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 $db_name = '';
  32
  33         public static function connect($serveraddr, $user, $pass, $db) {
  34                 if (!is_null(self::$db) && self::connected()) {
  35                         return true;
  36                 }
  37
  38                 $a = get_app();
  39
  40                 $stamp1 = microtime(true);
  41
  42                 // We are storing these values for being able to perform a reconnect
  43                 self::$db_serveraddr = $serveraddr;
  44                 self::$db_user = $user;
  45                 self::$db_pass = $pass;
  46                 self::$db_name = $db;
  47
  48                 $serveraddr = trim($serveraddr);
  49
  50                 $serverdata = explode(':', $serveraddr);
  51                 $server = $serverdata[0];
  52
  53                 if (count($serverdata) > 1) {
  54                         $port = trim($serverdata[1]);
  55                 }
  56
  57                 $server = trim($server);
  58                 $user = trim($user);
  59                 $pass = trim($pass);
  60                 $db = trim($db);
  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 (isset($a->config["system"]["db_charset"])) {
  75                                 $connect .= ";charset=".$a->config["system"]["db_charset"];
  76                         }
  77                         try {
  78                                 self::$db = @new PDO($connect, $user, $pass);
  79                                 self::$db->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
  80                                 self::$connected = true;
  81                         } catch (PDOException $e) {
  82                         }
  83                 }
  84
  85                 if (!self::$connected && class_exists('mysqli')) {
  86                         self::$driver = 'mysqli';
  87                         self::$db = @new mysqli($server, $user, $pass, $db, $port);
  88                         if (!mysqli_connect_errno()) {
  89                                 self::$connected = true;
  90
  91                                 if (isset($a->config["system"]["db_charset"])) {
  92                                         self::$db->set_charset($a->config["system"]["db_charset"]);
  93                                 }
  94                         }
  95                 }
  96
  97                 // No suitable SQL driver was found.
  98                 if (!self::$connected) {
  99                         self::$driver = null;
 100                         self::$db = null;
 101                 }
 102                 $a->save_timestamp($stamp1, "network");
 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);
 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                 $a = get_app();
 186
 187                 if (empty($a->config["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(',', $a->config["system"]["db_log_index_watch"]);
 207                 $blacklist = explode(',', $a->config["system"]["db_log_index_blacklist"]);
 208
 209                 while ($row = dba::fetch($r)) {
 210                         if ((intval($a->config["system"]["db_loglimit_index"]) > 0)) {
 211                                 $log = (in_array($row['key'], $watchlist) &&
 212                                         ($row['rows'] >= intval($a->config["system"]["db_loglimit_index"])));
 213                         } else {
 214                                 $log = false;
 215                         }
 216
 217                         if ((intval($a->config["system"]["db_loglimit_index_high"]) > 0) && ($row['rows'] >= intval($a->config["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                                 $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
 227                                 @file_put_contents($a->config["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 = $sql;
 386
 387                 if (x($a->config,'system') && x($a->config['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 (x($a->config,'system') && x($a->config['system'], 'db_log')) {
 549
 550                         $stamp2 = microtime(true);
 551                         $duration = (float)($stamp2 - $stamp1);
 552
 553                         if (($duration > $a->config["system"]["db_loglimit"])) {
 554                                 $duration = round($duration, 3);
 555                                 $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
 556
 557                                 @file_put_contents($a->config["system"]["db_log"], DateTimeFormat::utcNow()."\t".$duration."\t".
 558                                                 basename($backtrace[1]["file"])."\t".
 559                                                 $backtrace[1]["line"]."\t".$backtrace[2]["function"]."\t".
 560                                                 substr(self::replaceParameters($sql, $args), 0, 2000)."\n", FILE_APPEND);
 561                         }
 562                 }
 563                 return $retval;
 564         }
 565
 566         /**
 567          * @brief Executes a prepared statement like UPDATE or INSERT that doesn't return data
 568          *
 569          * Please use dba::delete, dba::insert, dba::update, ... instead
 570          *
 571          * @param string $sql SQL statement
 572          * @return boolean Was the query successfull? False is returned only if an error occurred
 573          */
 574         public static function e($sql) {
 575                 $a = get_app();
 576
 577                 $stamp = microtime(true);
 578
 579                 $params = self::getParam(func_get_args());
 580
 581                 // In a case of a deadlock we are repeating the query 20 times
 582                 $timeout = 20;
 583
 584                 do {
 585                         $stmt = self::p($sql, $params);
 586
 587                         if (is_bool($stmt)) {
 588                                 $retval = $stmt;
 589                         } elseif (is_object($stmt)) {
 590                                 $retval = true;
 591                         } else {
 592                                 $retval = false;
 593                         }
 594
 595                         self::close($stmt);
 596
 597                 } while ((self::$errorno == 1213) && (--$timeout > 0));
 598
 599                 if (self::$errorno != 0) {
 600                         // We have to preserve the error code, somewhere in the logging it get lost
 601                         $error = self::$error;
 602                         $errorno = self::$errorno;
 603
 604                         logger('DB Error '.self::$errorno.': '.self::$error."\n".
