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