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  */
  14
  15 class dba {
  16
  17         private $debug = 0;
  18         private $db;
  19         private $result;
  20         private $driver;
  21         public  $connected = false;
  22         public  $error = false;
  23         private $_server_info = '';
  24         private static $dbo;
  25
  26         function __construct($server, $user, $pass, $db, $install = false) {
  27                 $a = get_app();
  28
  29                 $stamp1 = microtime(true);
  30
  31                 $server = trim($server);
  32                 $user = trim($user);
  33                 $pass = trim($pass);
  34                 $db = trim($db);
  35
  36                 if (!(strlen($server) && strlen($user))) {
  37                         $this->connected = false;
  38                         $this->db = null;
  39                         return;
  40                 }
  41
  42                 if ($install) {
  43                         if (strlen($server) && ($server !== 'localhost') && ($server !== '127.0.0.1')) {
  44                                 if (! dns_get_record($server, DNS_A + DNS_CNAME + DNS_PTR)) {
  45                                         $this->error = sprintf(t('Cannot locate DNS info for database server \'%s\''), $server);
  46                                         $this->connected = false;
  47                                         $this->db = null;
  48                                         return;
  49                                 }
  50                         }
  51                 }
  52
  53                 if (class_exists('\PDO') && in_array('mysql', PDO::getAvailableDrivers())) {
  54                         $this->driver = 'pdo';
  55                         $connect = "mysql:host=".$server.";dbname=".$db;
  56                         if (isset($a->config["system"]["db_charset"])) {
  57                                 $connect .= ";charset=".$a->config["system"]["db_charset"];
  58                         }
  59                         $this->db = @new PDO($connect, $user, $pass);
  60                         if (!$this->db->errorCode()) {
  61                                 $this->connected = true;
  62                         }
  63                 } elseif (class_exists('mysqli')) {
  64                         $this->driver = 'mysqli';
  65                         $this->db = @new mysqli($server,$user,$pass,$db);
  66                         if (!mysqli_connect_errno()) {
  67                                 $this->connected = true;
  68
  69                                 if (isset($a->config["system"]["db_charset"])) {
  70                                         $this->db->set_charset($a->config["system"]["db_charset"]);
  71                                 }
  72                         }
  73                 } elseif (function_exists('mysql_connect')) {
  74                         $this->driver = 'mysql';
  75                         $this->db = mysql_connect($server,$user,$pass);
  76                         if ($this->db && mysql_select_db($db,$this->db)) {
  77                                 $this->connected = true;
  78
  79                                 if (isset($a->config["system"]["db_charset"])) {
  80                                         mysql_set_charset($a->config["system"]["db_charset"], $this->db);
  81                                 }
  82                         }
  83                 } else {
  84                         // No suitable SQL driver was found.
  85                         if (!$install) {
  86                                 system_unavailable();
  87                         }
  88                 }
  89
  90                 if (!$this->connected) {
  91                         $this->db = null;
  92                         if (!$install) {
  93                                 system_unavailable();
  94                         }
  95                 }
  96                 $a->save_timestamp($stamp1, "network");
  97
  98                 self::$dbo = $this;
  99         }
 100
 101         /**
 102          * @brief Returns the MySQL server version string
 103          *
 104          * This function discriminate between the deprecated mysql API and the current
 105          * object-oriented mysqli API. Example of returned string: 5.5.46-0+deb8u1
 106          *
 107          * @return string
 108          */
 109         public function server_info() {
 110                 if ($this->_server_info == '') {
 111                         switch ($this->driver) {
 112                                 case 'pdo':
 113                                         $this->_server_info = $this->db->getAttribute(PDO::ATTR_SERVER_VERSION);
 114                                         break;
 115                                 case 'mysqli':
 116                                         $this->_server_info = $this->db->server_info;
 117                                         break;
 118                                 case 'mysql':
 119                                         $this->_server_info = mysql_get_server_info($this->db);
 120                                         break;
 121                         }
 122                 }
 123                 return $this->_server_info;
 124         }
 125
 126         /**
 127          * @brief Returns the selected database name
 128          *
 129          * @return string
 130          */
 131         public function database_name() {
 132                 $r = $this->q("SELECT DATABASE() AS `db`");
 133
 134                 return $r[0]['db'];
 135         }
 136
 137         /**
 138          * @brief Returns the number of rows
 139          *
 140          * @return integer
 141          */
 142         public function num_rows() {
 143                 if (!$this->result) {
 144                         return 0;
 145                 }
 146
 147                 switch ($this->driver) {
 148                         case 'pdo':
 149                                 $rows = $this->result->rowCount();
 150                                 break;
 151                         case 'mysqli':
 152                                 $rows = $this->result->num_rows;
 153                                 break;
 154                         case 'mysql':
 155                                 $rows = mysql_num_rows($this->result);
 156                                 break;
 157                 }
 158                 return $rows;
 159         }
 160
 161         /**
 162          * @brief Analyze a database query and log this if some conditions are met.
