include/dba.php

   1 <?php
   2
   3 use Friendica\App;
   4 use Friendica\Core\L10n;
   5 use Friendica\Core\System;
   6 use Friendica\Database\DBM;
   7 use Friendica\Database\DBStructure;
   8 use Friendica\Util\DateTimeFormat;
   9
  10 /**
  11  * @class MySQL database class
  12  *
  13  * This class is for the low level database stuff that does driver specific things.
  14  */
  15
  16 class dba {
  17         public static $connected = false;
  18
  19         private static $_server_info = '';
  20         private static $db;
  21         private static $driver;
  22         private static $error = false;
  23         private static $errorno = 0;
  24         private static $affected_rows = 0;
  25         private static $in_transaction = false;
  26         private static $in_retrial = false;
  27         private static $relation = [];
  28         private static $db_serveraddr = '';
  29         private static $db_user = '';
  30         private static $db_pass = '';
  31         private static $db_name = '';
  32         private static $db_charset = '';
  33
  34         public static function connect($serveraddr, $user, $pass, $db, $charset = null)
  35         {
  36                 if (!is_null(self::$db) && self::connected()) {
  37                         return true;
  38                 }
  39
  40                 // We are storing these values for being able to perform a reconnect
  41                 self::$db_serveraddr = $serveraddr;
  42                 self::$db_user = $user;
  43                 self::$db_pass = $pass;
  44                 self::$db_name = $db;
  45                 self::$db_charset = $charset;
  46
  47                 $serveraddr = trim($serveraddr);
  48
  49                 $serverdata = explode(':', $serveraddr);
  50                 $server = $serverdata[0];
  51
  52                 if (count($serverdata) > 1) {
  53                         $port = trim($serverdata[1]);
  54                 }
  55
  56                 $server = trim($server);
  57                 $user = trim($user);
  58                 $pass = trim($pass);
  59                 $db = trim($db);
  60                 $charset = trim($charset);
  61
  62                 if (!(strlen($server) && strlen($user))) {
  63                         return false;
  64                 }
  65
  66                 if (class_exists('\PDO') && in_array('mysql', PDO::getAvailableDrivers())) {
  67                         self::$driver = 'pdo';
  68                         $connect = "mysql:host=".$server.";dbname=".$db;
  69
  70                         if (isset($port)) {
  71                                 $connect .= ";port=".$port;
  72                         }
  73
  74                         if ($charset) {
  75                                 $connect .= ";charset=".$charset;
  76                         }
  77
  78                         try {
  79                                 self::$db = @new PDO($connect, $user, $pass);
  80                                 self::$db->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
  81                                 self::$connected = true;
  82                         } catch (PDOException $e) {
  83                         }
  84                 }
  85
  86                 if (!self::$connected && class_exists('mysqli')) {
  87                         self::$driver = 'mysqli';
  88                         self::$db = @new mysqli($server, $user, $pass, $db, $port);
  89                         if (!mysqli_connect_errno()) {
  90                                 self::$connected = true;
  91
  92                                 if ($charset) {
  93                                         self::$db->set_charset($charset);
  94                                 }
  95                         }
  96                 }
  97
  98                 // No suitable SQL driver was found.
  99                 if (!self::$connected) {
 100                         self::$driver = null;
 101                         self::$db = null;
 102                 }
 103
 104                 return self::$connected;
 105         }
 106
 107         /**
 108          * Disconnects the current database connection
 109          */
 110         public static function disconnect()
 111         {
 112                 if (is_null(self::$db)) {
 113                         return;
 114                 }
 115
 116                 switch (self::$driver) {
 117                         case 'pdo':
 118                                 self::$db = null;
 119                                 break;
 120                         case 'mysqli':
 121                                 self::$db->close();
 122                                 self::$db = null;
 123                                 break;
 124                 }
 125         }
 126
 127         /**
 128          * Perform a reconnect of an existing database connection
 129          */
 130         public static function reconnect() {
 131                 self::disconnect();
 132
 133                 $ret = self::connect(self::$db_serveraddr, self::$db_user, self::$db_pass, self::$db_name, self::$db_charset);
 134                 return $ret;
 135         }
 136
 137         /**
 138          * Return the database object.
 139          * @return PDO|mysqli
 140          */
 141         public static function get_db()
 142         {
 143                 return self::$db;
 144         }
 145
 146         /**
 147          * @brief Returns the MySQL server version string
 148          *
 149          * This function discriminate between the deprecated mysql API and the current
 150          * object-oriented mysqli API. Example of returned string: 5.5.46-0+deb8u1
 151          *
 152          * @return string
 153          */
 154         public static function server_info() {
 155                 if (self::$_server_info == '') {
 156                         switch (self::$driver) {
 157                                 case 'pdo':
 158                                         self::$_server_info = self::$db->getAttribute(PDO::ATTR_SERVER_VERSION);
 159                                         break;
 160                                 case 'mysqli':
 161                                         self::$_server_info = self::$db->server_info;
 162                                         break;
 163                         }
 164                 }
 165                 return self::$_server_info;
 166         }
 167
 168         /**
 169          * @brief Returns the selected database name
 170          *
 171          * @return string
 172          */
 173         public static function database_name() {
 174                 $ret = self::p("SELECT DATABASE() AS `db`");
 175                 $data = self::inArray($ret);
 176                 return $data[0]['db'];
 177         }
 178
 179         /**
 180          * @brief Analyze a database query and log this if some conditions are met.
 181          *
 182          * @param string $query The database query that will be analyzed
 183          */
 184         private static function logIndex($query) {
 185                 $a = get_app();
 186
 187                 if (empty(Config::get('system', 'db_log_index'))) {
 188                         return;
 189                 }
 190
 191                 // Don't explain an explain statement
 192                 if (strtolower(substr($query, 0, 7)) == "explain") {
 193                         return;
 194                 }
 195
 196                 // Only do the explain on "select", "update" and "delete"
 197                 if (!in_array(strtolower(substr($query, 0, 6)), ["select", "update", "delete"])) {
 198                         return;
 199                 }
 200
 201                 $r = self::p("EXPLAIN ".$query);
 202                 if (!DBM::is_result($r)) {
 203                         return;
 204                 }
 205
 206                 $watchlist = explode(',', Config::get('system', 'db_log_index_watch'));
 207                 $blacklist = explode(',', Config::get('system', 'db_log_index_blacklist'));
 208
 209                 while ($row = dba::fetch($r)) {
 210                         if ((intval(Config::get('system', 'db_loglimit_index')) > 0)) {
 211                                 $log = (in_array($row['key'], $watchlist) &&
 212                                         ($row['rows'] >= intval(Config::get('system', 'db_loglimit_index'))));
 213                         } else {
 214                                 $log = false;
 215                         }
 216
 217                         if ((intval(Config::get('system', 'db_loglimit_index_high')) > 0) && ($row['rows'] >= intval(Config::get('system', 'db_loglimit_index_high')))) {
 218                                 $log = true;
 219                         }
 220
 221                         if (in_array($row['key'], $blacklist) || ($row['key'] == "")) {
 222                                 $log = false;
 223                         }
 224
 225                         if ($log) {
 226                                 $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
 227                                 @file_put_contents(Config::get('system', 'db_log_index'), DateTimeFormat::utcNow()."\t".
