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 $connected;
 413         }
 414
 415         function insert_id() {
 416                 switch ($this->driver) {
 417                         case 'pdo':
 418                                 $id = $this->db->lastInsertId();
 419                                 break;
 420                         case 'mysqli':
 421                                 $id = $this->db->insert_id;
 422                                 break;
 423                         case 'mysql':
 424                                 $id = mysql_insert_id($this->db);
 425                                 break;
 426                 }
 427                 return $id;
 428         }
 429
 430         function __destruct() {
 431                 if ($this->db) {
 432                         switch ($this->driver) {
 433                                 case 'pdo':
 434                                         $this->db = null;
 435                                         break;
 436                                 case 'mysqli':
 437                                         $this->db->close();
 438                                         break;
 439                                 case 'mysql':
 440                                         mysql_close($this->db);
 441                                         break;
 442                         }
 443                 }
 444         }
 445
 446         /**
 447          * @brief Replaces ANY_VALUE() function by MIN() function,
 448          *  if the database server does not support ANY_VALUE().
 449          *
 450          * Considerations for Standard SQL, or MySQL with ONLY_FULL_GROUP_BY (default since 5.7.5).
 451          * ANY_VALUE() is available from MySQL 5.7.5 https://dev.mysql.com/doc/refman/5.7/en/miscellaneous-functions.html
 452          * A standard fall-back is to use MIN().
 453          *
 454          * @param string $sql An SQL string without the values
 455          * @return string The input SQL string modified if necessary.
 456          */
 457         public function any_value_fallback($sql) {
 458                 $server_info = $this->server_info();
 459                 if (version_compare($server_info, '5.7.5', '<') ||
 460                         (stripos($server_info, 'MariaDB') !== false)) {
 461                         $sql = str_ireplace('ANY_VALUE(', 'MIN(', $sql);
 462                 }
 463                 return $sql;
 464         }
 465
 466         /**
 467          * @brief beautifies the query - useful for "SHOW PROCESSLIST"
 468          *
 469          * This is safe when we bind the parameters later.
 470          * The parameter values aren't part of the SQL.
 471          *
 472          * @param string $sql An SQL string without the values
 473          * @return string The input SQL string modified if necessary.
 474          */
 475         public function clean_query($sql) {
 476                 $search = array("\t", "\n", "\r", "  ");
 477                 $replace = array(' ', ' ', ' ', ' ');
 478                 do {
 479                         $oldsql = $sql;
 480                         $sql = str_replace($search, $replace, $sql);
 481                 } while ($oldsql != $sql);
 482
 483                 return $sql;
 484         }
 485
 486
 487         /**
 488          * @brief Replaces the ? placeholders with the parameters in the $args array
 489          *
 490          * @param string $sql SQL query
 491          * @param array $args The parameters that are to replace the ? placeholders
 492          * @return string The replaced SQL query
 493          */
 494         static private function replace_parameters($sql, $args) {
 495                 $offset = 0;
 496                 foreach ($args AS $param => $value) {
 497                         if (is_int($args[$param]) || is_float($args[$param])) {
 498                                 $replace = intval($args[$param]);
 499                         } else {
 500                                 $replace = "'".self::$dbo->escape($args[$param])."'";
 501                         }
 502
 503                         $pos = strpos($sql, '?', $offset);
 504                         if ($pos !== false) {
 505                                 $sql = substr_replace($sql, $replace, $pos, 1);
 506                         }
 507                         $offset = $pos + strlen($replace);
 508                 }
 509                 return $sql;
 510         }
 511
 512         /**
 513          * @brief Convert parameter array to an universal form
 514          * @param array $args Parameter array
 515          * @return array universalized parameter array
 516          */
 517         private static function getParam($args) {
 518                 unset($args[0]);
 519
 520                 // When the second function parameter is an array then use this as the parameter array
 521                 if ((count($args) > 0) && (is_array($args[1]))) {
 522                         return $args[1];
 523                 } else {
 524                         return $args;
 525                 }
 526         }
 527
 528         /**
 529          * @brief Executes a prepared statement that returns data
 530          * @usage Example: $r = p("SELECT * FROM `item` WHERE `guid` = ?", $guid);
 531          * @param string $sql SQL statement
 532          * @return object statement object
 533          */
 534         static public function p($sql) {
 535                 $a = get_app();
 536
 537                 $stamp1 = microtime(true);
 538
 539                 $params = self::getParam(func_get_args());
 540
 541                 // Renumber the array keys to be sure that they fit
 542                 $i = 0;
 543                 $args = array();
 544                 foreach ($params AS $param) {
 545                         $args[++$i] = $param;
 546                 }
 547
 548                 if (!self::$dbo || !self::$dbo->connected) {
 549                         return false;
 550                 }
 551
 552                 if (substr_count($sql, '?') != count($args)) {
 553                         // Question: Should we continue or stop the query here?
