src/Database/DBA.php

   1 <?php
   2
   3 namespace Friendica\Database;
   4
   5 // Do not use Core\Config in this class at risk of infinite loop.
   6 // Please use App->getConfigVariable() instead.
   7 //use Friendica\Core\Config;
   8
   9 use Friendica\Core\System;
  10 use Friendica\Util\DateTimeFormat;
  11 use mysqli;
  12 use mysqli_result;
  13 use mysqli_stmt;
  14 use PDO;
  15 use PDOException;
  16 use PDOStatement;
  17
  18 require_once 'include/dba.php';
  19
  20 /**
  21  * @class MySQL database class
  22  *
  23  * This class is for the low level database stuff that does driver specific things.
  24  */
  25 class DBA
  26 {
  27         public static $connected = false;
  28
  29         private static $server_info = '';
  30         private static $connection;
  31         private static $driver;
  32         private static $error = false;
  33         private static $errorno = 0;
  34         private static $affected_rows = 0;
  35         private static $in_transaction = false;
  36         private static $in_retrial = false;
  37         private static $relation = [];
  38         private static $db_serveraddr = '';
  39         private static $db_user = '';
  40         private static $db_pass = '';
  41         private static $db_name = '';
  42         private static $db_charset = '';
  43
  44         public static function connect($serveraddr, $user, $pass, $db, $charset = null)
  45         {
  46                 if (!is_null(self::$connection) && self::connected()) {
  47                         return true;
  48                 }
  49
  50                 // We are storing these values for being able to perform a reconnect
  51                 self::$db_serveraddr = $serveraddr;
  52                 self::$db_user = $user;
  53                 self::$db_pass = $pass;
  54                 self::$db_name = $db;
  55                 self::$db_charset = $charset;
  56
  57                 $port = 0;
  58                 $serveraddr = trim($serveraddr);
  59
  60                 $serverdata = explode(':', $serveraddr);
  61                 $server = $serverdata[0];
  62
  63                 if (count($serverdata) > 1) {
  64                         $port = trim($serverdata[1]);
  65                 }
  66
  67                 $server = trim($server);
  68                 $user = trim($user);
  69                 $pass = trim($pass);
  70                 $db = trim($db);
  71                 $charset = trim($charset);
  72
  73                 if (!(strlen($server) && strlen($user))) {
  74                         return false;
  75                 }
  76
  77                 if (class_exists('\PDO') && in_array('mysql', PDO::getAvailableDrivers())) {
  78                         self::$driver = 'pdo';
  79                         $connect = "mysql:host=".$server.";dbname=".$db;
  80
  81                         if ($port > 0) {
  82                                 $connect .= ";port=".$port;
  83                         }
  84
  85                         if ($charset) {
  86                                 $connect .= ";charset=".$charset;
  87                         }
  88
  89                         try {
  90                                 self::$connection = @new PDO($connect, $user, $pass);
  91                                 self::$connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
  92                                 self::$connected = true;
  93                         } catch (PDOException $e) {
  94                         }
  95                 }
  96
  97                 if (!self::$connected && class_exists('\mysqli')) {
  98                         self::$driver = 'mysqli';
  99
 100                         if ($port > 0) {
 101                                 self::$connection = @new mysqli($server, $user, $pass, $db, $port);
 102                         } else {
 103                                 self::$connection = @new mysqli($server, $user, $pass, $db);
 104                         }
 105
 106                         if (!mysqli_connect_errno()) {
 107                                 self::$connected = true;
 108
 109                                 if ($charset) {
 110                                         self::$connection->set_charset($charset);
 111                                 }
 112                         }
 113                 }
 114
 115                 // No suitable SQL driver was found.
 116                 if (!self::$connected) {
 117                         self::$driver = null;
 118                         self::$connection = null;
 119                 }
 120
 121                 return self::$connected;
 122         }
 123
 124         /**
 125          * Disconnects the current database connection
 126          */
 127         public static function disconnect()
 128         {
 129                 if (is_null(self::$connection)) {
 130                         return;
 131                 }
 132
 133                 switch (self::$driver) {
 134                         case 'pdo':
 135                                 self::$connection = null;
 136                                 break;
 137                         case 'mysqli':
 138                                 self::$connection->close();
 139                                 self::$connection = null;
 140                                 break;
 141                 }
 142         }
 143
 144         /**
 145          * Perform a reconnect of an existing database connection
 146          */
 147         public static function reconnect() {
 148                 self::disconnect();
 149
 150                 $ret = self::connect(self::$db_serveraddr, self::$db_user, self::$db_pass, self::$db_name, self::$db_charset);
 151                 return $ret;
 152         }
 153
 154         /**
 155          * Return the database object.
 156          * @return PDO|mysqli
 157          */
 158         public static function getConnection()
 159         {
 160                 return self::$connection;
 161         }
 162
 163         /**
 164          * @brief Returns the MySQL server version string
 165          *
 166          * This function discriminate between the deprecated mysql API and the current
 167          * object-oriented mysqli API. Example of returned string: 5.5.46-0+deb8u1
 168          *
 169          * @return string
 170          */
 171         public static function serverInfo() {
 172                 if (self::$server_info == '') {
 173                         switch (self::$driver) {
 174                                 case 'pdo':
 175                                         self::$server_info = self::$connection->getAttribute(PDO::ATTR_SERVER_VERSION);
 176                                         break;
 177                                 case 'mysqli':
 178                                         self::$server_info = self::$connection->server_info;
 179                                         break;
 180                         }
 181                 }
 182                 return self::$server_info;
 183         }
 184
 185         /**
 186          * @brief Returns the selected database name
 187          *
 188          * @return string
 189          */
 190         public static function databaseName() {
 191                 $ret = self::p("SELECT DATABASE() AS `db`");
 192                 $data = self::toArray($ret);
 193                 return $data[0]['db'];
 194         }
 195
 196         /**
 197          * @brief Analyze a database query and log this if some conditions are met.