 163          *
 164          * @param string $query The database query that will be analyzed
 165          */
 166         public function log_index($query) {
 167                 $a = get_app();
 168
 169                 if ($a->config["system"]["db_log_index"] == "") {
 170                         return;
 171                 }
 172
 173                 // Don't explain an explain statement
 174                 if (strtolower(substr($query, 0, 7)) == "explain") {
 175                         return;
 176                 }
 177
 178                 // Only do the explain on "select", "update" and "delete"
 179                 if (!in_array(strtolower(substr($query, 0, 6)), array("select", "update", "delete"))) {
 180                         return;
 181                 }
 182
 183                 $r = $this->q("EXPLAIN ".$query);
 184                 if (!dbm::is_result($r)) {
 185                         return;
 186                 }
 187
 188                 $watchlist = explode(',', $a->config["system"]["db_log_index_watch"]);
 189                 $blacklist = explode(',', $a->config["system"]["db_log_index_blacklist"]);
 190
 191                 foreach ($r AS $row) {
 192                         if ((intval($a->config["system"]["db_loglimit_index"]) > 0)) {
 193                                 $log = (in_array($row['key'], $watchlist) AND
 194                                         ($row['rows'] >= intval($a->config["system"]["db_loglimit_index"])));
 195                         } else {
 196                                 $log = false;
 197                         }
 198
 199                         if ((intval($a->config["system"]["db_loglimit_index_high"]) > 0) AND ($row['rows'] >= intval($a->config["system"]["db_loglimit_index_high"]))) {
 200                                 $log = true;
 201                         }
 202
 203                         if (in_array($row['key'], $blacklist) OR ($row['key'] == "")) {
 204                                 $log = false;
 205                         }
 206
 207                         if ($log) {
 208                                 $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
 209                                 @file_put_contents($a->config["system"]["db_log_index"], datetime_convert()."\t".
 210                                                 $row['key']."\t".$row['rows']."\t".$row['Extra']."\t".
 211                                                 basename($backtrace[1]["file"])."\t".
 212                                                 $backtrace[1]["line"]."\t".$backtrace[2]["function"]."\t".
 213                                                 substr($query, 0, 2000)."\n", FILE_APPEND);
 214                         }
 215                 }
 216         }
 217
 218         public function q($sql, $onlyquery = false) {
 219                 $a = get_app();
 220
 221                 if (!$this->db || !$this->connected) {
 222                         return false;
 223                 }
 224
 225                 $this->error = '';
 226
 227                 $connstr = ($this->connected() ? "Connected" : "Disonnected");
 228
 229                 $stamp1 = microtime(true);
 230
 231                 $orig_sql = $sql;
 232
 233                 if (x($a->config,'system') && x($a->config['system'], 'db_callstack')) {
 234                         $sql = "/*".$a->callstack()." */ ".$sql;
 235                 }
 236
 237                 $columns = 0;
 238
 239                 switch ($this->driver) {
 240                         case 'pdo':
 241                                 $result = @$this->db->query($sql);
 242                                 // Is used to separate between queries that returning data - or not
 243                                 if (!is_bool($result)) {
 244                                         $columns = $result->columnCount();
 245                                 }
 246                                 break;
 247                         case 'mysqli':
 248                                 $result = @$this->db->query($sql);
 249                                 break;
 250                         case 'mysql':
 251                                 $result = @mysql_query($sql,$this->db);
 252                                 break;
 253                 }
 254                 $stamp2 = microtime(true);
 255                 $duration = (float)($stamp2-$stamp1);
 256
 257                 $a->save_timestamp($stamp1, "database");
 258
 259                 if (strtolower(substr($orig_sql, 0, 6)) != "select") {
 260                         $a->save_timestamp($stamp1, "database_write");
 261                 }
 262                 if (x($a->config,'system') && x($a->config['system'],'db_log')) {
 263                         if (($duration > $a->config["system"]["db_loglimit"])) {
 264                                 $duration = round($duration, 3);
 265                                 $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
 266                                 @file_put_contents($a->config["system"]["db_log"], datetime_convert()."\t".$duration."\t".