 554                         logger('Parameter mismatch. Query "'.$sql.'" - Parameters '.print_r($args, true), LOGGER_DEBUG);
 555                 }
 556
 557                 $sql = self::$dbo->clean_query($sql);
 558                 $sql = self::$dbo->any_value_fallback($sql);
 559
 560                 $orig_sql = $sql;
 561
 562                 if (x($a->config,'system') && x($a->config['system'], 'db_callstack')) {
 563                         $sql = "/*".$a->callstack()." */ ".$sql;
 564                 }
 565
 566                 self::$dbo->error = '';
 567                 self::$dbo->errorno = 0;
 568                 self::$dbo->affected_rows = 0;
 569
 570                 // We have to make some things different if this function is called from "e"
 571                 $trace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 2);
 572
 573                 if (isset($trace[1])) {
 574                         $called_from = $trace[1];
 575                 } else {
 576                         // We use just something that is defined to avoid warnings
 577                         $called_from = $trace[0];
 578                 }
 579                 // We are having an own error logging in the function "e"
 580                 $called_from_e = ($called_from['function'] == 'e');
 581
 582                 switch (self::$dbo->driver) {
 583                         case 'pdo':
 584                                 if (!$stmt = self::$dbo->db->prepare($sql)) {
 585                                         $errorInfo = self::$dbo->db->errorInfo();
 586                                         self::$dbo->error = $errorInfo[2];
 587                                         self::$dbo->errorno = $errorInfo[1];
 588                                         $retval = false;
 589                                         break;
 590                                 }
 591
 592                                 foreach ($args AS $param => $value) {
 593                                         $stmt->bindParam($param, $args[$param]);
 594                                 }
 595
 596                                 if (!$stmt->execute()) {
 597                                         $errorInfo = $stmt->errorInfo();
 598                                         self::$dbo->error = $errorInfo[2];
 599                                         self::$dbo->errorno = $errorInfo[1];
 600                                         $retval = false;
 601                                 } else {
 602                                         $retval = $stmt;
 603                                         self::$dbo->affected_rows = $retval->rowCount();
 604                                 }
 605                                 break;
 606                         case 'mysqli':
 607                                 // There are SQL statements that cannot be executed with a prepared statement
 608                                 $parts = explode(' ', $orig_sql);
 609                                 $command = strtolower($parts[0]);
 610                                 $can_be_prepared = in_array($command, array('select', 'update', 'insert', 'delete'));
 611
 612                                 // The fallback routine currently only works with statements that doesn't return values
 613                                 if (!$can_be_prepared && $called_from_e) {
 614                                         $retval = self::$dbo->db->query(self::replace_parameters($sql, $args));
 615                                         if (self::$dbo->db->errno) {
 616                                                 self::$dbo->error = self::$dbo->db->error;
 617                                                 self::$dbo->errorno = self::$dbo->db->errno;
 618                                                 $retval = false;
 619                                         } else {
 620                                                 if (isset($retval->num_rows)) {
 621                                                         self::$dbo->affected_rows = $retval->num_rows;
 622                                                 } else {
 623                                                         self::$dbo->affected_rows = self::$dbo->db->affected_rows;
 624                                                 }
 625                                         }
 626                                         break;
 627                                 }
 628
 629                                 $stmt = self::$dbo->db->stmt_init();
 630
 631                                 if (!$stmt->prepare($sql)) {
 632                                         self::$dbo->error = $stmt->error;
 633                                         self::$dbo->errorno = $stmt->errno;
 634                                         $retval = false;
 635                                         break;
 636                                 }
 637
 638                                 $params = '';
 639                                 $values = array();
 640                                 foreach ($args AS $param => $value) {
 641                                         if (is_int($args[$param])) {
 642                                                 $params .= 'i';
 643                                         } elseif (is_float($args[$param])) {
 644                                                 $params .= 'd';
 645                                         } elseif (is_string($args[$param])) {
 646                                                 $params .= 's';
 647                                         } else {
 648                                                 $params .= 'b';
 649                                         }
 650                                         $values[] = &$args[$param];
 651                                 }
 652
 653                                 if (count($values) > 0) {
 654                                         array_unshift($values, $params);
