src/Database/Database.php

   1 <?php
   2
   3 namespace Friendica\Database;
   4
   5 use Friendica\Core\Config\Cache\ConfigCache;
   6 use Friendica\Core\System;
   7 use Friendica\Network\HTTPException\InternalServerErrorException;
   8 use Friendica\Util\DateTimeFormat;
   9 use Friendica\Util\Profiler;
  10 use mysqli;
  11 use mysqli_result;
  12 use mysqli_stmt;
  13 use PDO;
  14 use PDOException;
  15 use PDOStatement;
  16 use Psr\Log\LoggerInterface;
  17
  18 /**
  19  * @class MySQL database class
  20  *
  21  * This class is for the low level database stuff that does driver specific things.
  22  */
  23 class Database
  24 {
  25         protected $connected = false;
  26
  27         /**
  28          * @var ConfigCache
  29          */
  30         protected $configCache;
  31         /**
  32          * @var Profiler
  33          */
  34         protected $profiler;
  35         /**
  36          * @var LoggerInterface
  37          */
  38         protected $logger;
  39         protected $server_info    = '';
  40         /** @var PDO|mysqli */
  41         protected $connection;
  42         protected $driver;
  43         private $error          = false;
  44         private $errorno        = 0;
  45         private $affected_rows  = 0;
  46         protected $in_transaction = false;
  47         protected $in_retrial     = false;
  48         private $relation       = [];
  49
  50         public function __construct(ConfigCache $configCache, Profiler $profiler, LoggerInterface $logger, array $server = [])
  51         {
  52                 // We are storing these values for being able to perform a reconnect
  53                 $this->configCache   = $configCache;
  54                 $this->profiler      = $profiler;
  55                 $this->logger        = $logger;
  56
  57                 $this->readServerVariables($server);
  58                 $this->connect();
  59
  60                 if ($this->isConnected()) {
  61                         // Loads DB_UPDATE_VERSION constant
  62                         DBStructure::definition($configCache->get('system', 'basepath'), false);
  63                 }
  64         }
  65
  66         private function readServerVariables(array $server)
  67         {
  68                 // Use environment variables for mysql if they are set beforehand
  69                 if (!empty($server['MYSQL_HOST'])
  70                     && (!empty($server['MYSQL_USERNAME'] || !empty($server['MYSQL_USER'])))
  71                     && $server['MYSQL_PASSWORD'] !== false
  72                     && !empty($server['MYSQL_DATABASE']))
  73                 {
  74                         $db_host = $server['MYSQL_HOST'];
  75                         if (!empty($server['MYSQL_PORT'])) {
  76                                 $db_host .= ':' . $server['MYSQL_PORT'];
  77                         }
  78                         $this->configCache->set('database', 'hostname', $db_host);
  79                         unset($db_host);
  80                         if (!empty($server['MYSQL_USERNAME'])) {
  81                                 $this->configCache->set('database', 'username', $server['MYSQL_USERNAME']);
  82                         } else {
  83                                 $this->configCache->set('database', 'username', $server['MYSQL_USER']);
  84                         }
  85                         $this->configCache->set('database', 'password', (string) $server['MYSQL_PASSWORD']);
  86                         $this->configCache->set('database', 'database', $server['MYSQL_DATABASE']);
  87                 }
  88         }
  89
  90         public function connect()
  91         {
  92                 if (!is_null($this->connection) && $this->connected()) {
  93                         return $this->connected;
  94                 }
  95
  96                 // Reset connected state
  97                 $this->connected = false;
  98
  99                 $port       = 0;
 100                 $serveraddr = trim($this->configCache->get('database', 'hostname'));
 101                 $serverdata = explode(':', $serveraddr);
 102                 $server     = $serverdata[0];
 103                 if (count($serverdata) > 1) {
 104                         $port = trim($serverdata[1]);
 105                 }
 106                 $server  = trim($server);
 107                 $user    = trim($this->configCache->get('database', 'username'));
 108                 $pass    = trim($this->configCache->get('database', 'password'));
 109                 $db      = trim($this->configCache->get('database', 'database'));
 110                 $charset = trim($this->configCache->get('database', 'charset'));
 111
 112                 if (!(strlen($server) && strlen($user))) {
 113                         return false;
 114                 }
 115
 116                 if (class_exists('\PDO') && in_array('mysql', PDO::getAvailableDrivers())) {
 117                         $this->driver = 'pdo';
 118                         $connect      = "mysql:host=" . $server . ";dbname=" . $db;
 119
 120                         if ($port > 0) {
 121                                 $connect .= ";port=" . $port;
 122                         }
 123
 124                         if ($charset) {
 125                                 $connect .= ";charset=" . $charset;
 126                         }
 127
 128                         try {
 129                                 $this->connection = @new PDO($connect, $user, $pass);
 130                                 $this->connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
 131                                 $this->connected = true;
 132                         } catch (PDOException $e) {
 133                                 $this->connected = false;
 134                         }
 135                 }
 136
 137                 if (!$this->connected && class_exists('\mysqli')) {
 138                         $this->driver = 'mysqli';
 139
 140                         if ($port > 0) {
 141                                 $this->connection = @new mysqli($server, $user, $pass, $db, $port);
 142                         } else {
 143                                 $this->connection = @new mysqli($server, $user, $pass, $db);
 144                         }
 145
 146                         if (!mysqli_connect_errno()) {
 147                                 $this->connected = true;
 148
 149                                 if ($charset) {
 150                                         $this->connection->set_charset($charset);
 151                                 }
 152                         }
 153                 }
 154
 155                 // No suitable SQL driver was found.
 156                 if (!$this->connected) {
 157                         $this->driver     = null;
 158                         $this->connection = null;
 159                 }
 160
 161                 return $this->connected;
 162         }
 163
 164         /**
 165          * Sets the logger for DBA
 166          *
 167          * @note this is necessary because if we want to load the logger configuration
 168          *       from the DB, but there's an error, we would print out an exception.
 169          *       So the logger gets updated after the logger configuration can be retrieved
 170          *       from the database
 171          *
 172          * @param LoggerInterface $logger
 173          */
 174         public function setLogger(LoggerInterface $logger)
 175         {
 176                 $this->logger = $logger;
 177         }
 178
 179         /**
 180          * Sets the profiler for DBA
 181          *
 182          * @param Profiler $profiler
 183          */
 184         public function setProfiler(Profiler $profiler)
 185         {
 186                 $this->profiler = $profiler;
 187         }
 188         /**
 189          * Disconnects the current database connection
 190          */
 191         public function disconnect()
 192         {
 193                 if (!is_null($this->connection)) {
 194                         switch ($this->driver) {
 195                                 case 'pdo':
 196                                         $this->connection = null;
 197                                         break;
 198                                 case 'mysqli':
 199                                         $this->connection->close();
 200                                         $this->connection = null;
 201                                         break;
 202                         }
 203                 }
 204
 205                 $this->driver    = null;
 206                 $this->connected = false;
 207         }
 208
 209         /**
 210          * Perform a reconnect of an existing database connection
 211          */
 212         public function reconnect()
 213         {
 214                 $this->disconnect();
 215                 return $this->connect();
 216         }
 217
 218         /**
 219          * Return the database object.
