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