include/dba.php

   1 <?php
   2 require_once("dbm.php");
   3 require_once('include/datetime.php');
   4
   5 /**
   6  * @class MySQL database class
   7  *
   8  * For debugging, insert 'dbg(1);' anywhere in the program flow.
   9  * dbg(0); will turn it off. Logging is performed at LOGGER_DATA level.
  10  * When logging, all binary info is converted to text and html entities are escaped so that
  11  * the debugging stream is safe to view within both terminals and web pages.
  12  *
  13  * This class is for the low level database stuff that does driver specific things.
  14  */
  15
  16 class dba {
  17
  18         private $debug = 0;
  19         private $db;
  20         private $result;
  21         private $driver;
  22         public  $connected = false;
  23         public  $error = false;
  24         public  $errorno = 0;
  25         public  $affected_rows = 0;
  26         private $_server_info = '';
  27         private static $in_transaction = false;
  28         private static $dbo;
  29         private static $relation = array();
  30
  31         function __construct($serveraddr, $user, $pass, $db, $install = false) {
  32                 $a = get_app();
  33
  34                 $stamp1 = microtime(true);
  35
  36                 $serveraddr = trim($serveraddr);
  37
  38                 $serverdata = explode(':', $serveraddr);
  39                 $server = $serverdata[0];
  40
  41                 if (count($serverdata) > 1) {
  42                         $port = trim($serverdata[1]);
  43                 }
  44
  45                 $server = trim($server);
  46                 $user = trim($user);
  47                 $pass = trim($pass);
  48                 $db = trim($db);
  49
  50                 if (!(strlen($server) && strlen($user))) {
  51                         $this->connected = false;
  52                         $this->db = null;
  53                         return;
  54                 }
  55
  56                 if ($install) {
  57                         if (strlen($server) && ($server !== 'localhost') && ($server !== '127.0.0.1')) {
  58                                 if (! dns_get_record($server, DNS_A + DNS_CNAME + DNS_PTR)) {
  59                                         $this->error = sprintf(t('Cannot locate DNS info for database server \'%s\''), $server);
  60                                         $this->connected = false;
  61                                         $this->db = null;
  62                                         return;
  63                                 }
  64                         }
  65                 }
  66
  67                 if (class_exists('\PDO') && in_array('mysql', PDO::getAvailableDrivers())) {
  68                         $this->driver = 'pdo';
  69                         $connect = "mysql:host=".$server.";dbname=".$db;
  70
  71                         if (isset($port)) {
  72                                 $connect .= ";port=".$port;
  73                         }
  74
  75                         if (isset($a->config["system"]["db_charset"])) {
  76                                 $connect .= ";charset=".$a->config["system"]["db_charset"];
  77                         }
  78                         try {
  79                                 $this->db = @new PDO($connect, $user, $pass);
  80                                 $this->connected = true;
  81                         } catch (PDOException $e) {
  82                                 $this->connected = false;
  83                         }
  84                 }
  85
  86                 if (!$this->connected && class_exists('mysqli')) {
  87                         $this->driver = 'mysqli';
  88                         $this->db = @new mysqli($server, $user, $pass, $db, $port);
  89                         if (!mysqli_connect_errno()) {
  90                                 $this->connected = true;
  91
  92                                 if (isset($a->config["system"]["db_charset"])) {
  93                                         $this->db->set_charset($a->config["system"]["db_charset"]);
  94                                 }
  95                         }
  96                 }
  97
  98                 if (!$this->connected && function_exists('mysql_connect')) {
  99                         $this->driver = 'mysql';
 100                         $this->db = mysql_connect($serveraddr, $user, $pass);
 101                         if ($this->db && mysql_select_db($db, $this->db)) {
 102                                 $this->connected = true;
 103
 104                                 if (isset($a->config["system"]["db_charset"])) {
 105                                         mysql_set_charset($a->config["system"]["db_charset"], $this->db);
 106                                 }
 107                         }
 108                 }
 109
 110                 // No suitable SQL driver was found.
 111                 if (!$this->connected) {
 112                         $this->db = null;
 113                         if (!$install) {
 114                                 system_unavailable();
 115                         }
 116                 }
 117                 $a->save_timestamp($stamp1, "network");
 118
 119                 self::$dbo = $this;
 120         }
 121
 122         /**
 123          * @brief Returns the MySQL server version string
 124          *
 125          * This function discriminate between the deprecated mysql API and the current
 126          * object-oriented mysqli API. Example of returned string: 5.5.46-0+deb8u1
 127          *
 128          * @return string
 129          */
 130         public function server_info() {
 131                 if ($this->_server_info == '') {
 132                         switch ($this->driver) {
 133                                 case 'pdo':
 134                                         $this->_server_info = $this->db->getAttribute(PDO::ATTR_SERVER_VERSION);
 135                                         break;
 136                                 case 'mysqli':
 137                                         $this->_server_info = $this->db->server_info;
 138                                         break;
 139                                 case 'mysql':
 140                                         $this->_server_info = mysql_get_server_info($this->db);
 141                                         break;
 142                         }
 143                 }
 144                 return $this->_server_info;
 145         }
 146
 147         /**
 148          * @brief Returns the selected database name
 149          *
 150          * @return string
 151          */
 152         public function database_name() {
 153                 $r = $this->q("SELECT DATABASE() AS `db`");
 154
 155                 return $r[0]['db'];
 156         }
 157
 158         /**
 159          * @brief Analyze a database query and log this if some conditions are met.
 160          *
 161          * @param string $query The database query that will be analyzed
 162          */
 163         public function log_index($query) {
 164                 $a = get_app();
 165
 166                 if (empty($a->config["system"]["db_log_index"])) {
 167                         return;
 168                 }
 169
 170                 // Don't explain an explain statement
 171                 if (strtolower(substr($query, 0, 7)) == "explain") {
 172                         return;
 173                 }
 174
 175                 // Only do the explain on "select", "update" and "delete"
 176                 if (!in_array(strtolower(substr($query, 0, 6)), array("select", "update", "delete"))) {
 177                         return;
 178                 }
 179
 180                 $r = $this->q("EXPLAIN ".$query);
 181                 if (!dbm::is_result($r)) {
 182                         return;
 183                 }
 184
 185                 $watchlist = explode(',', $a->config["system"]["db_log_index_watch"]);
 186                 $blacklist = explode(',', $a->config["system"]["db_log_index_blacklist"]);
 187
 188                 foreach ($r AS $row) {
 189                         if ((intval($a->config["system"]["db_loglimit_index"]) > 0)) {
 190                                 $log = (in_array($row['key'], $watchlist) &&
 191                                         ($row['rows'] >= intval($a->config["system"]["db_loglimit_index"])));
 192                         } else {
 193                                 $log = false;
 194                         }
 195
 196                         if ((intval($a->config["system"]["db_loglimit_index_high"]) > 0) && ($row['rows'] >= intval($a->config["system"]["db_loglimit_index_high"]))) {
 197                                 $log = true;
 198                         }
 199
 200                         if (in_array($row['key'], $blacklist) || ($row['key'] == "")) {
 201                                 $log = false;
 202                         }
 203
 204                         if ($log) {
 205                                 $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
 206                                 @file_put_contents($a->config["system"]["db_log_index"], datetime_convert()."\t".