 605                                 System::callstack(8)."\n".self::replaceParameters($sql, $params));
 606
 607                         // On a lost connection we simply quit.
 608                         // A reconnect like in self::p could be dangerous with modifications
 609                         if ($errorno == 2006) {
 610                                 logger('Giving up because of database error '.$errorno.': '.$error);
 611                                 exit(1);
 612                         }
 613
 614                         self::$error = $error;
 615                         self::$errorno = $errorno;
 616                 }
 617
 618                 $a->save_timestamp($stamp, "database_write");
 619
 620                 return $retval;
 621         }
 622
 623         /**
 624          * @brief Check if data exists
 625          *
 626          * @param string $table Table name
 627          * @param array $condition array of fields for condition
 628          *
 629          * @return boolean Are there rows for that condition?
 630          */
 631         public static function exists($table, $condition) {
 632                 if (empty($table)) {
 633                         return false;
 634                 }
 635
 636                 $fields = [];
 637
 638                 reset($condition);
 639                 $first_key = key($condition);
 640                 if (!is_int($first_key)) {
 641                         $fields = [$first_key];
 642                 }
 643
 644                 $stmt = self::select($table, $fields, $condition, ['limit' => 1]);
 645
 646                 if (is_bool($stmt)) {
 647                         $retval = $stmt;
 648                 } else {
 649                         $retval = (self::num_rows($stmt) > 0);
 650                 }
 651
 652                 self::close($stmt);
 653
 654                 return $retval;
 655         }
 656
 657         /**
 658          * Fetches the first row
 659          *
 660          * Please use dba::selectFirst or dba::exists whenever this is possible.
 661          *
 662          * @brief Fetches the first row
 663          * @param string $sql SQL statement
 664          * @return array first row of query
 665          */
 666         public static function fetch_first($sql) {
 667                 $params = self::getParam(func_get_args());
 668
 669                 $stmt = self::p($sql, $params);
 670
 671                 if (is_bool($stmt)) {
 672                         $retval = $stmt;
 673                 } else {
 674                         $retval = self::fetch($stmt);
 675                 }
 676
 677                 self::close($stmt);
 678
 679                 return $retval;
 680         }
 681
 682         /**
 683          * @brief Returns the number of affected rows of the last statement
 684          *
 685          * @return int Number of rows
 686          */
 687         public static function affected_rows() {
 688                 return self::$affected_rows;
 689         }
 690
 691         /**
 692          * @brief Returns the number of columns of a statement
 693          *
 694          * @param object Statement object
 695          * @return int Number of columns
 696          */
 697         public static function columnCount($stmt) {
 698                 if (!is_object($stmt)) {
 699                         return 0;
 700                 }
 701                 switch (self::$driver) {
 702                         case 'pdo':
 703                                 return $stmt->columnCount();
 704                         case 'mysqli':
 705                                 return $stmt->field_count;
 706                 }
 707                 return 0;
 708         }
 709         /**
 710          * @brief Returns the number of rows of a statement
 711          *
 712          * @param PDOStatement|mysqli_result|mysqli_stmt Statement object
 713          * @return int Number of rows
 714          */
 715         public static function num_rows($stmt) {
 716                 if (!is_object($stmt)) {
 717                         return 0;
 718                 }
 719                 switch (self::$driver) {
 720                         case 'pdo':
 721                                 return $stmt->rowCount();
 722                         case 'mysqli':
 723                                 return $stmt->num_rows;
 724                 }
 725                 return 0;
 726         }
 727
 728         /**
 729          * @brief Fetch a single row
 730          *
 731          * @param mixed $stmt statement object
 732          * @return array current row
 733          */
 734         public static function fetch($stmt) {
 735                 $a = get_app();
 736
 737                 $stamp1 = microtime(true);
 738
 739                 $columns = [];
 740
 741                 if (!is_object($stmt)) {
 742                         return false;
 743                 }
 744
 745                 switch (self::$driver) {
 746                         case 'pdo':
 747                                 $columns = $stmt->fetch(PDO::FETCH_ASSOC);
 748                                 break;
 749                         case 'mysqli':
 750                                 if (get_class($stmt) == 'mysqli_result') {
 751                                         $columns = $stmt->fetch_assoc();
 752                                         break;
 753                                 }
 754
 755                                 // This code works, but is slow
 756
 757                                 // Bind the result to a result array
 758                                 $cols = [];
 759
 760                                 $cols_num = [];
 761                                 for ($x = 0; $x < $stmt->field_count; $x++) {
 762                                         $cols[] = &$cols_num[$x];
 763                                 }
 764
 765                                 call_user_func_array([$stmt, 'bind_result'], $cols);
 766
 767                                 if (!$stmt->fetch()) {
 768                                         return false;
 769                                 }
 770
 771                                 // The slow part:
 772                                 // We need to get the field names for the array keys
 773                                 // It seems that there is no better way to do this.