 228                                                 $row['key']."\t".$row['rows']."\t".$row['Extra']."\t".
 229                                                 basename($backtrace[1]["file"])."\t".
 230                                                 $backtrace[1]["line"]."\t".$backtrace[2]["function"]."\t".
 231                                                 substr($query, 0, 2000)."\n", FILE_APPEND);
 232                         }
 233                 }
 234         }
 235
 236         public static function escape($str) {
 237                 switch (self::$driver) {
 238                         case 'pdo':
 239                                 return substr(@self::$db->quote($str, PDO::PARAM_STR), 1, -1);
 240                         case 'mysqli':
 241                                 return @self::$db->real_escape_string($str);
 242                 }
 243         }
 244
 245         public static function connected() {
 246                 $connected = false;
 247
 248                 switch (self::$driver) {
 249                         case 'pdo':
 250                                 $r = dba::p("SELECT 1");
 251                                 if (DBM::is_result($r)) {
 252                                         $row = dba::inArray($r);
 253                                         $connected = ($row[0]['1'] == '1');
 254                                 }
 255                                 break;
 256                         case 'mysqli':
 257                                 $connected = self::$db->ping();
 258                                 break;
 259                 }
 260                 return $connected;
 261         }
 262
 263         /**
 264          * @brief Replaces ANY_VALUE() function by MIN() function,
 265          *  if the database server does not support ANY_VALUE().
 266          *
 267          * Considerations for Standard SQL, or MySQL with ONLY_FULL_GROUP_BY (default since 5.7.5).
 268          * ANY_VALUE() is available from MySQL 5.7.5 https://dev.mysql.com/doc/refman/5.7/en/miscellaneous-functions.html
 269          * A standard fall-back is to use MIN().
 270          *
 271          * @param string $sql An SQL string without the values
 272          * @return string The input SQL string modified if necessary.
 273          */
 274         public static function any_value_fallback($sql) {
 275                 $server_info = self::server_info();
 276                 if (version_compare($server_info, '5.7.5', '<') ||
 277                         (stripos($server_info, 'MariaDB') !== false)) {
 278                         $sql = str_ireplace('ANY_VALUE(', 'MIN(', $sql);
 279                 }
 280                 return $sql;
 281         }
 282
 283         /**
 284          * @brief beautifies the query - useful for "SHOW PROCESSLIST"
 285          *
 286          * This is safe when we bind the parameters later.
 287          * The parameter values aren't part of the SQL.
 288          *
 289          * @param string $sql An SQL string without the values
 290          * @return string The input SQL string modified if necessary.
 291          */
 292         public static function clean_query($sql) {
 293                 $search = ["\t", "\n", "\r", "  "];
 294                 $replace = [' ', ' ', ' ', ' '];
 295                 do {
 296                         $oldsql = $sql;
 297                         $sql = str_replace($search, $replace, $sql);
 298                 } while ($oldsql != $sql);
 299
 300                 return $sql;
 301         }
 302
 303
 304         /**
 305          * @brief Replaces the ? placeholders with the parameters in the $args array
 306          *
 307          * @param string $sql SQL query
 308          * @param array $args The parameters that are to replace the ? placeholders
 309          * @return string The replaced SQL query
 310          */
 311         private static function replaceParameters($sql, $args) {
 312                 $offset = 0;
 313                 foreach ($args AS $param => $value) {
 314                         if (is_int($args[$param]) || is_float($args[$param])) {
 315                                 $replace = intval($args[$param]);
 316                         } else {
 317                                 $replace = "'".self::escape($args[$param])."'";
 318                         }
 319
 320                         $pos = strpos($sql, '?', $offset);
 321                         if ($pos !== false) {
 322                                 $sql = substr_replace($sql, $replace, $pos, 1);
 323                         }
 324                         $offset = $pos + strlen($replace);
 325                 }
 326                 return $sql;
 327         }
 328
 329         /**
 330          * @brief Convert parameter array to an universal form
 331          * @param array $args Parameter array
 332          * @return array universalized parameter array
 333          */
 334         private static function getParam($args) {
 335                 unset($args[0]);
 336
 337                 // When the second function parameter is an array then use this as the parameter array
 338                 if ((count($args) > 0) && (is_array($args[1]))) {
 339                         return $args[1];
 340                 } else {
 341                         return $args;
 342                 }
 343         }
 344
 345         /**
 346          * @brief Executes a prepared statement that returns data
 347          * @usage Example: $r = p("SELECT * FROM `item` WHERE `guid` = ?", $guid);
 348          *
 349          * Please only use it with complicated queries.
 350          * For all regular queries please use dba::select or dba::exists
 351          *
 352          * @param string $sql SQL statement
 353          * @return bool|object statement object or result object
 354          */
 355         public static function p($sql) {
 356                 $a = get_app();
 357
 358                 $stamp1 = microtime(true);
 359
 360                 $params = self::getParam(func_get_args());
 361
 362                 // Renumber the array keys to be sure that they fit
 363                 $i = 0;
 364                 $args = [];
 365                 foreach ($params AS $param) {
 366                         // Avoid problems with some MySQL servers and boolean values. See issue #3645
 367                         if (is_bool($param)) {
 368                                 $param = (int)$param;
 369                         }
 370                         $args[++$i] = $param;
 371                 }
 372
 373                 if (!self::$connected) {
 374                         return false;
 375                 }
 376
 377                 if ((substr_count($sql, '?') != count($args)) && (count($args) > 0)) {
 378                         // Question: Should we continue or stop the query here?