 207                                                 $row['key']."\t".$row['rows']."\t".$row['Extra']."\t".
 208                                                 basename($backtrace[1]["file"])."\t".
 209                                                 $backtrace[1]["line"]."\t".$backtrace[2]["function"]."\t".
 210                                                 substr($query, 0, 2000)."\n", FILE_APPEND);
 211                         }
 212                 }
 213         }
 214
 215         public function q($sql, $onlyquery = false) {
 216                 $a = get_app();
 217
 218                 if (!$this->db || !$this->connected) {
 219                         return false;
 220                 }
 221
 222                 $this->error = '';
 223
 224                 $connstr = ($this->connected() ? "Connected" : "Disonnected");
 225
 226                 $stamp1 = microtime(true);
 227
 228                 $orig_sql = $sql;
 229
 230                 if (x($a->config,'system') && x($a->config['system'], 'db_callstack')) {
 231                         $sql = "/*".$a->callstack()." */ ".$sql;
 232                 }
 233
 234                 $columns = 0;
 235
 236                 switch ($this->driver) {
 237                         case 'pdo':
 238                                 $result = @$this->db->query($sql);
 239                                 // Is used to separate between queries that returning data - or not
 240                                 if (!is_bool($result)) {
 241                                         $columns = $result->columnCount();
 242                                 }
 243                                 break;
 244                         case 'mysqli':
 245                                 $result = @$this->db->query($sql);
 246                                 break;
 247                         case 'mysql':
 248                                 $result = @mysql_query($sql,$this->db);
 249                                 break;
 250                 }
 251                 $stamp2 = microtime(true);
 252                 $duration = (float)($stamp2 - $stamp1);
 253
 254                 $a->save_timestamp($stamp1, "database");
 255
 256                 if (strtolower(substr($orig_sql, 0, 6)) != "select") {
 257                         $a->save_timestamp($stamp1, "database_write");
 258                 }
 259                 if (x($a->config,'system') && x($a->config['system'],'db_log')) {
 260                         if (($duration > $a->config["system"]["db_loglimit"])) {
 261                                 $duration = round($duration, 3);
 262                                 $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
 263                                 @file_put_contents($a->config["system"]["db_log"], datetime_convert()."\t".$duration."\t".
 264                                                 basename($backtrace[1]["file"])."\t".
 265                                                 $backtrace[1]["line"]."\t".$backtrace[2]["function"]."\t".
 266                                                 substr($sql, 0, 2000)."\n", FILE_APPEND);
 267                         }
 268                 }
 269
 270                 switch ($this->driver) {
 271                         case 'pdo':
 272                                 $errorInfo = $this->db->errorInfo();
 273                                 if ($errorInfo) {
 274                                         $this->error = $errorInfo[2];
 275                                         $this->errorno = $errorInfo[1];
 276                                 }
 277                                 break;
 278                         case 'mysqli':
 279                                 if ($this->db->errno) {
 280                                         $this->error = $this->db->error;
 281                                         $this->errorno = $this->db->errno;
 282                                 }
 283                                 break;
 284                         case 'mysql':
 285                                 if (mysql_errno($this->db)) {
 286                                         $this->error = mysql_error($this->db);
 287                                         $this->errorno = mysql_errno($this->db);
 288                                 }
 289                                 break;
 290                 }
 291                 if (strlen($this->error)) {
 292                         logger('DB Error ('.$connstr.') '.$this->errorno.': '.$this->error);
 293                 }
 294
 295                 if ($this->debug) {
 296
 297                         $mesg = '';
 298
 299                         if ($result === false) {
 300                                 $mesg = 'false';
 301                         } elseif ($result === true) {
 302                                 $mesg = 'true';
 303                         } else {
 304                                 switch ($this->driver) {
 305                                         case 'pdo':
 306                                                 $mesg = $result->rowCount().' results'.EOL;
 307                                                 break;
 308                                         case 'mysqli':
 309                                                 $mesg = $result->num_rows.' results'.EOL;
 310                                                 break;
 311                                         case 'mysql':
 312                                                 $mesg = mysql_num_rows($result).' results'.EOL;
 313                                                 break;
 314                                 }
 315                         }
 316
 317                         $str =  'SQL = ' . printable($sql) . EOL . 'SQL returned ' . $mesg
 318                                 . (($this->error) ? ' error: ' . $this->error : '')
 319                                 . EOL;
 320
 321                         logger('dba: ' . $str );
 322                 }
 323
 324                 /**
 325                  * If dbfail.out exists, we will write any failed calls directly to it,
 326                  * regardless of any logging that may or may nor be in effect.
 327                  * These usually indicate SQL syntax errors that need to be resolved.
