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