 655                                         call_user_func_array(array($stmt, 'bind_param'), $values);
 656                                 }
 657
 658                                 if (!$stmt->execute()) {
 659                                         self::$dbo->error = self::$dbo->db->error;
 660                                         self::$dbo->errorno = self::$dbo->db->errno;
 661                                         $retval = false;
 662                                 } else {
 663                                         $stmt->store_result();
 664                                         $retval = $stmt;
 665                                         self::$dbo->affected_rows = $retval->affected_rows;
 666                                 }
 667                                 break;
 668                         case 'mysql':
 669                                 // For the old "mysql" functions we cannot use prepared statements
 670                                 $retval = mysql_query(self::replace_parameters($sql, $args), self::$dbo->db);
 671                                 if (mysql_errno(self::$dbo->db)) {
 672                                         self::$dbo->error = mysql_error(self::$dbo->db);
 673                                         self::$dbo->errorno = mysql_errno(self::$dbo->db);
 674                                 } else {
 675                                         self::$dbo->affected_rows = mysql_affected_rows($retval);
 676
 677                                         // Due to missing mysql_* support this here wasn't tested at all
 678                                         // See here: http://php.net/manual/en/function.mysql-num-rows.php
 679                                         if (self::$dbo->affected_rows <= 0) {
 680                                                 self::$dbo->affected_rows = mysql_num_rows($retval);
 681                                         }
 682                                 }
 683                                 break;
 684                 }
 685
 686                 // We are having an own error logging in the function "e"
 687                 if ((self::$dbo->errorno != 0) && !$called_from_e) {
 688                         // We have to preserve the error code, somewhere in the logging it get lost
 689                         $error = self::$dbo->error;
 690                         $errorno = self::$dbo->errorno;
 691
 692                         logger('DB Error '.self::$dbo->errorno.': '.self::$dbo->error."\n".
 693                                 $a->callstack(8)."\n".self::replace_parameters($sql, $params));
 694
 695                         self::$dbo->error = $error;
 696                         self::$dbo->errorno = $errorno;
 697                 }
 698
 699                 $a->save_timestamp($stamp1, 'database');
 700
 701                 if (x($a->config,'system') && x($a->config['system'], 'db_log')) {
 702
 703                         $stamp2 = microtime(true);
 704                         $duration = (float)($stamp2 - $stamp1);
 705
 706                         if (($duration > $a->config["system"]["db_loglimit"])) {
 707                                 $duration = round($duration, 3);
 708                                 $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
 709
 710                                 @file_put_contents($a->config["system"]["db_log"], datetime_convert()."\t".$duration."\t".
 711                                                 basename($backtrace[1]["file"])."\t".
 712                                                 $backtrace[1]["line"]."\t".$backtrace[2]["function"]."\t".
 713                                                 substr(self::replace_parameters($sql, $args), 0, 2000)."\n", FILE_APPEND);
 714                         }
 715                 }
 716                 return $retval;
 717         }
 718
 719         /**
 720          * @brief Executes a prepared statement like UPDATE or INSERT that doesn't return data
 721          *
 722          * @param string $sql SQL statement
 723          * @return boolean Was the query successfull? False is returned only if an error occurred
 724          */
 725         static public function e($sql) {
 726                 $a = get_app();
 727
 728                 $stamp = microtime(true);
 729
 730                 $params = self::getParam(func_get_args());
 731
 732                 // In a case of a deadlock we are repeating the query 20 times
 733                 $timeout = 20;
 734
 735                 do {
 736                         $stmt = self::p($sql, $params);
 737
 738                         if (is_bool($stmt)) {
 739                                 $retval = $stmt;
 740                         } elseif (is_object($stmt)) {
 741                                 $retval = true;
 742                         } else {
 743                                 $retval = false;
 744                         }
 745
 746                         self::close($stmt);
 747
 748                 } while ((self::$dbo->errorno == 1213) && (--$timeout > 0));
 749
 750                 if (self::$dbo->errorno != 0) {
 751                         // We have to preserve the error code, somewhere in the logging it get lost
 752                         $error = self::$dbo->error;
 753                         $errorno = self::$dbo->errorno;
 754
 755                         logger('DB Error '.self::$dbo->errorno.': '.self::$dbo->error."\n".
 756                                 $a->callstack(8)."\n".self::replace_parameters($sql, $params));
 757
 758                         self::$dbo->error = $error;
 759                         self::$dbo->errorno = $errorno;
 760                 }
 761
 762                 $a->save_timestamp($stamp, "database_write");
 763
 764                 return $retval;
 765         }
 766
 767         /**
 768          * @brief Check if data exists
 769          *
 770          * @param string $sql SQL statement
 771          * @return boolean Are there rows for that query?