 379                         logger('Parameter mismatch. Query "'.$sql.'" - Parameters '.print_r($args, true), LOGGER_DEBUG);
 380                 }
 381
 382                 $sql = self::clean_query($sql);
 383                 $sql = self::any_value_fallback($sql);
 384
 385                 $orig_sql = $sql;
 386
 387                 if (Config::get('system', 'db_callstack')) {
 388                         $sql = "/*".System::callstack()." */ ".$sql;
 389                 }
 390
 391                 self::$error = '';
 392                 self::$errorno = 0;
 393                 self::$affected_rows = 0;
 394
 395                 // We have to make some things different if this function is called from "e"
 396                 $trace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 2);
 397
 398                 if (isset($trace[1])) {
 399                         $called_from = $trace[1];
 400                 } else {
 401                         // We use just something that is defined to avoid warnings
 402                         $called_from = $trace[0];
 403                 }
 404                 // We are having an own error logging in the function "e"
 405                 $called_from_e = ($called_from['function'] == 'e');
 406
 407                 switch (self::$driver) {
 408                         case 'pdo':
 409                                 // If there are no arguments we use "query"
 410                                 if (count($args) == 0) {
 411                                         if (!$retval = self::$db->query($sql)) {
 412                                                 $errorInfo = self::$db->errorInfo();
 413                                                 self::$error = $errorInfo[2];
 414                                                 self::$errorno = $errorInfo[1];
 415                                                 $retval = false;
 416                                                 break;
 417                                         }
 418                                         self::$affected_rows = $retval->rowCount();
 419                                         break;
 420                                 }
 421
 422                                 if (!$stmt = self::$db->prepare($sql)) {
 423                                         $errorInfo = self::$db->errorInfo();
 424                                         self::$error = $errorInfo[2];
 425                                         self::$errorno = $errorInfo[1];
 426                                         $retval = false;
 427                                         break;
 428                                 }
 429
 430                                 foreach ($args AS $param => $value) {
 431                                         if (is_int($args[$param])) {
 432                                                 $data_type = PDO::PARAM_INT;
 433                                         } else {
 434                                                 $data_type = PDO::PARAM_STR;
 435                                         }
 436                                         $stmt->bindParam($param, $args[$param], $data_type);
 437                                 }
 438
 439                                 if (!$stmt->execute()) {
 440                                         $errorInfo = $stmt->errorInfo();
 441                                         self::$error = $errorInfo[2];
 442                                         self::$errorno = $errorInfo[1];
 443                                         $retval = false;
 444                                 } else {
 445                                         $retval = $stmt;
 446                                         self::$affected_rows = $retval->rowCount();
 447                                 }
 448                                 break;
 449                         case 'mysqli':
 450                                 // There are SQL statements that cannot be executed with a prepared statement
 451                                 $parts = explode(' ', $orig_sql);
 452                                 $command = strtolower($parts[0]);
 453                                 $can_be_prepared = in_array($command, ['select', 'update', 'insert', 'delete']);
 454
 455                                 // The fallback routine is called as well when there are no arguments
 456                                 if (!$can_be_prepared || (count($args) == 0)) {
 457                                         $retval = self::$db->query(self::replaceParameters($sql, $args));
 458                                         if (self::$db->errno) {
 459                                                 self::$error = self::$db->error;
 460                                                 self::$errorno = self::$db->errno;
 461                                                 $retval = false;
 462                                         } else {
 463                                                 if (isset($retval->num_rows)) {
 464                                                         self::$affected_rows = $retval->num_rows;
 465                                                 } else {
 466                                                         self::$affected_rows = self::$db->affected_rows;
 467                                                 }
 468                                         }
 469                                         break;
 470                                 }
 471
 472                                 $stmt = self::$db->stmt_init();
 473
 474                                 if (!$stmt->prepare($sql)) {
 475                                         self::$error = $stmt->error;
 476                                         self::$errorno = $stmt->errno;
 477                                         $retval = false;
 478                                         break;
 479                                 }
 480
 481                                 $param_types = '';
 482                                 $values = [];
 483                                 foreach ($args AS $param => $value) {
 484                                         if (is_int($args[$param])) {
 485                                                 $param_types .= 'i';
 486                                         } elseif (is_float($args[$param])) {
 487                                                 $param_types .= 'd';
 488                                         } elseif (is_string($args[$param])) {
 489                                                 $param_types .= 's';
 490                                         } else {
 491                                                 $param_types .= 'b';
 492                                         }
 493                                         $values[] = &$args[$param];
 494                                 }
 495
 496                                 if (count($values) > 0) {
 497                                         array_unshift($values, $param_types);
 498                                         call_user_func_array([$stmt, 'bind_param'], $values);
 499                                 }
 500
 501                                 if (!$stmt->execute()) {
 502                                         self::$error = self::$db->error;
 503                                         self::$errorno = self::$db->errno;
 504                                         $retval = false;
 505                                 } else {
 506                                         $stmt->store_result();
 507                                         $retval = $stmt;
 508                                         self::$affected_rows = $retval->affected_rows;
 509                                 }
 510                                 break;
 511                 }
 512
 513                 // We are having an own error logging in the function "e"
 514                 if ((self::$errorno != 0) && !$called_from_e) {
 515                         // We have to preserve the error code, somewhere in the logging it get lost
 516                         $error = self::$error;
 517                         $errorno = self::$errorno;
 518
 519                         logger('DB Error '.self::$errorno.': '.self::$error."\n".
 520                                 System::callstack(8)."\n".self::replaceParameters($sql, $args));
 521
 522                         // On a lost connection we try to reconnect - but only once.
 523                         if ($errorno == 2006) {
 524                                 if (self::$in_retrial || !self::reconnect()) {
 525                                         // It doesn't make sense to continue when the database connection was lost
 526                                         if (self::$in_retrial) {
 527                                                 logger('Giving up retrial because of database error '.$errorno.': '.$error);
 528                                         } else {
 529                                                 logger("Couldn't reconnect after database error ".$errorno.': '.$error);
 530                                         }
 531                                         exit(1);
 532                                 } else {
 533                                         // We try it again
 534                                         logger('Reconnected after database error '.$errorno.': '.$error);
 535                                         self::$in_retrial = true;
 536                                         $ret = self::p($sql, $args);
 537                                         self::$in_retrial = false;
 538                                         return $ret;
 539                                 }
 540                         }
 541
 542                         self::$error = $error;
 543                         self::$errorno = $errorno;
 544                 }
 545
 546                 $a->save_timestamp($stamp1, 'database');
 547
 548                 if (Config::get('system', 'db_log')) {
 549                         $stamp2 = microtime(true);
 550                         $duration = (float)($stamp2 - $stamp1);
 551
 552                         if (($duration > Config::get('system', 'db_loglimit'))) {
 553                                 $duration = round($duration, 3);
 554                                 $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
 555
 556                                 @file_put_contents(Config::get('system', 'db_log'), DateTimeFormat::utcNow()."\t".$duration."\t".
 557                                                 basename($backtrace[1]["file"])."\t".
