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         private $_server_info = '';
  25         private static $dbo;
  26
  27         function __construct($server, $user, $pass, $db, $install = false) {
  28                 $a = get_app();
  29
  30                 $stamp1 = microtime(true);
  31
  32                 $server = trim($server);
  33                 $user = trim($user);
  34                 $pass = trim($pass);
  35                 $db = trim($db);
  36
  37                 if (!(strlen($server) && strlen($user))) {
  38                         $this->connected = false;
  39                         $this->db = null;
  40                         return;
  41                 }
  42
  43                 if ($install) {
  44                         if (strlen($server) && ($server !== 'localhost') && ($server !== '127.0.0.1')) {
  45                                 if (! dns_get_record($server, DNS_A + DNS_CNAME + DNS_PTR)) {
  46                                         $this->error = sprintf(t('Cannot locate DNS info for database server \'%s\''), $server);
  47                                         $this->connected = false;
  48                                         $this->db = null;
  49                                         return;
  50                                 }
  51                         }
  52                 }
  53
  54                 if (class_exists('\PDO') && in_array('mysql', PDO::getAvailableDrivers())) {
  55                         $this->driver = 'pdo';
  56                         $connect = "mysql:host=".$server.";dbname=".$db;
  57                         if (isset($a->config["system"]["db_charset"])) {
  58                                 $connect .= ";charset=".$a->config["system"]["db_charset"];
  59                         }
  60                         $this->db = @new PDO($connect, $user, $pass);
  61                         if (!$this->db->errorCode()) {
  62                                 $this->connected = true;
  63                         }
  64                 } elseif (class_exists('mysqli')) {
  65                         $this->driver = 'mysqli';
  66                         $this->db = @new mysqli($server,$user,$pass,$db);
  67                         if (!mysqli_connect_errno()) {
  68                                 $this->connected = true;
  69
  70                                 if (isset($a->config["system"]["db_charset"])) {
  71                                         $this->db->set_charset($a->config["system"]["db_charset"]);
  72                                 }
  73                         }
  74                 } elseif (function_exists('mysql_connect')) {
  75                         $this->driver = 'mysql';
  76                         $this->db = mysql_connect($server,$user,$pass);
  77                         if ($this->db && mysql_select_db($db,$this->db)) {
  78                                 $this->connected = true;
  79
  80                                 if (isset($a->config["system"]["db_charset"])) {
  81                                         mysql_set_charset($a->config["system"]["db_charset"], $this->db);
  82                                 }
  83                         }
  84                 } else {
  85                         // No suitable SQL driver was found.
  86                         if (!$install) {
  87                                 system_unavailable();
  88                         }
  89                 }
  90
  91                 if (!$this->connected) {
  92                         $this->db = null;
  93                         if (!$install) {
  94                                 system_unavailable();
  95                         }
  96                 }
  97                 $a->save_timestamp($stamp1, "network");
  98
  99                 self::$dbo = $this;
 100         }
 101
 102         /**
 103          * @brief Returns the MySQL server version string
 104          *
 105          * This function discriminate between the deprecated mysql API and the current
 106          * object-oriented mysqli API. Example of returned string: 5.5.46-0+deb8u1
 107          *
 108          * @return string
 109          */
 110         public function server_info() {
 111                 if ($this->_server_info == '') {
 112                         switch ($this->driver) {
 113                                 case 'pdo':
 114                                         $this->_server_info = $this->db->getAttribute(PDO::ATTR_SERVER_VERSION);
 115                                         break;
 116                                 case 'mysqli':
 117                                         $this->_server_info = $this->db->server_info;
 118                                         break;
 119                                 case 'mysql':
 120                                         $this->_server_info = mysql_get_server_info($this->db);
 121                                         break;
 122                         }
 123                 }
 124                 return $this->_server_info;
 125         }
 126
 127         /**
 128          * @brief Returns the selected database name
 129          *
 130          * @return string
 131          */
 132         public function database_name() {
 133                 $r = $this->q("SELECT DATABASE() AS `db`");
 134
 135                 return $r[0]['db'];
 136         }
 137
 138         /**
 139          * @brief Analyze a database query and log this if some conditions are met.