 198          *
 199          * @param string $query The database query that will be analyzed
 200          */
 201         private static function logIndex($query) {
 202                 $a = get_app();
 203
 204                 if (!$a->getConfigVariable('system', 'db_log_index')) {
 205                         return;
 206                 }
 207
 208                 // Don't explain an explain statement
 209                 if (strtolower(substr($query, 0, 7)) == "explain") {
 210                         return;
 211                 }
 212
 213                 // Only do the explain on "select", "update" and "delete"
 214                 if (!in_array(strtolower(substr($query, 0, 6)), ["select", "update", "delete"])) {
 215                         return;
 216                 }
 217
 218                 $r = self::p("EXPLAIN ".$query);
 219                 if (!DBM::is_result($r)) {
 220                         return;
 221                 }
 222
 223                 $watchlist = explode(',', $a->getConfigVariable('system', 'db_log_index_watch'));
 224                 $blacklist = explode(',', $a->getConfigVariable('system', 'db_log_index_blacklist'));
 225
 226                 while ($row = self::fetch($r)) {
 227                         if ((intval($a->getConfigVariable('system', 'db_loglimit_index')) > 0)) {
 228                                 $log = (in_array($row['key'], $watchlist) &&
 229                                         ($row['rows'] >= intval($a->getConfigVariable('system', 'db_loglimit_index'))));
 230                         } else {
 231                                 $log = false;
 232                         }
 233
 234                         if ((intval($a->getConfigVariable('system', 'db_loglimit_index_high')) > 0) && ($row['rows'] >= intval($a->getConfigVariable('system', 'db_loglimit_index_high')))) {
 235                                 $log = true;
 236                         }
 237
 238                         if (in_array($row['key'], $blacklist) || ($row['key'] == "")) {
 239                                 $log = false;
 240                         }
 241
 242                         if ($log) {
 243                                 $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
 244                                 @file_put_contents($a->getConfigVariable('system', 'db_log_index'), DateTimeFormat::utcNow()."\t".
 245                                                 $row['key']."\t".$row['rows']."\t".$row['Extra']."\t".
 246                                                 basename($backtrace[1]["file"])."\t".
 247                                                 $backtrace[1]["line"]."\t".$backtrace[2]["function"]."\t".
 248                                                 substr($query, 0, 2000)."\n", FILE_APPEND);
 249                         }
 250                 }
 251         }
 252
 253         public static function escape($str) {
 254                 switch (self::$driver) {
 255                         case 'pdo':
 256                                 return substr(@self::$connection->quote($str, PDO::PARAM_STR), 1, -1);
 257                         case 'mysqli':
 258                                 return @self::$connection->real_escape_string($str);
 259                 }
 260         }
 261
 262         public static function connected() {
 263                 $connected = false;
 264
 265                 if (is_null(self::$connection)) {
 266                         return false;
 267                 }
 268
 269                 switch (self::$driver) {
 270                         case 'pdo':
 271                                 $r = self::p("SELECT 1");
 272                                 if (DBM::is_result($r)) {
 273                                         $row = self::toArray($r);
 274                                         $connected = ($row[0]['1'] == '1');
 275                                 }
 276                                 break;
 277                         case 'mysqli':
 278                                 $connected = self::$connection->ping();
 279                                 break;
 280                 }
 281                 return $connected;
 282         }
 283
 284         /**
 285          * @brief Replaces ANY_VALUE() function by MIN() function,
 286          *  if the database server does not support ANY_VALUE().
 287          *
 288          * Considerations for Standard SQL, or MySQL with ONLY_FULL_GROUP_BY (default since 5.7.5).
 289          * ANY_VALUE() is available from MySQL 5.7.5 https://dev.mysql.com/doc/refman/5.7/en/miscellaneous-functions.html
 290          * A standard fall-back is to use MIN().
 291          *
 292          * @param string $sql An SQL string without the values
 293          * @return string The input SQL string modified if necessary.
 294          */
 295         public static function anyValueFallback($sql) {
 296                 $server_info = self::serverInfo();
 297                 if (version_compare($server_info, '5.7.5', '<') ||
 298                         (stripos($server_info, 'MariaDB') !== false)) {
 299                         $sql = str_ireplace('ANY_VALUE(', 'MIN(', $sql);
 300                 }
 301                 return $sql;
 302         }
 303
 304         /**
 305          * @brief beautifies the query - useful for "SHOW PROCESSLIST"
 306          *
 307          * This is safe when we bind the parameters later.
 308          * The parameter values aren't part of the SQL.
 309          *
 310          * @param string $sql An SQL string without the values
 311          * @return string The input SQL string modified if necessary.
 312          */
 313         public static function cleanQuery($sql) {
 314                 $search = ["\t", "\n", "\r", "  "];
 315                 $replace = [' ', ' ', ' ', ' '];
 316                 do {
 317                         $oldsql = $sql;
 318                         $sql = str_replace($search, $replace, $sql);
 319                 } while ($oldsql != $sql);
 320
 321                 return $sql;
 322         }
 323
 324
 325         /**
 326          * @brief Replaces the ? placeholders with the parameters in the $args array
 327          *
 328          * @param string $sql SQL query
 329          * @param array $args The parameters that are to replace the ? placeholders
 330          * @return string The replaced SQL query
 331          */
 332         private static function replaceParameters($sql, $args) {
 333                 $offset = 0;
 334                 foreach ($args AS $param => $value) {
 335                         if (is_int($args[$param]) || is_float($args[$param])) {
 336                                 $replace = intval($args[$param]);
 337                         } else {
 338                                 $replace = "'".self::escape($args[$param])."'";
 339                         }
 340
 341                         $pos = strpos($sql, '?', $offset);
 342                         if ($pos !== false) {
 343                                 $sql = substr_replace($sql, $replace, $pos, 1);
 344                         }
 345                         $offset = $pos + strlen($replace);
 346                 }
 347                 return $sql;
 348         }
 349
 350         /**
 351          * @brief Convert parameter array to an universal form
 352          * @param array $args Parameter array
 353          * @return array universalized parameter array
 354          */
 355         private static function getParam($args) {
 356                 unset($args[0]);
 357
 358                 // When the second function parameter is an array then use this as the parameter array
 359                 if ((count($args) > 0) && (is_array($args[1]))) {
 360                         return $args[1];
 361                 } else {
 362                         return $args;
 363                 }
 364         }
 365
 366         /**
 367          * @brief Executes a prepared statement that returns data
 368          * @usage Example: $r = p("SELECT * FROM `item` WHERE `guid` = ?", $guid);
 369          *
 370          * Please only use it with complicated queries.
 371          * For all regular queries please use dba::select or dba::exists
 372          *
 373          * @param string $sql SQL statement
 374          * @return bool|object statement object or result object
 375          */
 376         public static function p($sql) {
 377                 $a = get_app();
 378
 379                 $stamp1 = microtime(true);
 380
 381                 $params = self::getParam(func_get_args());
 382
 383                 // Renumber the array keys to be sure that they fit
 384                 $i = 0;
 385                 $args = [];
 386                 foreach ($params AS $param) {
 387                         // Avoid problems with some MySQL servers and boolean values. See issue #3645
 388                         if (is_bool($param)) {
 389                                 $param = (int)$param;
 390                         }
 391                         $args[++$i] = $param;
 392                 }
 393
 394                 if (!self::$connected) {
 395                         return false;
 396                 }
 397
 398                 if ((substr_count($sql, '?') != count($args)) && (count($args) > 0)) {
 399                         // Question: Should we continue or stop the query here?