 328                  */
 329
 330                 if ($result === false) {
 331                         logger('dba: ' . printable($sql) . ' returned false.' . "\n" . $this->error);
 332                         if (file_exists('dbfail.out')) {
 333                                 file_put_contents('dbfail.out', datetime_convert() . "\n" . printable($sql) . ' returned false' . "\n" . $this->error . "\n", FILE_APPEND);
 334                         }
 335                 }
 336
 337                 if (is_bool($result)) {
 338                         return $result;
 339                 }
 340                 if ($onlyquery) {
 341                         $this->result = $result;
 342                         return true;
 343                 }
 344
 345                 $r = array();
 346                 switch ($this->driver) {
 347                         case 'pdo':
 348                                 while ($x = $result->fetch(PDO::FETCH_ASSOC)) {
 349                                         $r[] = $x;
 350                                 }
 351                                 $result->closeCursor();
 352                                 break;
 353                         case 'mysqli':
 354                                 while ($x = $result->fetch_array(MYSQLI_ASSOC)) {
 355                                         $r[] = $x;
 356                                 }
 357                                 $result->free_result();
 358                                 break;
 359                         case 'mysql':
 360                                 while ($x = mysql_fetch_array($result, MYSQL_ASSOC)) {
 361                                         $r[] = $x;
 362                                 }
 363                                 mysql_free_result($result);
 364                                 break;
 365                 }
 366
 367                 // PDO doesn't return "true" on successful operations - like mysqli does
 368                 // Emulate this behaviour by checking if the query returned data and had columns
 369                 // This should be reliable enough
 370                 if (($this->driver == 'pdo') && (count($r) == 0) && ($columns == 0)) {
 371                         return true;
 372                 }
 373
 374                 //$a->save_timestamp($stamp1, "database");
 375
 376                 if ($this->debug) {
 377                         logger('dba: ' . printable(print_r($r, true)));
 378                 }
 379                 return($r);
 380         }
 381
 382         public function dbg($dbg) {
 383                 $this->debug = $dbg;
 384         }
 385
 386         public function escape($str) {
 387                 if ($this->db && $this->connected) {
 388                         switch ($this->driver) {
 389                                 case 'pdo':
 390                                         return substr(@$this->db->quote($str, PDO::PARAM_STR), 1, -1);
 391                                 case 'mysqli':
 392                                         return @$this->db->real_escape_string($str);
 393                                 case 'mysql':
 394                                         return @mysql_real_escape_string($str,$this->db);
 395                         }
 396                 }
 397         }
 398
 399         function connected() {
 400                 switch ($this->driver) {
 401                         case 'pdo':
 402                                 // Not sure if this really is working like expected
 403                                 $connected = ($this->db->getAttribute(PDO::ATTR_CONNECTION_STATUS) != "");
 404                                 break;
 405                         case 'mysqli':
 406                                 $connected = $this->db->ping();
 407                                 break;
 408                         case 'mysql':
 409                                 $connected = mysql_ping($this->db);
 410                                 break;
 411                 }
 412                 return $connected;
 413         }
 414
 415         function __destruct() {
 416                 if ($this->db) {
 417                         switch ($this->driver) {
 418                                 case 'pdo':
 419                                         $this->db = null;
 420                                         break;
 421                                 case 'mysqli':
 422                                         $this->db->close();
 423                                         break;
 424                                 case 'mysql':
 425                                         mysql_close($this->db);
 426                                         break;
 427                         }
 428                 }
 429         }
 430
 431         /**
 432          * @brief Replaces ANY_VALUE() function by MIN() function,
 433          *  if the database server does not support ANY_VALUE().
 434          *
 435          * Considerations for Standard SQL, or MySQL with ONLY_FULL_GROUP_BY (default since 5.7.5).
 436          * ANY_VALUE() is available from MySQL 5.7.5 https://dev.mysql.com/doc/refman/5.7/en/miscellaneous-functions.html
 437          * A standard fall-back is to use MIN().
 438          *
 439          * @param string $sql An SQL string without the values
 440          * @return string The input SQL string modified if necessary.
 441          */
 442         public function any_value_fallback($sql) {
 443                 $server_info = $this->server_info();
 444                 if (version_compare($server_info, '5.7.5', '<') ||
 445                         (stripos($server_info, 'MariaDB') !== false)) {
 446                         $sql = str_ireplace('ANY_VALUE(', 'MIN(', $sql);
 447                 }
 448                 return $sql;
 449         }
 450
 451         /**
 452          * @brief beautifies the query - useful for "SHOW PROCESSLIST"
 453          *
 454          * This is safe when we bind the parameters later.
 455          * The parameter values aren't part of the SQL.
 456          *
 457          * @param string $sql An SQL string without the values
 458          * @return string The input SQL string modified if necessary.
 459          */
 460         public function clean_query($sql) {
 461                 $search = array("\t", "\n", "\r", "  ");
 462                 $replace = array(' ', ' ', ' ', ' ');
 463                 do {
 464                         $oldsql = $sql;
 465                         $sql = str_replace($search, $replace, $sql);
 466                 } while ($oldsql != $sql);
 467
 468                 return $sql;
 469         }
 470
 471
 472         /**
 473          * @brief Replaces the ? placeholders with the parameters in the $args array
 474          *
 475          * @param string $sql SQL query
 476          * @param array $args The parameters that are to replace the ? placeholders
 477          * @return string The replaced SQL query
 478          */
 479         static private function replace_parameters($sql, $args) {
 480                 $offset = 0;
 481                 foreach ($args AS $param => $value) {
 482                         if (is_int($args[$param]) || is_float($args[$param])) {
 483                                 $replace = intval($args[$param]);
 484                         } else {
 485                                 $replace = "'".self::$dbo->escape($args[$param])."'";
 486                         }
 487
 488                         $pos = strpos($sql, '?', $offset);
 489                         if ($pos !== false) {
 490                                 $sql = substr_replace($sql, $replace, $pos, 1);
 491                         }
 492                         $offset = $pos + strlen($replace);
 493                 }
 494                 return $sql;
 495         }
 496
 497         /**
 498          * @brief Convert parameter array to an universal form
 499          * @param array $args Parameter array
 500          * @return array universalized parameter array
 501          */
 502         private static function getParam($args) {
 503                 unset($args[0]);
 504
 505                 // When the second function parameter is an array then use this as the parameter array
 506                 if ((count($args) > 0) && (is_array($args[1]))) {
 507                         return $args[1];
 508                 } else {
 509                         return $args;
 510                 }
 511         }
 512
 513         /**
 514          * @brief Executes a prepared statement that returns data
 515          * @usage Example: $r = p("SELECT * FROM `item` WHERE `guid` = ?", $guid);
 516          * @param string $sql SQL statement
 517          * @return object statement object
 518          */
 519         static public function p($sql) {
 520                 $a = get_app();
 521
 522                 $stamp1 = microtime(true);
 523
 524                 $params = self::getParam(func_get_args());
 525
 526                 // Renumber the array keys to be sure that they fit
 527                 $i = 0;
 528                 $args = array();
 529                 foreach ($params AS $param) {
 530                         $args[++$i] = $param;
 531                 }
 532
 533                 if (!self::$dbo || !self::$dbo->connected) {
 534                         return false;
 535                 }
 536
 537                 if (substr_count($sql, '?') != count($args)) {
 538                         // Question: Should we continue or stop the query here?