 267                                                 basename($backtrace[1]["file"])."\t".
 268                                                 $backtrace[1]["line"]."\t".$backtrace[2]["function"]."\t".
 269                                                 substr($sql, 0, 2000)."\n", FILE_APPEND);
 270                         }
 271                 }
 272
 273                 switch ($this->driver) {
 274                         case 'pdo':
 275                                 $errorInfo = $this->db->errorInfo();
 276                                 if ($errorInfo) {
 277                                         $this->error = $errorInfo[2];
 278                                         $this->errorno = $errorInfo[1];
 279                                 }
 280                                 break;
 281                         case 'mysqli':
 282                                 if ($this->db->errno) {
 283                                         $this->error = $this->db->error;
 284                                         $this->errorno = $this->db->errno;
 285                                 }
 286                                 break;
 287                         case 'mysql':
 288                                 if (mysql_errno($this->db)) {
 289                                         $this->error = mysql_error($this->db);
 290                                         $this->errorno = mysql_errno($this->db);
 291                                 }
 292                                 break;
 293                 }
 294                 if (strlen($this->error)) {
 295                         logger('DB Error ('.$connstr.') '.$this->errorno.': '.$this->error);
 296                 }
 297
 298                 if ($this->debug) {
 299
 300                         $mesg = '';
 301
 302                         if ($result === false) {
 303                                 $mesg = 'false';
 304                         } elseif ($result === true) {
 305                                 $mesg = 'true';
 306                         } else {
 307                                 switch ($this->driver) {
 308                                         case 'pdo':
 309                                                 $mesg = $result->rowCount().' results'.EOL;
 310                                                 break;
 311                                         case 'mysqli':
 312                                                 $mesg = $result->num_rows.' results'.EOL;
 313                                                 break;
 314                                         case 'mysql':
 315                                                 $mesg = mysql_num_rows($result).' results'.EOL;
 316                                                 break;
 317                                 }
 318                         }
 319
 320                         $str =  'SQL = ' . printable($sql) . EOL . 'SQL returned ' . $mesg
 321                                 . (($this->error) ? ' error: ' . $this->error : '')
 322                                 . EOL;
 323
 324                         logger('dba: ' . $str );
 325                 }
 326
 327                 /**
 328                  * If dbfail.out exists, we will write any failed calls directly to it,
 329                  * regardless of any logging that may or may nor be in effect.
 330                  * These usually indicate SQL syntax errors that need to be resolved.