 774                                 $result = $stmt->result_metadata();
 775                                 $fields = $result->fetch_fields();
 776
 777                                 foreach ($cols_num AS $param => $col) {
 778                                         $columns[$fields[$param]->name] = $col;
 779                                 }
 780                 }
 781
 782                 $a->save_timestamp($stamp1, 'database');
 783
 784                 return $columns;
 785         }
 786
 787         /**
 788          * @brief Insert a row into a table
 789          *
 790          * @param string $table Table name
 791          * @param array $param parameter array
 792          * @param bool $on_duplicate_update Do an update on a duplicate entry
 793          *
 794          * @return boolean was the insert successfull?
 795          */
 796         public static function insert($table, $param, $on_duplicate_update = false) {
 797
 798                 if (empty($table) || empty($param)) {
 799                         logger('Table and fields have to be set');
 800                         return false;
 801                 }
 802
 803                 $sql = "INSERT INTO `".self::escape($table)."` (`".implode("`, `", array_keys($param))."`) VALUES (".
 804                         substr(str_repeat("?, ", count($param)), 0, -2).")";
 805
 806                 if ($on_duplicate_update) {
 807                         $sql .= " ON DUPLICATE KEY UPDATE `".implode("` = ?, `", array_keys($param))."` = ?";
 808
 809                         $values = array_values($param);
 810                         $param = array_merge_recursive($values, $values);
 811                 }
 812
 813                 return self::e($sql, $param);
 814         }
 815
 816         /**
 817          * @brief Fetch the id of the last insert command
 818          *
 819          * @return integer Last inserted id
 820          */
 821         public static function lastInsertId() {
 822                 switch (self::$driver) {
 823                         case 'pdo':
 824                                 $id = self::$db->lastInsertId();
 825                                 break;
 826                         case 'mysqli':
 827                                 $id = self::$db->insert_id;
 828                                 break;
 829                 }
 830                 return $id;
 831         }
 832
 833         /**
 834          * @brief Locks a table for exclusive write access
 835          *
 836          * This function can be extended in the future to accept a table array as well.
 837          *
 838          * @param string $table Table name
 839          *
 840          * @return boolean was the lock successful?
 841          */
 842         public static function lock($table) {
 843                 // See here: https://dev.mysql.com/doc/refman/5.7/en/lock-tables-and-transactions.html
 844                 if (self::$driver == 'pdo') {
 845                         self::e("SET autocommit=0");
 846                         self::$db->setAttribute(PDO::ATTR_EMULATE_PREPARES, true);
 847                 } else {
 848                         self::$db->autocommit(false);
 849                 }
 850
 851                 $success = self::e("LOCK TABLES `".self::escape($table)."` WRITE");
 852
 853                 if (self::$driver == 'pdo') {
 854                         self::$db->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
 855                 }
 856
 857                 if (!$success) {
 858                         if (self::$driver == 'pdo') {
 859                                 self::e("SET autocommit=1");
 860                         } else {
 861                                 self::$db->autocommit(true);
 862                         }
 863                 } else {
 864                         self::$in_transaction = true;
 865                 }
 866                 return $success;
 867         }
 868
 869         /**
 870          * @brief Unlocks all locked tables
 871          *
 872          * @return boolean was the unlock successful?
 873          */
 874         public static function unlock() {
 875                 // See here: https://dev.mysql.com/doc/refman/5.7/en/lock-tables-and-transactions.html
 876                 self::performCommit();
 877
 878                 if (self::$driver == 'pdo') {
 879                         self::$db->setAttribute(PDO::ATTR_EMULATE_PREPARES, true);
 880                 }
 881
 882                 $success = self::e("UNLOCK TABLES");
 883
 884                 if (self::$driver == 'pdo') {
 885                         self::$db->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
 886                         self::e("SET autocommit=1");
 887                 } else {
 888                         self::$db->autocommit(true);
 889                 }
 890
 891                 self::$in_transaction = false;
 892                 return $success;
 893         }
 894
 895         /**
 896          * @brief Starts a transaction
 897          *
 898          * @return boolean Was the command executed successfully?