 772          */
 773         static public function exists($sql) {
 774                 $params = self::getParam(func_get_args());
 775
 776                 $stmt = self::p($sql, $params);
 777
 778                 if (is_bool($stmt)) {
 779                         $retval = $stmt;
 780                 } else {
 781                         $retval = (self::num_rows($stmt) > 0);
 782                 }
 783
 784                 self::close($stmt);
 785
 786                 return $retval;
 787         }
 788
 789         /**
 790          * @brief Fetches the first row
 791          *
 792          * @param string $sql SQL statement
 793          * @return array first row of query
 794          */
 795         static public function fetch_first($sql) {
 796                 $params = self::getParam(func_get_args());
 797
 798                 $stmt = self::p($sql, $params);
 799
 800                 if (is_bool($stmt)) {
 801                         $retval = $stmt;
 802                 } else {
 803                         $retval = self::fetch($stmt);
 804                 }
 805
 806                 self::close($stmt);
 807
 808                 return $retval;
 809         }
 810
 811         /**
 812          * @brief Returns the number of affected rows of the last statement
 813          *
 814          * @return int Number of rows
 815          */
 816         static public function affected_rows() {
 817                 return self::$dbo->affected_rows;
 818         }
 819
 820         /**
 821          * @brief Returns the number of rows of a statement
 822          *
 823          * @param object Statement object
 824          * @return int Number of rows
 825          */
 826         static public function num_rows($stmt) {
 827                 if (!is_object($stmt)) {
 828                         return 0;
 829                 }
 830                 switch (self::$dbo->driver) {
 831                         case 'pdo':
 832                                 return $stmt->rowCount();
 833                         case 'mysqli':
 834                                 return $stmt->num_rows;
 835                         case 'mysql':
 836                                 return mysql_num_rows($stmt);
 837                 }
 838                 return 0;
 839         }
 840
 841         /**
 842          * @brief Fetch a single row
 843          *
 844          * @param object $stmt statement object
 845          * @return array current row
 846          */
 847         static public function fetch($stmt) {
 848                 if (!is_object($stmt)) {
 849                         return false;
 850                 }
 851
 852                 switch (self::$dbo->driver) {
 853                         case 'pdo':
 854                                 return $stmt->fetch(PDO::FETCH_ASSOC);
 855                         case 'mysqli':
 856                                 // This code works, but is slow
 857
 858                                 // Bind the result to a result array
 859                                 $cols = array();
 860
 861                                 $cols_num = array();
 862                                 for ($x = 0; $x < $stmt->field_count; $x++) {
 863                                         $cols[] = &$cols_num[$x];
 864                                 }
 865
 866                                 call_user_func_array(array($stmt, 'bind_result'), $cols);
 867
 868                                 if (!$stmt->fetch()) {
 869                                         return false;
 870                                 }
 871
 872                                 // The slow part:
 873                                 // We need to get the field names for the array keys
 874                                 // It seems that there is no better way to do this.
 875                                 $result = $stmt->result_metadata();
 876                                 $fields = $result->fetch_fields();
 877
 878                                 $columns = array();
 879                                 foreach ($cols_num AS $param => $col) {
 880                                         $columns[$fields[$param]->name] = $col;
 881                                 }
 882                                 return $columns;
 883                         case 'mysql':
 884                                 return mysql_fetch_array(self::$dbo->result, MYSQL_ASSOC);
 885                 }
 886         }
 887
 888         /**
 889          * @brief Insert a row into a table
 890          *
 891          * @param string $table Table name
 892          * @param array $param parameter array
 893          * @param bool $on_duplicate_update Do an update on a duplicate entry
 894          *
 895          * @return boolean was the insert successfull?
 896          */
 897         static public function insert($table, $param, $on_duplicate_update = false) {
 898                 $sql = "INSERT INTO `".self::$dbo->escape($table)."` (`".implode("`, `", array_keys($param))."`) VALUES (".
 899                         substr(str_repeat("?, ", count($param)), 0, -2).")";
 900
 901                 if ($on_duplicate_update) {
 902                         $sql .= " ON DUPLICATE KEY UPDATE `".implode("` = ?, `", array_keys($param))."` = ?";
 903
 904                         $values = array_values($param);
 905                         $param = array_merge_recursive($values, $values);
 906                 }
 907
 908                 return self::e($sql, $param);
 909         }
 910
 911         /**
 912          * @brief Locks a table for exclusive write access
 913          *
 914          * This function can be extended in the future to accept a table array as well.
 915          *
 916          * @param string $table Table name
 917          *
 918          * @return boolean was the lock successful?
 919          */
 920         static public function lock($table) {
 921                 // See here: https://dev.mysql.com/doc/refman/5.7/en/lock-tables-and-transactions.html
 922                 self::e("SET autocommit=0");
 923                 $success = self::e("LOCK TABLES `".self::$dbo->escape($table)."` WRITE");
 924                 if (!$success) {
 925                         self::e("SET autocommit=1");
 926                 } else {
 927                         self::$in_transaction = true;
 928                 }
 929                 return $success;
 930         }
 931
 932         /**
 933          * @brief Unlocks all locked tables
 934          *
 935          * @return boolean was the unlock successful?