 220          *
 221          * @return PDO|mysqli
 222          */
 223         public function getConnection()
 224         {
 225                 return $this->connection;
 226         }
 227
 228         /**
 229          * @brief Returns the MySQL server version string
 230          *
 231          * This function discriminate between the deprecated mysql API and the current
 232          * object-oriented mysqli API. Example of returned string: 5.5.46-0+deb8u1
 233          *
 234          * @return string
 235          */
 236         public function serverInfo()
 237         {
 238                 if ($this->server_info == '') {
 239                         switch ($this->driver) {
 240                                 case 'pdo':
 241                                         $this->server_info = $this->connection->getAttribute(PDO::ATTR_SERVER_VERSION);
 242                                         break;
 243                                 case 'mysqli':
 244                                         $this->server_info = $this->connection->server_info;
 245                                         break;
 246                         }
 247                 }
 248                 return $this->server_info;
 249         }
 250
 251         /**
 252          * @brief Returns the selected database name
 253          *
 254          * @return string
 255          * @throws \Exception
 256          */
 257         public function databaseName()
 258         {
 259                 $ret  = $this->p("SELECT DATABASE() AS `db`");
 260                 $data = $this->toArray($ret);
 261                 return $data[0]['db'];
 262         }
 263
 264         /**
 265          * @brief Analyze a database query and log this if some conditions are met.
 266          *
 267          * @param string $query The database query that will be analyzed
 268          *
 269          * @throws \Exception
 270          */
 271         private function logIndex($query)
 272         {
 273
 274                 if (!$this->configCache->get('system', 'db_log_index')) {
 275                         return;
 276                 }
 277
 278                 // Don't explain an explain statement
 279                 if (strtolower(substr($query, 0, 7)) == "explain") {
 280                         return;
 281                 }
 282
 283                 // Only do the explain on "select", "update" and "delete"
 284                 if (!in_array(strtolower(substr($query, 0, 6)), ["select", "update", "delete"])) {
 285                         return;
 286                 }
 287
 288                 $r = $this->p("EXPLAIN " . $query);
 289                 if (!$this->isResult($r)) {
 290                         return;
 291                 }
 292
 293                 $watchlist = explode(',', $this->configCache->get('system', 'db_log_index_watch'));
 294                 $blacklist = explode(',', $this->configCache->get('system', 'db_log_index_blacklist'));
 295
 296                 while ($row = $this->fetch($r)) {
 297                         if ((intval($this->configCache->get('system', 'db_loglimit_index')) > 0)) {
 298                                 $log = (in_array($row['key'], $watchlist) &&
 299                                         ($row['rows'] >= intval($this->configCache->get('system', 'db_loglimit_index'))));
 300                         } else {
 301                                 $log = false;
 302                         }
 303
 304                         if ((intval($this->configCache->get('system', 'db_loglimit_index_high')) > 0) && ($row['rows'] >= intval($this->configCache->get('system', 'db_loglimit_index_high')))) {
 305                                 $log = true;
 306                         }
 307
 308                         if (in_array($row['key'], $blacklist) || ($row['key'] == "")) {
 309                                 $log = false;
 310                         }
 311
 312                         if ($log) {
 313                                 $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
 314                                 @file_put_contents($this->configCache->get('system', 'db_log_index'), DateTimeFormat::utcNow() . "\t" .
 315                                                                                                       $row['key'] . "\t" . $row['rows'] . "\t" . $row['Extra'] . "\t" .
 316                                                                                                       basename($backtrace[1]["file"]) . "\t" .
 317                                                                                                       $backtrace[1]["line"] . "\t" . $backtrace[2]["function"] . "\t" .
 318                                                                                                       substr($query, 0, 2000) . "\n", FILE_APPEND);
 319                         }
 320                 }
 321         }
 322
 323         /**
 324          * Removes every not whitelisted character from the identifier string
 325          *
 326          * @param string $identifier
 327          *
 328          * @return string sanitized identifier
 329          * @throws \Exception
 330          */
 331         private function sanitizeIdentifier($identifier)
 332         {
 333                 return preg_replace('/[^A-Za-z0-9_\-]+/', '', $identifier);
 334         }
 335
 336         public function escape($str)
 337         {
 338                 if ($this->connected) {
 339                         switch ($this->driver) {
 340                                 case 'pdo':
 341                                         return substr(@$this->connection->quote($str, PDO::PARAM_STR), 1, -1);
 342
 343                                 case 'mysqli':
 344                                         return @$this->connection->real_escape_string($str);
 345                         }
 346                 } else {
 347                         return str_replace("'", "\\'", $str);
 348                 }
 349         }
 350
 351         public function isConnected()
 352         {
 353                 return $this->connected;
 354         }
 355
 356         public function connected()
 357         {
 358                 $connected = false;
 359
 360                 if (is_null($this->connection)) {
 361                         return false;
 362                 }
 363
 364                 switch ($this->driver) {
 365                         case 'pdo':
 366                                 $r = $this->p("SELECT 1");
 367                                 if ($this->isResult($r)) {
 368                                         $row       = $this->toArray($r);
 369                                         $connected = ($row[0]['1'] == '1');
 370                                 }
 371                                 break;
 372                         case 'mysqli':
 373                                 $connected = $this->connection->ping();
 374                                 break;
 375                 }
 376
 377                 return $connected;
 378         }
 379
 380         /**
 381          * @brief Replaces ANY_VALUE() function by MIN() function,
 382          *  if the database server does not support ANY_VALUE().
 383          *
 384          * Considerations for Standard SQL, or MySQL with ONLY_FULL_GROUP_BY (default since 5.7.5).
 385          * ANY_VALUE() is available from MySQL 5.7.5 https://dev.mysql.com/doc/refman/5.7/en/miscellaneous-functions.html
 386          * A standard fall-back is to use MIN().
 387          *
 388          * @param string $sql An SQL string without the values
 389          *
 390          * @return string The input SQL string modified if necessary.
 391          */
 392         public function anyValueFallback($sql)
 393         {
 394                 $server_info = $this->serverInfo();
 395                 if (version_compare($server_info, '5.7.5', '<') ||
 396                     (stripos($server_info, 'MariaDB') !== false)) {
 397                         $sql = str_ireplace('ANY_VALUE(', 'MIN(', $sql);
 398                 }
 399                 return $sql;
 400         }
 401
 402         /**
 403          * @brief Replaces the ? placeholders with the parameters in the $args array
 404          *
 405          * @param string $sql  SQL query
 406          * @param array  $args The parameters that are to replace the ? placeholders
 407          *
 408          * @return string The replaced SQL query
 409          */
 410         private function replaceParameters($sql, $args)
 411         {
 412                 $offset = 0;
 413                 foreach ($args AS $param => $value) {
 414                         if (is_int($args[$param]) || is_float($args[$param])) {
 415                                 $replace = intval($args[$param]);
 416                         } else {
 417                                 $replace = "'" . $this->escape($args[$param]) . "'";
 418                         }
 419
 420                         $pos = strpos($sql, '?', $offset);
 421                         if ($pos !== false) {
 422                                 $sql = substr_replace($sql, $replace, $pos, 1);
 423                         }
 424                         $offset = $pos + strlen($replace);
 425                 }
 426                 return $sql;
 427         }
 428
 429         /**
 430          * @brief Executes a prepared statement that returns data
 431          * @usage Example: $r = p("SELECT * FROM `item` WHERE `guid` = ?", $guid);
 432          *
 433          * Please only use it with complicated queries.