 539                         logger('Parameter mismatch. Query "'.$sql.'" - Parameters '.print_r($args, true), LOGGER_DEBUG);
 540                 }
 541
 542                 $sql = self::$dbo->clean_query($sql);
 543                 $sql = self::$dbo->any_value_fallback($sql);
 544
 545                 $orig_sql = $sql;
 546
 547                 if (x($a->config,'system') && x($a->config['system'], 'db_callstack')) {
 548                         $sql = "/*".$a->callstack()." */ ".$sql;
 549                 }
 550
 551                 self::$dbo->error = '';
 552                 self::$dbo->errorno = 0;
 553                 self::$dbo->affected_rows = 0;
 554
 555                 // We have to make some things different if this function is called from "e"
 556                 $trace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 2);
 557
 558                 if (isset($trace[1])) {
 559                         $called_from = $trace[1];
 560                 } else {
 561                         // We use just something that is defined to avoid warnings
 562                         $called_from = $trace[0];
 563                 }
 564                 // We are having an own error logging in the function "e"
 565                 $called_from_e = ($called_from['function'] == 'e');
 566
 567                 switch (self::$dbo->driver) {
 568                         case 'pdo':
 569                                 if (!$stmt = self::$dbo->db->prepare($sql)) {
 570                                         $errorInfo = self::$dbo->db->errorInfo();
 571                                         self::$dbo->error = $errorInfo[2];
 572                                         self::$dbo->errorno = $errorInfo[1];
 573                                         $retval = false;
 574                                         break;
 575                                 }
 576
 577                                 foreach ($args AS $param => $value) {
 578                                         $stmt->bindParam($param, $args[$param]);
 579                                 }
 580
 581                                 if (!$stmt->execute()) {
 582                                         $errorInfo = $stmt->errorInfo();
 583                                         self::$dbo->error = $errorInfo[2];
 584                                         self::$dbo->errorno = $errorInfo[1];
 585                                         $retval = false;
 586                                 } else {
 587                                         $retval = $stmt;
 588                                         self::$dbo->affected_rows = $retval->rowCount();
 589                                 }
 590                                 break;
 591                         case 'mysqli':
 592                                 // There are SQL statements that cannot be executed with a prepared statement
 593                                 $parts = explode(' ', $orig_sql);
 594                                 $command = strtolower($parts[0]);
 595                                 $can_be_prepared = in_array($command, array('select', 'update', 'insert', 'delete'));
 596
 597                                 // The fallback routine currently only works with statements that doesn't return values
 598                                 if (!$can_be_prepared && $called_from_e) {
 599                                         $retval = self::$dbo->db->query(self::replace_parameters($sql, $args));
 600                                         if (self::$dbo->db->errno) {
 601                                                 self::$dbo->error = self::$dbo->db->error;
 602                                                 self::$dbo->errorno = self::$dbo->db->errno;
 603                                                 $retval = false;
 604                                         } else {
 605                                                 if (isset($retval->num_rows)) {
 606                                                         self::$dbo->affected_rows = $retval->num_rows;
 607                                                 } else {
 608                                                         self::$dbo->affected_rows = self::$dbo->db->affected_rows;
 609                                                 }
 610                                         }
 611                                         break;
 612                                 }
 613
 614                                 $stmt = self::$dbo->db->stmt_init();
 615
 616                                 if (!$stmt->prepare($sql)) {
 617                                         self::$dbo->error = $stmt->error;
 618                                         self::$dbo->errorno = $stmt->errno;
 619                                         $retval = false;
 620                                         break;
 621                                 }
 622
 623                                 $params = '';
 624                                 $values = array();
 625                                 foreach ($args AS $param => $value) {
 626                                         if (is_int($args[$param])) {
 627                                                 $params .= 'i';
 628                                         } elseif (is_float($args[$param])) {
 629                                                 $params .= 'd';
 630                                         } elseif (is_string($args[$param])) {
 631                                                 $params .= 's';
 632                                         } else {
 633                                                 $params .= 'b';
 634                                         }
 635                                         $values[] = &$args[$param];
 636                                 }
 637
 638                                 if (count($values) > 0) {
 639                                         array_unshift($values, $params);
 640                                         call_user_func_array(array($stmt, 'bind_param'), $values);
 641                                 }
 642
 643                                 if (!$stmt->execute()) {
 644                                         self::$dbo->error = self::$dbo->db->error;
 645                                         self::$dbo->errorno = self::$dbo->db->errno;
 646                                         $retval = false;
 647                                 } else {
 648                                         $stmt->store_result();
 649                                         $retval = $stmt;
 650                                         self::$dbo->affected_rows = $retval->affected_rows;
 651                                 }
 652                                 break;
 653                         case 'mysql':
 654                                 // For the old "mysql" functions we cannot use prepared statements
 655                                 $retval = mysql_query(self::replace_parameters($sql, $args), self::$dbo->db);
 656                                 if (mysql_errno(self::$dbo->db)) {
 657                                         self::$dbo->error = mysql_error(self::$dbo->db);
 658                                         self::$dbo->errorno = mysql_errno(self::$dbo->db);
 659                                 } else {
 660                                         self::$dbo->affected_rows = mysql_affected_rows($retval);
 661
 662                                         // Due to missing mysql_* support this here wasn't tested at all
 663                                         // See here: http://php.net/manual/en/function.mysql-num-rows.php
 664                                         if (self::$dbo->affected_rows <= 0) {
 665                                                 self::$dbo->affected_rows = mysql_num_rows($retval);
 666                                         }
 667                                 }
 668                                 break;
 669                 }
 670
 671                 // We are having an own error logging in the function "e"
 672                 if ((self::$dbo->errorno != 0) && !$called_from_e) {
 673                         // We have to preserve the error code, somewhere in the logging it get lost
 674                         $error = self::$dbo->error;
 675                         $errorno = self::$dbo->errorno;
 676
 677                         logger('DB Error '.self::$dbo->errorno.': '.self::$dbo->error."\n".
 678                                 $a->callstack(8)."\n".self::replace_parameters($sql, $params));
 679
 680                         self::$dbo->error = $error;
 681                         self::$dbo->errorno = $errorno;
 682                 }
 683
 684                 $a->save_timestamp($stamp1, 'database');
 685
 686                 if (x($a->config,'system') && x($a->config['system'], 'db_log')) {
 687
 688                         $stamp2 = microtime(true);
 689                         $duration = (float)($stamp2 - $stamp1);
 690
 691                         if (($duration > $a->config["system"]["db_loglimit"])) {
 692                                 $duration = round($duration, 3);
 693                                 $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
 694
 695                                 @file_put_contents($a->config["system"]["db_log"], datetime_convert()."\t".$duration."\t".
 696                                                 basename($backtrace[1]["file"])."\t".
 697                                                 $backtrace[1]["line"]."\t".$backtrace[2]["function"]."\t".