 899          */
 900         public static function transaction() {
 901                 if (!self::performCommit()) {
 902                         return false;
 903                 }
 904
 905                 switch (self::$driver) {
 906                         case 'pdo':
 907                                 if (self::$db->inTransaction()) {
 908                                         break;
 909                                 }
 910                                 if (!self::$db->beginTransaction()) {
 911                                         return false;
 912                                 }
 913                                 break;
 914                         case 'mysqli':
 915                                 if (!self::$db->begin_transaction()) {
 916                                         return false;
 917                                 }
 918                                 break;
 919                 }
 920
 921                 self::$in_transaction = true;
 922                 return true;
 923         }
 924
 925         private static function performCommit()
 926         {
 927                 switch (self::$driver) {
 928                         case 'pdo':
 929                                 if (!self::$db->inTransaction()) {
 930                                         return true;
 931                                 }
 932                                 return self::$db->commit();
 933                         case 'mysqli':
 934                                 return self::$db->commit();
 935                 }
 936                 return true;
 937         }
 938
 939         /**
 940          * @brief Does a commit
 941          *
 942          * @return boolean Was the command executed successfully?
 943          */
 944         public static function commit() {
 945                 if (!self::performCommit()) {
 946                         return false;
 947                 }
 948                 self::$in_transaction = false;
 949                 return true;
 950         }
 951
 952         /**
 953          * @brief Does a rollback
 954          *
 955          * @return boolean Was the command executed successfully?
 956          */
 957         public static function rollback() {
 958                 switch (self::$driver) {
 959                         case 'pdo':
 960                                 if (!self::$db->inTransaction()) {
 961                                         $ret = true;
 962                                         break;
 963                                 }
 964                                 $ret = self::$db->rollBack();
 965                                 break;
 966                         case 'mysqli':
 967                                 $ret = self::$db->rollback();
 968                                 break;
 969                 }
 970                 self::$in_transaction = false;
 971                 return $ret;
 972         }
 973
 974         /**
 975          * @brief Build the array with the table relations
 976          *
 977          * The array is build from the database definitions in DBStructure.php
 978          *
 979          * This process must only be started once, since the value is cached.
 980          */
 981         private static function buildRelationData() {
 982                 $definition = DBStructure::definition();
 983
 984                 foreach ($definition AS $table => $structure) {
 985                         foreach ($structure['fields'] AS $field => $field_struct) {
 986                                 if (isset($field_struct['relation'])) {
 987                                         foreach ($field_struct['relation'] AS $rel_table => $rel_field) {
 988                                                 self::$relation[$rel_table][$rel_field][$table][] = $field;
 989                                         }
 990                                 }
 991                         }
 992                 }
 993         }
 994
 995         /**
 996          * @brief Delete a row from a table
 997          *
 998          * @param string  $table       Table name
 999          * @param array   $conditions  Field condition(s)
1000          * @param array   $options
1001          *                - cascade: If true we delete records in other tables that depend on the one we're deleting through
1002          *                           relations (default: true)
1003          * @param boolean $in_process  Internal use: Only do a commit after the last delete
1004          * @param array   $callstack   Internal use: prevent endless loops
1005          *
1006          * @return boolean|array was the delete successful? When $in_process is set: deletion data
1007          */
1008         public static function delete($table, array $conditions, array $options = [], $in_process = false, array &$callstack = [])
1009         {
1010                 if (empty($table) || empty($conditions)) {
1011                         logger('Table and conditions have to be set');
1012                         return false;
1013                 }
1014
1015                 $commands = [];
1016
1017                 // Create a key for the loop prevention
1018                 $key = $table . ':' . json_encode($conditions);
1019
1020                 // We quit when this key already exists in the callstack.
1021                 if (isset($callstack[$key])) {
1022                         return $commands;
1023                 }
1024
1025                 $callstack[$key] = true;
1026
1027                 $table = self::escape($table);
1028
1029                 $commands[$key] = ['table' => $table, 'conditions' => $conditions];
1030
1031                 $cascade = defaults($options, 'cascade', true);
1032
1033                 // To speed up the whole process we cache the table relations
1034                 if ($cascade && count(self::$relation) == 0) {
1035                         self::buildRelationData();
1036                 }
1037
1038                 // Is there a relation entry for the table?