 400                         logger('Parameter mismatch. Query "'.$sql.'" - Parameters '.print_r($args, true), LOGGER_DEBUG);
 401                 }
 402
 403                 $sql = self::cleanQuery($sql);
 404                 $sql = self::anyValueFallback($sql);
 405
 406                 $orig_sql = $sql;
 407
 408                 if ($a->getConfigValue('system', 'db_callstack')) {
 409                         $sql = "/*".System::callstack()." */ ".$sql;
 410                 }
 411
 412                 self::$error = '';
 413                 self::$errorno = 0;
 414                 self::$affected_rows = 0;
 415
 416                 // We have to make some things different if this function is called from "e"
 417                 $trace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 2);
 418
 419                 if (isset($trace[1])) {
 420                         $called_from = $trace[1];
 421                 } else {
 422                         // We use just something that is defined to avoid warnings
 423                         $called_from = $trace[0];
 424                 }
 425                 // We are having an own error logging in the function "e"
 426                 $called_from_e = ($called_from['function'] == 'e');
 427
 428                 switch (self::$driver) {
 429                         case 'pdo':
 430                                 // If there are no arguments we use "query"
 431                                 if (count($args) == 0) {
 432                                         if (!$retval = self::$connection->query($sql)) {
 433                                                 $errorInfo = self::$connection->errorInfo();
 434                                                 self::$error = $errorInfo[2];
 435                                                 self::$errorno = $errorInfo[1];
 436                                                 $retval = false;
 437                                                 break;
 438                                         }
 439                                         self::$affected_rows = $retval->rowCount();
 440                                         break;
 441                                 }
 442
 443                                 if (!$stmt = self::$connection->prepare($sql)) {
 444                                         $errorInfo = self::$connection->errorInfo();
 445                                         self::$error = $errorInfo[2];
 446                                         self::$errorno = $errorInfo[1];
 447                                         $retval = false;
 448                                         break;
 449                                 }
 450
 451                                 foreach ($args AS $param => $value) {
 452                                         if (is_int($args[$param])) {
 453                                                 $data_type = PDO::PARAM_INT;
 454                                         } else {
 455                                                 $data_type = PDO::PARAM_STR;
 456                                         }
 457                                         $stmt->bindParam($param, $args[$param], $data_type);
 458                                 }
 459
 460                                 if (!$stmt->execute()) {
 461                                         $errorInfo = $stmt->errorInfo();
 462                                         self::$error = $errorInfo[2];
 463                                         self::$errorno = $errorInfo[1];
 464                                         $retval = false;
 465                                 } else {
 466                                         $retval = $stmt;
 467                                         self::$affected_rows = $retval->rowCount();
 468                                 }
 469                                 break;
 470                         case 'mysqli':
 471                                 // There are SQL statements that cannot be executed with a prepared statement
 472                                 $parts = explode(' ', $orig_sql);
 473                                 $command = strtolower($parts[0]);
 474                                 $can_be_prepared = in_array($command, ['select', 'update', 'insert', 'delete']);
 475
 476                                 // The fallback routine is called as well when there are no arguments
 477                                 if (!$can_be_prepared || (count($args) == 0)) {
 478                                         $retval = self::$connection->query(self::replaceParameters($sql, $args));
 479                                         if (self::$connection->errno) {
 480                                                 self::$error = self::$connection->error;
 481                                                 self::$errorno = self::$connection->errno;
 482                                                 $retval = false;
 483                                         } else {
 484                                                 if (isset($retval->num_rows)) {
 485                                                         self::$affected_rows = $retval->num_rows;
 486                                                 } else {
 487                                                         self::$affected_rows = self::$connection->affected_rows;
 488                                                 }
 489                                         }
 490                                         break;
 491                                 }
 492
 493                                 $stmt = self::$connection->stmt_init();
 494
 495                                 if (!$stmt->prepare($sql)) {
 496                                         self::$error = $stmt->error;
 497                                         self::$errorno = $stmt->errno;
 498                                         $retval = false;
 499                                         break;
 500                                 }
 501
 502                                 $param_types = '';
 503                                 $values = [];
 504                                 foreach ($args AS $param => $value) {
 505                                         if (is_int($args[$param])) {
 506                                                 $param_types .= 'i';
 507                                         } elseif (is_float($args[$param])) {
 508                                                 $param_types .= 'd';
 509                                         } elseif (is_string($args[$param])) {
 510                                                 $param_types .= 's';
 511                                         } else {
 512                                                 $param_types .= 'b';
 513                                         }
 514                                         $values[] = &$args[$param];
 515                                 }
 516
 517                                 if (count($values) > 0) {
 518                                         array_unshift($values, $param_types);
 519                                         call_user_func_array([$stmt, 'bind_param'], $values);
 520                                 }
 521
 522                                 if (!$stmt->execute()) {
 523                                         self::$error = self::$connection->error;
 524                                         self::$errorno = self::$connection->errno;
 525                                         $retval = false;
 526                                 } else {
 527                                         $stmt->store_result();
 528                                         $retval = $stmt;
 529                                         self::$affected_rows = $retval->affected_rows;
 530                                 }
 531                                 break;
 532                 }
 533
 534                 // We are having an own error logging in the function "e"
 535                 if ((self::$errorno != 0) && !$called_from_e) {
 536                         // We have to preserve the error code, somewhere in the logging it get lost
 537                         $error = self::$error;
 538                         $errorno = self::$errorno;
 539
 540                         logger('DB Error '.self::$errorno.': '.self::$error."\n".
 541                                 System::callstack(8)."\n".self::replaceParameters($sql, $args));
 542
 543                         // On a lost connection we try to reconnect - but only once.
 544                         if ($errorno == 2006) {
 545                                 if (self::$in_retrial || !self::reconnect()) {
 546                                         // It doesn't make sense to continue when the database connection was lost
 547                                         if (self::$in_retrial) {
 548                                                 logger('Giving up retrial because of database error '.$errorno.': '.$error);
 549                                         } else {
 550                                                 logger("Couldn't reconnect after database error ".$errorno.': '.$error);
 551                                         }
 552                                         exit(1);
 553                                 } else {
 554                                         // We try it again
 555                                         logger('Reconnected after database error '.$errorno.': '.$error);
 556                                         self::$in_retrial = true;
 557                                         $ret = self::p($sql, $args);
 558                                         self::$in_retrial = false;
 559                                         return $ret;
 560                                 }
 561                         }
 562
 563                         self::$error = $error;
 564                         self::$errorno = $errorno;
 565                 }
 566
 567                 $a->save_timestamp($stamp1, 'database');
 568
 569                 if ($a->getConfigValue('system', 'db_log')) {
 570                         $stamp2 = microtime(true);
 571                         $duration = (float)($stamp2 - $stamp1);
 572
 573                         if (($duration > $a->getConfigValue('system', 'db_loglimit'))) {
 574                                 $duration = round($duration, 3);
 575                                 $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
 576
 577                                 @file_put_contents($a->getConfigValue('system', 'db_log'), DateTimeFormat::utcNow()."\t".$duration."\t".
 578                                                 basename($backtrace[1]["file"])."\t".
 579                                                 $backtrace[1]["line"]."\t".$backtrace[2]["function"]."\t".