 434          * For all regular queries please use DBA::select or DBA::exists
 435          *
 436          * @param string $sql SQL statement
 437          *
 438          * @return bool|object statement object or result object
 439          * @throws \Exception
 440          */
 441         public function p($sql)
 442         {
 443
 444                 $stamp1 = microtime(true);
 445
 446                 $params = DBA::getParam(func_get_args());
 447
 448                 // Renumber the array keys to be sure that they fit
 449                 $i    = 0;
 450                 $args = [];
 451                 foreach ($params AS $param) {
 452                         // Avoid problems with some MySQL servers and boolean values. See issue #3645
 453                         if (is_bool($param)) {
 454                                 $param = (int)$param;
 455                         }
 456                         $args[++$i] = $param;
 457                 }
 458
 459                 if (!$this->connected) {
 460                         return false;
 461                 }
 462
 463                 if ((substr_count($sql, '?') != count($args)) && (count($args) > 0)) {
 464                         // Question: Should we continue or stop the query here?
 465                         $this->logger->warning('Query parameters mismatch.', ['query' => $sql, 'args' => $args, 'callstack' => System::callstack()]);
 466                 }
 467
 468                 $sql = DBA::cleanQuery($sql);
 469                 $sql = $this->anyValueFallback($sql);
 470
 471                 $orig_sql = $sql;
 472
 473                 if ($this->configCache->get('system', 'db_callstack') !== null) {
 474                         $sql = "/*" . System::callstack() . " */ " . $sql;
 475                 }
 476
 477                 $this->error         = '';
 478                 $this->errorno       = 0;
 479                 $this->affected_rows = 0;
 480
 481                 // We have to make some things different if this function is called from "e"
 482                 $trace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 2);
 483
 484                 if (isset($trace[1])) {
 485                         $called_from = $trace[1];
 486                 } else {
 487                         // We use just something that is defined to avoid warnings
 488                         $called_from = $trace[0];
 489                 }
 490                 // We are having an own error logging in the function "e"
 491                 $called_from_e = ($called_from['function'] == 'e');
 492
 493                 if (!isset($this->connection)) {
 494                         throw new InternalServerErrorException('The Connection is empty, although connected is set true.');
 495                 }
 496
 497                 switch ($this->driver) {
 498                         case 'pdo':
 499                                 // If there are no arguments we use "query"
 500                                 if (count($args) == 0) {
 501                                         if (!$retval = $this->connection->query($sql)) {
 502                                                 $errorInfo     = $this->connection->errorInfo();
 503                                                 $this->error   = $errorInfo[2];
 504                                                 $this->errorno = $errorInfo[1];
 505                                                 $retval        = false;
 506                                                 break;
 507                                         }
 508                                         $this->affected_rows = $retval->rowCount();
 509                                         break;
 510                                 }
 511
 512                                 /** @var $stmt mysqli_stmt|PDOStatement */
 513                                 if (!$stmt = $this->connection->prepare($sql)) {
 514                                         $errorInfo     = $this->connection->errorInfo();
 515                                         $this->error   = $errorInfo[2];
 516                                         $this->errorno = $errorInfo[1];
 517                                         $retval        = false;
 518                                         break;
 519                                 }
 520
 521                                 foreach ($args AS $param => $value) {
 522                                         if (is_int($args[$param])) {
 523                                                 $data_type = PDO::PARAM_INT;
 524                                         } else {
 525                                                 $data_type = PDO::PARAM_STR;
 526                                         }
 527                                         $stmt->bindParam($param, $args[$param], $data_type);
 528                                 }
 529
 530                                 if (!$stmt->execute()) {
 531                                         $errorInfo     = $stmt->errorInfo();
 532                                         $this->error   = $errorInfo[2];
 533                                         $this->errorno = $errorInfo[1];
 534                                         $retval        = false;
 535                                 } else {
 536                                         $retval              = $stmt;
 537                                         $this->affected_rows = $retval->rowCount();
 538                                 }
 539                                 break;
 540                         case 'mysqli':
 541                                 // There are SQL statements that cannot be executed with a prepared statement
 542                                 $parts           = explode(' ', $orig_sql);
 543                                 $command         = strtolower($parts[0]);
 544                                 $can_be_prepared = in_array($command, ['select', 'update', 'insert', 'delete']);
 545
 546                                 // The fallback routine is called as well when there are no arguments
 547                                 if (!$can_be_prepared || (count($args) == 0)) {
 548                                         $retval = $this->connection->query($this->replaceParameters($sql, $args));
 549                                         if ($this->connection->errno) {
 550                                                 $this->error   = $this->connection->error;
 551                                                 $this->errorno = $this->connection->errno;
 552                                                 $retval        = false;
 553                                         } else {
 554                                                 if (isset($retval->num_rows)) {
 555                                                         $this->affected_rows = $retval->num_rows;
 556                                                 } else {
 557                                                         $this->affected_rows = $this->connection->affected_rows;
 558                                                 }
 559                                         }
 560                                         break;
 561                                 }
 562
 563                                 $stmt = $this->connection->stmt_init();
 564
 565                                 if (!$stmt->prepare($sql)) {
 566                                         $this->error   = $stmt->error;
 567                                         $this->errorno = $stmt->errno;
 568                                         $retval        = false;
 569                                         break;
 570                                 }
 571
 572                                 $param_types = '';
 573                                 $values      = [];
 574                                 foreach ($args AS $param => $value) {
 575                                         if (is_int($args[$param])) {
 576                                                 $param_types .= 'i';
 577                                         } elseif (is_float($args[$param])) {
 578                                                 $param_types .= 'd';
 579                                         } elseif (is_string($args[$param])) {
 580                                                 $param_types .= 's';
 581                                         } else {
 582                                                 $param_types .= 'b';
 583                                         }
 584                                         $values[] = &$args[$param];
 585                                 }
 586
 587                                 if (count($values) > 0) {
 588                                         array_unshift($values, $param_types);
 589                                         call_user_func_array([$stmt, 'bind_param'], $values);
 590                                 }
 591
 592                                 if (!$stmt->execute()) {
 593                                         $this->error   = $this->connection->error;
 594                                         $this->errorno = $this->connection->errno;
 595                                         $retval        = false;
 596                                 } else {
 597                                         $stmt->store_result();
 598                                         $retval              = $stmt;
 599                                         $this->affected_rows = $retval->affected_rows;
 600                                 }
 601                                 break;
 602                 }
 603
 604                 // We are having an own error logging in the function "e"
 605                 if (($this->errorno != 0) && !$called_from_e) {
 606                         // We have to preserve the error code, somewhere in the logging it get lost
 607                         $error   = $this->error;
 608                         $errorno = $this->errorno;
 609
 610                         $this->logger->error('DB Error', [
 611                                 'code'      => $this->errorno,
 612                                 'error'     => $this->error,
 613                                 'callstack' => System::callstack(8),
 614                                 'params'    => $this->replaceParameters($sql, $args),
 615                         ]);
 616
 617                         // On a lost connection we try to reconnect - but only once.