1039                 if ($cascade && isset(self::$relation[$table])) {
1040                         // We only allow a simple "one field" relation.
1041                         $field = array_keys(self::$relation[$table])[0];
1042                         $rel_def = array_values(self::$relation[$table])[0];
1043
1044                         // Create a key for preventing double queries
1045                         $qkey = $field . '-' . $table . ':' . json_encode($conditions);
1046
1047                         // When the search field is the relation field, we don't need to fetch the rows
1048                         // This is useful when the leading record is already deleted in the frontend but the rest is done in the backend
1049                         if ((count($conditions) == 1) && ($field == array_keys($conditions)[0])) {
1050                                 foreach ($rel_def AS $rel_table => $rel_fields) {
1051                                         foreach ($rel_fields AS $rel_field) {
1052                                                 $retval = self::delete($rel_table, [$rel_field => array_values($conditions)[0]], $options, true, $callstack);
1053                                                 $commands = array_merge($commands, $retval);
1054                                         }
1055                                 }
1056                                 // We quit when this key already exists in the callstack.
1057                         } elseif (!isset($callstack[$qkey])) {
1058
1059                                 $callstack[$qkey] = true;
1060
1061                                 // Fetch all rows that are to be deleted
1062                                 $data = self::select($table, [$field], $conditions);
1063
1064                                 while ($row = self::fetch($data)) {
1065                                         // Now we accumulate the delete commands
1066                                         $retval = self::delete($table, [$field => $row[$field]], $options, true, $callstack);
1067                                         $commands = array_merge($commands, $retval);
1068                                 }
1069
1070                                 self::close($data);
1071
1072                                 // Since we had split the delete command we don't need the original command anymore
1073                                 unset($commands[$key]);
1074                         }
1075                 }
1076
1077                 if (!$in_process) {
1078                         // Now we finalize the process
1079                         $do_transaction = !self::$in_transaction;
1080
1081                         if ($do_transaction) {
1082                                 self::transaction();
1083                         }
1084
1085                         $compacted = [];
1086                         $counter = [];
1087
1088                         foreach ($commands AS $command) {
1089                                 $conditions = $command['conditions'];
1090                                 reset($conditions);
1091                                 $first_key = key($conditions);
1092
1093                                 $condition_string = self::buildCondition($conditions);
1094
1095                                 if ((count($command['conditions']) > 1) || is_int($first_key)) {
1096                                         $sql = "DELETE FROM `" . $command['table'] . "`" . $condition_string;
1097                                         logger(self::replaceParameters($sql, $conditions), LOGGER_DATA);
1098
1099                                         if (!self::e($sql, $conditions)) {
1100                                                 if ($do_transaction) {
1101                                                         self::rollback();
1102                                                 }
1103                                                 return false;
1104                                         }
1105                                 } else {
1106                                         $key_table = $command['table'];
1107                                         $key_condition = array_keys($command['conditions'])[0];
1108                                         $value = array_values($command['conditions'])[0];
1109
1110                                         // Split the SQL queries in chunks of 100 values
1111                                         // We do the $i stuff here to make the code better readable
1112                                         $i = $counter[$key_table][$key_condition];
1113                                         if (isset($compacted[$key_table][$key_condition][$i]) && count($compacted[$key_table][$key_condition][$i]) > 100) {
1114                                                 ++$i;
1115                                         }
1116
1117                                         $compacted[$key_table][$key_condition][$i][$value] = $value;
1118                                         $counter[$key_table][$key_condition] = $i;
1119                                 }
1120                         }
1121                         foreach ($compacted AS $table => $values) {
1122                                 foreach ($values AS $field => $field_value_list) {
1123                                         foreach ($field_value_list AS $field_values) {
1124                                                 $sql = "DELETE FROM `" . $table . "` WHERE `" . $field . "` IN (" .
1125                                                         substr(str_repeat("?, ", count($field_values)), 0, -2) . ");";
1126
1127                                                 logger(self::replaceParameters($sql, $field_values), LOGGER_DATA);
1128
1129                                                 if (!self::e($sql, $field_values)) {
1130                                                         if ($do_transaction) {
1131                                                                 self::rollback();
1132                                                         }
1133                                                         return false;
1134                                                 }
1135                                         }
1136                                 }
1137                         }
1138                         if ($do_transaction) {
1139                                 self::commit();
1140                         }
1141                         return true;
1142                 }
1143
1144                 return $commands;
1145         }
1146
1147         /**
1148          * @brief Updates rows
1149          *
1150          * Updates rows in the database. When $old_fields is set to an array,
1151          * the system will only do an update if the fields in that array changed.