 140          *
 141          * @param string $query The database query that will be analyzed
 142          */
 143         public function log_index($query) {
 144                 $a = get_app();
 145
 146                 if ($a->config["system"]["db_log_index"] == "") {
 147                         return;
 148                 }
 149
 150                 // Don't explain an explain statement
 151                 if (strtolower(substr($query, 0, 7)) == "explain") {
 152                         return;
 153                 }
 154
 155                 // Only do the explain on "select", "update" and "delete"
 156                 if (!in_array(strtolower(substr($query, 0, 6)), array("select", "update", "delete"))) {
 157                         return;
 158                 }
 159
 160                 $r = $this->q("EXPLAIN ".$query);
 161                 if (!dbm::is_result($r)) {
 162                         return;
 163                 }
 164
 165                 $watchlist = explode(',', $a->config["system"]["db_log_index_watch"]);
 166                 $blacklist = explode(',', $a->config["system"]["db_log_index_blacklist"]);
 167
 168                 foreach ($r AS $row) {
 169                         if ((intval($a->config["system"]["db_loglimit_index"]) > 0)) {
 170                                 $log = (in_array($row['key'], $watchlist) AND
 171                                         ($row['rows'] >= intval($a->config["system"]["db_loglimit_index"])));
 172                         } else {
 173                                 $log = false;
 174                         }
 175
 176                         if ((intval($a->config["system"]["db_loglimit_index_high"]) > 0) AND ($row['rows'] >= intval($a->config["system"]["db_loglimit_index_high"]))) {
 177                                 $log = true;
 178                         }
 179
 180                         if (in_array($row['key'], $blacklist) OR ($row['key'] == "")) {
 181                                 $log = false;
 182                         }
 183
 184                         if ($log) {
 185                                 $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
 186                                 @file_put_contents($a->config["system"]["db_log_index"], datetime_convert()."\t".
 187                                                 $row['key']."\t".$row['rows']."\t".$row['Extra']."\t".
 188                                                 basename($backtrace[1]["file"])."\t".
 189                                                 $backtrace[1]["line"]."\t".$backtrace[2]["function"]."\t".
 190                                                 substr($query, 0, 2000)."\n", FILE_APPEND);
 191                         }
 192                 }
 193         }
 194
 195         public function q($sql, $onlyquery = false) {
 196                 $a = get_app();
 197
 198                 if (!$this->db || !$this->connected) {
 199                         return false;
 200                 }
 201
 202                 $this->error = '';
 203
 204                 $connstr = ($this->connected() ? "Connected" : "Disonnected");
 205
 206                 $stamp1 = microtime(true);
 207
 208                 $orig_sql = $sql;
 209
 210                 if (x($a->config,'system') && x($a->config['system'], 'db_callstack')) {
 211                         $sql = "/*".$a->callstack()." */ ".$sql;
 212                 }
 213
 214                 $columns = 0;
 215
 216                 switch ($this->driver) {
 217                         case 'pdo':
 218                                 $result = @$this->db->query($sql);
 219                                 // Is used to separate between queries that returning data - or not
 220                                 if (!is_bool($result)) {
 221                                         $columns = $result->columnCount();
 222                                 }
 223                                 break;
 224                         case 'mysqli':
 225                                 $result = @$this->db->query($sql);
 226                                 break;
 227                         case 'mysql':
 228                                 $result = @mysql_query($sql,$this->db);
 229                                 break;
 230                 }
 231                 $stamp2 = microtime(true);
 232                 $duration = (float)($stamp2 - $stamp1);
 233
 234                 $a->save_timestamp($stamp1, "database");
 235
 236                 if (strtolower(substr($orig_sql, 0, 6)) != "select") {
 237                         $a->save_timestamp($stamp1, "database_write");
 238                 }
 239                 if (x($a->config,'system') && x($a->config['system'],'db_log')) {
 240                         if (($duration > $a->config["system"]["db_loglimit"])) {
 241                                 $duration = round($duration, 3);
 242                                 $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
 243                                 @file_put_contents($a->config["system"]["db_log"], datetime_convert()."\t".$duration."\t".
 244                                                 basename($backtrace[1]["file"])."\t".
 245                                                 $backtrace[1]["line"]."\t".$backtrace[2]["function"]."\t".