 331                  */
 332
 333                 if ($result === false) {
 334                         logger('dba: ' . printable($sql) . ' returned false.' . "\n" . $this->error);
 335                         if (file_exists('dbfail.out')) {
 336                                 file_put_contents('dbfail.out', datetime_convert() . "\n" . printable($sql) . ' returned false' . "\n" . $this->error . "\n", FILE_APPEND);
 337                         }
 338                 }
 339
 340                 if (is_bool($result)) {
 341                         return $result;
 342                 }
 343                 if ($onlyquery) {
 344                         $this->result = $result;
 345                         return true;
 346                 }
 347
 348                 $r = array();
 349                 switch ($this->driver) {
 350                         case 'pdo':
 351                                 while ($x = $result->fetch(PDO::FETCH_ASSOC)) {
 352                                         $r[] = $x;
 353                                 }
 354                                 $result->closeCursor();
 355                                 break;
 356                         case 'mysqli':
 357                                 while ($x = $result->fetch_array(MYSQLI_ASSOC)) {
 358                                         $r[] = $x;
 359                                 }
 360                                 $result->free_result();
 361                                 break;
 362                         case 'mysql':
 363                                 while ($x = mysql_fetch_array($result, MYSQL_ASSOC)) {
 364                                         $r[] = $x;
 365                                 }
 366                                 mysql_free_result($result);
 367                                 break;
 368                 }
 369
 370                 // PDO doesn't return "true" on successful operations - like mysqli does
 371                 // Emulate this behaviour by checking if the query returned data and had columns
 372                 // This should be reliable enough
 373                 if (($this->driver == 'pdo') AND (count($r) == 0) AND ($columns == 0)) {
 374                         return true;
 375                 }
 376
 377                 //$a->save_timestamp($stamp1, "database");
 378
 379                 if ($this->debug) {
 380                         logger('dba: ' . printable(print_r($r, true)));
 381                 }
 382                 return($r);
 383         }
 384
 385         public function qfetch() {
 386                 $x = false;
 387
 388                 if ($this->result) {
 389                         switch ($this->driver) {
 390                                 case 'pdo':
 391                                         $x = $this->result->fetch(PDO::FETCH_ASSOC);
 392                                         break;
 393                                 case 'mysqli':
 394                                         $x = $this->result->fetch_array(MYSQLI_ASSOC);
 395                                         break;
 396                                 case 'mysql':
 397                                         $x = mysql_fetch_array($this->result, MYSQL_ASSOC);
 398                                         break;
 399                         }
 400                 }
 401                 return($x);
 402         }
 403
 404         public function qclose() {
 405                 if ($this->result) {
 406                         switch ($this->driver) {
 407                                 case 'pdo':
 408                                         $this->result->closeCursor();
 409                                         break;
 410                                 case 'mysqli':
 411                                         $this->result->free_result();
 412                                         break;
 413                                 case 'mysql':
 414                                         mysql_free_result($this->result);
 415                                         break;
 416                         }
 417                 }
 418         }
 419
 420         public function dbg($dbg) {
 421                 $this->debug = $dbg;
 422         }
 423
 424         public function escape($str) {
 425                 if ($this->db && $this->connected) {
 426                         switch ($this->driver) {
 427                                 case 'pdo':
 428                                         return substr(@$this->db->quote($str, PDO::PARAM_STR), 1, -1);
 429                                 case 'mysqli':
 430                                         return @$this->db->real_escape_string($str);
 431                                 case 'mysql':
 432                                         return @mysql_real_escape_string($str,$this->db);
 433                         }
 434                 }
 435         }
 436
 437         function connected() {
 438                 switch ($this->driver) {
 439                         case 'pdo':
 440                                 // Not sure if this really is working like expected
 441                                 $connected = ($this->db->getAttribute(PDO::ATTR_CONNECTION_STATUS) != "");
 442                                 break;
 443                         case 'mysqli':
 444                                 $connected = $this->db->ping();
 445                                 break;
 446                         case 'mysql':
 447                                 $connected = mysql_ping($this->db);
 448                                 break;
 449                 }
 450                 return $connected;
 451         }
 452
 453         function insert_id() {
 454                 switch ($this->driver) {
 455                         case 'pdo':
 456                                 $id = $this->db->lastInsertId();
 457                                 break;
 458                         case 'mysqli':
 459                                 $id = $this->db->insert_id;
 460                                 break;
 461                         case 'mysql':
 462                                 $id = mysql_insert_id($this->db);
 463                                 break;
 464                 }
 465                 return $id;
 466         }
 467
 468         function __destruct() {
 469                 if ($this->db) {
 470                         switch ($this->driver) {
 471                                 case 'pdo':
 472                                         $this->db = null;
 473                                         break;
 474                                 case 'mysqli':
 475                                         $this->db->close();
 476                                         break;
 477                                 case 'mysql':
 478                                         mysql_close($this->db);
 479                                         break;
 480                         }
 481                 }
 482         }
 483
 484         /**
 485          * @brief Replaces ANY_VALUE() function by MIN() function,
 486          *  if the database server does not support ANY_VALUE().