 698                                                 substr(self::replace_parameters($sql, $args), 0, 2000)."\n", FILE_APPEND);
 699                         }
 700                 }
 701                 return $retval;
 702         }
 703
 704         /**
 705          * @brief Executes a prepared statement like UPDATE or INSERT that doesn't return data
 706          *
 707          * @param string $sql SQL statement
 708          * @return boolean Was the query successfull? False is returned only if an error occurred
 709          */
 710         static public function e($sql) {
 711                 $a = get_app();
 712
 713                 $stamp = microtime(true);
 714
 715                 $params = self::getParam(func_get_args());
 716
 717                 // In a case of a deadlock we are repeating the query 20 times
 718                 $timeout = 20;
 719
 720                 do {
 721                         $stmt = self::p($sql, $params);
 722
 723                         if (is_bool($stmt)) {
 724                                 $retval = $stmt;
 725                         } elseif (is_object($stmt)) {
 726                                 $retval = true;
 727                         } else {
 728                                 $retval = false;
 729                         }
 730
 731                         self::close($stmt);
 732
 733                 } while ((self::$dbo->errorno == 1213) && (--$timeout > 0));
 734
 735                 if (self::$dbo->errorno != 0) {
 736                         // We have to preserve the error code, somewhere in the logging it get lost
 737                         $error = self::$dbo->error;
 738                         $errorno = self::$dbo->errorno;
 739
 740                         logger('DB Error '.self::$dbo->errorno.': '.self::$dbo->error."\n".
 741                                 $a->callstack(8)."\n".self::replace_parameters($sql, $params));
 742
 743                         self::$dbo->error = $error;
 744                         self::$dbo->errorno = $errorno;
 745                 }
 746
 747                 $a->save_timestamp($stamp, "database_write");
 748
 749                 return $retval;
 750         }
 751
 752         /**
 753          * @brief Check if data exists
 754          *
 755          * @param string $table Table name
 756          * @param array $condition array of fields for condition
 757          *
 758          * @return boolean Are there rows for that condition?
 759          */
 760         static public function exists($table, $condition) {
 761                 if (empty($table)) {
 762                         return false;
 763                 }
 764
 765                 $fields = array();
 766
 767                 $array_element = each($condition);
 768                 $array_key = $array_element['key'];
 769                 if (!is_int($array_key)) {
 770                         $fields = array($array_key);
 771                 }
 772
 773                 $stmt = self::select($table, $fields, $condition, array('limit' => 1, 'only_query' => true));
 774
 775                 if (is_bool($stmt)) {
 776                         $retval = $stmt;
 777                 } else {
 778                         $retval = (self::num_rows($stmt) > 0);
 779                 }
 780
 781                 self::close($stmt);
 782
 783                 return $retval;
 784         }
 785
 786         /**
 787          * @brief Fetches the first row
 788          *
 789          * @param string $sql SQL statement
 790          * @return array first row of query
 791          */
 792         static public function fetch_first($sql) {
 793                 $params = self::getParam(func_get_args());
 794
 795                 $stmt = self::p($sql, $params);
 796
 797                 if (is_bool($stmt)) {
 798                         $retval = $stmt;
 799                 } else {
 800                         $retval = self::fetch($stmt);
 801                 }
 802
 803                 self::close($stmt);
 804
 805                 return $retval;
 806         }
 807
 808         /**
 809          * @brief Returns the number of affected rows of the last statement
 810          *
 811          * @return int Number of rows
 812          */
 813         static public function affected_rows() {
 814                 return self::$dbo->affected_rows;
 815         }
 816
 817         /**
 818          * @brief Returns the number of rows of a statement
 819          *
 820          * @param object Statement object
 821          * @return int Number of rows
 822          */
 823         static public function num_rows($stmt) {
 824                 if (!is_object($stmt)) {
 825                         return 0;
 826                 }
 827                 switch (self::$dbo->driver) {
 828                         case 'pdo':
 829                                 return $stmt->rowCount();
 830                         case 'mysqli':
 831                                 return $stmt->num_rows;
 832                         case 'mysql':
 833                                 return mysql_num_rows($stmt);
 834                 }
 835                 return 0;
 836         }
 837
 838         /**
 839          * @brief Fetch a single row
 840          *
 841          * @param object $stmt statement object
 842          * @return array current row
 843          */
 844         static public function fetch($stmt) {
 845                 if (!is_object($stmt)) {
 846                         return false;
 847                 }
 848
 849                 switch (self::$dbo->driver) {
 850                         case 'pdo':
 851                                 return $stmt->fetch(PDO::FETCH_ASSOC);
 852                         case 'mysqli':
 853                                 // This code works, but is slow
 854
 855                                 // Bind the result to a result array
 856                                 $cols = array();
 857
 858                                 $cols_num = array();
 859                                 for ($x = 0; $x < $stmt->field_count; $x++) {
 860                                         $cols[] = &$cols_num[$x];
 861                                 }
 862
 863                                 call_user_func_array(array($stmt, 'bind_result'), $cols);
 864
 865                                 if (!$stmt->fetch()) {
 866                                         return false;
 867                                 }
 868
 869                                 // The slow part:
 870                                 // We need to get the field names for the array keys
 871                                 // It seems that there is no better way to do this.
 872                                 $result = $stmt->result_metadata();
 873                                 $fields = $result->fetch_fields();
 874
 875                                 $columns = array();
 876                                 foreach ($cols_num AS $param => $col) {
 877                                         $columns[$fields[$param]->name] = $col;
 878                                 }
 879                                 return $columns;
 880                         case 'mysql':
 881                                 return mysql_fetch_array(self::$dbo->result, MYSQL_ASSOC);
 882                 }
 883         }
 884
 885         /**
 886          * @brief Insert a row into a table
 887          *
 888          * @param string $table Table name
 889          * @param array $param parameter array
 890          * @param bool $on_duplicate_update Do an update on a duplicate entry
 891          *
 892          * @return boolean was the insert successfull?
 893          */
 894         static public function insert($table, $param, $on_duplicate_update = false) {
 895                 $sql = "INSERT INTO `".self::$dbo->escape($table)."` (`".implode("`, `", array_keys($param))."`) VALUES (".
 896                         substr(str_repeat("?, ", count($param)), 0, -2).")";
 897
 898                 if ($on_duplicate_update) {
 899                         $sql .= " ON DUPLICATE KEY UPDATE `".implode("` = ?, `", array_keys($param))."` = ?";
 900
 901                         $values = array_values($param);
 902                         $param = array_merge_recursive($values, $values);
 903                 }
 904
 905                 return self::e($sql, $param);
 906         }
 907
 908         /**
 909          * @brief Fetch the id of the last insert command
 910          *
 911          * @return integer Last inserted id
 912          */
 913         function lastInsertId() {
 914                 switch (self::$dbo->driver) {
 915                         case 'pdo':
 916                                 $id = self::$dbo->db->lastInsertId();
 917                                 break;
 918                         case 'mysqli':
 919                                 $id = self::$dbo->db->insert_id;
 920                                 break;
 921                         case 'mysql':
 922                                 $id = mysql_insert_id(self::$dbo);
 923                                 break;
 924                 }
 925                 return $id;
 926         }
 927
 928         /**
 929          * @brief Locks a table for exclusive write access
 930          *
 931          * This function can be extended in the future to accept a table array as well.