 246                                                 substr($sql, 0, 2000)."\n", FILE_APPEND);
 247                         }
 248                 }
 249
 250                 switch ($this->driver) {
 251                         case 'pdo':
 252                                 $errorInfo = $this->db->errorInfo();
 253                                 if ($errorInfo) {
 254                                         $this->error = $errorInfo[2];
 255                                         $this->errorno = $errorInfo[1];
 256                                 }
 257                                 break;
 258                         case 'mysqli':
 259                                 if ($this->db->errno) {
 260                                         $this->error = $this->db->error;
 261                                         $this->errorno = $this->db->errno;
 262                                 }
 263                                 break;
 264                         case 'mysql':
 265                                 if (mysql_errno($this->db)) {
 266                                         $this->error = mysql_error($this->db);
 267                                         $this->errorno = mysql_errno($this->db);
 268                                 }
 269                                 break;
 270                 }
 271                 if (strlen($this->error)) {
 272                         logger('DB Error ('.$connstr.') '.$this->errorno.': '.$this->error);
 273                 }
 274
 275                 if ($this->debug) {
 276
 277                         $mesg = '';
 278
 279                         if ($result === false) {
 280                                 $mesg = 'false';
 281                         } elseif ($result === true) {
 282                                 $mesg = 'true';
 283                         } else {
 284                                 switch ($this->driver) {
 285                                         case 'pdo':
 286                                                 $mesg = $result->rowCount().' results'.EOL;
 287                                                 break;
 288                                         case 'mysqli':
 289                                                 $mesg = $result->num_rows.' results'.EOL;
 290                                                 break;
 291                                         case 'mysql':
 292                                                 $mesg = mysql_num_rows($result).' results'.EOL;
 293                                                 break;
 294                                 }
 295                         }
 296
 297                         $str =  'SQL = ' . printable($sql) . EOL . 'SQL returned ' . $mesg
 298                                 . (($this->error) ? ' error: ' . $this->error : '')
 299                                 . EOL;
 300
 301                         logger('dba: ' . $str );
 302                 }
 303
 304                 /**
 305                  * If dbfail.out exists, we will write any failed calls directly to it,
 306                  * regardless of any logging that may or may nor be in effect.
 307                  * These usually indicate SQL syntax errors that need to be resolved.
 308                  */
 309
 310                 if ($result === false) {
 311                         logger('dba: ' . printable($sql) . ' returned false.' . "\n" . $this->error);
 312                         if (file_exists('dbfail.out')) {
 313                                 file_put_contents('dbfail.out', datetime_convert() . "\n" . printable($sql) . ' returned false' . "\n" . $this->error . "\n", FILE_APPEND);
 314                         }
 315                 }
 316
 317                 if (is_bool($result)) {
 318                         return $result;
 319                 }
 320                 if ($onlyquery) {
 321                         $this->result = $result;
 322                         return true;
 323                 }
 324
 325                 $r = array();
 326                 switch ($this->driver) {
 327                         case 'pdo':
 328                                 while ($x = $result->fetch(PDO::FETCH_ASSOC)) {
 329                                         $r[] = $x;
 330                                 }
 331                                 $result->closeCursor();
 332                                 break;
 333                         case 'mysqli':
 334                                 while ($x = $result->fetch_array(MYSQLI_ASSOC)) {
 335                                         $r[] = $x;
 336                                 }
 337                                 $result->free_result();
 338                                 break;
 339                         case 'mysql':
 340                                 while ($x = mysql_fetch_array($result, MYSQL_ASSOC)) {
 341                                         $r[] = $x;
 342                                 }
 343                                 mysql_free_result($result);
 344                                 break;
 345                 }
 346
 347                 // PDO doesn't return "true" on successful operations - like mysqli does
 348                 // Emulate this behaviour by checking if the query returned data and had columns
 349                 // This should be reliable enough
 350                 if (($this->driver == 'pdo') AND (count($r) == 0) AND ($columns == 0)) {
 351                         return true;
 352                 }
 353
 354                 //$a->save_timestamp($stamp1, "database");
 355
 356                 if ($this->debug) {
 357                         logger('dba: ' . printable(print_r($r, true)));
 358                 }
 359                 return($r);
 360         }
 361
 362         public function dbg($dbg) {
 363                 $this->debug = $dbg;
 364         }
 365
 366         public function escape($str) {
 367                 if ($this->db && $this->connected) {
 368                         switch ($this->driver) {
 369                                 case 'pdo':
 370                                         return substr(@$this->db->quote($str, PDO::PARAM_STR), 1, -1);