 580                                                 substr(self::replaceParameters($sql, $args), 0, 2000)."\n", FILE_APPEND);
 581                         }
 582                 }
 583                 return $retval;
 584         }
 585
 586         /**
 587          * @brief Executes a prepared statement like UPDATE or INSERT that doesn't return data
 588          *
 589          * Please use dba::delete, dba::insert, dba::update, ... instead
 590          *
 591          * @param string $sql SQL statement
 592          * @return boolean Was the query successfull? False is returned only if an error occurred
 593          */
 594         public static function e($sql) {
 595                 $a = get_app();
 596
 597                 $stamp = microtime(true);
 598
 599                 $params = self::getParam(func_get_args());
 600
 601                 // In a case of a deadlock we are repeating the query 20 times
 602                 $timeout = 20;
 603
 604                 do {
 605                         $stmt = self::p($sql, $params);
 606
 607                         if (is_bool($stmt)) {
 608                                 $retval = $stmt;
 609                         } elseif (is_object($stmt)) {
 610                                 $retval = true;
 611                         } else {
 612                                 $retval = false;
 613                         }
 614
 615                         self::close($stmt);
 616
 617                 } while ((self::$errorno == 1213) && (--$timeout > 0));
 618
 619                 if (self::$errorno != 0) {
 620                         // We have to preserve the error code, somewhere in the logging it get lost
 621                         $error = self::$error;
 622                         $errorno = self::$errorno;
 623
 624                         logger('DB Error '.self::$errorno.': '.self::$error."\n".
 625                                 System::callstack(8)."\n".self::replaceParameters($sql, $params));
 626
 627                         // On a lost connection we simply quit.
 628                         // A reconnect like in self::p could be dangerous with modifications
 629                         if ($errorno == 2006) {
 630                                 logger('Giving up because of database error '.$errorno.': '.$error);
 631                                 exit(1);
 632                         }
 633
 634                         self::$error = $error;
 635                         self::$errorno = $errorno;
 636                 }
 637
 638                 $a->save_timestamp($stamp, "database_write");
 639
 640                 return $retval;
 641         }
 642
 643         /**
 644          * @brief Check if data exists
 645          *
 646          * @param string $table Table name
 647          * @param array $condition array of fields for condition
 648          *
 649          * @return boolean Are there rows for that condition?
 650          */
 651         public static function exists($table, $condition) {
 652                 if (empty($table)) {
 653                         return false;
 654                 }
 655
 656                 $fields = [];
 657
 658                 if (empty($condition)) {
 659                         return DBStructure::existsTable($table);
 660                 }
 661
 662                 reset($condition);
 663                 $first_key = key($condition);
 664                 if (!is_int($first_key)) {
 665                         $fields = [$first_key];
 666                 }
 667
 668                 $stmt = self::select($table, $fields, $condition, ['limit' => 1]);
 669
 670                 if (is_bool($stmt)) {
 671                         $retval = $stmt;
 672                 } else {
 673                         $retval = (self::numRows($stmt) > 0);
 674                 }
 675
 676                 self::close($stmt);
 677
 678                 return $retval;
 679         }
 680
 681         /**
 682          * Fetches the first row
 683          *
 684          * Please use dba::selectFirst or dba::exists whenever this is possible.
 685          *
 686          * @brief Fetches the first row
 687          * @param string $sql SQL statement
 688          * @return array first row of query
 689          */
 690         public static function fetchFirst($sql) {
 691                 $params = self::getParam(func_get_args());
 692
 693                 $stmt = self::p($sql, $params);
 694
 695                 if (is_bool($stmt)) {
 696                         $retval = $stmt;
 697                 } else {
 698                         $retval = self::fetch($stmt);
 699                 }
 700
 701                 self::close($stmt);
 702
 703                 return $retval;
 704         }
 705
 706         /**
 707          * @brief Returns the number of affected rows of the last statement
 708          *
 709          * @return int Number of rows
 710          */
 711         public static function affectedRows() {
 712                 return self::$affected_rows;
 713         }
 714
 715         /**
 716          * @brief Returns the number of columns of a statement
 717          *
 718          * @param object Statement object
 719          * @return int Number of columns
 720          */
 721         public static function columnCount($stmt) {
 722                 if (!is_object($stmt)) {
 723                         return 0;
 724                 }
 725                 switch (self::$driver) {
 726                         case 'pdo':
 727                                 return $stmt->columnCount();
 728                         case 'mysqli':
 729                                 return $stmt->field_count;
 730                 }
 731                 return 0;
 732         }
 733         /**
 734          * @brief Returns the number of rows of a statement
 735          *
 736          * @param PDOStatement|mysqli_result|mysqli_stmt Statement object
 737          * @return int Number of rows
 738          */
 739         public static function numRows($stmt) {
 740                 if (!is_object($stmt)) {
 741                         return 0;
 742                 }
 743                 switch (self::$driver) {
 744                         case 'pdo':
 745                                 return $stmt->rowCount();
 746                         case 'mysqli':
 747                                 return $stmt->num_rows;
 748                 }
 749                 return 0;
 750         }
 751
 752         /**
 753          * @brief Fetch a single row
 754          *
 755          * @param mixed $stmt statement object
 756          * @return array current row
 757          */
 758         public static function fetch($stmt) {
 759                 $a = get_app();
 760
 761                 $stamp1 = microtime(true);
 762
 763                 $columns = [];
 764
 765                 if (!is_object($stmt)) {
 766                         return false;
 767                 }
 768
 769                 switch (self::$driver) {
 770                         case 'pdo':
 771                                 $columns = $stmt->fetch(PDO::FETCH_ASSOC);
 772                                 break;
 773                         case 'mysqli':
 774                                 if (get_class($stmt) == 'mysqli_result') {
 775                                         $columns = $stmt->fetch_assoc();
 776                                         break;
 777                                 }
 778
 779                                 // This code works, but is slow
 780
 781                                 // Bind the result to a result array
 782                                 $cols = [];
 783
 784                                 $cols_num = [];
 785                                 for ($x = 0; $x < $stmt->field_count; $x++) {
 786                                         $cols[] = &$cols_num[$x];
 787                                 }
 788
 789                                 call_user_func_array([$stmt, 'bind_result'], $cols);
 790
 791                                 if (!$stmt->fetch()) {
 792                                         return false;
 793                                 }
 794
 795                                 // The slow part:
 796                                 // We need to get the field names for the array keys
 797                                 // It seems that there is no better way to do this.
 798                                 $result = $stmt->result_metadata();
 799                                 $fields = $result->fetch_fields();
 800
 801                                 foreach ($cols_num AS $param => $col) {
 802                                         $columns[$fields[$param]->name] = $col;
 803                                 }
 804                 }
 805
 806                 $a->save_timestamp($stamp1, 'database');
 807
 808                 return $columns;
 809         }
 810
 811         /**
 812          * @brief Insert a row into a table
 813          *
 814          * @param string $table Table name
 815          * @param array $param parameter array
 816          * @param bool $on_duplicate_update Do an update on a duplicate entry
 817          *
 818          * @return boolean was the insert successfull?