 936          */
 937         static public function unlock() {
 938                 // See here: https://dev.mysql.com/doc/refman/5.7/en/lock-tables-and-transactions.html
 939                 self::e("COMMIT");
 940                 $success = self::e("UNLOCK TABLES");
 941                 self::e("SET autocommit=1");
 942                 self::$in_transaction = false;
 943                 return $success;
 944         }
 945
 946         /**
 947          * @brief Starts a transaction
 948          *
 949          * @return boolean Was the command executed successfully?
 950          */
 951         static public function transaction() {
 952                 if (!self::e('COMMIT')) {
 953                         return false;
 954                 }
 955                 if (!self::e('START TRANSACTION')) {
 956                         return false;
 957                 }
 958                 self::$in_transaction = true;
 959                 return true;
 960         }
 961
 962         /**
 963          * @brief Does a commit
 964          *
 965          * @return boolean Was the command executed successfully?
 966          */
 967         static public function commit() {
 968                 if (!self::e('COMMIT')) {
 969                         return false;
 970                 }
 971                 self::$in_transaction = false;
 972                 return true;
 973         }
 974
 975         /**
 976          * @brief Does a rollback
 977          *
 978          * @return boolean Was the command executed successfully?
 979          */
 980         static public function rollback() {
 981                 if (!self::e('ROLLBACK')) {
 982                         return false;
 983                 }
 984                 self::$in_transaction = false;
 985                 return true;
 986         }
 987
 988         /**
 989          * @brief Build the array with the table relations
 990          *
 991          * The array is build from the database definitions in dbstructure.php
 992          *
 993          * This process must only be started once, since the value is cached.
 994          */
 995         static private function build_relation_data() {
 996                 $definition = db_definition();
 997
 998                 foreach ($definition AS $table => $structure) {
 999                         foreach ($structure['fields'] AS $field => $field_struct) {
1000                                 if (isset($field_struct['relation'])) {
1001                                         foreach ($field_struct['relation'] AS $rel_table => $rel_field) {
1002                                                 self::$relation[$rel_table][$rel_field][$table][] = $field;
1003                                         }
1004                                 }
1005                         }
1006                 }
1007         }
1008
1009         /**
1010          * @brief Delete a row from a table
1011          *
1012          * @param string $table Table name
1013          * @param array $param parameter array
1014          * @param boolean $in_process Internal use: Only do a commit after the last delete
1015          * @param array $callstack Internal use: prevent endless loops
1016          *
1017          * @return boolean|array was the delete successfull? When $in_process is set: deletion data
1018          */
1019         static public function delete($table, $param, $in_process = false, &$callstack = array()) {
1020
1021                 $commands = array();
1022
1023                 // Create a key for the loop prevention
1024                 $key = $table.':'.implode(':', array_keys($param)).':'.implode(':', $param);
1025
1026                 // We quit when this key already exists in the callstack.
1027                 if (isset($callstack[$key])) {
1028                         return $commands;
1029                 }
1030
1031                 $callstack[$key] = true;
1032
1033                 $table = self::$dbo->escape($table);
1034
1035                 $commands[$key] = array('table' => $table, 'param' => $param);
1036
1037                 // To speed up the whole process we cache the table relations
1038                 if (count(self::$relation) == 0) {
1039                         self::build_relation_data();
1040                 }
1041
1042                 // Is there a relation entry for the table?
1043                 if (isset(self::$relation[$table])) {
1044                         // We only allow a simple "one field" relation.
1045                         $field = array_keys(self::$relation[$table])[0];
1046                         $rel_def = array_values(self::$relation[$table])[0];
1047
1048                         // Create a key for preventing double queries
1049                         $qkey = $field.'-'.$table.':'.implode(':', array_keys($param)).':'.implode(':', $param);
1050
1051                         // When the search field is the relation field, we don't need to fetch the rows
1052                         // This is useful when the leading record is already deleted in the frontend but the rest is done in the backend
1053                         if ((count($param) == 1) && ($field == array_keys($param)[0])) {
1054                                 foreach ($rel_def AS $rel_table => $rel_fields) {
1055                                         foreach ($rel_fields AS $rel_field) {
1056                                                 $retval = self::delete($rel_table, array($rel_field => array_values($param)[0]), true, $callstack);
1057                                                 $commands = array_merge($commands, $retval);
1058                                         }
1059                                 }
1060                         // We quit when this key already exists in the callstack.