 618                         if ($errorno == 2006) {
 619                                 if ($this->in_retrial || !$this->reconnect()) {
 620                                         // It doesn't make sense to continue when the database connection was lost
 621                                         if ($this->in_retrial) {
 622                                                 $this->logger->notice('Giving up retrial because of database error', [
 623                                                         'code'  => $this->errorno,
 624                                                         'error' => $this->error,
 625                                                 ]);
 626                                         } else {
 627                                                 $this->logger->notice('Couldn\'t reconnect after database error', [
 628                                                         'code'  => $this->errorno,
 629                                                         'error' => $this->error,
 630                                                 ]);
 631                                         }
 632                                         exit(1);
 633                                 } else {
 634                                         // We try it again
 635                                         $this->logger->notice('Reconnected after database error', [
 636                                                 'code'  => $this->errorno,
 637                                                 'error' => $this->error,
 638                                         ]);
 639                                         $this->in_retrial = true;
 640                                         $ret              = $this->p($sql, $args);
 641                                         $this->in_retrial = false;
 642                                         return $ret;
 643                                 }
 644                         }
 645
 646                         $this->error   = $error;
 647                         $this->errorno = $errorno;
 648                 }
 649
 650                 $this->profiler->saveTimestamp($stamp1, 'database', System::callstack());
 651
 652                 if ($this->configCache->get('system', 'db_log')) {
 653                         $stamp2   = microtime(true);
 654                         $duration = (float)($stamp2 - $stamp1);
 655
 656                         if (($duration > $this->configCache->get('system', 'db_loglimit'))) {
 657                                 $duration  = round($duration, 3);
 658                                 $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
 659
 660                                 @file_put_contents($this->configCache->get('system', 'db_log'), DateTimeFormat::utcNow() . "\t" . $duration . "\t" .
 661                                                                                                 basename($backtrace[1]["file"]) . "\t" .
 662                                                                                                 $backtrace[1]["line"] . "\t" . $backtrace[2]["function"] . "\t" .
 663                                                                                                 substr($this->replaceParameters($sql, $args), 0, 2000) . "\n", FILE_APPEND);
 664                         }
 665                 }
 666                 return $retval;
 667         }
 668
 669         /**
 670          * @brief Executes a prepared statement like UPDATE or INSERT that doesn't return data
 671          *
 672          * Please use DBA::delete, DBA::insert, DBA::update, ... instead
 673          *
 674          * @param string $sql SQL statement
 675          *
 676          * @return boolean Was the query successfull? False is returned only if an error occurred
 677          * @throws \Exception
 678          */
 679         public function e($sql)
 680         {
 681
 682                 $stamp = microtime(true);
 683
 684                 $params = DBA::getParam(func_get_args());
 685
 686                 // In a case of a deadlock we are repeating the query 20 times
 687                 $timeout = 20;
 688
 689                 do {
 690                         $stmt = $this->p($sql, $params);
 691
 692                         if (is_bool($stmt)) {
 693                                 $retval = $stmt;
 694                         } elseif (is_object($stmt)) {
 695                                 $retval = true;
 696                         } else {
 697                                 $retval = false;
 698                         }
 699
 700                         $this->close($stmt);
 701
 702                 } while (($this->errorno == 1213) && (--$timeout > 0));
 703
 704                 if ($this->errorno != 0) {
 705                         // We have to preserve the error code, somewhere in the logging it get lost
 706                         $error   = $this->error;
 707                         $errorno = $this->errorno;
 708
 709                         $this->logger->error('DB Error', [
 710                                 'code'      => $this->errorno,
 711                                 'error'     => $this->error,
 712                                 'callstack' => System::callstack(8),
 713                                 'params'    => $this->replaceParameters($sql, $params),
 714                         ]);
 715
 716                         // On a lost connection we simply quit.
 717                         // A reconnect like in $this->p could be dangerous with modifications
 718                         if ($errorno == 2006) {
 719                                 $this->logger->notice('Giving up because of database error', [
 720                                         'code'  => $this->errorno,
 721                                         'error' => $this->error,
 722                                 ]);
 723                                 exit(1);
 724                         }
 725
 726                         $this->error   = $error;
 727                         $this->errorno = $errorno;
 728                 }
 729
 730                 $this->profiler->saveTimestamp($stamp, "database_write", System::callstack());
 731
 732                 return $retval;
 733         }
 734
 735         /**
 736          * @brief Check if data exists
 737          *
 738          * @param string|array $table     Table name or array [schema => table]
 739          * @param array        $condition array of fields for condition
 740          *
 741          * @return boolean Are there rows for that condition?
 742          * @throws \Exception
 743          */
 744         public function exists($table, $condition)
 745         {
 746                 if (empty($table)) {
 747                         return false;
 748                 }
 749
 750                 $fields = [];
 751
 752                 if (empty($condition)) {
 753                         return DBStructure::existsTable($table);
 754                 }
 755
 756                 reset($condition);
 757                 $first_key = key($condition);
 758                 if (!is_int($first_key)) {
 759                         $fields = [$first_key];
 760                 }
 761
 762                 $stmt = $this->select($table, $fields, $condition, ['limit' => 1]);
 763
 764                 if (is_bool($stmt)) {
 765                         $retval = $stmt;
 766                 } else {
 767                         $retval = ($this->numRows($stmt) > 0);
 768                 }
 769
 770                 $this->close($stmt);
 771
 772                 return $retval;
 773         }
 774
 775         /**
 776          * Fetches the first row
 777          *
 778          * Please use DBA::selectFirst or DBA::exists whenever this is possible.