 558                                                 $backtrace[1]["line"]."\t".$backtrace[2]["function"]."\t".
 559                                                 substr(self::replaceParameters($sql, $args), 0, 2000)."\n", FILE_APPEND);
 560                         }
 561                 }
 562                 return $retval;
 563         }
 564
 565         /**
 566          * @brief Executes a prepared statement like UPDATE or INSERT that doesn't return data
 567          *
 568          * Please use dba::delete, dba::insert, dba::update, ... instead
 569          *
 570          * @param string $sql SQL statement
 571          * @return boolean Was the query successfull? False is returned only if an error occurred
 572          */
 573         public static function e($sql) {
 574                 $a = get_app();
 575
 576                 $stamp = microtime(true);
 577
 578                 $params = self::getParam(func_get_args());
 579
 580                 // In a case of a deadlock we are repeating the query 20 times
 581                 $timeout = 20;
 582
 583                 do {
 584                         $stmt = self::p($sql, $params);
 585
 586                         if (is_bool($stmt)) {
 587                                 $retval = $stmt;
 588                         } elseif (is_object($stmt)) {
 589                                 $retval = true;
 590                         } else {
 591                                 $retval = false;
 592                         }
 593
 594                         self::close($stmt);
 595
 596                 } while ((self::$errorno == 1213) && (--$timeout > 0));
 597
 598                 if (self::$errorno != 0) {
 599                         // We have to preserve the error code, somewhere in the logging it get lost
 600                         $error = self::$error;
 601                         $errorno = self::$errorno;
 602
 603                         logger('DB Error '.self::$errorno.': '.self::$error."\n".
 604                                 System::callstack(8)."\n".self::replaceParameters($sql, $params));
 605
 606                         // On a lost connection we simply quit.
 607                         // A reconnect like in self::p could be dangerous with modifications
 608                         if ($errorno == 2006) {
 609                                 logger('Giving up because of database error '.$errorno.': '.$error);
 610                                 exit(1);
 611                         }
 612
 613                         self::$error = $error;
 614                         self::$errorno = $errorno;
 615                 }
 616
 617                 $a->save_timestamp($stamp, "database_write");
 618
 619                 return $retval;
 620         }
 621
 622         /**
 623          * @brief Check if data exists
 624          *
 625          * @param string $table Table name
 626          * @param array $condition array of fields for condition
 627          *
 628          * @return boolean Are there rows for that condition?
 629          */
 630         public static function exists($table, $condition) {
 631                 if (empty($table)) {
 632                         return false;
 633                 }
 634
 635                 $fields = [];
 636
 637                 reset($condition);
 638                 $first_key = key($condition);
 639                 if (!is_int($first_key)) {
 640                         $fields = [$first_key];
 641                 }
 642
 643                 $stmt = self::select($table, $fields, $condition, ['limit' => 1]);
 644
 645                 if (is_bool($stmt)) {
 646                         $retval = $stmt;
 647                 } else {
 648                         $retval = (self::num_rows($stmt) > 0);
 649                 }
 650
 651                 self::close($stmt);
 652
 653                 return $retval;
 654         }
 655
 656         /**
 657          * Fetches the first row
 658          *
 659          * Please use dba::selectFirst or dba::exists whenever this is possible.
 660          *
 661          * @brief Fetches the first row
 662          * @param string $sql SQL statement
 663          * @return array first row of query
 664          */
 665         public static function fetch_first($sql) {
 666                 $params = self::getParam(func_get_args());
 667
 668                 $stmt = self::p($sql, $params);
 669
 670                 if (is_bool($stmt)) {
 671                         $retval = $stmt;
 672                 } else {
 673                         $retval = self::fetch($stmt);
 674                 }
 675
 676                 self::close($stmt);
 677
 678                 return $retval;
 679         }
 680
 681         /**
 682          * @brief Returns the number of affected rows of the last statement
 683          *
 684          * @return int Number of rows
 685          */
 686         public static function affected_rows() {
 687                 return self::$affected_rows;
 688         }
 689
 690         /**
 691          * @brief Returns the number of columns of a statement
 692          *
 693          * @param object Statement object
 694          * @return int Number of columns
 695          */
 696         public static function columnCount($stmt) {
 697                 if (!is_object($stmt)) {
 698                         return 0;
 699                 }
 700                 switch (self::$driver) {
 701                         case 'pdo':
 702                                 return $stmt->columnCount();
 703                         case 'mysqli':
 704                                 return $stmt->field_count;
 705                 }
 706                 return 0;
 707         }
 708         /**
 709          * @brief Returns the number of rows of a statement
 710          *
 711          * @param PDOStatement|mysqli_result|mysqli_stmt Statement object
 712          * @return int Number of rows
 713          */
 714         public static function num_rows($stmt) {
 715                 if (!is_object($stmt)) {
 716                         return 0;
 717                 }
 718                 switch (self::$driver) {
 719                         case 'pdo':
 720                                 return $stmt->rowCount();
 721                         case 'mysqli':
 722                                 return $stmt->num_rows;
 723                 }
 724                 return 0;
 725         }
 726
 727         /**
 728          * @brief Fetch a single row
 729          *
 730          * @param mixed $stmt statement object
 731          * @return array current row
 732          */
 733         public static function fetch($stmt) {
 734                 $a = get_app();
 735
 736                 $stamp1 = microtime(true);
 737
 738                 $columns = [];
 739
 740                 if (!is_object($stmt)) {
 741                         return false;
 742                 }
 743
 744                 switch (self::$driver) {
 745                         case 'pdo':
 746                                 $columns = $stmt->fetch(PDO::FETCH_ASSOC);
 747                                 break;
 748                         case 'mysqli':
 749                                 if (get_class($stmt) == 'mysqli_result') {
 750                                         $columns = $stmt->fetch_assoc();
 751                                         break;
 752                                 }
 753
 754                                 // This code works, but is slow
 755
 756                                 // Bind the result to a result array
 757                                 $cols = [];
 758
 759                                 $cols_num = [];
 760                                 for ($x = 0; $x < $stmt->field_count; $x++) {
 761                                         $cols[] = &$cols_num[$x];
 762                                 }
 763
 764                                 call_user_func_array([$stmt, 'bind_result'], $cols);
 765
 766                                 if (!$stmt->fetch()) {
 767                                         return false;
 768                                 }
 769
 770                                 // The slow part:
 771                                 // We need to get the field names for the array keys
 772                                 // It seems that there is no better way to do this.