 819          */
 820         public static function insert($table, $param, $on_duplicate_update = false) {
 821
 822                 if (empty($table) || empty($param)) {
 823                         logger('Table and fields have to be set');
 824                         return false;
 825                 }
 826
 827                 $sql = "INSERT INTO `".self::escape($table)."` (`".implode("`, `", array_keys($param))."`) VALUES (".
 828                         substr(str_repeat("?, ", count($param)), 0, -2).")";
 829
 830                 if ($on_duplicate_update) {
 831                         $sql .= " ON DUPLICATE KEY UPDATE `".implode("` = ?, `", array_keys($param))."` = ?";
 832
 833                         $values = array_values($param);
 834                         $param = array_merge_recursive($values, $values);
 835                 }
 836
 837                 return self::e($sql, $param);
 838         }
 839
 840         /**
 841          * @brief Fetch the id of the last insert command
 842          *
 843          * @return integer Last inserted id
 844          */
 845         public static function lastInsertId() {
 846                 switch (self::$driver) {
 847                         case 'pdo':
 848                                 $id = self::$connection->lastInsertId();
 849                                 break;
 850                         case 'mysqli':
 851                                 $id = self::$connection->insert_id;
 852                                 break;
 853                 }
 854                 return $id;
 855         }
 856
 857         /**
 858          * @brief Locks a table for exclusive write access
 859          *
 860          * This function can be extended in the future to accept a table array as well.
 861          *
 862          * @param string $table Table name
 863          *
 864          * @return boolean was the lock successful?
 865          */
 866         public static function lock($table) {
 867                 // See here: https://dev.mysql.com/doc/refman/5.7/en/lock-tables-and-transactions.html
 868                 if (self::$driver == 'pdo') {
 869                         self::e("SET autocommit=0");
 870                         self::$connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, true);
 871                 } else {
 872                         self::$connection->autocommit(false);
 873                 }
 874
 875                 $success = self::e("LOCK TABLES `".self::escape($table)."` WRITE");
 876
 877                 if (self::$driver == 'pdo') {
 878                         self::$connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
 879                 }
 880
 881                 if (!$success) {
 882                         if (self::$driver == 'pdo') {
 883                                 self::e("SET autocommit=1");
 884                         } else {
 885                                 self::$connection->autocommit(true);
 886                         }
 887                 } else {
 888                         self::$in_transaction = true;
 889                 }
 890                 return $success;
 891         }
 892
 893         /**
 894          * @brief Unlocks all locked tables
 895          *
 896          * @return boolean was the unlock successful?
 897          */
 898         public static function unlock() {
 899                 // See here: https://dev.mysql.com/doc/refman/5.7/en/lock-tables-and-transactions.html
 900                 self::performCommit();
 901
 902                 if (self::$driver == 'pdo') {
 903                         self::$connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, true);
 904                 }
 905
 906                 $success = self::e("UNLOCK TABLES");
 907
 908                 if (self::$driver == 'pdo') {
 909                         self::$connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
 910                         self::e("SET autocommit=1");
 911                 } else {
 912                         self::$connection->autocommit(true);
 913                 }
 914
 915                 self::$in_transaction = false;
 916                 return $success;
 917         }
 918
 919         /**
 920          * @brief Starts a transaction
 921          *
 922          * @return boolean Was the command executed successfully?
 923          */
 924         public static function transaction() {
 925                 if (!self::performCommit()) {
 926                         return false;
 927                 }
 928
 929                 switch (self::$driver) {
 930                         case 'pdo':
 931                                 if (self::$connection->inTransaction()) {
 932                                         break;
 933                                 }
 934                                 if (!self::$connection->beginTransaction()) {
 935                                         return false;
 936                                 }
 937                                 break;
 938                         case 'mysqli':
 939                                 if (!self::$connection->begin_transaction()) {
 940                                         return false;
 941                                 }
 942                                 break;
 943                 }
 944
 945                 self::$in_transaction = true;
 946                 return true;
 947         }
 948
 949         private static function performCommit()
 950         {
 951                 switch (self::$driver) {
 952                         case 'pdo':
 953                                 if (!self::$connection->inTransaction()) {
 954                                         return true;
 955                                 }
 956                                 return self::$connection->commit();
 957                         case 'mysqli':
 958                                 return self::$connection->commit();
 959                 }
 960                 return true;
 961         }
 962
 963         /**
 964          * @brief Does a commit
 965          *
 966          * @return boolean Was the command executed successfully?
 967          */
 968         public static function commit() {
 969                 if (!self::performCommit()) {
 970                         return false;
 971                 }
 972                 self::$in_transaction = false;
 973                 return true;
 974         }
 975
 976         /**
 977          * @brief Does a rollback
 978          *
 979          * @return boolean Was the command executed successfully?
 980          */
 981         public static function rollback() {
 982                 $ret = false;
 983
 984                 switch (self::$driver) {
 985                         case 'pdo':
 986                                 if (!self::$connection->inTransaction()) {
 987                                         $ret = true;
 988                                         break;
 989                                 }
 990                                 $ret = self::$connection->rollBack();
 991                                 break;
 992                         case 'mysqli':
 993                                 $ret = self::$connection->rollback();
 994                                 break;
 995                 }
 996                 self::$in_transaction = false;
 997                 return $ret;
 998         }
 999
1000         /**
1001          * @brief Build the array with the table relations
1002          *
1003          * The array is build from the database definitions in DBStructure.php
1004          *
1005          * This process must only be started once, since the value is cached.
1006          */
1007         private static function buildRelationData() {
1008                 $definition = DBStructure::definition();
1009
1010                 foreach ($definition AS $table => $structure) {
1011                         foreach ($structure['fields'] AS $field => $field_struct) {
1012                                 if (isset($field_struct['relation'])) {
1013                                         foreach ($field_struct['relation'] AS $rel_table => $rel_field) {
1014                                                 self::$relation[$rel_table][$rel_field][$table][] = $field;
1015                                         }
1016                                 }
1017                         }
1018                 }
1019         }
1020
1021         /**
1022          * @brief Delete a row from a table
1023          *
1024          * @param string  $table       Table name
1025          * @param array   $conditions  Field condition(s)
1026          * @param array   $options
1027          *                - cascade: If true we delete records in other tables that depend on the one we're deleting through
1028          *                           relations (default: true)
1029          * @param boolean $in_process  Internal use: Only do a commit after the last delete
1030          * @param array   $callstack   Internal use: prevent endless loops
1031          *
1032          * @return boolean|array was the delete successful? When $in_process is set: deletion data
1033          */
1034         public static function delete($table, array $conditions, array $options = [], $in_process = false, array &$callstack = [])
1035         {
1036                 if (empty($table) || empty($conditions)) {
1037                         logger('Table and conditions have to be set');
1038                         return false;
1039                 }
1040
1041                 $commands = [];
1042
1043                 // Create a key for the loop prevention
1044                 $key = $table . ':' . json_encode($conditions);
1045
1046                 // We quit when this key already exists in the callstack.