 779          *
 780          * @brief Fetches the first row
 781          *
 782          * @param string $sql SQL statement
 783          *
 784          * @return array first row of query
 785          * @throws \Exception
 786          */
 787         public function fetchFirst($sql)
 788         {
 789                 $params = DBA::getParam(func_get_args());
 790
 791                 $stmt = $this->p($sql, $params);
 792
 793                 if (is_bool($stmt)) {
 794                         $retval = $stmt;
 795                 } else {
 796                         $retval = $this->fetch($stmt);
 797                 }
 798
 799                 $this->close($stmt);
 800
 801                 return $retval;
 802         }
 803
 804         /**
 805          * @brief Returns the number of affected rows of the last statement
 806          *
 807          * @return int Number of rows
 808          */
 809         public function affectedRows()
 810         {
 811                 return $this->affected_rows;
 812         }
 813
 814         /**
 815          * @brief Returns the number of columns of a statement
 816          *
 817          * @param object Statement object
 818          *
 819          * @return int Number of columns
 820          */
 821         public function columnCount($stmt)
 822         {
 823                 if (!is_object($stmt)) {
 824                         return 0;
 825                 }
 826                 switch ($this->driver) {
 827                         case 'pdo':
 828                                 return $stmt->columnCount();
 829                         case 'mysqli':
 830                                 return $stmt->field_count;
 831                 }
 832                 return 0;
 833         }
 834
 835         /**
 836          * @brief Returns the number of rows of a statement
 837          *
 838          * @param PDOStatement|mysqli_result|mysqli_stmt Statement object
 839          *
 840          * @return int Number of rows
 841          */
 842         public function numRows($stmt)
 843         {
 844                 if (!is_object($stmt)) {
 845                         return 0;
 846                 }
 847                 switch ($this->driver) {
 848                         case 'pdo':
 849                                 return $stmt->rowCount();
 850                         case 'mysqli':
 851                                 return $stmt->num_rows;
 852                 }
 853                 return 0;
 854         }
 855
 856         /**
 857          * @brief Fetch a single row
 858          *
 859          * @param mixed $stmt statement object
 860          *
 861          * @return array current row
 862          */
 863         public function fetch($stmt)
 864         {
 865
 866                 $stamp1 = microtime(true);
 867
 868                 $columns = [];
 869
 870                 if (!is_object($stmt)) {
 871                         return false;
 872                 }
 873
 874                 switch ($this->driver) {
 875                         case 'pdo':
 876                                 $columns = $stmt->fetch(PDO::FETCH_ASSOC);
 877                                 break;
 878                         case 'mysqli':
 879                                 if (get_class($stmt) == 'mysqli_result') {
 880                                         $columns = $stmt->fetch_assoc();
 881                                         break;
 882                                 }
 883
 884                                 // This code works, but is slow
 885
 886                                 // Bind the result to a result array
 887                                 $cols = [];
 888
 889                                 $cols_num = [];
 890                                 for ($x = 0; $x < $stmt->field_count; $x++) {
 891                                         $cols[] = &$cols_num[$x];
 892                                 }
 893
 894                                 call_user_func_array([$stmt, 'bind_result'], $cols);
 895
 896                                 if (!$stmt->fetch()) {
 897                                         return false;
 898                                 }
 899
 900                                 // The slow part:
 901                                 // We need to get the field names for the array keys
 902                                 // It seems that there is no better way to do this.
 903                                 $result = $stmt->result_metadata();
 904                                 $fields = $result->fetch_fields();
 905
 906                                 foreach ($cols_num AS $param => $col) {
 907                                         $columns[$fields[$param]->name] = $col;
 908                                 }
 909                 }
 910
 911                 $this->profiler->saveTimestamp($stamp1, 'database', System::callstack());
 912
 913                 return $columns;
 914         }
 915
 916         /**
 917          * @brief Insert a row into a table
 918          *
 919          * @param string|array $table               Table name or array [schema => table]
 920          * @param array        $param               parameter array
 921          * @param bool         $on_duplicate_update Do an update on a duplicate entry
 922          *
 923          * @return boolean was the insert successful?
 924          * @throws \Exception
 925          */
 926         public function insert($table, $param, $on_duplicate_update = false)
 927         {
 928                 if (empty($table) || empty($param)) {
 929                         $this->logger->info('Table and fields have to be set');
 930                         return false;
 931                 }
 932
 933                 $table_string = DBA::buildTableString($table);
 934
 935                 $fields_string = implode(', ', array_map([DBA::class, 'quoteIdentifier'], array_keys($param)));
 936
 937                 $values_string = substr(str_repeat("?, ", count($param)), 0, -2);
 938
 939                 $sql = "INSERT INTO " . $table_string . " (" . $fields_string . ") VALUES (" . $values_string . ")";
 940
 941                 if ($on_duplicate_update) {
 942                         $fields_string = implode(' = ?, ', array_map([DBA::class, 'quoteIdentifier'], array_keys($param)));
 943
 944                         $sql .= " ON DUPLICATE KEY UPDATE " . $fields_string . " = ?";
 945
 946                         $values = array_values($param);
 947                         $param  = array_merge_recursive($values, $values);
 948                 }
 949
 950                 return $this->e($sql, $param);
 951         }
 952
 953         /**
 954          * @brief Fetch the id of the last insert command
 955          *
 956          * @return integer Last inserted id
 957          */
 958         public function lastInsertId()
 959         {
 960                 switch ($this->driver) {
 961                         case 'pdo':
 962                                 $id = $this->connection->lastInsertId();
 963                                 break;
 964                         case 'mysqli':
 965                                 $id = $this->connection->insert_id;
 966                                 break;
 967                 }
 968                 return $id;
 969         }
 970
 971         /**
 972          * @brief Locks a table for exclusive write access
 973          *
 974          * This function can be extended in the future to accept a table array as well.
 975          *
 976          * @param string|array $table Table name or array [schema => table]
 977          *
 978          * @return boolean was the lock successful?
 979          * @throws \Exception
 980          */
 981         public function lock($table)
 982         {
 983                 // See here: https://dev.mysql.com/doc/refman/5.7/en/lock-tables-and-transactions.html
 984                 if ($this->driver == 'pdo') {
 985                         $this->e("SET autocommit=0");
 986                         $this->connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, true);
 987                 } else {
 988                         $this->connection->autocommit(false);
 989                 }
 990
 991                 $success = $this->e("LOCK TABLES " . DBA::buildTableString($table) . " WRITE");
 992
 993                 if ($this->driver == 'pdo') {
 994                         $this->connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
 995                 }
 996
 997                 if (!$success) {
 998                         if ($this->driver == 'pdo') {
 999                                 $this->e("SET autocommit=1");
1000                         } else {
1001                                 $this->connection->autocommit(true);
1002                         }
1003                 } else {
1004                         $this->in_transaction = true;
1005                 }
1006                 return $success;
1007         }
1008
1009         /**
1010          * @brief Unlocks all locked tables
1011          *
1012          * @return boolean was the unlock successful?
1013          * @throws \Exception
1014          */
1015         public function unlock()
1016         {
1017                 // See here: https://dev.mysql.com/doc/refman/5.7/en/lock-tables-and-transactions.html
1018                 $this->performCommit();
1019
1020                 if ($this->driver == 'pdo') {
1021                         $this->connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, true);
1022                 }
1023
1024                 $success = $this->e("UNLOCK TABLES");
1025
1026                 if ($this->driver == 'pdo') {
1027                         $this->connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
1028                         $this->e("SET autocommit=1");
1029                 } else {
1030                         $this->connection->autocommit(true);
1031                 }
1032
1033                 $this->in_transaction = false;
1034                 return $success;
1035         }
1036
1037         /**
1038          * @brief Starts a transaction
1039          *
1040          * @return boolean Was the command executed successfully?