 773                                 $result = $stmt->result_metadata();
 774                                 $fields = $result->fetch_fields();
 775
 776                                 foreach ($cols_num AS $param => $col) {
 777                                         $columns[$fields[$param]->name] = $col;
 778                                 }
 779                 }
 780
 781                 $a->save_timestamp($stamp1, 'database');
 782
 783                 return $columns;
 784         }
 785
 786         /**
 787          * @brief Insert a row into a table
 788          *
 789          * @param string $table Table name
 790          * @param array $param parameter array
 791          * @param bool $on_duplicate_update Do an update on a duplicate entry
 792          *
 793          * @return boolean was the insert successfull?
 794          */
 795         public static function insert($table, $param, $on_duplicate_update = false) {
 796
 797                 if (empty($table) || empty($param)) {
 798                         logger('Table and fields have to be set');
 799                         return false;
 800                 }
 801
 802                 $sql = "INSERT INTO `".self::escape($table)."` (`".implode("`, `", array_keys($param))."`) VALUES (".
 803                         substr(str_repeat("?, ", count($param)), 0, -2).")";
 804
 805                 if ($on_duplicate_update) {
 806                         $sql .= " ON DUPLICATE KEY UPDATE `".implode("` = ?, `", array_keys($param))."` = ?";
 807
 808                         $values = array_values($param);
 809                         $param = array_merge_recursive($values, $values);
 810                 }
 811
 812                 return self::e($sql, $param);
 813         }
 814
 815         /**
 816          * @brief Fetch the id of the last insert command
 817          *
 818          * @return integer Last inserted id
 819          */
 820         public static function lastInsertId() {
 821                 switch (self::$driver) {
 822                         case 'pdo':
 823                                 $id = self::$db->lastInsertId();
 824                                 break;
 825                         case 'mysqli':
 826                                 $id = self::$db->insert_id;
 827                                 break;
 828                 }
 829                 return $id;
 830         }
 831
 832         /**
 833          * @brief Locks a table for exclusive write access
 834          *
 835          * This function can be extended in the future to accept a table array as well.
 836          *
 837          * @param string $table Table name
 838          *
 839          * @return boolean was the lock successful?
 840          */
 841         public static function lock($table) {
 842                 // See here: https://dev.mysql.com/doc/refman/5.7/en/lock-tables-and-transactions.html
 843                 if (self::$driver == 'pdo') {
 844                         self::e("SET autocommit=0");
 845                         self::$db->setAttribute(PDO::ATTR_EMULATE_PREPARES, true);
 846                 } else {
 847                         self::$db->autocommit(false);
 848                 }
 849
 850                 $success = self::e("LOCK TABLES `".self::escape($table)."` WRITE");
 851
 852                 if (self::$driver == 'pdo') {
 853                         self::$db->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
 854                 }
 855
 856                 if (!$success) {
 857                         if (self::$driver == 'pdo') {
 858                                 self::e("SET autocommit=1");
 859                         } else {
 860                                 self::$db->autocommit(true);
 861                         }
 862                 } else {
 863                         self::$in_transaction = true;
 864                 }
 865                 return $success;
 866         }
 867
 868         /**
 869          * @brief Unlocks all locked tables
 870          *
 871          * @return boolean was the unlock successful?
 872          */
 873         public static function unlock() {
 874                 // See here: https://dev.mysql.com/doc/refman/5.7/en/lock-tables-and-transactions.html
 875                 self::performCommit();
 876
 877                 if (self::$driver == 'pdo') {
 878                         self::$db->setAttribute(PDO::ATTR_EMULATE_PREPARES, true);
 879                 }
 880
 881                 $success = self::e("UNLOCK TABLES");
 882
 883                 if (self::$driver == 'pdo') {
 884                         self::$db->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
 885                         self::e("SET autocommit=1");
 886                 } else {
 887                         self::$db->autocommit(true);
 888                 }
 889
 890                 self::$in_transaction = false;
 891                 return $success;
 892         }
 893
 894         /**
 895          * @brief Starts a transaction
 896          *
 897          * @return boolean Was the command executed successfully?
 898          */
 899         public static function transaction() {
 900                 if (!self::performCommit()) {
 901                         return false;
 902                 }
 903
 904                 switch (self::$driver) {
 905                         case 'pdo':
 906                                 if (self::$db->inTransaction()) {
 907                                         break;
 908                                 }
 909                                 if (!self::$db->beginTransaction()) {
 910                                         return false;
 911                                 }
 912                                 break;
 913                         case 'mysqli':
 914                                 if (!self::$db->begin_transaction()) {
 915                                         return false;
 916                                 }
 917                                 break;
 918                 }
 919
 920                 self::$in_transaction = true;
 921                 return true;
 922         }
 923
 924         private static function performCommit()
 925         {
 926                 switch (self::$driver) {
 927                         case 'pdo':
 928                                 if (!self::$db->inTransaction()) {
 929                                         return true;
 930                                 }
 931                                 return self::$db->commit();
 932                         case 'mysqli':
 933                                 return self::$db->commit();
 934                 }
 935                 return true;
 936         }
 937
 938         /**
 939          * @brief Does a commit
 940          *
 941          * @return boolean Was the command executed successfully?
 942          */
 943         public static function commit() {
 944                 if (!self::performCommit()) {
 945                         return false;
 946                 }
 947                 self::$in_transaction = false;
 948                 return true;
 949         }
 950
 951         /**
 952          * @brief Does a rollback
 953          *
 954          * @return boolean Was the command executed successfully?
 955          */
 956         public static function rollback() {
 957                 $ret = false;
 958
 959                 switch (self::$driver) {
 960                         case 'pdo':
 961                                 if (!self::$db->inTransaction()) {
 962                                         $ret = true;
 963                                         break;
 964                                 }
 965                                 $ret = self::$db->rollBack();
 966                                 break;
 967                         case 'mysqli':
 968                                 $ret = self::$db->rollback();
 969                                 break;
 970                 }
 971                 self::$in_transaction = false;
 972                 return $ret;
 973         }
 974
 975         /**
 976          * @brief Build the array with the table relations
 977          *
 978          * The array is build from the database definitions in DBStructure.php
 979          *
 980          * This process must only be started once, since the value is cached.