1047                 if (isset($callstack[$key])) {
1048                         return $commands;
1049                 }
1050
1051                 $callstack[$key] = true;
1052
1053                 $table = self::escape($table);
1054
1055                 $commands[$key] = ['table' => $table, 'conditions' => $conditions];
1056
1057                 $cascade = defaults($options, 'cascade', true);
1058
1059                 // To speed up the whole process we cache the table relations
1060                 if ($cascade && count(self::$relation) == 0) {
1061                         self::buildRelationData();
1062                 }
1063
1064                 // Is there a relation entry for the table?
1065                 if ($cascade && isset(self::$relation[$table])) {
1066                         // We only allow a simple "one field" relation.
1067                         $field = array_keys(self::$relation[$table])[0];
1068                         $rel_def = array_values(self::$relation[$table])[0];
1069
1070                         // Create a key for preventing double queries
1071                         $qkey = $field . '-' . $table . ':' . json_encode($conditions);
1072
1073                         // When the search field is the relation field, we don't need to fetch the rows
1074                         // This is useful when the leading record is already deleted in the frontend but the rest is done in the backend
1075                         if ((count($conditions) == 1) && ($field == array_keys($conditions)[0])) {
1076                                 foreach ($rel_def AS $rel_table => $rel_fields) {
1077                                         foreach ($rel_fields AS $rel_field) {
1078                                                 $retval = self::delete($rel_table, [$rel_field => array_values($conditions)[0]], $options, true, $callstack);
1079                                                 $commands = array_merge($commands, $retval);
1080                                         }
1081                                 }
1082                                 // We quit when this key already exists in the callstack.
1083                         } elseif (!isset($callstack[$qkey])) {
1084
1085                                 $callstack[$qkey] = true;
1086
1087                                 // Fetch all rows that are to be deleted
1088                                 $data = self::select($table, [$field], $conditions);
1089
1090                                 while ($row = self::fetch($data)) {
1091                                         // Now we accumulate the delete commands
1092                                         $retval = self::delete($table, [$field => $row[$field]], $options, true, $callstack);
1093                                         $commands = array_merge($commands, $retval);
1094                                 }
1095
1096                                 self::close($data);
1097
1098                                 // Since we had split the delete command we don't need the original command anymore
1099                                 unset($commands[$key]);
1100                         }
1101                 }
1102
1103                 if (!$in_process) {
1104                         // Now we finalize the process
1105                         $do_transaction = !self::$in_transaction;
1106
1107                         if ($do_transaction) {
1108                                 self::transaction();
1109                         }
1110
1111                         $compacted = [];
1112                         $counter = [];
1113
1114                         foreach ($commands AS $command) {
1115                                 $conditions = $command['conditions'];
1116                                 reset($conditions);
1117                                 $first_key = key($conditions);
1118
1119                                 $condition_string = self::buildCondition($conditions);
1120
1121                                 if ((count($command['conditions']) > 1) || is_int($first_key)) {
1122                                         $sql = "DELETE FROM `" . $command['table'] . "`" . $condition_string;
1123                                         logger(self::replaceParameters($sql, $conditions), LOGGER_DATA);
1124
1125                                         if (!self::e($sql, $conditions)) {
1126                                                 if ($do_transaction) {
1127                                                         self::rollback();
1128                                                 }
1129                                                 return false;
1130                                         }
1131                                 } else {
1132                                         $key_table = $command['table'];
1133                                         $key_condition = array_keys($command['conditions'])[0];
1134                                         $value = array_values($command['conditions'])[0];
1135
1136                                         // Split the SQL queries in chunks of 100 values
1137                                         // We do the $i stuff here to make the code better readable
1138                                         $i = isset($counter[$key_table][$key_condition]) ? $counter[$key_table][$key_condition] : 0;
1139                                         if (isset($compacted[$key_table][$key_condition][$i]) && count($compacted[$key_table][$key_condition][$i]) > 100) {
1140                                                 ++$i;
1141                                         }
1142
1143                                         $compacted[$key_table][$key_condition][$i][$value] = $value;
1144                                         $counter[$key_table][$key_condition] = $i;
1145                                 }
1146                         }
1147                         foreach ($compacted AS $table => $values) {
1148                                 foreach ($values AS $field => $field_value_list) {
1149                                         foreach ($field_value_list AS $field_values) {
1150                                                 $sql = "DELETE FROM `" . $table . "` WHERE `" . $field . "` IN (" .
1151                                                         substr(str_repeat("?, ", count($field_values)), 0, -2) . ");";
1152
1153                                                 logger(self::replaceParameters($sql, $field_values), LOGGER_DATA);
1154
1155                                                 if (!self::e($sql, $field_values)) {
1156                                                         if ($do_transaction) {
1157                                                                 self::rollback();
1158                                                         }
1159                                                         return false;
1160                                                 }
1161                                         }
1162                                 }
1163                         }
1164                         if ($do_transaction) {
1165                                 self::commit();
1166                         }
1167                         return true;
1168                 }
1169
1170                 return $commands;
1171         }
1172
1173         /**
1174          * @brief Updates rows
1175          *
1176          * Updates rows in the database. When $old_fields is set to an array,
1177          * the system will only do an update if the fields in that array changed.
1178          *
1179          * Attention:
1180          * Only the values in $old_fields are compared.
1181          * This is an intentional behaviour.
1182          *
1183          * Example:
1184          * We include the timestamp field in $fields but not in $old_fields.
1185          * Then the row will only get the new timestamp when the other fields had changed.
1186          *
1187          * When $old_fields is set to a boolean value the system will do this compare itself.
1188          * When $old_fields is set to "true" the system will do an insert if the row doesn't exists.
1189          *
1190          * Attention:
1191          * Only set $old_fields to a boolean value when you are sure that you will update a single row.
1192          * When you set $old_fields to "true" then $fields must contain all relevant fields!
1193          *
1194          * @param string $table Table name
1195          * @param array $fields contains the fields that are updated
1196          * @param array $condition condition array with the key values
1197          * @param array|boolean $old_fields array with the old field values that are about to be replaced (true = update on duplicate)
1198          *
1199          * @return boolean was the update successfull?