 487          *
 488          * Considerations for Standard SQL, or MySQL with ONLY_FULL_GROUP_BY (default since 5.7.5).
 489          * ANY_VALUE() is available from MySQL 5.7.5 https://dev.mysql.com/doc/refman/5.7/en/miscellaneous-functions.html
 490          * A standard fall-back is to use MIN().
 491          *
 492          * @param string $sql An SQL string without the values
 493          * @return string The input SQL string modified if necessary.
 494          */
 495         public function any_value_fallback($sql) {
 496                 $server_info = $this->server_info();
 497                 if (version_compare($server_info, '5.7.5', '<') ||
 498                         (stripos($server_info, 'MariaDB') !== false)) {
 499                         $sql = str_ireplace('ANY_VALUE(', 'MIN(', $sql);
 500                 }
 501                 return $sql;
 502         }
 503
 504         /**
 505          * @brief Executes a prepared statement
 506          *
 507          * @param string $sql SQL statement
 508          * @return object statement object
 509          */
 510         static public function p($sql) {
 511                 $a = get_app();
 512
 513                 $stamp1 = microtime(true);
 514
 515                 $args = func_get_args();
 516                 unset($args[0]);
 517
 518                 if (!self::$dbo OR !self::$dbo->connected) {
 519                         return false;
 520                 }
 521
 522                 $sql = self::$dbo->any_value_fallback($sql);
 523
 524                 $orig_sql = $sql;
 525
 526                 if (x($a->config,'system') && x($a->config['system'], 'db_callstack')) {
 527                         $sql = "/*".$a->callstack()." */ ".$sql;
 528                 }
 529
 530                 switch (self::$dbo->driver) {
 531                         case 'pdo':
 532                                 $stmt = self::$dbo->db->prepare($sql);
 533
 534                                 foreach ($args AS $param => $value) {
 535                                         $stmt->bindParam($param, $args[$param]);
 536                                 }
 537
 538                                 $success = $stmt->execute();
 539
 540                                 if ($success) {
 541                                         $retval = $stmt;
 542                                 } else {
 543                                         $retval = false;
 544                                 }
 545
 546                                 $errorInfo = self::$dbo->db->errorInfo();
 547
 548                                 if ($errorInfo) {
 549                                         self::$dbo->error = $errorInfo[2];
 550                                         self::$dbo->errorno = $errorInfo[1];
 551                                 }
 552
 553                                 break;
 554                         case 'mysqli':
 555                                 $stmt = self::$dbo->db->stmt_init();
 556
 557                                 if (!$stmt->prepare($sql)) {
 558                                         self::$dbo->error = self::$dbo->db->error;
 559                                         self::$dbo->errorno = self::$dbo->db->errno;
 560                                         $retval = false;
 561                                         break;
 562                                 }
 563
 564                                 $params = '';
 565                                 $values = array();
 566                                 foreach ($args AS $param => $value) {
 567                                         if (is_int($args[$param])) {
 568                                                 $params .= 'i';
 569                                         } elseif (is_float($args[$param])) {
 570                                                 $params .= 'd';
 571                                         } elseif (is_string($args[$param])) {
 572                                                 $params .= 's';
 573                                         } else {
 574                                                 $params .= 'b';
 575                                         }
 576                                         $values[] = &$args[$param];
 577                                 }
 578
 579                                 array_unshift($values, $params);
 580
 581                                 call_user_func_array(array($stmt, 'bind_param'), $values);
 582
 583                                 if (!$stmt->execute()) {
 584                                         self::$dbo->error = self::$dbo->db->error;
 585                                         self::$dbo->errorno = self::$dbo->db->errno;
 586                                         $retval = false;
 587                                 } elseif (method_exists($stmt, 'get_result')) {
 588                                         // Is mysqlnd installed?