1041          */
1042         public function transaction()
1043         {
1044                 if (!$this->performCommit()) {
1045                         return false;
1046                 }
1047
1048                 switch ($this->driver) {
1049                         case 'pdo':
1050                                 if (!$this->connection->inTransaction() && !$this->connection->beginTransaction()) {
1051                                         return false;
1052                                 }
1053                                 break;
1054
1055                         case 'mysqli':
1056                                 if (!$this->connection->begin_transaction()) {
1057                                         return false;
1058                                 }
1059                                 break;
1060                 }
1061
1062                 $this->in_transaction = true;
1063                 return true;
1064         }
1065
1066         protected function performCommit()
1067         {
1068                 switch ($this->driver) {
1069                         case 'pdo':
1070                                 if (!$this->connection->inTransaction()) {
1071                                         return true;
1072                                 }
1073
1074                                 return $this->connection->commit();
1075
1076                         case 'mysqli':
1077                                 return $this->connection->commit();
1078                 }
1079
1080                 return true;
1081         }
1082
1083         /**
1084          * @brief Does a commit
1085          *
1086          * @return boolean Was the command executed successfully?
1087          */
1088         public function commit()
1089         {
1090                 if (!$this->performCommit()) {
1091                         return false;
1092                 }
1093                 $this->in_transaction = false;
1094                 return true;
1095         }
1096
1097         /**
1098          * @brief Does a rollback
1099          *
1100          * @return boolean Was the command executed successfully?
1101          */
1102         public function rollback()
1103         {
1104                 $ret = false;
1105
1106                 switch ($this->driver) {
1107                         case 'pdo':
1108                                 if (!$this->connection->inTransaction()) {
1109                                         $ret = true;
1110                                         break;
1111                                 }
1112                                 $ret = $this->connection->rollBack();
1113                                 break;
1114
1115                         case 'mysqli':
1116                                 $ret = $this->connection->rollback();
1117                                 break;
1118                 }
1119                 $this->in_transaction = false;
1120                 return $ret;
1121         }
1122
1123         /**
1124          * @brief Build the array with the table relations
1125          *
1126          * The array is build from the database definitions in DBStructure.php
1127          *
1128          * This process must only be started once, since the value is cached.
1129          */
1130         private function buildRelationData()
1131         {
1132                 $definition = DBStructure::definition($this->configCache->get('system', 'basepath'));
1133
1134                 foreach ($definition AS $table => $structure) {
1135                         foreach ($structure['fields'] AS $field => $field_struct) {
1136                                 if (isset($field_struct['relation'])) {
1137                                         foreach ($field_struct['relation'] AS $rel_table => $rel_field) {
1138                                                 $this->relation[$rel_table][$rel_field][$table][] = $field;
1139                                         }
1140                                 }
1141                         }
1142                 }
1143         }
1144
1145         /**
1146          * @brief Delete a row from a table
1147          *
1148          * Note: this methods does NOT accept schema => table arrays because of the complex relation stuff.
1149          *
1150          * @param string $table      Table name
1151          * @param array  $conditions Field condition(s)
1152          * @param array  $options
1153          *                           - cascade: If true we delete records in other tables that depend on the one we're deleting through
1154          *                           relations (default: true)
1155          * @param array  $callstack  Internal use: prevent endless loops
1156          *
1157          * @return boolean was the delete successful?
1158          * @throws \Exception
1159          */
1160         public function delete($table, array $conditions, array $options = [], array &$callstack = [])
1161         {
1162                 if (empty($table) || empty($conditions)) {
1163                         $this->logger->info('Table and conditions have to be set');
1164                         return false;
1165                 }
1166
1167                 $commands = [];
1168
1169                 // Create a key for the loop prevention
1170                 $key = $table . ':' . json_encode($conditions);
1171
1172                 // We quit when this key already exists in the callstack.
1173                 if (isset($callstack[$key])) {
1174                         return true;
1175                 }
1176
1177                 $callstack[$key] = true;
1178
1179                 $commands[$key] = ['table' => $table, 'conditions' => $conditions];
1180
1181                 // Don't use "defaults" here, since it would set "false" to "true"
1182                 if (isset($options['cascade'])) {
1183                         $cascade = $options['cascade'];
1184                 } else {
1185                         $cascade = true;
1186                 }
1187
1188                 // To speed up the whole process we cache the table relations
1189                 if ($cascade && count($this->relation) == 0) {
1190                         $this->buildRelationData();
1191                 }
1192
1193                 // Is there a relation entry for the table?
1194                 if ($cascade && isset($this->relation[$table])) {
1195                         // We only allow a simple "one field" relation.
1196                         $field   = array_keys($this->relation[$table])[0];
1197                         $rel_def = array_values($this->relation[$table])[0];
1198
1199                         // Create a key for preventing double queries
1200                         $qkey = $field . '-' . $table . ':' . json_encode($conditions);
1201
1202                         // When the search field is the relation field, we don't need to fetch the rows
1203                         // This is useful when the leading record is already deleted in the frontend but the rest is done in the backend
1204                         if ((count($conditions) == 1) && ($field == array_keys($conditions)[0])) {
1205                                 foreach ($rel_def AS $rel_table => $rel_fields) {
1206                                         foreach ($rel_fields AS $rel_field) {
1207                                                 $this->delete($rel_table, [$rel_field => array_values($conditions)[0]], $options, $callstack);
1208                                         }
1209                                 }
1210                                 // We quit when this key already exists in the callstack.
1211                         } elseif (!isset($callstack[$qkey])) {
1212                                 $callstack[$qkey] = true;
1213
1214                                 // Fetch all rows that are to be deleted
1215                                 $data = $this->select($table, [$field], $conditions);
1216
1217                                 while ($row = $this->fetch($data)) {
1218                                         $this->delete($table, [$field => $row[$field]], $options, $callstack);
1219                                 }
1220
1221                                 $this->close($data);
1222
1223                                 // Since we had split the delete command we don't need the original command anymore
1224                                 unset($commands[$key]);
1225                         }
1226                 }
1227
1228                 // Now we finalize the process
1229                 $do_transaction = !$this->in_transaction;
1230
1231                 if ($do_transaction) {
1232                         $this->transaction();
1233                 }
1234
1235                 $compacted = [];
1236                 $counter   = [];
1237
1238                 foreach ($commands AS $command) {
1239                         $conditions = $command['conditions'];
1240                         reset($conditions);
1241                         $first_key = key($conditions);
1242
1243                         $condition_string = DBA::buildCondition($conditions);
1244
1245                         if ((count($command['conditions']) > 1) || is_int($first_key)) {
1246                                 $sql = "DELETE FROM " . DBA::quoteIdentifier($command['table']) . " " . $condition_string;
1247                                 $this->logger->debug($this->replaceParameters($sql, $conditions));
1248
1249                                 if (!$this->e($sql, $conditions)) {
1250                                         if ($do_transaction) {
1251                                                 $this->rollback();
1252                                         }
1253                                         return false;
1254                                 }
1255                         } else {
1256                                 $key_table     = $command['table'];
1257                                 $key_condition = array_keys($command['conditions'])[0];
1258                                 $value         = array_values($command['conditions'])[0];
1259
1260                                 // Split the SQL queries in chunks of 100 values
1261                                 // We do the $i stuff here to make the code better readable
1262                                 $i = isset($counter[$key_table][$key_condition]) ? $counter[$key_table][$key_condition] : 0;
1263                                 if (isset($compacted[$key_table][$key_condition][$i]) && count($compacted[$key_table][$key_condition][$i]) > 100) {
1264                                         ++$i;
1265                                 }
1266
1267                                 $compacted[$key_table][$key_condition][$i][$value] = $value;
1268                                 $counter[$key_table][$key_condition]               = $i;
1269                         }
1270                 }
1271                 foreach ($compacted AS $table => $values) {
1272                         foreach ($values AS $field => $field_value_list) {
1273                                 foreach ($field_value_list AS $field_values) {
1274                                         $sql = "DELETE FROM " . DBA::quoteIdentifier($table) . " WHERE " . DBA::quoteIdentifier($field) . " IN (" .