 981          */
 982         private static function buildRelationData() {
 983                 $definition = DBStructure::definition();
 984
 985                 foreach ($definition AS $table => $structure) {
 986                         foreach ($structure['fields'] AS $field => $field_struct) {
 987                                 if (isset($field_struct['relation'])) {
 988                                         foreach ($field_struct['relation'] AS $rel_table => $rel_field) {
 989                                                 self::$relation[$rel_table][$rel_field][$table][] = $field;
 990                                         }
 991                                 }
 992                         }
 993                 }
 994         }
 995
 996         /**
 997          * @brief Delete a row from a table
 998          *
 999          * @param string  $table       Table name
1000          * @param array   $conditions  Field condition(s)
1001          * @param array   $options
1002          *                - cascade: If true we delete records in other tables that depend on the one we're deleting through
1003          *                           relations (default: true)
1004          * @param boolean $in_process  Internal use: Only do a commit after the last delete
1005          * @param array   $callstack   Internal use: prevent endless loops
1006          *
1007          * @return boolean|array was the delete successful? When $in_process is set: deletion data
1008          */
1009         public static function delete($table, array $conditions, array $options = [], $in_process = false, array &$callstack = [])
1010         {
1011                 if (empty($table) || empty($conditions)) {
1012                         logger('Table and conditions have to be set');
1013                         return false;
1014                 }
1015
1016                 $commands = [];
1017
1018                 // Create a key for the loop prevention
1019                 $key = $table . ':' . json_encode($conditions);
1020
1021                 // We quit when this key already exists in the callstack.
1022                 if (isset($callstack[$key])) {
1023                         return $commands;
1024                 }
1025
1026                 $callstack[$key] = true;
1027
1028                 $table = self::escape($table);
1029
1030                 $commands[$key] = ['table' => $table, 'conditions' => $conditions];
1031
1032                 $cascade = defaults($options, 'cascade', true);
1033
1034                 // To speed up the whole process we cache the table relations
1035                 if ($cascade && count(self::$relation) == 0) {
1036                         self::buildRelationData();
1037                 }
1038
1039                 // Is there a relation entry for the table?
1040                 if ($cascade && isset(self::$relation[$table])) {
1041                         // We only allow a simple "one field" relation.
1042                         $field = array_keys(self::$relation[$table])[0];
1043                         $rel_def = array_values(self::$relation[$table])[0];
1044
1045                         // Create a key for preventing double queries
1046                         $qkey = $field . '-' . $table . ':' . json_encode($conditions);
1047
1048                         // When the search field is the relation field, we don't need to fetch the rows
1049                         // This is useful when the leading record is already deleted in the frontend but the rest is done in the backend
1050                         if ((count($conditions) == 1) && ($field == array_keys($conditions)[0])) {
1051                                 foreach ($rel_def AS $rel_table => $rel_fields) {
1052                                         foreach ($rel_fields AS $rel_field) {
1053                                                 $retval = self::delete($rel_table, [$rel_field => array_values($conditions)[0]], $options, true, $callstack);
1054                                                 $commands = array_merge($commands, $retval);
1055                                         }
1056                                 }
1057                                 // We quit when this key already exists in the callstack.
1058                         } elseif (!isset($callstack[$qkey])) {
1059
1060                                 $callstack[$qkey] = true;
1061
1062                                 // Fetch all rows that are to be deleted
1063                                 $data = self::select($table, [$field], $conditions);
1064
1065                                 while ($row = self::fetch($data)) {
1066                                         // Now we accumulate the delete commands
1067                                         $retval = self::delete($table, [$field => $row[$field]], $options, true, $callstack);
1068                                         $commands = array_merge($commands, $retval);
1069                                 }
1070
1071                                 self::close($data);
1072
1073                                 // Since we had split the delete command we don't need the original command anymore
1074                                 unset($commands[$key]);
1075                         }
1076                 }
1077
1078                 if (!$in_process) {
1079                         // Now we finalize the process
1080                         $do_transaction = !self::$in_transaction;
1081
1082                         if ($do_transaction) {
1083                                 self::transaction();
1084                         }
1085
1086                         $compacted = [];
1087                         $counter = [];
1088
1089                         foreach ($commands AS $command) {
1090                                 $conditions = $command['conditions'];
1091                                 reset($conditions);
1092                                 $first_key = key($conditions);
1093
1094                                 $condition_string = self::buildCondition($conditions);
1095
1096                                 if ((count($command['conditions']) > 1) || is_int($first_key)) {
1097                                         $sql = "DELETE FROM `" . $command['table'] . "`" . $condition_string;
1098                                         logger(self::replaceParameters($sql, $conditions), LOGGER_DATA);
1099
1100                                         if (!self::e($sql, $conditions)) {
1101                                                 if ($do_transaction) {
1102                                                         self::rollback();
1103                                                 }
1104                                                 return false;
1105                                         }
1106                                 } else {
1107                                         $key_table = $command['table'];
1108                                         $key_condition = array_keys($command['conditions'])[0];
1109                                         $value = array_values($command['conditions'])[0];
1110
1111                                         // Split the SQL queries in chunks of 100 values
1112                                         // We do the $i stuff here to make the code better readable
1113                                         $i = isset($counter[$key_table][$key_condition]) ? $counter[$key_table][$key_condition] : 0;
1114                                         if (isset($compacted[$key_table][$key_condition][$i]) && count($compacted[$key_table][$key_condition][$i]) > 100) {
1115                                                 ++$i;
1116                                         }
1117
1118                                         $compacted[$key_table][$key_condition][$i][$value] = $value;
1119                                         $counter[$key_table][$key_condition] = $i;
1120                                 }
1121                         }
1122                         foreach ($compacted AS $table => $values) {
1123                                 foreach ($values AS $field => $field_value_list) {
1124                                         foreach ($field_value_list AS $field_values) {
1125                                                 $sql = "DELETE FROM `" . $table . "` WHERE `" . $field . "` IN (" .
1126                                                         substr(str_repeat("?, ", count($field_values)), 0, -2) . ");";
1127
1128                                                 logger(self::replaceParameters($sql, $field_values), LOGGER_DATA);
1129
1130                                                 if (!self::e($sql, $field_values)) {
1131                                                         if ($do_transaction) {
1132                                                                 self::rollback();
1133                                                         }
1134                                                         return false;
1135                                                 }
1136                                         }
1137                                 }
1138                         }
1139                         if ($do_transaction) {
1140                                 self::commit();
1141                         }
1142                         return true;
1143                 }
1144
1145                 return $commands;
1146         }
1147
1148         /**
1149          * @brief Updates rows
1150          *
1151          * Updates rows in the database. When $old_fields is set to an array,
1152          * the system will only do an update if the fields in that array changed.
1153          *
1154          * Attention:
1155          * Only the values in $old_fields are compared.
1156          * This is an intentional behaviour.
1157          *
1158          * Example:
1159          * We include the timestamp field in $fields but not in $old_fields.
1160          * Then the row will only get the new timestamp when the other fields had changed.
1161          *
1162          * When $old_fields is set to a boolean value the system will do this compare itself.