1152          *
1153          * Attention:
1154          * Only the values in $old_fields are compared.
1155          * This is an intentional behaviour.
1156          *
1157          * Example:
1158          * We include the timestamp field in $fields but not in $old_fields.
1159          * Then the row will only get the new timestamp when the other fields had changed.
1160          *
1161          * When $old_fields is set to a boolean value the system will do this compare itself.
1162          * When $old_fields is set to "true" the system will do an insert if the row doesn't exists.
1163          *
1164          * Attention:
1165          * Only set $old_fields to a boolean value when you are sure that you will update a single row.
1166          * When you set $old_fields to "true" then $fields must contain all relevant fields!
1167          *
1168          * @param string $table Table name
1169          * @param array $fields contains the fields that are updated
1170          * @param array $condition condition array with the key values
1171          * @param array|boolean $old_fields array with the old field values that are about to be replaced (true = update on duplicate)
1172          *
1173          * @return boolean was the update successfull?
1174          */
1175         public static function update($table, $fields, $condition, $old_fields = []) {
1176
1177                 if (empty($table) || empty($fields) || empty($condition)) {
1178                         logger('Table, fields and condition have to be set');
1179                         return false;
1180                 }
1181
1182                 $table = self::escape($table);
1183
1184                 $condition_string = self::buildCondition($condition);
1185
1186                 if (is_bool($old_fields)) {
1187                         $do_insert = $old_fields;
1188
1189                         $old_fields = self::selectFirst($table, [], $condition);
1190
1191                         if (is_bool($old_fields)) {
1192                                 if ($do_insert) {
1193                                         $values = array_merge($condition, $fields);
1194                                         return self::insert($table, $values, $do_insert);
1195                                 }
1196                                 $old_fields = [];
1197                         }
1198                 }
1199
1200                 $do_update = (count($old_fields) == 0);
1201
1202                 foreach ($old_fields AS $fieldname => $content) {
1203                         if (isset($fields[$fieldname])) {
1204                                 if ($fields[$fieldname] == $content) {
1205                                         unset($fields[$fieldname]);
1206                                 } else {
1207                                         $do_update = true;
1208                                 }
1209                         }
1210                 }
1211
1212                 if (!$do_update || (count($fields) == 0)) {
1213                         return true;
1214                 }
1215
1216                 $sql = "UPDATE `".$table."` SET `".
1217                         implode("` = ?, `", array_keys($fields))."` = ?".$condition_string;
1218
1219                 $params1 = array_values($fields);
1220                 $params2 = array_values($condition);
1221                 $params = array_merge_recursive($params1, $params2);
1222
1223                 return self::e($sql, $params);
1224         }
1225
1226         /**
1227          * Retrieve a single record from a table and returns it in an associative array
1228          *
1229          * @brief Retrieve a single record from a table
1230          * @param string $table
1231          * @param array  $fields
1232          * @param array  $condition
1233          * @param array  $params
1234          * @return bool|array
1235          * @see dba::select
1236          */
1237         public static function selectFirst($table, array $fields = [], array $condition = [], $params = [])
1238         {
1239                 $params['limit'] = 1;
1240                 $result = self::select($table, $fields, $condition, $params);
1241
1242                 if (is_bool($result)) {
1243                         return $result;
1244                 } else {
1245                         $row = self::fetch($result);
1246                         self::close($result);
1247                         return $row;
1248                 }
1249         }
1250
1251         /**
1252          * @brief Select rows from a table
1253          *
1254          * @param string $table     Table name
1255          * @param array  $fields    Array of selected fields, empty for all
1256          * @param array  $condition Array of fields for condition
1257          * @param array  $params    Array of several parameters
1258          *
1259          * @return boolean|object
1260          *
1261          * Example:
1262          * $table = "item";
1263          * $fields = array("id", "uri", "uid", "network");
1264          *
1265          * $condition = array("uid" => 1, "network" => 'dspr');
1266          * or:
1267          * $condition = array("`uid` = ? AND `network` IN (?, ?)", 1, 'dfrn', 'dspr');
1268          *
1269          * $params = array("order" => array("id", "received" => true), "limit" => 10);
1270          *
1271          * $data = dba::select($table, $fields, $condition, $params);
1272          */
1273         public static function select($table, array $fields = [], array $condition = [], array $params = [])