1275                                                substr(str_repeat("?, ", count($field_values)), 0, -2) . ");";
1276
1277                                         $this->logger->debug($this->replaceParameters($sql, $field_values));
1278
1279                                         if (!$this->e($sql, $field_values)) {
1280                                                 if ($do_transaction) {
1281                                                         $this->rollback();
1282                                                 }
1283                                                 return false;
1284                                         }
1285                                 }
1286                         }
1287                 }
1288                 if ($do_transaction) {
1289                         $this->commit();
1290                 }
1291                 return true;
1292         }
1293
1294         /**
1295          * @brief Updates rows
1296          *
1297          * Updates rows in the database. When $old_fields is set to an array,
1298          * the system will only do an update if the fields in that array changed.
1299          *
1300          * Attention:
1301          * Only the values in $old_fields are compared.
1302          * This is an intentional behaviour.
1303          *
1304          * Example:
1305          * We include the timestamp field in $fields but not in $old_fields.
1306          * Then the row will only get the new timestamp when the other fields had changed.
1307          *
1308          * When $old_fields is set to a boolean value the system will do this compare itself.
1309          * When $old_fields is set to "true" the system will do an insert if the row doesn't exists.
1310          *
1311          * Attention:
1312          * Only set $old_fields to a boolean value when you are sure that you will update a single row.
1313          * When you set $old_fields to "true" then $fields must contain all relevant fields!
1314          *
1315          * @param string|array  $table      Table name or array [schema => table]
1316          * @param array         $fields     contains the fields that are updated
1317          * @param array         $condition  condition array with the key values
1318          * @param array|boolean $old_fields array with the old field values that are about to be replaced (true = update on duplicate)
1319          *
1320          * @return boolean was the update successfull?
1321          * @throws \Exception
1322          */
1323         public function update($table, $fields, $condition, $old_fields = [])
1324         {
1325                 if (empty($table) || empty($fields) || empty($condition)) {
1326                         $this->logger->info('Table, fields and condition have to be set');
1327                         return false;
1328                 }
1329
1330                 $table_string = DBA::buildTableString($table);
1331
1332                 $condition_string = DBA::buildCondition($condition);
1333
1334                 if (is_bool($old_fields)) {
1335                         $do_insert = $old_fields;
1336
1337                         $old_fields = $this->selectFirst($table, [], $condition);
1338
1339                         if (is_bool($old_fields)) {
1340                                 if ($do_insert) {
1341                                         $values = array_merge($condition, $fields);
1342                                         return $this->insert($table, $values, $do_insert);
1343                                 }
1344                                 $old_fields = [];
1345                         }
1346                 }
1347
1348                 $do_update = (count($old_fields) == 0);
1349
1350                 foreach ($old_fields AS $fieldname => $content) {
1351                         if (isset($fields[$fieldname])) {
1352                                 if (($fields[$fieldname] == $content) && !is_null($content)) {
1353                                         unset($fields[$fieldname]);
1354                                 } else {
1355                                         $do_update = true;
1356                                 }
1357                         }
1358                 }
1359
1360                 if (!$do_update || (count($fields) == 0)) {
1361                         return true;
1362                 }
1363
1364                 $sql = "UPDATE " . $table_string . " SET "
1365                         . implode(" = ?, ", array_map([DBA::class, 'quoteIdentifier'], array_keys($fields))) . " = ?"
1366                         . $condition_string;
1367
1368                 $params1 = array_values($fields);
1369                 $params2 = array_values($condition);
1370                 $params  = array_merge_recursive($params1, $params2);
1371
1372                 return $this->e($sql, $params);
1373         }
1374
1375         /**
1376          * Retrieve a single record from a table and returns it in an associative array
1377          *
1378          * @brief Retrieve a single record from a table
1379          *
1380          * @param string|array $table
1381          * @param array        $fields
1382          * @param array        $condition
1383          * @param array        $params
1384          *
1385          * @return bool|array
1386          * @throws \Exception
1387          * @see   $this->select
1388          */
1389         public function selectFirst($table, array $fields = [], array $condition = [], $params = [])
1390         {
1391                 $params['limit'] = 1;
1392                 $result          = $this->select($table, $fields, $condition, $params);
1393
1394                 if (is_bool($result)) {
1395                         return $result;
1396                 } else {
1397                         $row = $this->fetch($result);
1398                         $this->close($result);
1399                         return $row;
1400                 }
1401         }
1402
1403         /**
1404          * @brief Select rows from a table and fills an array with the data
1405          *
1406          * @param string|array $table     Table name or array [schema => table]
1407          * @param array        $fields    Array of selected fields, empty for all
1408          * @param array        $condition Array of fields for condition
1409          * @param array        $params    Array of several parameters
1410          *
1411          * @return array Data array
1412          * @throws \Exception
1413          * @see   self::select
1414          */
1415         public function selectToArray($table, array $fields = [], array $condition = [], array $params = [])
1416         {
1417                 return $this->toArray($this->select($table, $fields, $condition, $params));
1418         }
1419
1420         /**
1421          * @brief Select rows from a table
1422          *
1423          * @param string|array $table     Table name or array [schema => table]
1424          * @param array        $fields    Array of selected fields, empty for all
1425          * @param array        $condition Array of fields for condition
1426          * @param array        $params    Array of several parameters
1427          *
1428          * @return boolean|object
1429          *
1430          * Example:
1431          * $table = "item";
1432          * $fields = array("id", "uri", "uid", "network");
1433          *
1434          * $condition = array("uid" => 1, "network" => 'dspr');
1435          * or:
1436          * $condition = array("`uid` = ? AND `network` IN (?, ?)", 1, 'dfrn', 'dspr');
1437          *
1438          * $params = array("order" => array("id", "received" => true), "limit" => 10);
1439          *
1440          * $data = DBA::select($table, $fields, $condition, $params);
1441          * @throws \Exception
1442          */
1443         public function select($table, array $fields = [], array $condition = [], array $params = [])
1444         {
1445                 if (empty($table)) {
1446                         return false;
1447                 }
1448
1449                 if (count($fields) > 0) {
1450                         $select_string = implode(', ', array_map([DBA::class, 'quoteIdentifier'], $fields));
1451                 } else {
1452                         $select_string = '*';
1453                 }
1454
1455                 $table_string = DBA::buildTableString($table);
1456
1457                 $condition_string = DBA::buildCondition($condition);
1458
1459                 $param_string = DBA::buildParameter($params);
1460
1461                 $sql = "SELECT " . $select_string . " FROM " . $table_string . $condition_string . $param_string;
1462
1463                 $result = $this->p($sql, $condition);
1464
1465                 return $result;
1466         }
1467
1468         /**