1061                         } elseif (!isset($callstack[$qkey])) {
1062
1063                                 $callstack[$qkey] = true;
1064
1065                                 // Fetch all rows that are to be deleted
1066                                 $sql = "SELECT ".self::$dbo->escape($field)." FROM `".$table."` WHERE `".
1067                                 implode("` = ? AND `", array_keys($param))."` = ?";
1068
1069                                 $data = self::p($sql, $param);
1070                                 while ($row = self::fetch($data)) {
1071                                         // Now we accumulate the delete commands
1072                                         $retval = self::delete($table, array($field => $row[$field]), true, $callstack);
1073                                         $commands = array_merge($commands, $retval);
1074                                 }
1075
1076                                 // Since we had split the delete command we don't need the original command anymore
1077                                 unset($commands[$key]);
1078                         }
1079                 }
1080
1081                 if (!$in_process) {
1082                         // Now we finalize the process
1083                         $do_transaction = !self::$in_transaction;
1084
1085                         if ($do_transaction) {
1086                                 self::transaction();
1087                         }
1088
1089                         $compacted = array();
1090                         $counter = array();
1091                         foreach ($commands AS $command) {
1092                                 if (count($command['param']) > 1) {
1093                                         $sql = "DELETE FROM `".$command['table']."` WHERE `".
1094                                                 implode("` = ? AND `", array_keys($command['param']))."` = ?";
1095
1096                                         logger(self::replace_parameters($sql, $command['param']), LOGGER_DATA);
1097
1098                                         if (!self::e($sql, $command['param'])) {
1099                                                 if ($do_transaction) {
1100                                                         self::rollback();
1101                                                 }
1102                                                 return false;
1103                                         }
1104                                 } else {
1105                                         $key_table = $command['table'];
1106                                         $key_param = array_keys($command['param'])[0];
1107                                         $value = array_values($command['param'])[0];
1108
1109                                         // Split the SQL queries in chunks of 100 values
1110                                         // We do the $i stuff here to make the code better readable
1111                                         $i = $counter[$key_table][$key_param];
1112                                         if (count($compacted[$key_table][$key_param][$i]) > 100) {
1113                                                 ++$i;
1114                                         }
1115
1116                                         $compacted[$key_table][$key_param][$i][$value] = $value;
1117                                         $counter[$key_table][$key_param] = $i;
1118                                 }
1119                         }
1120                         foreach ($compacted AS $table => $values) {
1121                                 foreach ($values AS $field => $field_value_list) {
1122                                         foreach ($field_value_list AS $field_values) {
1123                                                 $sql = "DELETE FROM `".$table."` WHERE `".$field."` IN (".
1124                                                         substr(str_repeat("?, ", count($field_values)), 0, -2).");";
1125
1126                                                 logger(self::replace_parameters($sql, $field_values), LOGGER_DATA);
1127
1128                                                 if (!self::e($sql, $field_values)) {
1129                                                         if ($do_transaction) {
1130                                                                 self::rollback();
1131                                                         }
1132                                                         return false;
1133                                                 }
1134                                         }
1135                                 }
1136                         }
1137                         if ($do_transaction) {
1138                                 self::commit();
1139                         }
1140                         return true;
1141                 }
1142
1143                 return $commands;
1144         }
1145
1146         /**
1147          * @brief Updates rows
1148          *
1149          * Updates rows in the database. When $old_fields is set to an array,
1150          * the system will only do an update if the fields in that array changed.
1151          *
1152          * Attention:
1153          * Only the values in $old_fields are compared.
1154          * This is an intentional behaviour.
1155          *
1156          * Example:
1157          * We include the timestamp field in $fields but not in $old_fields.
1158          * Then the row will only get the new timestamp when the other fields had changed.
1159          *
1160          * When $old_fields is set to a boolean value the system will do this compare itself.
1161          * When $old_fields is set to "true" the system will do an insert if the row doesn't exists.
1162          *
1163          * Attention:
1164          * Only set $old_fields to a boolean value when you are sure that you will update a single row.
1165          * When you set $old_fields to "true" then $fields must contain all relevant fields!
1166          *
1167          * @param string $table Table name
1168          * @param array $fields contains the fields that are updated
1169          * @param array $condition condition array with the key values
1170          * @param array|boolean $old_fields array with the old field values that are about to be replaced (true = update on duplicate)
1171          *
1172          * @return boolean was the update successfull?
1173          */
1174         static public function update($table, $fields, $condition, $old_fields = array()) {
1175
1176                 $table = self::$dbo->escape($table);
1177
1178                 if (is_bool($old_fields)) {
1179                         $sql = "SELECT * FROM `".$table."` WHERE `".