 371                                 case 'mysqli':
 372                                         return @$this->db->real_escape_string($str);
 373                                 case 'mysql':
 374                                         return @mysql_real_escape_string($str,$this->db);
 375                         }
 376                 }
 377         }
 378
 379         function connected() {
 380                 switch ($this->driver) {
 381                         case 'pdo':
 382                                 // Not sure if this really is working like expected
 383                                 $connected = ($this->db->getAttribute(PDO::ATTR_CONNECTION_STATUS) != "");
 384                                 break;
 385                         case 'mysqli':
 386                                 $connected = $this->db->ping();
 387                                 break;
 388                         case 'mysql':
 389                                 $connected = mysql_ping($this->db);
 390                                 break;
 391                 }
 392                 return $connected;
 393         }
 394
 395         function insert_id() {
 396                 switch ($this->driver) {
 397                         case 'pdo':
 398                                 $id = $this->db->lastInsertId();
 399                                 break;
 400                         case 'mysqli':
 401                                 $id = $this->db->insert_id;
 402                                 break;
 403                         case 'mysql':
 404                                 $id = mysql_insert_id($this->db);
 405                                 break;
 406                 }
 407                 return $id;
 408         }
 409
 410         function __destruct() {
 411                 if ($this->db) {
 412                         switch ($this->driver) {
 413                                 case 'pdo':
 414                                         $this->db = null;
 415                                         break;
 416                                 case 'mysqli':
 417                                         $this->db->close();
 418                                         break;
 419                                 case 'mysql':
 420                                         mysql_close($this->db);
 421                                         break;
 422                         }
 423                 }
 424         }
 425
 426         /**
 427          * @brief Replaces ANY_VALUE() function by MIN() function,
 428          *  if the database server does not support ANY_VALUE().
 429          *
 430          * Considerations for Standard SQL, or MySQL with ONLY_FULL_GROUP_BY (default since 5.7.5).
 431          * ANY_VALUE() is available from MySQL 5.7.5 https://dev.mysql.com/doc/refman/5.7/en/miscellaneous-functions.html
 432          * A standard fall-back is to use MIN().
 433          *
 434          * @param string $sql An SQL string without the values
 435          * @return string The input SQL string modified if necessary.
 436          */
 437         public function any_value_fallback($sql) {
 438                 $server_info = $this->server_info();
 439                 if (version_compare($server_info, '5.7.5', '<') ||
 440                         (stripos($server_info, 'MariaDB') !== false)) {
 441                         $sql = str_ireplace('ANY_VALUE(', 'MIN(', $sql);
 442                 }
 443                 return $sql;
 444         }
 445
 446         /**
 447          * @brief Replaces the ? placeholders with the parameters in the $args array
 448          *
 449          * @param string $sql SQL query
 450          * @param array $args The parameters that are to replace the ? placeholders
 451          * @return string The replaced SQL query
 452          */
 453         static private function replace_parameters($sql, $args) {
 454                 $offset = 0;
 455                 foreach ($args AS $param => $value) {
 456                         if (is_int($args[$param]) OR is_float($args[$param])) {
 457                                 $replace = intval($args[$param]);
 458                         } else {
 459                                 $replace = "'".dbesc($args[$param])."'";
 460                         }
 461
 462                         $pos = strpos($sql, '?', $offset);
 463                         if ($pos !== false) {
 464                                 $sql = substr_replace($sql, $replace, $pos, 1);
 465                         }
 466                         $offset = $pos + strlen($replace);
 467                 }
 468                 return $sql;
 469         }
 470
 471         /**
 472          * @brief Executes a prepared statement that returns data
 473          * @usage Example: $r = p("SELECT * FROM `item` WHERE `guid` = ?", $guid);
 474          * @param string $sql SQL statement
 475          * @return object statement object
 476          */
 477         static public function p($sql) {
 478                 $a = get_app();
 479
 480                 $stamp1 = microtime(true);
 481
 482                 $args = func_get_args();
 483                 unset($args[0]);
 484
 485                 if (!self::$dbo OR !self::$dbo->connected) {
 486                         return false;
 487                 }
 488
 489                 $sql = self::$dbo->any_value_fallback($sql);
 490
 491                 if (x($a->config,'system') && x($a->config['system'], 'db_callstack')) {
 492                         $sql = "/*".$a->callstack()." */ ".$sql;
 493                 }
 494
 495                 self::$dbo->error = '';
 496                 self::$dbo->errorno = 0;
 497
 498                 switch (self::$dbo->driver) {
 499                         case 'pdo':
 500                                 if (!$stmt = self::$dbo->db->prepare($sql)) {
 501                                         $errorInfo = self::$dbo->db->errorInfo();
 502                                         self::$dbo->error = $errorInfo[2];
 503                                         self::$dbo->errorno = $errorInfo[1];
 504                                         $retval = false;