 932          *
 933          * @param string $table Table name
 934          *
 935          * @return boolean was the lock successful?
 936          */
 937         static public function lock($table) {
 938                 // See here: https://dev.mysql.com/doc/refman/5.7/en/lock-tables-and-transactions.html
 939                 self::e("SET autocommit=0");
 940                 $success = self::e("LOCK TABLES `".self::$dbo->escape($table)."` WRITE");
 941                 if (!$success) {
 942                         self::e("SET autocommit=1");
 943                 } else {
 944                         self::$in_transaction = true;
 945                 }
 946                 return $success;
 947         }
 948
 949         /**
 950          * @brief Unlocks all locked tables
 951          *
 952          * @return boolean was the unlock successful?
 953          */
 954         static public function unlock() {
 955                 // See here: https://dev.mysql.com/doc/refman/5.7/en/lock-tables-and-transactions.html
 956                 self::e("COMMIT");
 957                 $success = self::e("UNLOCK TABLES");
 958                 self::e("SET autocommit=1");
 959                 self::$in_transaction = false;
 960                 return $success;
 961         }
 962
 963         /**
 964          * @brief Starts a transaction
 965          *
 966          * @return boolean Was the command executed successfully?
 967          */
 968         static public function transaction() {
 969                 if (!self::e('COMMIT')) {
 970                         return false;
 971                 }
 972                 if (!self::e('START TRANSACTION')) {
 973                         return false;
 974                 }
 975                 self::$in_transaction = true;
 976                 return true;
 977         }
 978
 979         /**
 980          * @brief Does a commit
 981          *
 982          * @return boolean Was the command executed successfully?
 983          */
 984         static public function commit() {
 985                 if (!self::e('COMMIT')) {
 986                         return false;
 987                 }
 988                 self::$in_transaction = false;
 989                 return true;
 990         }
 991
 992         /**
 993          * @brief Does a rollback
 994          *
 995          * @return boolean Was the command executed successfully?
 996          */
 997         static public function rollback() {
 998                 if (!self::e('ROLLBACK')) {
 999                         return false;
1000                 }
1001                 self::$in_transaction = false;
1002                 return true;
1003         }
1004
1005         /**
1006          * @brief Build the array with the table relations
1007          *
1008          * The array is build from the database definitions in dbstructure.php
1009          *
1010          * This process must only be started once, since the value is cached.
1011          */
1012         static private function build_relation_data() {
1013                 $definition = db_definition();
1014
1015                 foreach ($definition AS $table => $structure) {
1016                         foreach ($structure['fields'] AS $field => $field_struct) {
1017                                 if (isset($field_struct['relation'])) {
1018                                         foreach ($field_struct['relation'] AS $rel_table => $rel_field) {
1019                                                 self::$relation[$rel_table][$rel_field][$table][] = $field;
1020                                         }
1021                                 }
1022                         }
1023                 }
1024         }
1025
1026         /**
1027          * @brief Delete a row from a table
1028          *
1029          * @param string $table Table name
1030          * @param array $param parameter array
1031          * @param boolean $in_process Internal use: Only do a commit after the last delete
1032          * @param array $callstack Internal use: prevent endless loops
1033          *
1034          * @return boolean|array was the delete successfull? When $in_process is set: deletion data
1035          */
1036         static public function delete($table, $param, $in_process = false, &$callstack = array()) {
1037
1038                 $commands = array();
1039
1040                 // Create a key for the loop prevention
1041                 $key = $table.':'.implode(':', array_keys($param)).':'.implode(':', $param);
1042
1043                 // We quit when this key already exists in the callstack.
1044                 if (isset($callstack[$key])) {
1045                         return $commands;
1046                 }
1047
1048                 $callstack[$key] = true;
1049
1050                 $table = self::$dbo->escape($table);
1051
1052                 $commands[$key] = array('table' => $table, 'param' => $param);
1053
1054                 // To speed up the whole process we cache the table relations
1055                 if (count(self::$relation) == 0) {
1056                         self::build_relation_data();
1057                 }
1058
1059                 // Is there a relation entry for the table?
1060                 if (isset(self::$relation[$table])) {
1061                         // We only allow a simple "one field" relation.
1062                         $field = array_keys(self::$relation[$table])[0];
1063                         $rel_def = array_values(self::$relation[$table])[0];
1064
1065                         // Create a key for preventing double queries
1066                         $qkey = $field.'-'.$table.':'.implode(':', array_keys($param)).':'.implode(':', $param);
1067
1068                         // When the search field is the relation field, we don't need to fetch the rows
1069                         // This is useful when the leading record is already deleted in the frontend but the rest is done in the backend
1070                         if ((count($param) == 1) && ($field == array_keys($param)[0])) {
1071                                 foreach ($rel_def AS $rel_table => $rel_fields) {
1072                                         foreach ($rel_fields AS $rel_field) {
1073                                                 $retval = self::delete($rel_table, array($rel_field => array_values($param)[0]), true, $callstack);
1074                                                 $commands = array_merge($commands, $retval);
1075                                         }
1076                                 }
1077                         // We quit when this key already exists in the callstack.
1078                         } elseif (!isset($callstack[$qkey])) {
1079
1080                                 $callstack[$qkey] = true;
1081
1082                                 // Fetch all rows that are to be deleted
1083                                 $data = self::select($table, array($field), $param);
1084
1085                                 while ($row = self::fetch($data)) {
1086                                         // Now we accumulate the delete commands
1087                                         $retval = self::delete($table, array($field => $row[$field]), true, $callstack);
1088                                         $commands = array_merge($commands, $retval);
1089                                 }
1090
1091                                 self::close($data);
1092
1093                                 // Since we had split the delete command we don't need the original command anymore
1094                                 unset($commands[$key]);
1095                         }
1096                 }
1097
1098                 if (!$in_process) {
1099                         // Now we finalize the process
1100                         $do_transaction = !self::$in_transaction;
1101
1102                         if ($do_transaction) {
1103                                 self::transaction();
1104                         }
1105
1106                         $compacted = array();
1107                         $counter = array();
1108
1109                         foreach ($commands AS $command) {
1110                                 $condition = $command['param'];
1111                                 $array_element = each($condition);
1112                                 $array_key = $array_element['key'];
1113                                 if (is_int($array_key)) {
1114                                         $condition_string = " WHERE ".array_shift($condition);
1115                                 } else {
1116                                         $condition_string = " WHERE `".implode("` = ? AND `", array_keys($condition))."` = ?";
1117                                 }
1118
1119                                 if ((count($command['param']) > 1) || is_int($array_key)) {
1120                                         $sql = "DELETE FROM `".$command['table']."`".$condition_string;
1121                                         logger(self::replace_parameters($sql, $condition), LOGGER_DATA);
1122
1123                                         if (!self::e($sql, $condition)) {
1124                                                 if ($do_transaction) {
1125                                                         self::rollback();
1126                                                 }
1127                                                 return false;
1128                                         }
1129                                 } else {
1130                                         $key_table = $command['table'];
1131                                         $key_param = array_keys($command['param'])[0];
1132                                         $value = array_values($command['param'])[0];
1133
1134                                         // Split the SQL queries in chunks of 100 values
1135                                         // We do the $i stuff here to make the code better readable
1136                                         $i = $counter[$key_table][$key_param];
1137                                         if (count($compacted[$key_table][$key_param][$i]) > 100) {
1138                                                 ++$i;
1139                                         }
1140
1141                                         $compacted[$key_table][$key_param][$i][$value] = $value;
1142                                         $counter[$key_table][$key_param] = $i;
1143                                 }
1144                         }
1145                         foreach ($compacted AS $table => $values) {
1146                                 foreach ($values AS $field => $field_value_list) {
1147                                         foreach ($field_value_list AS $field_values) {
1148                                                 $sql = "DELETE FROM `".$table."` WHERE `".$field."` IN (".