1180                         implode("` = ? AND `", array_keys($condition))."` = ? LIMIT 1";
1181
1182                         $params = array_values($condition);
1183
1184                         $do_insert = $old_fields;
1185
1186                         $old_fields = self::fetch_first($sql, $params);
1187                         if (is_bool($old_fields)) {
1188                                 if ($do_insert) {
1189                                         $values = array_merge($condition, $fields);
1190                                         return self::insert($table, $values, $do_insert);
1191                                 }
1192                                 $old_fields = array();
1193                         }
1194                 }
1195
1196                 $do_update = (count($old_fields) == 0);
1197
1198                 foreach ($old_fields AS $fieldname => $content) {
1199                         if (isset($fields[$fieldname])) {
1200                                 if ($fields[$fieldname] == $content) {
1201                                         unset($fields[$fieldname]);
1202                                 } else {
1203                                         $do_update = true;
1204                                 }
1205                         }
1206                 }
1207
1208                 if (!$do_update || (count($fields) == 0)) {
1209                         return true;
1210                 }
1211
1212                 $sql = "UPDATE `".$table."` SET `".
1213                         implode("` = ?, `", array_keys($fields))."` = ? WHERE `".
1214                         implode("` = ? AND `", array_keys($condition))."` = ?";
1215
1216                 $params1 = array_values($fields);
1217                 $params2 = array_values($condition);
1218                 $params = array_merge_recursive($params1, $params2);
1219
1220                 return self::e($sql, $params);
1221         }
1222
1223         /**
1224          * @brief Select rows from a table
1225          *
1226          * @param string $table Table name
1227          * @param array $fields array of selected fields
1228          * @param array $condition array of fields for condition
1229          * @param array $params array of several parameters
1230          *
1231          * @return boolean|object If "limit" is equal "1" only a single row is returned, else a query object is returned
1232          *
1233          * Example:
1234          * $table = "item";
1235          * $fields = array("id", "uri", "uid", "network");
1236          * $condition = array("uid" => 1, "network" => 'dspr');
1237          * $params = array("order" => array("id", "received" => true), "limit" => 1);
1238          *
1239          * $data = dba::select($table, $fields, $condition, $params);
1240          */
1241         static public function select($table, $fields = array(), $condition = array(), $params = array()) {
1242                 if ($table == '') {
1243                         return false;
1244                 }
1245
1246                 if (count($fields) > 0) {
1247                         $select_fields = "`".implode("`, `", array_values($fields))."`";
1248                 } else {
1249                         $select_fields = "*";
1250                 }
1251
1252                 if (count($condition) > 0) {
1253                         $condition_string = " WHERE `".implode("` = ? AND `", array_keys($condition))."` = ?";
1254                 } else {
1255                         $condition_string = "";
1256                 }
1257
1258                 $param_string = '';
1259                 $single_row = false;
1260
1261                 if (isset($params['order'])) {
1262                         $param_string .= " ORDER BY ";
1263                         foreach ($params['order'] AS $fields => $order) {
1264                                 if (!is_int($fields)) {
1265                                         $param_string .= "`".$fields."` ".($order ? "DESC" : "ASC").", ";
1266                                 } else {
1267                                         $param_string .= "`".$order."`, ";
1268                                 }
1269                         }
1270                         $param_string = substr($param_string, 0, -2);
1271                 }
1272
1273                 if (isset($params['limit'])) {
1274                         if (is_int($params['limit'])) {
1275                                 $param_string .= " LIMIT ".$params['limit'];
1276                                 $single_row =($params['limit'] == 1);
1277                         }
1278                 }
1279
1280                 $sql = "SELECT ".$select_fields." FROM `".$table."`".$condition_string.$param_string;
1281
1282                 $result = self::p($sql, $condition);
1283
1284                 if (is_bool($result) || !$single_row) {
1285                         return $result;
1286                 } else {
1287                         $row = self::fetch($result);
1288                         self::close($result);
1289                         return $row;
1290                 }
1291         }
1292
1293
1294         /**
1295          * @brief Fills an array with data from a query
1296          *
1297          * @param object $stmt statement object
1298          * @return array Data array
1299          */
1300         static public function inArray($stmt, $do_close = true) {
1301                 $data = array();
1302                 while ($row = self::fetch($stmt)) {
1303                         $data[] = $row;
1304                 }
1305                 if ($do_close) {
1306                         self::close($stmt);
1307                 }
1308                 return $data;
1309         }
1310
1311         /**
1312          * @brief Closes the current statement
1313          *
1314          * @param object $stmt statement object
1315          * @return boolean was the close successfull?
