && $config['resource'] instanceof \mysqli) {
$this->connection = $config['resource'];
} else {
// default values
$config += [
'charset' => 'utf8',
'timezone' => date('P'),
'username' => ini_get('mysqli.default_user'),
'password' => ini_get('mysqli.default_pw'),
'socket' => (string) ini_get('mysqli.default_socket'),
'port' => null,
];
if (!isset($config['host'])) {
$host = ini_get('mysqli.default_host');
if ($host) {
$config['host'] = $host;
$config['port'] = (int) ini_get('mysqli.default_port');
} else {
$config['host'] = null;
$config['port'] = null;
}
}
$foo = &$config['flags'];
$foo = &$config['database'];
$this->connection = mysqli_init();
if (isset($config['options'])) {
foreach ($config['options'] as $key => $value) {
$this->connection->options($key, $value);
}
}
@$this->connection->real_connect( // intentionally @
(empty($config['persistent']) ? '' : 'p:') . $config['host'],
$config['username'],
$config['password'] ?? '',
$config['database'] ?? '',
$config['port'] ?? 0,
$config['socket'],
$config['flags'] ?? 0
);
if ($this->connection->connect_errno) {
throw new Dibi\DriverException($this->connection->connect_error, $this->connection->connect_errno);
}
}
if (isset($config['charset'])) {
if (!@$this->connection->set_charset($config['charset'])) {
$this->query("SET NAMES '$config[charset]'");
}
}
if (isset($config['sqlmode'])) {
$this->query("SET sql_mode='$config[sqlmode]'");
}
if (isset($config['timezone'])) {
$this->query("SET time_zone='$config[timezone]'");
}
$this->buffered = empty($config['unbuffered']);
}
/**
* Disconnects from a database.
*/
public function disconnect(): void
{
@$this->connection->close(); // @ - connection can be already disconnected
}
/**
* Pings a server connection, or tries to reconnect if the connection has gone down.
*/
public function ping(): bool
{
return $this->connection->ping();
}
/**
* Executes the SQL query.
* @throws Dibi\DriverException
*/
public function query(string $sql): ?Dibi\ResultDriver
{
$res = @$this->connection->query($sql, $this->buffered ? MYSQLI_STORE_RESULT : MYSQLI_USE_RESULT); // intentionally @
if ($code = mysqli_errno($this->connection)) {
throw static::createException(mysqli_error($this->connection), $code, $sql);
} elseif ($res instanceof \mysqli_result) {
return $this->createResultDriver($res);
}
return null;
}
/**
* @param int|string $code
*/
public static function createException(string $message, $code, string $sql): Dibi\DriverException
{
if (in_array($code, [1216, 1217, 1451, 1452, 1701], true)) {
return new Dibi\ForeignKeyConstraintViolationException($message, $code, $sql);
} elseif (in_array($code, [1062, 1557, 1569, 1586], true)) {
return new Dibi\UniqueConstraintViolationException($message, $code, $sql);
} elseif (in_array($code, [1048, 1121, 1138, 1171, 1252, 1263, 1566], true)) {
return new Dibi\NotNullConstraintViolationException($message, $code, $sql);
} else {
return new Dibi\DriverException($message, $code, $sql);
}
}
/**
* Retrieves information about the most recently executed query.
*/
public function getInfo(): array
{
$res = [];
preg_match_all('#(.+?): +(\d+) *#', $this->connection->info, $matches, PREG_SET_ORDER);
if (preg_last_error()) {
throw new Dibi\PcreException;
}
foreach ($matches as $m) {
$res[$m[1]] = (int) $m[2];
}
return $res;
}
/**
* Gets the number of affected rows by the last INSERT, UPDATE or DELETE query.
*/
public function getAffectedRows(): ?int
{
return $this->connection->affected_rows === -1
? null
: $this->connection->affected_rows;
}
/**
* Retrieves the ID generated for an AUTO_INCREMENT column by the previous INSERT query.
*/
public function getInsertId(?string $sequence): ?int
{
return $this->connection->insert_id ?: null;
}
/**
* Begins a transaction (if supported).
* @throws Dibi\DriverException
*/
public function begin(?string $savepoint = null): void
{
$this->query($savepoint ? "SAVEPOINT $savepoint" : 'START TRANSACTION');
}
/**
* Commits statements in a transaction.
* @throws Dibi\DriverException
*/
public function commit(?string $savepoint = null): void
{
$this->query($savepoint ? "RELEASE SAVEPOINT $savepoint" : 'COMMIT');
}
/**
* Rollback changes in a transaction.
* @throws Dibi\DriverException
*/
public function rollback(?string $savepoint = null): void
{
$this->query($savepoint ? "ROLLBACK TO SAVEPOINT $savepoint" : 'ROLLBACK');
}
/**
* Returns the connection resource.
*/
public function getResource(): ?\mysqli
{
try {
return @$this->connection->thread_id ? $this->connection : null;
} catch (\Throwable $e) {
return null;
}
}
/**
* Returns the connection reflector.
*/
public function getReflector(): Dibi\Reflector
{
return new MySqlReflector($this);
}
/**
* Result set driver factory.
*/
public function createResultDriver(\mysqli_result $result): MySqliResult
{
return new MySqliResult($result, $this->buffered);
}
/********************* SQL ****************d*g**/
/**
* Encodes data for use in a SQL statement.
*/
public function escapeText(string $value): string
{
return "'" . $this->connection->escape_string($value) . "'";
}
public function escapeBinary(string $value): string
{
return "_binary'" . $this->connection->escape_string($value) . "'";
}
public function escapeIdentifier(string $value): string
{
return '`' . str_replace('`', '``', $value) . '`';
}
public function escapeBool(bool $value): string
{
return $value ? '1' : '0';
}
public function escapeDate(\DateTimeInterface $value): string
{
return $value->format("'Y-m-d'");
}
public function escapeDateTime(\DateTimeInterface $value): string
{
return $value->format("'Y-m-d H:i:s.u'");
}
public function escapeDateInterval(\DateInterval $value): string
{
if ($value->y || $value->m || $value->d) {
throw new Dibi\NotSupportedException('Only time interval is supported.');
}
return $value->format("'%r%H:%I:%S.%f'");
}
/**
* Encodes string for use in a LIKE statement.
*/
public function escapeLike(string $value, int $pos): string
{
$value = addcslashes(str_replace('\\', '\\\\', $value), "\x00\n\r\\'%_");
return ($pos & 1 ? "'%" : "'") . $value . ($pos & 2 ? "%'" : "'");
}
/**
* Injects LIMIT/OFFSET to the SQL query.
*/
public function applyLimit(string &$sql, ?int $limit, ?int $offset): void
{
if ($limit < 0 || $offset < 0) {
throw new Dibi\NotSupportedException('Negative offset or limit.');
} elseif ($limit !== null || $offset) {
// see http://dev.mysql.com/doc/refman/5.0/en/select.html
$sql .= ' LIMIT ' . ($limit ?? '18446744073709551615')
. ($offset ? ' OFFSET ' . $offset : '');
}
}
}
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