 505                                         break;
 506                                 }
 507
 508                                 foreach ($args AS $param => $value) {
 509                                         $stmt->bindParam($param, $args[$param]);
 510                                 }
 511
 512                                 if (!$stmt->execute()) {
 513                                         $errorInfo = self::$dbo->db->errorInfo();
 514                                         self::$dbo->error = $errorInfo[2];
 515                                         self::$dbo->errorno = $errorInfo[1];
 516                                         $retval = false;
 517                                 } else {
 518                                         $retval = $stmt;
 519                                 }
 520                                 break;
 521                         case 'mysqli':
 522                                 $stmt = self::$dbo->db->stmt_init();
 523
 524                                 if (!$stmt->prepare($sql)) {
 525                                         self::$dbo->error = self::$dbo->db->error;
 526                                         self::$dbo->errorno = self::$dbo->db->errno;
 527                                         $retval = false;
 528                                         break;
 529                                 }
 530
 531                                 $params = '';
 532                                 $values = array();
 533                                 foreach ($args AS $param => $value) {
 534                                         if (is_int($args[$param])) {
 535                                                 $params .= 'i';
 536                                         } elseif (is_float($args[$param])) {
 537                                                 $params .= 'd';
 538                                         } elseif (is_string($args[$param])) {
 539                                                 $params .= 's';
 540                                         } else {
 541                                                 $params .= 'b';
 542                                         }
 543                                         $values[] = &$args[$param];
 544                                 }
 545
 546                                 array_unshift($values, $params);
 547
 548                                 call_user_func_array(array($stmt, 'bind_param'), $values);
 549
 550                                 if (!$stmt->execute()) {
 551                                         self::$dbo->error = self::$dbo->db->error;
 552                                         self::$dbo->errorno = self::$dbo->db->errno;
 553                                         $retval = false;
 554                                 } else {
 555                                         $stmt->store_result();
 556                                         $retval = $stmt;
 557                                 }
 558                                 break;
 559                         case 'mysql':
 560                                 // For the old "mysql" functions we cannot use prepared statements
 561                                 $retval = mysql_query(self::replace_parameters($sql, $args), self::$dbo->db);
 562                                 if (mysql_errno(self::$dbo->db)) {
 563                                         self::$dbo->error = mysql_error(self::$dbo->db);
 564                                         self::$dbo->errorno = mysql_errno(self::$dbo->db);
 565                                 }
 566                                 break;
 567                 }
 568
 569                 if (self::$dbo->errorno != 0) {
 570                         logger('DB Error '.self::$dbo->errorno.': '.self::$dbo->error);
 571                 }
 572
 573                 $a->save_timestamp($stamp1, 'database');
 574
 575                 if (x($a->config,'system') && x($a->config['system'], 'db_log')) {
 576
 577                         $stamp2 = microtime(true);
 578                         $duration = (float)($stamp2 - $stamp1);
 579
 580                         if (($duration > $a->config["system"]["db_loglimit"])) {
 581                                 $duration = round($duration, 3);
 582                                 $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
 583
 584                                 @file_put_contents($a->config["system"]["db_log"], datetime_convert()."\t".$duration."\t".
 585                                                 basename($backtrace[1]["file"])."\t".
 586                                                 $backtrace[1]["line"]."\t".$backtrace[2]["function"]."\t".
 587                                                 substr(self::replace_parameters($sql, $args), 0, 2000)."\n", FILE_APPEND);
 588                         }
 589                 }
 590                 return $retval;
 591         }
 592
 593         /**
 594          * @brief Executes a prepared statement like UPDATE or INSERT that doesn't return data
 595          *
 596          * @param string $sql SQL statement
 597          * @return boolean Was the query successfull? False is returned only if an error occurred
 598          */
 599         static public function e($sql) {
 600                 $a = get_app();
 601
 602                 $stamp = microtime(true);
 603
 604                 $args = func_get_args();
 605
 606                 $stmt = call_user_func_array('self::p', $args);
 607
 608                 if (is_bool($stmt)) {
 609                         $retval = $stmt;
 610                 } elseif (is_object($stmt)) {
 611                         $retval = true;
 612                 } else {
 613                         $retval = false;
 614                 }
 615
 616                 self::close($stmt);
 617
 618                 $a->save_timestamp($stamp, "database_write");
 619
 620                 return $retval;
 621         }
 622
 623         /**
 624          * @brief Check if data exists
 625          *
 626          * @param string $sql SQL statement
 627          * @return boolean Are there rows for that query?