1316          */
1317         static public function close($stmt) {
1318                 if (!is_object($stmt)) {
1319                         return false;
1320                 }
1321
1322                 switch (self::$dbo->driver) {
1323                         case 'pdo':
1324                                 return $stmt->closeCursor();
1325                         case 'mysqli':
1326                                 return $stmt->free_result();
1327                                 return $stmt->close();
1328                         case 'mysql':
1329                                 return mysql_free_result($stmt);
1330                 }
1331         }
1332 }
1333
1334 function printable($s) {
1335         $s = preg_replace("~([\x01-\x08\x0E-\x0F\x10-\x1F\x7F-\xFF])~",".", $s);
1336         $s = str_replace("\x00",'.',$s);
1337         if (x($_SERVER,'SERVER_NAME')) {
1338                 $s = escape_tags($s);
1339         }
1340         return $s;
1341 }
1342
1343 // Procedural functions
1344 function dbg($state) {
1345         global $db;
1346
1347         if ($db) {
1348                 $db->dbg($state);
1349         }
1350 }
1351
1352 function dbesc($str) {
1353         global $db;
1354
1355         if ($db && $db->connected) {
1356                 return($db->escape($str));
1357         } else {
1358                 return(str_replace("'","\\'",$str));
1359         }
1360 }
1361
1362 // Function: q($sql,$args);
1363 // Description: execute SQL query with printf style args.
1364 // Example: $r = q("SELECT * FROM `%s` WHERE `uid` = %d",
1365 //                   'user', 1);
1366 function q($sql) {
1367         global $db;
1368         $args = func_get_args();
1369         unset($args[0]);
1370
1371         if ($db && $db->connected) {
1372                 $sql = $db->clean_query($sql);
1373                 $sql = $db->any_value_fallback($sql);
1374                 $stmt = @vsprintf($sql,$args); // Disabled warnings
1375                 //logger("dba: q: $stmt", LOGGER_ALL);
1376                 if ($stmt === false)
1377                         logger('dba: vsprintf error: ' . print_r(debug_backtrace(),true), LOGGER_DEBUG);
1378
1379                 $db->log_index($stmt);
1380
1381                 return $db->q($stmt);
1382         }
1383
1384         /**
1385          *
1386          * This will happen occasionally trying to store the
1387          * session data after abnormal program termination
1388          *
1389          */
1390         logger('dba: no database: ' . print_r($args,true));
1391         return false;
1392 }
1393
1394 /**
1395  * @brief Performs a query with "dirty reads"
1396  *
1397  * By doing dirty reads (reading uncommitted data) no locks are performed
1398  * This function can be used to fetch data that doesn't need to be reliable.
1399  *
1400  * @param $args Query parameters (1 to N parameters of different types)
1401  * @return array Query array
1402  */
1403 function qu($sql) {
1404         global $db;
1405
1406         $args = func_get_args();
1407         unset($args[0]);
1408
1409         if ($db && $db->connected) {
1410                 $sql = $db->clean_query($sql);
1411                 $sql = $db->any_value_fallback($sql);
1412                 $stmt = @vsprintf($sql,$args); // Disabled warnings
1413                 if ($stmt === false)
1414                         logger('dba: vsprintf error: ' . print_r(debug_backtrace(),true), LOGGER_DEBUG);
1415
1416                 $db->log_index($stmt);
1417
1418                 $db->q("SET SESSION TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;");
1419                 $retval = $db->q($stmt);
1420                 $db->q("SET SESSION TRANSACTION ISOLATION LEVEL REPEATABLE READ;");
1421                 return $retval;
1422         }
1423
1424         /**
1425          *
1426          * This will happen occasionally trying to store the
1427          * session data after abnormal program termination
1428          *
1429          */
1430         logger('dba: no database: ' . print_r($args,true));
1431         return false;
1432 }
1433
1434 /**
1435  *
1436  * Raw db query, no arguments
1437  *
1438  */
1439 function dbq($sql) {
1440         global $db;
1441
1442         if ($db && $db->connected) {
1443                 $ret = $db->q($sql);
1444         } else {
1445                 $ret = false;
1446         }
1447         return $ret;
1448 }
1449
1450 // Caller is responsible for ensuring that any integer arguments to
1451 // dbesc_array are actually integers and not malformed strings containing
1452 // SQL injection vectors. All integer array elements should be specifically
1453 // cast to int to avoid trouble.
1454 function dbesc_array_cb(&$item, $key) {
1455         if (is_string($item))
1456                 $item = dbesc($item);
1457 }
1458
1459 function dbesc_array(&$arr) {
1460         if (is_array($arr) && count($arr)) {
1461                 array_walk($arr,'dbesc_array_cb');
1462         }
1463 }
1464
1465 function dba_timer() {
1466         return microtime(true);
1467 }