1200          */
1201         public static function update($table, $fields, $condition, $old_fields = []) {
1202
1203                 if (empty($table) || empty($fields) || empty($condition)) {
1204                         logger('Table, fields and condition have to be set');
1205                         return false;
1206                 }
1207
1208                 $table = self::escape($table);
1209
1210                 $condition_string = self::buildCondition($condition);
1211
1212                 if (is_bool($old_fields)) {
1213                         $do_insert = $old_fields;
1214
1215                         $old_fields = self::selectFirst($table, [], $condition);
1216
1217                         if (is_bool($old_fields)) {
1218                                 if ($do_insert) {
1219                                         $values = array_merge($condition, $fields);
1220                                         return self::insert($table, $values, $do_insert);
1221                                 }
1222                                 $old_fields = [];
1223                         }
1224                 }
1225
1226                 $do_update = (count($old_fields) == 0);
1227
1228                 foreach ($old_fields AS $fieldname => $content) {
1229                         if (isset($fields[$fieldname])) {
1230                                 if ($fields[$fieldname] == $content) {
1231                                         unset($fields[$fieldname]);
1232                                 } else {
1233                                         $do_update = true;
1234                                 }
1235                         }
1236                 }
1237
1238                 if (!$do_update || (count($fields) == 0)) {
1239                         return true;
1240                 }
1241
1242                 $sql = "UPDATE `".$table."` SET `".
1243                         implode("` = ?, `", array_keys($fields))."` = ?".$condition_string;
1244
1245                 $params1 = array_values($fields);
1246                 $params2 = array_values($condition);
1247                 $params = array_merge_recursive($params1, $params2);
1248
1249                 return self::e($sql, $params);
1250         }
1251
1252         /**
1253          * Retrieve a single record from a table and returns it in an associative array
1254          *
1255          * @brief Retrieve a single record from a table
1256          * @param string $table
1257          * @param array  $fields
1258          * @param array  $condition
1259          * @param array  $params
1260          * @return bool|array
1261          * @see self::select
1262          */
1263         public static function selectFirst($table, array $fields = [], array $condition = [], $params = [])
1264         {
1265                 $params['limit'] = 1;
1266                 $result = self::select($table, $fields, $condition, $params);
1267
1268                 if (is_bool($result)) {
1269                         return $result;
1270                 } else {
1271                         $row = self::fetch($result);
1272                         self::close($result);
1273                         return $row;
1274                 }
1275         }
1276
1277         /**
1278          * @brief Select rows from a table
1279          *
1280          * @param string $table     Table name
1281          * @param array  $fields    Array of selected fields, empty for all
1282          * @param array  $condition Array of fields for condition
1283          * @param array  $params    Array of several parameters
1284          *
1285          * @return boolean|object
1286          *
1287          * Example:
1288          * $table = "item";
1289          * $fields = array("id", "uri", "uid", "network");
1290          *
1291          * $condition = array("uid" => 1, "network" => 'dspr');
1292          * or:
1293          * $condition = array("`uid` = ? AND `network` IN (?, ?)", 1, 'dfrn', 'dspr');
1294          *
1295          * $params = array("order" => array("id", "received" => true), "limit" => 10);
1296          *
1297          * $data = dba::select($table, $fields, $condition, $params);
1298          */
1299         public static function select($table, array $fields = [], array $condition = [], array $params = [])
1300         {
1301                 if ($table == '') {
1302                         return false;
1303                 }
1304
1305                 $table = self::escape($table);
1306
1307                 if (count($fields) > 0) {
1308                         $select_fields = "`" . implode("`, `", array_values($fields)) . "`";
1309                 } else {
1310                         $select_fields = "*";
1311                 }
1312
1313                 $condition_string = self::buildCondition($condition);
1314
1315                 $param_string = self::buildParameter($params);
1316
1317                 $sql = "SELECT " . $select_fields . " FROM `" . $table . "`" . $condition_string . $param_string;
1318
1319                 $result = self::p($sql, $condition);
1320
1321                 return $result;
1322         }
1323
1324         /**
1325          * @brief Counts the rows from a table satisfying the provided condition
1326          *
1327          * @param string $table Table name
1328          * @param array $condition array of fields for condition
1329          *
1330          * @return int
1331          *
1332          * Example:
1333          * $table = "item";
1334          *
1335          * $condition = ["uid" => 1, "network" => 'dspr'];
1336          * or:
1337          * $condition = ["`uid` = ? AND `network` IN (?, ?)", 1, 'dfrn', 'dspr'];
1338          *
1339          * $count = dba::count($table, $condition);
1340          */
1341         public static function count($table, array $condition = [])
1342         {
1343                 if ($table == '') {
1344                         return false;
1345                 }
1346
1347                 $condition_string = self::buildCondition($condition);
1348
1349                 $sql = "SELECT COUNT(*) AS `count` FROM `".$table."`".$condition_string;
1350
1351                 $row = self::fetchFirst($sql, $condition);
1352
1353                 return $row['count'];
1354         }
1355
1356         /**
1357          * @brief Returns the SQL condition string built from the provided condition array
1358          *
1359          * This function operates with two modes.
1360          * - Supplied with a filed/value associative array, it builds simple strict
1361          *   equality conditions linked by AND.
1362          * - Supplied with a flat list, the first element is the condition string and
1363          *   the following arguments are the values to be interpolated
1364          *
1365          * $condition = ["uid" => 1, "network" => 'dspr'];
1366          * or:
1367          * $condition = ["`uid` = ? AND `network` IN (?, ?)", 1, 'dfrn', 'dspr'];
1368          *
1369          * In either case, the provided array is left with the parameters only
1370          *
1371          * @param array $condition
1372          * @return string
1373          */
1374         public static function buildCondition(array &$condition = [])
1375         {
1376                 $condition_string = '';
1377                 if (count($condition) > 0) {
1378                         reset($condition);
1379                         $first_key = key($condition);
1380                         if (is_int($first_key)) {
1381                                 $condition_string = " WHERE (" . array_shift($condition) . ")";
1382                         } else {
1383                                 $new_values = [];
1384                                 $condition_string = "";
1385                                 foreach ($condition as $field => $value) {
1386                                         if ($condition_string != "") {
1387                                                 $condition_string .= " AND ";
1388                                         }
1389                                         if (is_array($value)) {
1390                                                 /* Workaround for MySQL Bug #64791.
1391                                                  * Never mix data types inside any IN() condition.
1392                                                  * In case of mixed types, cast all as string.
1393                                                  * Logic needs to be consistent with dba::p() data types.
1394                                                  */
1395                                                 $is_int = false;
1396                                                 $is_alpha = false;
1397                                                 foreach ($value as $single_value) {
1398                                                         if (is_int($single_value)) {
1399                                                                 $is_int = true;
1400                                                         } else {
1401                                                                 $is_alpha = true;
1402                                                         }
1403                                                 }
1404
1405                                                 if ($is_int && $is_alpha) {
1406                                                         foreach ($value as &$ref) {
1407                                                                 if (is_int($ref)) {
1408                                                                         $ref = (string)$ref;
1409                                                                 }
1410                                                         }
1411                                                         unset($ref); //Prevent accidental re-use.