 628          */
 629         static public function exists($sql) {
 630                 $args = func_get_args();
 631
 632                 $stmt = call_user_func_array('self::p', $args);
 633
 634                 if (is_bool($stmt)) {
 635                         $retval = $stmt;
 636                 } else {
 637                         $retval = (self::num_rows($stmt) > 0);
 638                 }
 639
 640                 self::close($stmt);
 641
 642                 return $retval;
 643         }
 644
 645         /**
 646          * @brief Fetches the first row
 647          *
 648          * @param string $sql SQL statement
 649          * @return array first row of query
 650          */
 651         static public function fetch_first($sql) {
 652                 $args = func_get_args();
 653
 654                 $stmt = call_user_func_array('self::p', $args);
 655
 656                 if (is_bool($stmt)) {
 657                         $retval = $stmt;
 658                 } else {
 659                         $retval = self::fetch($stmt);
 660                 }
 661
 662                 self::close($stmt);
 663
 664                 return $retval;
 665         }
 666
 667         /**
 668          * @brief Returns the number of rows of a statement
 669          *
 670          * @param object Statement object
 671          * @return int Number of rows
 672          */
 673         static public function num_rows($stmt) {
 674                 switch (self::$dbo->driver) {
 675                         case 'pdo':
 676                                 return $stmt->rowCount();
 677                         case 'mysqli':
 678                                 return $stmt->num_rows;
 679                         case 'mysql':
 680                                 return mysql_num_rows($stmt);
 681                 }
 682                 return 0;
 683         }
 684
 685         /**
 686          * @brief Fetch a single row
 687          *
 688          * @param object $stmt statement object
 689          * @return array current row
 690          */
 691         static public function fetch($stmt) {
 692                 if (!is_object($stmt)) {
 693                         return false;
 694                 }
 695
 696                 switch (self::$dbo->driver) {
 697                         case 'pdo':
 698                                 return $stmt->fetch(PDO::FETCH_ASSOC);
 699                         case 'mysqli':
 700                                 // This code works, but is slow
 701
 702                                 // Bind the result to a result array
 703                                 $cols = array();
 704
 705                                 $cols_num = array();
 706                                 for ($x = 0; $x < $stmt->field_count; $x++) {
 707                                         $cols[] = &$cols_num[$x];
 708                                 }
 709
 710                                 call_user_func_array(array($stmt, 'bind_result'), $cols);
 711
 712                                 if (!$stmt->fetch()) {
 713                                         return false;
 714                                 }
 715
 716                                 // The slow part:
 717                                 // We need to get the field names for the array keys
 718                                 // It seems that there is no better way to do this.
 719                                 $result = $stmt->result_metadata();
 720                                 $fields = $result->fetch_fields();
 721
 722                                 $columns = array();
 723                                 foreach ($cols_num AS $param => $col) {
 724                                         $columns[$fields[$param]->name] = $col;
 725                                 }
 726                                 return $columns;
 727                         case 'mysql':
 728                                 return mysql_fetch_array(self::$dbo->result, MYSQL_ASSOC);
 729                 }
 730         }
 731
 732         /**
 733          * @brief Insert a row into a table
 734          *
 735          * @param string $table Table name
 736          * @param array $param parameter array
 737          *
 738          * @return boolean was the insert successfull?
 739          */
 740         static public function insert($table, $param) {
 741                 $sql = "INSERT INTO `".$table."` (`".implode("`, `", array_keys($param))."`) VALUES (".
 742                         substr(str_repeat("?, ", count($param)), 0, -2).");";
 743
 744                 $sql = self::replace_parameters($sql, $param);
 745
 746                 return self::e($sql);
 747         }
 748
 749         /**
 750          * @brief Closes the current statement
 751          *
 752          * @param object $stmt statement object
 753          * @return boolean was the close successfull?