 589                                         $retval = $stmt->get_result();
 590                                 } else {
 591                                         $retval = $stmt;
 592                                 }
 593                                 break;
 594                         case 'mysql':
 595                                 // For the old "mysql" functions we cannot use prepared statements
 596                                 foreach ($args AS $param => $value) {
 597                                         if (is_int($args[$param]) OR is_float($args[$param])) {
 598                                                 $replace = intval($args[$param]);
 599                                         } else {
 600                                                 $replace = "'".dbesc($args[$param])."'";
 601                                         }
 602
 603                                         $pos = strpos($sql, '?');
 604                                         if ($pos !== false) {
 605                                                 $sql = substr_replace($sql, $replace, $pos, 1);
 606                                         }
 607                                 }
 608
 609                                 $retval = mysql_query($sql, self::$dbo->db);
 610                                 if (mysql_errno(self::$dbo->db)) {
 611                                         self::$dbo->error = mysql_error(self::$dbo->db);
 612                                         self::$dbo->errorno = mysql_errno(self::$dbo->db);
 613                                 }
 614                                 break;
 615                 }
 616
 617                 $stamp2 = microtime(true);
 618                 $duration = (float)($stamp2 - $stamp1);
 619
 620                 $a->save_timestamp($stamp1, 'database');
 621
 622                 if (strtolower(substr($orig_sql, 0, 6)) != "select") {
 623                         $a->save_timestamp($stamp1, "database_write");
 624                 }
 625
 626                 return $retval;
 627         }
 628
 629         /**
 630          * @brief Executes a prepared statement
 631          *
 632          * @param string $sql SQL statement
 633          * @return boolean Was the query successfull?
 634          */
 635         static public function e($sql) {
 636                 $args = func_get_args();
 637
 638                 $stmt = self::p();
 639                 self::close($stmt);
 640         }
 641
 642         /**
 643          * @brief Fetch a single row
 644          *
 645          * @param object $stmt statement object
 646          * @return array current row
 647          */
 648         static public function fetch($stmt) {
 649                 switch (self::$dbo->driver) {
 650                         case 'pdo':
 651                                 return $stmt->fetch(PDO::FETCH_ASSOC);
 652                         case 'mysqli':
 653                                 // When mysqlnd is installed, we can use a shortcut
 654                                 if (method_exists($stmt, 'fetch_array')) {
 655                                         return $stmt->fetch_array(MYSQLI_ASSOC);
 656                                 }
 657
 658                                 // This code works, but is slow
 659
 660                                 // Bind the result to a result array
 661                                 $cols = array();
 662
 663                                 $cols_num = array();
 664                                 for ($x = 0; $x < $stmt->field_count; $x++) {
 665                                         $cols[] = &$cols_num[$x];
 666                                 }
 667
 668                                 call_user_func_array(array($stmt, 'bind_result'), $cols);
 669
 670                                 $success = $stmt->fetch();
 671
 672                                 if (!$success) {
 673                                         return false;
 674                                 }
 675
 676                                 // The slow part:
 677                                 // We need to get the field names for the array keys
 678                                 // It seems that there is no better way to do this.
 679                                 $result = $stmt->result_metadata();
 680
 681                                 $columns = array();
 682                                 foreach ($cols_num AS $col) {
 683                                         $field = $result->fetch_field();
 684                                         $columns[$field->name] = $col;
 685                                 }
 686                                 return $columns;
 687                         case 'mysql':
 688                                 return mysql_fetch_array(self::$dbo->result, MYSQL_ASSOC);
 689                 }
 690         }
 691
 692         /**
 693          * @brief Closes the current statement
 694          *
 695          * @param object $stmt statement object
 696          * @return boolean was the close successfull?