1412                                                 }
1413
1414                                                 $new_values = array_merge($new_values, array_values($value));
1415                                                 $placeholders = substr(str_repeat("?, ", count($value)), 0, -2);
1416                                                 $condition_string .= "`" . $field . "` IN (" . $placeholders . ")";
1417                                         } else {
1418                                                 $new_values[$field] = $value;
1419                                                 $condition_string .= "`" . $field . "` = ?";
1420                                         }
1421                                 }
1422                                 $condition_string = " WHERE (" . $condition_string . ")";
1423                                 $condition = $new_values;
1424                         }
1425                 }
1426
1427                 return $condition_string;
1428         }
1429
1430         /**
1431          * @brief Returns the SQL parameter string built from the provided parameter array
1432          *
1433          * @param array $params
1434          * @return string
1435          */
1436         public static function buildParameter(array $params = [])
1437         {
1438                 $order_string = '';
1439                 if (isset($params['order'])) {
1440                         $order_string = " ORDER BY ";
1441                         foreach ($params['order'] AS $fields => $order) {
1442                                 if (!is_int($fields)) {
1443                                         $order_string .= "`" . $fields . "` " . ($order ? "DESC" : "ASC") . ", ";
1444                                 } else {
1445                                         $order_string .= "`" . $order . "`, ";
1446                                 }
1447                         }
1448                         $order_string = substr($order_string, 0, -2);
1449                 }
1450
1451                 $limit_string = '';
1452                 if (isset($params['limit']) && is_int($params['limit'])) {
1453                         $limit_string = " LIMIT " . $params['limit'];
1454                 }
1455
1456                 if (isset($params['limit']) && is_array($params['limit'])) {
1457                         $limit_string = " LIMIT " . intval($params['limit'][0]) . ", " . intval($params['limit'][1]);
1458                 }
1459
1460                 return $order_string.$limit_string;
1461         }
1462
1463         /**
1464          * @brief Fills an array with data from a query
1465          *
1466          * @param object $stmt statement object
1467          * @return array Data array
1468          */
1469         public static function toArray($stmt, $do_close = true) {
1470                 if (is_bool($stmt)) {
1471                         return $stmt;
1472                 }
1473
1474                 $data = [];
1475                 while ($row = self::fetch($stmt)) {
1476                         $data[] = $row;
1477                 }
1478                 if ($do_close) {
1479                         self::close($stmt);
1480                 }
1481                 return $data;
1482         }
1483
1484         /**
1485          * @brief Returns the error number of the last query
1486          *
1487          * @return string Error number (0 if no error)
1488          */
1489         public static function errorNo() {
1490                 return self::$errorno;
1491         }
1492
1493         /**
1494          * @brief Returns the error message of the last query
1495          *
1496          * @return string Error message ('' if no error)
1497          */
1498         public static function errorMessage() {
1499                 return self::$error;
1500         }
1501
1502         /**
1503          * @brief Closes the current statement
1504          *
1505          * @param object $stmt statement object
1506          * @return boolean was the close successful?
1507          */
1508         public static function close($stmt) {
1509                 $a = get_app();
1510
1511                 $stamp1 = microtime(true);
1512
1513                 if (!is_object($stmt)) {
1514                         return false;
1515                 }
1516
1517                 switch (self::$driver) {
1518                         case 'pdo':
1519                                 $ret = $stmt->closeCursor();
1520                                 break;
1521                         case 'mysqli':
1522                                 // MySQLi offers both a mysqli_stmt and a mysqli_result class.
1523                                 // We should be careful not to assume the object type of $stmt
1524                                 // because dba::p() has been able to return both types.
1525                                 if ($stmt instanceof mysqli_stmt) {
1526                                         $stmt->free_result();
1527                                         $ret = $stmt->close();
1528                                 } elseif ($stmt instanceof mysqli_result) {
1529                                         $stmt->free();
1530                                         $ret = true;
1531                                 } else {
1532                                         $ret = false;
1533                                 }
1534                                 break;
1535                 }
1536
1537                 $a->save_timestamp($stamp1, 'database');
1538
1539                 return $ret;
1540         }
1541
1542         /**
1543          * @brief Return a list of database processes
1544          *
1545          * @return array
1546          *      'list' => List of processes, separated in their different states
1547          *      'amount' => Number of concurrent database processes
1548          */
1549         public static function processlist()
1550         {
1551                 $ret = self::p("SHOW PROCESSLIST");
1552                 $data = self::toArray($ret);
1553
1554                 $s = [];
1555
1556                 $processes = 0;
1557                 $states = [];
1558                 foreach ($data as $process) {
1559                         $state = trim($process["State"]);
1560
1561                         // Filter out all non blocking processes
1562                         if (!in_array($state, ["", "init", "statistics", "updating"])) {
1563                                 ++$states[$state];
1564                                 ++$processes;
1565                         }
1566                 }
1567
1568                 $statelist = "";
1569                 foreach ($states as $state => $usage) {
1570                         if ($statelist != "") {
1571                                 $statelist .= ", ";
1572                         }
1573                         $statelist .= $state.": ".$usage;
1574                 }
1575                 return(["list" => $statelist, "amount" => $processes]);
1576         }
1577
1578         /**
1579          * Checks if $array is a filled array with at least one entry.
1580          *
1581          * @param mixed $array A filled array with at least one entry
1582          *
1583          * @return boolean Whether $array is a filled array or an object with rows
1584          */
1585         public static function is_result($array)
1586         {
1587                 // It could be a return value from an update statement
1588                 if (is_bool($array)) {
1589                         return $array;
1590                 }
1591
1592                 if (is_object($array)) {
1593                         return self::numRows($array) > 0;
1594                 }
1595
1596                 return (is_array($array) && (count($array) > 0));
1597         }
1598
1599         /**
1600          * @brief Callback function for "esc_array"
1601          *
1602          * @param mixed   $value         Array value
1603          * @param string  $key           Array key
1604          * @param boolean $add_quotation add quotation marks for string values
1605          * @return void
1606          */
1607         private static function esc_array_callback(&$value, $key, $add_quotation)
1608         {
1609                 if (!$add_quotation) {
1610                         if (is_bool($value)) {
1611                                 $value = ($value ? '1' : '0');
1612                         } else {
1613                                 $value = dbesc($value);
1614                         }
1615                         return;
1616                 }
1617
1618                 if (is_bool($value)) {
1619                         $value = ($value ? 'true' : 'false');
1620                 } elseif (is_float($value) || is_integer($value)) {
1621                         $value = (string) $value;
1622                 } else {
1623                         $value = "'" . dbesc($value) . "'";
1624                 }
1625         }
1626
1627         /**
1628          * @brief Escapes a whole array
1629          *
1630          * @param mixed   $arr           Array with values to be escaped
1631          * @param boolean $add_quotation add quotation marks for string values
1632          * @return void
1633          */
1634         public static function esc_array(&$arr, $add_quotation = false)
1635         {
1636                 array_walk($arr, 'self::esc_array_callback', $add_quotation);
1637         }
1638 }