 754          */
 755         static public function close($stmt) {
 756                 if (!is_object($stmt)) {
 757                         return false;
 758                 }
 759
 760                 switch (self::$dbo->driver) {
 761                         case 'pdo':
 762                                 return $stmt->closeCursor();
 763                         case 'mysqli':
 764                                 return $stmt->free_result();
 765                                 return $stmt->close();
 766                         case 'mysql':
 767                                 return mysql_free_result($stmt);
 768                 }
 769         }
 770 }
 771
 772 function printable($s) {
 773         $s = preg_replace("~([\x01-\x08\x0E-\x0F\x10-\x1F\x7F-\xFF])~",".", $s);
 774         $s = str_replace("\x00",'.',$s);
 775         if (x($_SERVER,'SERVER_NAME')) {
 776                 $s = escape_tags($s);
 777         }
 778         return $s;
 779 }
 780
 781 // Procedural functions
 782 function dbg($state) {
 783         global $db;
 784
 785         if ($db) {
 786                 $db->dbg($state);
 787         }
 788 }
 789
 790 function dbesc($str) {
 791         global $db;
 792
 793         if ($db && $db->connected) {
 794                 return($db->escape($str));
 795         } else {
 796                 return(str_replace("'","\\'",$str));
 797         }
 798 }
 799
 800 // Function: q($sql,$args);
 801 // Description: execute SQL query with printf style args.
 802 // Example: $r = q("SELECT * FROM `%s` WHERE `uid` = %d",
 803 //                   'user', 1);
 804 function q($sql) {
 805         global $db;
 806         $args = func_get_args();
 807         unset($args[0]);
 808
 809         if ($db && $db->connected) {
 810                 $sql = $db->any_value_fallback($sql);
 811                 $stmt = @vsprintf($sql,$args); // Disabled warnings
 812                 //logger("dba: q: $stmt", LOGGER_ALL);
 813                 if ($stmt === false)
 814                         logger('dba: vsprintf error: ' . print_r(debug_backtrace(),true), LOGGER_DEBUG);
 815
 816                 $db->log_index($stmt);
 817
 818                 return $db->q($stmt);
 819         }
 820
 821         /**
 822          *
 823          * This will happen occasionally trying to store the
 824          * session data after abnormal program termination
 825          *
 826          */
 827         logger('dba: no database: ' . print_r($args,true));
 828         return false;
 829 }
 830
 831 /**
 832  * @brief Performs a query with "dirty reads"
 833  *
 834  * By doing dirty reads (reading uncommitted data) no locks are performed
 835  * This function can be used to fetch data that doesn't need to be reliable.
 836  *
 837  * @param $args Query parameters (1 to N parameters of different types)
 838  * @return array Query array
 839  */
 840 function qu($sql) {
 841         global $db;
 842
 843         $args = func_get_args();
 844         unset($args[0]);
 845
 846         if ($db && $db->connected) {
 847                 $sql = $db->any_value_fallback($sql);
 848                 $stmt = @vsprintf($sql,$args); // Disabled warnings
 849                 if ($stmt === false)
 850                         logger('dba: vsprintf error: ' . print_r(debug_backtrace(),true), LOGGER_DEBUG);
 851
 852                 $db->log_index($stmt);
 853
 854                 $db->q("SET SESSION TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;");
 855                 $retval = $db->q($stmt);
 856                 $db->q("SET SESSION TRANSACTION ISOLATION LEVEL REPEATABLE READ;");
 857                 return $retval;
 858         }
 859
 860         /**
 861          *
 862          * This will happen occasionally trying to store the
 863          * session data after abnormal program termination
 864          *
 865          */
 866         logger('dba: no database: ' . print_r($args,true));
 867         return false;
 868 }
 869
 870 /**
 871  *
 872  * Raw db query, no arguments
 873  *
 874  */
 875 function dbq($sql) {
 876         global $db;
 877
 878         if ($db && $db->connected) {
 879                 $ret = $db->q($sql);
 880         } else {
 881                 $ret = false;
 882         }
 883         return $ret;
 884 }
 885
 886 // Caller is responsible for ensuring that any integer arguments to
 887 // dbesc_array are actually integers and not malformed strings containing
 888 // SQL injection vectors. All integer array elements should be specifically
 889 // cast to int to avoid trouble.
 890 function dbesc_array_cb(&$item, $key) {
 891         if (is_string($item))
 892                 $item = dbesc($item);
 893 }
 894
 895 function dbesc_array(&$arr) {
 896         if (is_array($arr) && count($arr)) {
 897                 array_walk($arr,'dbesc_array_cb');
 898         }
 899 }
 900
 901 function dba_timer() {
 902         return microtime(true);
 903 }