1274         {
1275                 if ($table == '') {
1276                         return false;
1277                 }
1278
1279                 $table = self::escape($table);
1280
1281                 if (count($fields) > 0) {
1282                         $select_fields = "`" . implode("`, `", array_values($fields)) . "`";
1283                 } else {
1284                         $select_fields = "*";
1285                 }
1286
1287                 $condition_string = self::buildCondition($condition);
1288
1289                 $param_string = self::buildParameter($params);
1290
1291                 $sql = "SELECT " . $select_fields . " FROM `" . $table . "`" . $condition_string . $param_string;
1292
1293                 $result = self::p($sql, $condition);
1294
1295                 return $result;
1296         }
1297
1298         /**
1299          * @brief Counts the rows from a table satisfying the provided condition
1300          *
1301          * @param string $table Table name
1302          * @param array $condition array of fields for condition
1303          *
1304          * @return int
1305          *
1306          * Example:
1307          * $table = "item";
1308          *
1309          * $condition = ["uid" => 1, "network" => 'dspr'];
1310          * or:
1311          * $condition = ["`uid` = ? AND `network` IN (?, ?)", 1, 'dfrn', 'dspr'];
1312          *
1313          * $count = dba::count($table, $condition);
1314          */
1315         public static function count($table, array $condition = [])
1316         {
1317                 if ($table == '') {
1318                         return false;
1319                 }
1320
1321                 $condition_string = self::buildCondition($condition);
1322
1323                 $sql = "SELECT COUNT(*) AS `count` FROM `".$table."`".$condition_string;
1324
1325                 $row = self::fetch_first($sql, $condition);
1326
1327                 return $row['count'];
1328         }
1329
1330         /**
1331          * @brief Returns the SQL condition string built from the provided condition array
1332          *
1333          * This function operates with two modes.
1334          * - Supplied with a filed/value associative array, it builds simple strict
1335          *   equality conditions linked by AND.
1336          * - Supplied with a flat list, the first element is the condition string and
1337          *   the following arguments are the values to be interpolated
1338          *
1339          * $condition = ["uid" => 1, "network" => 'dspr'];
1340          * or:
1341          * $condition = ["`uid` = ? AND `network` IN (?, ?)", 1, 'dfrn', 'dspr'];
1342          *
1343          * In either case, the provided array is left with the parameters only
1344          *
1345          * @param array $condition
1346          * @return string
1347          */
1348         public static function buildCondition(array &$condition = [])
1349         {
1350                 $condition_string = '';
1351                 if (count($condition) > 0) {
1352                         reset($condition);
1353                         $first_key = key($condition);
1354                         if (is_int($first_key)) {
1355                                 $condition_string = " WHERE (" . array_shift($condition) . ")";
1356                         } else {
1357                                 $new_values = [];
1358                                 $condition_string = "";
1359                                 foreach ($condition as $field => $value) {
1360                                         if ($condition_string != "") {
1361                                                 $condition_string .= " AND ";
1362                                         }
1363                                         if (is_array($value)) {
1364                                                 /* Workaround for MySQL Bug #64791.
1365                                                  * Never mix data types inside any IN() condition.
1366                                                  * In case of mixed types, cast all as string.
1367                                                  * Logic needs to be consistent with dba::p() data types.
1368                                                  */
1369                                                 $is_int = false;
1370                                                 $is_alpha = false;
1371                                                 foreach ($value as $single_value) {
1372                                                         if (is_int($single_value)) {
1373                                                                 $is_int = true;
1374                                                         } else {
1375                                                                 $is_alpha = true;
1376                                                         }
1377                                                 }
1378
1379                                                 if ($is_int && $is_alpha) {
1380                                                         foreach ($value as &$ref) {
1381                                                                 if (is_int($ref)) {
1382                                                                         $ref = (string)$ref;
1383                                                                 }
1384                                                         }
1385                                                         unset($ref); //Prevent accidental re-use.