1469          * @brief Counts the rows from a table satisfying the provided condition
1470          *
1471          * @param string|array $table     Table name or array [schema => table]
1472          * @param array        $condition Array of fields for condition
1473          * @param array        $params    Array of several parameters
1474          *
1475          * @return int
1476          *
1477          * Example:
1478          * $table = "item";
1479          *
1480          * $condition = ["uid" => 1, "network" => 'dspr'];
1481          * or:
1482          * $condition = ["`uid` = ? AND `network` IN (?, ?)", 1, 'dfrn', 'dspr'];
1483          *
1484          * $count = DBA::count($table, $condition);
1485          * @throws \Exception
1486          */
1487         public function count($table, array $condition = [], array $params = [])
1488         {
1489                 if (empty($table)) {
1490                         return false;
1491                 }
1492
1493                 $table_string = DBA::buildTableString($table);
1494
1495                 $condition_string = DBA::buildCondition($condition);
1496
1497                 if (empty($params['expression'])) {
1498                         $expression = '*';
1499                 } elseif (!empty($params['distinct'])) {
1500                         $expression = "DISTINCT " . DBA::quoteIdentifier($params['expression']);
1501                 } else {
1502                         $expression = DBA::quoteIdentifier($params['expression']);
1503                 }
1504
1505                 $sql = "SELECT COUNT(" . $expression . ") AS `count` FROM " . $table_string . $condition_string;
1506
1507                 $row = $this->fetchFirst($sql, $condition);
1508
1509                 return $row['count'];
1510         }
1511
1512         /**
1513          * @brief Fills an array with data from a query
1514          *
1515          * @param object $stmt statement object
1516          * @param bool   $do_close
1517          *
1518          * @return array Data array
1519          */
1520         public function toArray($stmt, $do_close = true)
1521         {
1522                 if (is_bool($stmt)) {
1523                         return [];
1524                 }
1525
1526                 $data = [];
1527                 while ($row = $this->fetch($stmt)) {
1528                         $data[] = $row;
1529                 }
1530
1531                 if ($do_close) {
1532                         $this->close($stmt);
1533                 }
1534
1535                 return $data;
1536         }
1537
1538         /**
1539          * @brief Returns the error number of the last query
1540          *
1541          * @return string Error number (0 if no error)
1542          */
1543         public function errorNo()
1544         {
1545                 return $this->errorno;
1546         }
1547
1548         /**
1549          * @brief Returns the error message of the last query
1550          *
1551          * @return string Error message ('' if no error)
1552          */
1553         public function errorMessage()
1554         {
1555                 return $this->error;
1556         }
1557
1558         /**
1559          * @brief Closes the current statement
1560          *
1561          * @param object $stmt statement object
1562          *
1563          * @return boolean was the close successful?
1564          */
1565         public function close($stmt)
1566         {
1567
1568                 $stamp1 = microtime(true);
1569
1570                 if (!is_object($stmt)) {
1571                         return false;
1572                 }
1573
1574                 switch ($this->driver) {
1575                         case 'pdo':
1576                                 $ret = $stmt->closeCursor();
1577                                 break;
1578                         case 'mysqli':
1579                                 // MySQLi offers both a mysqli_stmt and a mysqli_result class.
1580                                 // We should be careful not to assume the object type of $stmt
1581                                 // because DBA::p() has been able to return both types.
1582                                 if ($stmt instanceof mysqli_stmt) {
1583                                         $stmt->free_result();
1584                                         $ret = $stmt->close();
1585                                 } elseif ($stmt instanceof mysqli_result) {
1586                                         $stmt->free();
1587                                         $ret = true;
1588                                 } else {
1589                                         $ret = false;
1590                                 }
1591                                 break;
1592                 }
1593
1594                 $this->profiler->saveTimestamp($stamp1, 'database', System::callstack());
1595
1596                 return $ret;
1597         }
1598
1599         /**
1600          * @brief Return a list of database processes
1601          *
1602          * @return array
1603          *      'list' => List of processes, separated in their different states
1604          *      'amount' => Number of concurrent database processes
1605          * @throws \Exception
1606          */
1607         public function processlist()
1608         {
1609                 $ret  = $this->p("SHOW PROCESSLIST");
1610                 $data = $this->toArray($ret);
1611
1612                 $processes = 0;
1613                 $states    = [];
1614                 foreach ($data as $process) {
1615                         $state = trim($process["State"]);
1616
1617                         // Filter out all non blocking processes
1618                         if (!in_array($state, ["", "init", "statistics", "updating"])) {
1619                                 ++$states[$state];
1620                                 ++$processes;
1621                         }
1622                 }
1623
1624                 $statelist = "";
1625                 foreach ($states as $state => $usage) {
1626                         if ($statelist != "") {
1627                                 $statelist .= ", ";
1628                         }
1629                         $statelist .= $state . ": " . $usage;
1630                 }
1631                 return (["list" => $statelist, "amount" => $processes]);
1632         }
1633
1634         /**
1635          * Checks if $array is a filled array with at least one entry.
1636          *
1637          * @param mixed $array A filled array with at least one entry
1638          *
1639          * @return boolean Whether $array is a filled array or an object with rows
1640          */
1641         public function isResult($array)
1642         {
1643                 // It could be a return value from an update statement
1644                 if (is_bool($array)) {
1645                         return $array;
1646                 }
1647
1648                 if (is_object($array)) {
1649                         return $this->numRows($array) > 0;
1650                 }
1651
1652                 return (is_array($array) && (count($array) > 0));
1653         }
1654
1655         /**
1656          * @brief Callback function for "esc_array"
1657          *
1658          * @param mixed   $value         Array value
1659          * @param string  $key           Array key
1660          * @param boolean $add_quotation add quotation marks for string values
1661          *
1662          * @return void
1663          */
1664         private function escapeArrayCallback(&$value, $key, $add_quotation)
1665         {
1666                 if (!$add_quotation) {
1667                         if (is_bool($value)) {
1668                                 $value = ($value ? '1' : '0');
1669                         } else {
1670                                 $value = $this->escape($value);
1671                         }
1672                         return;
1673                 }
1674
1675                 if (is_bool($value)) {
1676                         $value = ($value ? 'true' : 'false');
1677                 } elseif (is_float($value) || is_integer($value)) {
1678                         $value = (string)$value;
1679                 } else {
1680                         $value = "'" . $this->escape($value) . "'";
1681                 }
1682         }
1683
1684         /**
1685          * @brief Escapes a whole array
1686          *
1687          * @param mixed   $arr           Array with values to be escaped
1688          * @param boolean $add_quotation add quotation marks for string values
1689          *
1690          * @return void
1691          */
1692         public function escapeArray(&$arr, $add_quotation = false)
1693         {
1694                 array_walk($arr, [$this, 'escapeArrayCallback'], $add_quotation);
1695         }
1696 }