1163          * When $old_fields is set to "true" the system will do an insert if the row doesn't exists.
1164          *
1165          * Attention:
1166          * Only set $old_fields to a boolean value when you are sure that you will update a single row.
1167          * When you set $old_fields to "true" then $fields must contain all relevant fields!
1168          *
1169          * @param string $table Table name
1170          * @param array $fields contains the fields that are updated
1171          * @param array $condition condition array with the key values
1172          * @param array|boolean $old_fields array with the old field values that are about to be replaced (true = update on duplicate)
1173          *
1174          * @return boolean was the update successfull?
1175          */
1176         public static function update($table, $fields, $condition, $old_fields = []) {
1177
1178                 if (empty($table) || empty($fields) || empty($condition)) {
1179                         logger('Table, fields and condition have to be set');
1180                         return false;
1181                 }
1182
1183                 $table = self::escape($table);
1184
1185                 $condition_string = self::buildCondition($condition);
1186
1187                 if (is_bool($old_fields)) {
1188                         $do_insert = $old_fields;
1189
1190                         $old_fields = self::selectFirst($table, [], $condition);
1191
1192                         if (is_bool($old_fields)) {
1193                                 if ($do_insert) {
1194                                         $values = array_merge($condition, $fields);
1195                                         return self::insert($table, $values, $do_insert);
1196                                 }
1197                                 $old_fields = [];
1198                         }
1199                 }
1200
1201                 $do_update = (count($old_fields) == 0);
1202
1203                 foreach ($old_fields AS $fieldname => $content) {
1204                         if (isset($fields[$fieldname])) {
1205                                 if ($fields[$fieldname] == $content) {
1206                                         unset($fields[$fieldname]);
1207                                 } else {
1208                                         $do_update = true;
1209                                 }
1210                         }
1211                 }
1212
1213                 if (!$do_update || (count($fields) == 0)) {
1214                         return true;
1215                 }
1216
1217                 $sql = "UPDATE `".$table."` SET `".
1218                         implode("` = ?, `", array_keys($fields))."` = ?".$condition_string;
1219
1220                 $params1 = array_values($fields);
1221                 $params2 = array_values($condition);
1222                 $params = array_merge_recursive($params1, $params2);
1223
1224                 return self::e($sql, $params);
1225         }
1226
1227         /**
1228          * Retrieve a single record from a table and returns it in an associative array
1229          *
1230          * @brief Retrieve a single record from a table
1231          * @param string $table
1232          * @param array  $fields
1233          * @param array  $condition
1234          * @param array  $params
1235          * @return bool|array
1236          * @see dba::select
1237          */
1238         public static function selectFirst($table, array $fields = [], array $condition = [], $params = [])
1239         {
1240                 $params['limit'] = 1;
1241                 $result = self::select($table, $fields, $condition, $params);
1242
1243                 if (is_bool($result)) {
1244                         return $result;
1245                 } else {
1246                         $row = self::fetch($result);
1247                         self::close($result);
1248                         return $row;
1249                 }
1250         }
1251
1252         /**
1253          * @brief Select rows from a table
1254          *
1255          * @param string $table     Table name
1256          * @param array  $fields    Array of selected fields, empty for all
1257          * @param array  $condition Array of fields for condition
1258          * @param array  $params    Array of several parameters
1259          *
1260          * @return boolean|object
1261          *
1262          * Example:
1263          * $table = "item";
1264          * $fields = array("id", "uri", "uid", "network");
1265          *
1266          * $condition = array("uid" => 1, "network" => 'dspr');
1267          * or:
1268          * $condition = array("`uid` = ? AND `network` IN (?, ?)", 1, 'dfrn', 'dspr');
1269          *
1270          * $params = array("order" => array("id", "received" => true), "limit" => 10);
1271          *
1272          * $data = dba::select($table, $fields, $condition, $params);
1273          */
1274         public static function select($table, array $fields = [], array $condition = [], array $params = [])
1275         {
1276                 if ($table == '') {
1277                         return false;
1278                 }
1279
1280                 $table = self::escape($table);
1281
1282                 if (count($fields) > 0) {
1283                         $select_fields = "`" . implode("`, `", array_values($fields)) . "`";
1284                 } else {
1285                         $select_fields = "*";
1286                 }
1287
1288                 $condition_string = self::buildCondition($condition);
1289
1290                 $param_string = self::buildParameter($params);
1291
1292                 $sql = "SELECT " . $select_fields . " FROM `" . $table . "`" . $condition_string . $param_string;
1293
1294                 $result = self::p($sql, $condition);
1295
1296                 return $result;
1297         }
1298
1299         /**
1300          * @brief Counts the rows from a table satisfying the provided condition
1301          *
1302          * @param string $table Table name
1303          * @param array $condition array of fields for condition
1304          *
1305          * @return int
1306          *
1307          * Example:
1308          * $table = "item";
1309          *
1310          * $condition = ["uid" => 1, "network" => 'dspr'];
1311          * or:
1312          * $condition = ["`uid` = ? AND `network` IN (?, ?)", 1, 'dfrn', 'dspr'];
1313          *
1314          * $count = dba::count($table, $condition);
1315          */
1316         public static function count($table, array $condition = [])
1317         {
1318                 if ($table == '') {
1319                         return false;
1320                 }
1321
1322                 $condition_string = self::buildCondition($condition);
1323
1324                 $sql = "SELECT COUNT(*) AS `count` FROM `".$table."`".$condition_string;
1325
1326                 $row = self::fetch_first($sql, $condition);
1327
1328                 return $row['count'];
1329         }
1330
1331         /**
1332          * @brief Returns the SQL condition string built from the provided condition array
1333          *
1334          * This function operates with two modes.
1335          * - Supplied with a filed/value associative array, it builds simple strict
1336          *   equality conditions linked by AND.
1337          * - Supplied with a flat list, the first element is the condition string and
1338          *   the following arguments are the values to be interpolated
1339          *
1340          * $condition = ["uid" => 1, "network" => 'dspr'];
1341          * or:
1342          * $condition = ["`uid` = ? AND `network` IN (?, ?)", 1, 'dfrn', 'dspr'];
1343          *
1344          * In either case, the provided array is left with the parameters only
1345          *
1346          * @param array $condition
1347          * @return string
1348          */
1349         public static function buildCondition(array &$condition = [])
1350         {
1351                 $condition_string = '';
1352                 if (count($condition) > 0) {
1353                         reset($condition);
1354                         $first_key = key($condition);
1355                         if (is_int($first_key)) {
1356                                 $condition_string = " WHERE (" . array_shift($condition) . ")";
1357                         } else {
1358                                 $new_values = [];
1359                                 $condition_string = "";
1360                                 foreach ($condition as $field => $value) {
1361                                         if ($condition_string != "") {
1362                                                 $condition_string .= " AND ";
1363                                         }
1364                                         if (is_array($value)) {
1365                                                 /* Workaround for MySQL Bug #64791.