 697          */
 698         static public function close($stmt) {
 699                 switch (self::$dbo->driver) {
 700                         case 'pdo':
 701                                 return $stmt->closeCursor();
 702                         case 'mysqli':
 703                                 return $stmt->close();
 704                         case 'mysql':
 705                                 return mysql_free_result($stmt);
 706                 }
 707         }
 708 }
 709
 710 function printable($s) {
 711         $s = preg_replace("~([\x01-\x08\x0E-\x0F\x10-\x1F\x7F-\xFF])~",".", $s);
 712         $s = str_replace("\x00",'.',$s);
 713         if (x($_SERVER,'SERVER_NAME')) {
 714                 $s = escape_tags($s);
 715         }
 716         return $s;
 717 }
 718
 719 // Procedural functions
 720 function dbg($state) {
 721         global $db;
 722
 723         if ($db) {
 724                 $db->dbg($state);
 725         }
 726 }
 727
 728 function dbesc($str) {
 729         global $db;
 730
 731         if ($db && $db->connected) {
 732                 return($db->escape($str));
 733         } else {
 734                 return(str_replace("'","\\'",$str));
 735         }
 736 }
 737
 738 // Function: q($sql,$args);
 739 // Description: execute SQL query with printf style args.
 740 // Example: $r = q("SELECT * FROM `%s` WHERE `uid` = %d",
 741 //                   'user', 1);
 742 function q($sql) {
 743         global $db;
 744         $args = func_get_args();
 745         unset($args[0]);
 746
 747         if ($db && $db->connected) {
 748                 $sql = $db->any_value_fallback($sql);
 749                 $stmt = @vsprintf($sql,$args); // Disabled warnings
 750                 //logger("dba: q: $stmt", LOGGER_ALL);
 751                 if ($stmt === false)
 752                         logger('dba: vsprintf error: ' . print_r(debug_backtrace(),true), LOGGER_DEBUG);
 753
 754                 $db->log_index($stmt);
 755
 756                 return $db->q($stmt);
 757         }
 758
 759         /**
 760          *
 761          * This will happen occasionally trying to store the
 762          * session data after abnormal program termination
 763          *
 764          */
 765         logger('dba: no database: ' . print_r($args,true));
 766         return false;
 767 }
 768
 769 /**
 770  * @brief Performs a query with "dirty reads"
 771  *
 772  * By doing dirty reads (reading uncommitted data) no locks are performed
 773  * This function can be used to fetch data that doesn't need to be reliable.
 774  *
 775  * @param $args Query parameters (1 to N parameters of different types)
 776  * @return array Query array
 777  */
 778 function qu($sql) {
 779         global $db;
 780
 781         $args = func_get_args();
 782         unset($args[0]);
 783
 784         if ($db && $db->connected) {
 785                 $sql = $db->any_value_fallback($sql);
 786                 $stmt = @vsprintf($sql,$args); // Disabled warnings
 787                 if ($stmt === false)
 788                         logger('dba: vsprintf error: ' . print_r(debug_backtrace(),true), LOGGER_DEBUG);
 789
 790                 $db->log_index($stmt);
 791
 792                 $db->q("SET SESSION TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;");
 793                 $retval = $db->q($stmt);
 794                 $db->q("SET SESSION TRANSACTION ISOLATION LEVEL REPEATABLE READ;");
 795                 return $retval;
 796         }
 797
 798         /**
 799          *
 800          * This will happen occasionally trying to store the
 801          * session data after abnormal program termination
 802          *
 803          */
 804         logger('dba: no database: ' . print_r($args,true));
 805         return false;
 806 }
 807
 808 /**
 809  *
 810  * Raw db query, no arguments
 811  *
 812  */
 813 function dbq($sql) {
 814         global $db;
 815
 816         if ($db && $db->connected) {
 817                 $ret = $db->q($sql);
 818         } else {
 819                 $ret = false;
 820         }
 821         return $ret;
 822 }
 823
 824 // Caller is responsible for ensuring that any integer arguments to
 825 // dbesc_array are actually integers and not malformed strings containing
 826 // SQL injection vectors. All integer array elements should be specifically
 827 // cast to int to avoid trouble.
 828 function dbesc_array_cb(&$item, $key) {
 829         if (is_string($item))
 830                 $item = dbesc($item);
 831 }
 832
 833 function dbesc_array(&$arr) {
 834         if (is_array($arr) && count($arr)) {
 835                 array_walk($arr,'dbesc_array_cb');
 836         }
 837 }
 838
 839 function dba_timer() {
 840         return microtime(true);
 841 }