1149                                                         substr(str_repeat("?, ", count($field_values)), 0, -2).");";
1150
1151                                                 logger(self::replace_parameters($sql, $field_values), LOGGER_DATA);
1152
1153                                                 if (!self::e($sql, $field_values)) {
1154                                                         if ($do_transaction) {
1155                                                                 self::rollback();
1156                                                         }
1157                                                         return false;
1158                                                 }
1159                                         }
1160                                 }
1161                         }
1162                         if ($do_transaction) {
1163                                 self::commit();
1164                         }
1165                         return true;
1166                 }
1167
1168                 return $commands;
1169         }
1170
1171         /**
1172          * @brief Updates rows
1173          *
1174          * Updates rows in the database. When $old_fields is set to an array,
1175          * the system will only do an update if the fields in that array changed.
1176          *
1177          * Attention:
1178          * Only the values in $old_fields are compared.
1179          * This is an intentional behaviour.
1180          *
1181          * Example:
1182          * We include the timestamp field in $fields but not in $old_fields.
1183          * Then the row will only get the new timestamp when the other fields had changed.
1184          *
1185          * When $old_fields is set to a boolean value the system will do this compare itself.
1186          * When $old_fields is set to "true" the system will do an insert if the row doesn't exists.
1187          *
1188          * Attention:
1189          * Only set $old_fields to a boolean value when you are sure that you will update a single row.
1190          * When you set $old_fields to "true" then $fields must contain all relevant fields!
1191          *
1192          * @param string $table Table name
1193          * @param array $fields contains the fields that are updated
1194          * @param array $condition condition array with the key values
1195          * @param array|boolean $old_fields array with the old field values that are about to be replaced (true = update on duplicate)
1196          *
1197          * @return boolean was the update successfull?
1198          */
1199         static public function update($table, $fields, $condition, $old_fields = array()) {
1200
1201                 $table = self::$dbo->escape($table);
1202
1203                 if (count($condition) > 0) {
1204                         $array_element = each($condition);
1205                         $array_key = $array_element['key'];
1206                         if (is_int($array_key)) {
1207                                 $condition_string = " WHERE ".array_shift($condition);
1208                         } else {
1209                                 $condition_string = " WHERE `".implode("` = ? AND `", array_keys($condition))."` = ?";
1210                         }
1211                 } else {
1212                         $condition_string = "";
1213                 }
1214
1215                 if (is_bool($old_fields)) {
1216                         $do_insert = $old_fields;
1217
1218                         $old_fields = self::select($table, array(), $condition, array('limit' => 1));
1219
1220                         if (is_bool($old_fields)) {
1221                                 if ($do_insert) {
1222                                         $values = array_merge($condition, $fields);
1223                                         return self::insert($table, $values, $do_insert);
1224                                 }
1225                                 $old_fields = array();
1226                         }
1227                 }
1228
1229                 $do_update = (count($old_fields) == 0);
1230
1231                 foreach ($old_fields AS $fieldname => $content) {
1232                         if (isset($fields[$fieldname])) {
1233                                 if ($fields[$fieldname] == $content) {
1234                                         unset($fields[$fieldname]);
1235                                 } else {
1236                                         $do_update = true;
1237                                 }
1238                         }
1239                 }
1240
1241                 if (!$do_update || (count($fields) == 0)) {
1242                         return true;
1243                 }
1244
1245                 $sql = "UPDATE `".$table."` SET `".