1366                                                  * Never mix data types inside any IN() condition.
1367                                                  * In case of mixed types, cast all as string.
1368                                                  * Logic needs to be consistent with dba::p() data types.
1369                                                  */
1370                                                 $is_int = false;
1371                                                 $is_alpha = false;
1372                                                 foreach ($value as $single_value) {
1373                                                         if (is_int($single_value)) {
1374                                                                 $is_int = true;
1375                                                         } else {
1376                                                                 $is_alpha = true;
1377                                                         }
1378                                                 }
1379
1380                                                 if ($is_int && $is_alpha) {
1381                                                         foreach ($value as &$ref) {
1382                                                                 if (is_int($ref)) {
1383                                                                         $ref = (string)$ref;
1384                                                                 }
1385                                                         }
1386                                                         unset($ref); //Prevent accidental re-use.
1387                                                 }
1388
1389                                                 $new_values = array_merge($new_values, array_values($value));
1390                                                 $placeholders = substr(str_repeat("?, ", count($value)), 0, -2);
1391                                                 $condition_string .= "`" . $field . "` IN (" . $placeholders . ")";
1392                                         } else {
1393                                                 $new_values[$field] = $value;
1394                                                 $condition_string .= "`" . $field . "` = ?";
1395                                         }
1396                                 }
1397                                 $condition_string = " WHERE (" . $condition_string . ")";
1398                                 $condition = $new_values;
1399                         }
1400                 }
1401
1402                 return $condition_string;
1403         }
1404
1405         /**
1406          * @brief Returns the SQL parameter string built from the provided parameter array
1407          *
1408          * @param array $params
1409          * @return string
1410          */
1411         public static function buildParameter(array $params = [])
1412         {
1413                 $order_string = '';
1414                 if (isset($params['order'])) {
1415                         $order_string = " ORDER BY ";
1416                         foreach ($params['order'] AS $fields => $order) {
1417                                 if (!is_int($fields)) {
1418                                         $order_string .= "`" . $fields . "` " . ($order ? "DESC" : "ASC") . ", ";
1419                                 } else {
1420                                         $order_string .= "`" . $order . "`, ";
1421                                 }
1422                         }
1423                         $order_string = substr($order_string, 0, -2);
1424                 }
1425
1426                 $limit_string = '';
1427                 if (isset($params['limit']) && is_int($params['limit'])) {
1428                         $limit_string = " LIMIT " . $params['limit'];
1429                 }
1430
1431                 if (isset($params['limit']) && is_array($params['limit'])) {
1432                         $limit_string = " LIMIT " . intval($params['limit'][0]) . ", " . intval($params['limit'][1]);
1433                 }
1434
1435                 return $order_string.$limit_string;
1436         }
1437
1438         /**
1439          * @brief Fills an array with data from a query
1440          *
1441          * @param object $stmt statement object
1442          * @return array Data array
1443          */
1444         public static function inArray($stmt, $do_close = true) {
1445                 if (is_bool($stmt)) {
1446                         return $stmt;
1447                 }
1448
1449                 $data = [];
1450                 while ($row = self::fetch($stmt)) {
1451                         $data[] = $row;
1452                 }
1453                 if ($do_close) {
1454                         self::close($stmt);
1455                 }
1456                 return $data;
1457         }
1458
1459         /**
1460          * @brief Returns the error number of the last query
1461          *
1462          * @return string Error number (0 if no error)
1463          */
1464         public static function errorNo() {
1465                 return self::$errorno;
1466         }
1467
1468         /**
1469          * @brief Returns the error message of the last query
1470          *
1471          * @return string Error message ('' if no error)
1472          */
1473         public static function errorMessage() {
1474                 return self::$error;
1475         }
1476
1477         /**
1478          * @brief Closes the current statement
1479          *
1480          * @param object $stmt statement object
1481          * @return boolean was the close successful?
1482          */
1483         public static function close($stmt) {
1484                 $a = get_app();
1485
1486                 $stamp1 = microtime(true);
1487
1488                 if (!is_object($stmt)) {
1489                         return false;
1490                 }
1491
1492                 switch (self::$driver) {
1493                         case 'pdo':
1494                                 $ret = $stmt->closeCursor();
1495                                 break;
1496                         case 'mysqli':
1497                                 // MySQLi offers both a mysqli_stmt and a mysqli_result class.
1498                                 // We should be careful not to assume the object type of $stmt
1499                                 // because dba::p() has been able to return both types.
1500                                 if ($stmt instanceof mysqli_stmt) {
1501                                         $stmt->free_result();
1502                                         $ret = $stmt->close();
1503                                 } elseif ($stmt instanceof mysqli_result) {
1504                                         $stmt->free();
1505                                         $ret = true;
1506                                 } else {
1507                                         $ret = false;
1508                                 }
1509                                 break;
1510                 }
1511
1512                 $a->save_timestamp($stamp1, 'database');
1513
1514                 return $ret;
1515         }
1516 }
1517
1518 function dbesc($str) {
1519         if (dba::$connected) {
1520                 return(dba::escape($str));
1521         } else {
1522                 return(str_replace("'","\\'",$str));
1523         }
1524 }
1525
1526 /**
1527  * @brief execute SQL query with printf style args - deprecated
1528  *
1529  * Please use the dba:: functions instead:
1530  * dba::select, dba::exists, dba::insert
1531  * dba::delete, dba::update, dba::p, dba::e
1532  *
1533  * @param $args Query parameters (1 to N parameters of different types)
1534  * @return array|bool Query array
1535  */
1536 function q($sql) {
1537         $args = func_get_args();
1538         unset($args[0]);
1539
1540         if (!dba::$connected) {
1541                 return false;
1542         }
1543
1544         $sql = dba::clean_query($sql);
1545         $sql = dba::any_value_fallback($sql);
1546
1547         $stmt = @vsprintf($sql, $args);
1548
1549         $ret = dba::p($stmt);
1550
1551         if (is_bool($ret)) {
1552                 return $ret;
1553         }
1554
1555         $columns = dba::columnCount($ret);
1556
1557         $data = dba::inArray($ret);
1558
1559         if ((count($data) == 0) && ($columns == 0)) {
1560                 return true;
1561         }
1562
1563         return $data;
1564 }
1565
1566 function dba_timer() {
1567         return microtime(true);
1568 }