1386                                                 }
1387
1388                                                 $new_values = array_merge($new_values, array_values($value));
1389                                                 $placeholders = substr(str_repeat("?, ", count($value)), 0, -2);
1390                                                 $condition_string .= "`" . $field . "` IN (" . $placeholders . ")";
1391                                         } else {
1392                                                 $new_values[$field] = $value;
1393                                                 $condition_string .= "`" . $field . "` = ?";
1394                                         }
1395                                 }
1396                                 $condition_string = " WHERE (" . $condition_string . ")";
1397                                 $condition = $new_values;
1398                         }
1399                 }
1400
1401                 return $condition_string;
1402         }
1403
1404         /**
1405          * @brief Returns the SQL parameter string built from the provided parameter array
1406          *
1407          * @param array $params
1408          * @return string
1409          */
1410         public static function buildParameter(array $params = [])
1411         {
1412                 $order_string = '';
1413                 if (isset($params['order'])) {
1414                         $order_string = " ORDER BY ";
1415                         foreach ($params['order'] AS $fields => $order) {
1416                                 if (!is_int($fields)) {
1417                                         $order_string .= "`" . $fields . "` " . ($order ? "DESC" : "ASC") . ", ";
1418                                 } else {
1419                                         $order_string .= "`" . $order . "`, ";
1420                                 }
1421                         }
1422                         $order_string = substr($order_string, 0, -2);
1423                 }
1424
1425                 $limit_string = '';
1426                 if (isset($params['limit']) && is_int($params['limit'])) {
1427                         $limit_string = " LIMIT " . $params['limit'];
1428                 }
1429
1430                 if (isset($params['limit']) && is_array($params['limit'])) {
1431                         $limit_string = " LIMIT " . intval($params['limit'][0]) . ", " . intval($params['limit'][1]);
1432                 }
1433
1434                 return $order_string.$limit_string;
1435         }
1436
1437         /**
1438          * @brief Fills an array with data from a query
1439          *
1440          * @param object $stmt statement object
1441          * @return array Data array
1442          */
1443         public static function inArray($stmt, $do_close = true) {
1444                 if (is_bool($stmt)) {
1445                         return $stmt;
1446                 }
1447
1448                 $data = [];
1449                 while ($row = self::fetch($stmt)) {
1450                         $data[] = $row;
1451                 }
1452                 if ($do_close) {
1453                         self::close($stmt);
1454                 }
1455                 return $data;
1456         }
1457
1458         /**
1459          * @brief Returns the error number of the last query
1460          *
1461          * @return string Error number (0 if no error)
1462          */
1463         public static function errorNo() {
1464                 return self::$errorno;
1465         }
1466
1467         /**
1468          * @brief Returns the error message of the last query
1469          *
1470          * @return string Error message ('' if no error)
1471          */
1472         public static function errorMessage() {
1473                 return self::$error;
1474         }
1475
1476         /**
1477          * @brief Closes the current statement
1478          *
1479          * @param object $stmt statement object
1480          * @return boolean was the close successful?
1481          */
1482         public static function close($stmt) {
1483                 $a = get_app();
1484
1485                 $stamp1 = microtime(true);
1486
1487                 if (!is_object($stmt)) {
1488                         return false;
1489                 }
1490
1491                 switch (self::$driver) {
1492                         case 'pdo':
1493                                 $ret = $stmt->closeCursor();
1494                                 break;
1495                         case 'mysqli':
1496                                 // MySQLi offers both a mysqli_stmt and a mysqli_result class.
1497                                 // We should be careful not to assume the object type of $stmt
1498                                 // because dba::p() has been able to return both types.
1499                                 if ($stmt instanceof mysqli_stmt) {
1500                                         $stmt->free_result();
1501                                         $ret = $stmt->close();
1502                                 } elseif ($stmt instanceof mysqli_result) {
1503                                         $stmt->free();
1504                                         $ret = true;
1505                                 } else {
1506                                         $ret = false;
1507                                 }
1508                                 break;
1509                 }
1510
1511                 $a->save_timestamp($stamp1, 'database');
1512
1513                 return $ret;
1514         }
1515 }
1516
1517 function dbesc($str) {
1518         if (dba::$connected) {
1519                 return(dba::escape($str));
1520         } else {
1521                 return(str_replace("'","\\'",$str));
1522         }
1523 }
1524
1525 /**
1526  * @brief execute SQL query with printf style args - deprecated
1527  *
1528  * Please use the dba:: functions instead:
1529  * dba::select, dba::exists, dba::insert
1530  * dba::delete, dba::update, dba::p, dba::e
1531  *
1532  * @param $args Query parameters (1 to N parameters of different types)
1533  * @return array|bool Query array
1534  */
1535 function q($sql) {
1536         $args = func_get_args();
1537         unset($args[0]);
1538
1539         if (!dba::$connected) {
1540                 return false;
1541         }
1542
1543         $sql = dba::clean_query($sql);
1544         $sql = dba::any_value_fallback($sql);
1545
1546         $stmt = @vsprintf($sql, $args);
1547
1548         $ret = dba::p($stmt);
1549
1550         if (is_bool($ret)) {
1551                 return $ret;
1552         }
1553
1554         $columns = dba::columnCount($ret);
1555
1556         $data = dba::inArray($ret);
1557
1558         if ((count($data) == 0) && ($columns == 0)) {
1559                 return true;
1560         }
1561
1562         return $data;
1563 }
1564
1565 function dba_timer() {
1566         return microtime(true);
1567 }