1246                         implode("` = ?, `", array_keys($fields))."` = ?".$condition_string;
1247
1248                 $params1 = array_values($fields);
1249                 $params2 = array_values($condition);
1250                 $params = array_merge_recursive($params1, $params2);
1251
1252                 return self::e($sql, $params);
1253         }
1254
1255         /**
1256          * @brief Select rows from a table
1257          *
1258          * @param string $table Table name
1259          * @param array $fields array of selected fields
1260          * @param array $condition array of fields for condition
1261          * @param array $params array of several parameters
1262          *
1263          * @return boolean|object If "limit" is equal "1" only a single row is returned, else a query object is returned
1264          *
1265          * Example:
1266          * $table = "item";
1267          * $fields = array("id", "uri", "uid", "network");
1268          * $condition = array("uid" => 1, "network" => 'dspr');
1269          * $params = array("order" => array("id", "received" => true), "limit" => 1);
1270          *
1271          * $data = dba::select($table, $fields, $condition, $params);
1272          */
1273         static public function select($table, $fields = array(), $condition = array(), $params = array()) {
1274                 if ($table == '') {
1275                         return false;
1276                 }
1277
1278                 if (count($fields) > 0) {
1279                         $select_fields = "`".implode("`, `", array_values($fields))."`";
1280                 } else {
1281                         $select_fields = "*";
1282                 }
1283
1284                 if (count($condition) > 0) {
1285                         $array_element = each($condition);
1286                         $array_key = $array_element['key'];
1287                         if (is_int($array_key)) {
1288                                 $condition_string = " WHERE ".array_shift($condition);
1289                         } else {
1290                                 $condition_string = " WHERE `".implode("` = ? AND `", array_keys($condition))."` = ?";
1291                         }
1292                 } else {
1293                         $condition_string = "";
1294                 }
1295
1296                 $param_string = '';
1297                 $single_row = false;
1298
1299                 if (isset($params['order'])) {
1300                         $param_string .= " ORDER BY ";
1301                         foreach ($params['order'] AS $fields => $order) {
1302                                 if (!is_int($fields)) {
1303                                         $param_string .= "`".$fields."` ".($order ? "DESC" : "ASC").", ";
1304                                 } else {
1305                                         $param_string .= "`".$order."`, ";
1306                                 }
1307                         }
1308                         $param_string = substr($param_string, 0, -2);
1309                 }
1310
1311                 if (isset($params['limit']) && is_int($params['limit'])) {
1312                         $param_string .= " LIMIT ".$params['limit'];
1313                         $single_row = ($params['limit'] == 1);
1314                 }
1315
1316                 if (isset($params['only_query']) && $params['only_query']) {
1317                         $single_row = !$params['only_query'];
1318                 }
1319
1320                 $sql = "SELECT ".$select_fields." FROM `".$table."`".$condition_string.$param_string;
1321
1322                 $result = self::p($sql, $condition);
1323
1324                 if (is_bool($result) || !$single_row) {
1325                         return $result;
1326                 } else {
1327                         $row = self::fetch($result);
1328                         self::close($result);
1329                         return $row;
1330                 }
1331         }
1332
1333
1334         /**
1335          * @brief Fills an array with data from a query
1336          *
1337          * @param object $stmt statement object
1338          * @return array Data array
1339          */
1340         static public function inArray($stmt, $do_close = true) {
1341                 if (is_bool($stmt)) {
1342                         return $stmt;
1343                 }
1344
1345                 $data = array();
1346                 while ($row = self::fetch($stmt)) {
1347                         $data[] = $row;
1348                 }
1349                 if ($do_close) {
1350                         self::close($stmt);
1351                 }
1352                 return $data;
1353         }
1354
1355         /**
1356          * @brief Closes the current statement
1357          *
1358          * @param object $stmt statement object
1359          * @return boolean was the close successfull?
1360          */
1361         static public function close($stmt) {
1362                 if (!is_object($stmt)) {
1363                         return false;
1364                 }
1365
1366                 switch (self::$dbo->driver) {
1367                         case 'pdo':
1368                                 return $stmt->closeCursor();
1369                         case 'mysqli':
1370                                 return $stmt->free_result();
1371                                 return $stmt->close();
1372                         case 'mysql':
1373                                 return mysql_free_result($stmt);
1374                 }
1375         }
1376 }
1377
1378 function printable($s) {
1379         $s = preg_replace("~([\x01-\x08\x0E-\x0F\x10-\x1F\x7F-\xFF])~",".", $s);
1380         $s = str_replace("\x00",'.',$s);
1381         if (x($_SERVER,'SERVER_NAME')) {
1382                 $s = escape_tags($s);
1383         }
1384         return $s;
1385 }
1386
1387 // Procedural functions
1388 function dbg($state) {
1389         global $db;
1390
1391         if ($db) {
1392                 $db->dbg($state);
1393         }
1394 }
1395
1396 function dbesc($str) {
1397         global $db;
1398
1399         if ($db && $db->connected) {
1400                 return($db->escape($str));
1401         } else {
1402                 return(str_replace("'","\\'",$str));
1403         }
1404 }
1405
1406 // Function: q($sql,$args);
1407 // Description: execute SQL query with printf style args.
1408 // Example: $r = q("SELECT * FROM `%s` WHERE `uid` = %d",
1409 //                   'user', 1);
1410 function q($sql) {
1411         global $db;
1412         $args = func_get_args();
1413         unset($args[0]);
1414
1415         if ($db && $db->connected) {
1416                 $sql = $db->clean_query($sql);
1417                 $sql = $db->any_value_fallback($sql);
1418                 $stmt = @vsprintf($sql,$args); // Disabled warnings
1419                 //logger("dba: q: $stmt", LOGGER_ALL);
1420                 if ($stmt === false)
1421                         logger('dba: vsprintf error: ' . print_r(debug_backtrace(),true), LOGGER_DEBUG);
1422
1423                 $db->log_index($stmt);
1424
1425                 return $db->q($stmt);
1426         }
1427
1428         /**
1429          *
1430          * This will happen occasionally trying to store the
1431          * session data after abnormal program termination
1432          *
1433          */
1434         logger('dba: no database: ' . print_r($args,true));
1435         return false;
1436 }
1437
1438 /**
1439  * @brief Performs a query with "dirty reads"
1440  *
1441  * By doing dirty reads (reading uncommitted data) no locks are performed
1442  * This function can be used to fetch data that doesn't need to be reliable.
1443  *
1444  * @param $args Query parameters (1 to N parameters of different types)
1445  * @return array Query array
1446  */
1447 function qu($sql) {
1448         global $db;
1449
1450         $args = func_get_args();
1451         unset($args[0]);
1452
1453         if ($db && $db->connected) {
1454                 $sql = $db->clean_query($sql);
1455                 $sql = $db->any_value_fallback($sql);
1456                 $stmt = @vsprintf($sql,$args); // Disabled warnings
1457                 if ($stmt === false)
1458                         logger('dba: vsprintf error: ' . print_r(debug_backtrace(),true), LOGGER_DEBUG);
1459
1460                 $db->log_index($stmt);
1461
1462                 $db->q("SET SESSION TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;");
1463                 $retval = $db->q($stmt);
1464                 $db->q("SET SESSION TRANSACTION ISOLATION LEVEL REPEATABLE READ;");
1465                 return $retval;
1466         }
1467
1468         /**
1469          *
1470          * This will happen occasionally trying to store the
1471          * session data after abnormal program termination
1472          *
1473          */
1474         logger('dba: no database: ' . print_r($args,true));
1475         return false;
1476 }
1477
1478 /**
1479  *
1480  * Raw db query, no arguments
1481  *
1482  */
1483 function dbq($sql) {
1484         global $db;
1485
1486         if ($db && $db->connected) {
1487                 $ret = $db->q($sql);
1488         } else {
1489                 $ret = false;
1490         }
1491         return $ret;
1492 }
1493
1494 // Caller is responsible for ensuring that any integer arguments to
1495 // dbesc_array are actually integers and not malformed strings containing
1496 // SQL injection vectors. All integer array elements should be specifically
1497 // cast to int to avoid trouble.
1498 function dbesc_array_cb(&$item, $key) {
1499         if (is_string($item))
1500                 $item = dbesc($item);
1501 }
1502
1503 function dbesc_array(&$arr) {
1504         if (is_array($arr) && count($arr)) {
1505                 array_walk($arr,'dbesc_array_cb');
1506         }
1507 }
1508
1509 function dba_timer() {
1510         return microtime(true);
1511 }