include/dba.php

   1 <?php
   2 use \Friendica\Core\System;
   3 use Friendica\Database\DBM;
   4
   5 require_once('include/datetime.php');
   6
   7 /**
   8  * @class MySQL database class
   9  *
  10  * This class is for the low level database stuff that does driver specific things.
  11  */
  12
  13 class dba {
  14         public static $connected = true;
  15
  16         private static $_server_info = '';
  17         private static $db;
  18         private static $driver;
  19         private static $error = false;
  20         private static $errorno = 0;
  21         private static $affected_rows = 0;
  22         private static $in_transaction = false;
  23         private static $relation = array();
  24
  25         public static function connect($serveraddr, $user, $pass, $db, $install = false) {
  26                 if (!is_null(self::$db)) {
  27                         return true;
  28                 }
  29
  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                         self::$connected = false;
  50                         self::$db = null;
  51                         return false;
  52                 }
  53
  54                 if ($install) {
  55                         if (strlen($server) && ($server !== 'localhost') && ($server !== '127.0.0.1')) {
  56                                 if (! dns_get_record($server, DNS_A + DNS_CNAME + DNS_PTR)) {
  57                                         self::$error = sprintf(t('Cannot locate DNS info for database server \'%s\''), $server);
  58                                         self::$connected = false;
  59                                         self::$db = null;
  60                                         return false;
  61                                 }
  62                         }
  63                 }
  64
  65                 if (class_exists('\PDO') && in_array('mysql', PDO::getAvailableDrivers())) {
  66                         self::$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                         try {
  77                                 self::$db = @new PDO($connect, $user, $pass);
  78                                 self::$connected = true;
  79                         } catch (PDOException $e) {
  80                                 self::$connected = false;
  81                         }
  82                 }
  83
  84                 if (!self::$connected && class_exists('mysqli')) {
  85                         self::$driver = 'mysqli';
  86                         self::$db = @new mysqli($server, $user, $pass, $db, $port);
  87                         if (!mysqli_connect_errno()) {
  88                                 self::$connected = true;
  89
  90                                 if (isset($a->config["system"]["db_charset"])) {
  91                                         self::$db->set_charset($a->config["system"]["db_charset"]);
  92                                 }
  93                         }
  94                 }
  95
  96                 // No suitable SQL driver was found.
  97                 if (!self::$connected) {
  98                         self::$db = null;
  99                         if (!$install) {
 100                                 system_unavailable();
 101                         }
 102                 }
 103                 $a->save_timestamp($stamp1, "network");
 104
 105                 return true;
 106         }
 107
 108         /**
 109          * @brief Returns the MySQL server version string
 110          *
 111          * This function discriminate between the deprecated mysql API and the current
 112          * object-oriented mysqli API. Example of returned string: 5.5.46-0+deb8u1
 113          *
 114          * @return string
 115          */
 116         public static function server_info() {
 117                 if (self::$_server_info == '') {
 118                         switch (self::$driver) {
 119                                 case 'pdo':
 120                                         self::$_server_info = self::$db->getAttribute(PDO::ATTR_SERVER_VERSION);
 121                                         break;
 122                                 case 'mysqli':
 123                                         self::$_server_info = self::$db->server_info;
 124                                         break;
 125                         }
 126                 }
 127                 return self::$_server_info;
 128         }
 129
 130         /**
 131          * @brief Returns the selected database name
 132          *
 133          * @return string
 134          */
 135         public static function database_name() {
 136                 $ret = self::p("SELECT DATABASE() AS `db`");
 137                 $data = self::inArray($ret);
 138                 return $data[0]['db'];
 139         }
 140
 141         /**
 142          * @brief Analyze a database query and log this if some conditions are met.
 143          *
 144          * @param string $query The database query that will be analyzed
 145          */
 146         private static function log_index($query) {
 147                 $a = get_app();
 148
 149                 if (empty($a->config["system"]["db_log_index"])) {
 150                         return;
 151                 }
 152
 153                 // Don't explain an explain statement
 154                 if (strtolower(substr($query, 0, 7)) == "explain") {
 155                         return;
 156                 }
 157
 158                 // Only do the explain on "select", "update" and "delete"
 159                 if (!in_array(strtolower(substr($query, 0, 6)), array("select", "update", "delete"))) {
 160                         return;
 161                 }
 162
 163                 $r = self::p("EXPLAIN ".$query);
 164                 if (!DBM::is_result($r)) {
 165                         return;
 166                 }
 167
 168                 $watchlist = explode(',', $a->config["system"]["db_log_index_watch"]);
 169                 $blacklist = explode(',', $a->config["system"]["db_log_index_blacklist"]);
 170
 171                 while ($row = dba::fetch($r)) {
 172                         if ((intval($a->config["system"]["db_loglimit_index"]) > 0)) {
 173                                 $log = (in_array($row['key'], $watchlist) &&
 174                                         ($row['rows'] >= intval($a->config["system"]["db_loglimit_index"])));
 175                         } else {
 176                                 $log = false;
 177                         }
 178
 179                         if ((intval($a->config["system"]["db_loglimit_index_high"]) > 0) && ($row['rows'] >= intval($a->config["system"]["db_loglimit_index_high"]))) {
 180                                 $log = true;
 181                         }
 182
 183                         if (in_array($row['key'], $blacklist) || ($row['key'] == "")) {
 184                                 $log = false;
 185                         }
 186
 187                         if ($log) {
 188                                 $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
 189                                 @file_put_contents($a->config["system"]["db_log_index"], datetime_convert()."\t".
 190                                                 $row['key']."\t".$row['rows']."\t".$row['Extra']."\t".
 191                                                 basename($backtrace[1]["file"])."\t".
 192                                                 $backtrace[1]["line"]."\t".$backtrace[2]["function"]."\t".
 193                                                 substr($query, 0, 2000)."\n", FILE_APPEND);
 194                         }
 195                 }
 196         }
 197
 198         public static function escape($str) {
 199                 switch (self::$driver) {
 200                         case 'pdo':
 201                                 return substr(@self::$db->quote($str, PDO::PARAM_STR), 1, -1);
 202                         case 'mysqli':
 203                                 return @self::$db->real_escape_string($str);
 204                 }
 205         }
 206
 207         public static function connected() {
 208                 $connected = false;
 209
 210                 switch (self::$driver) {
 211                         case 'pdo':
 212                                 $r = dba::p("SELECT 1");
 213                                 if (DBM::is_result($r)) {
 214                                         $row = dba::inArray($r);
 215                                         $connected = ($row[0]['1'] == '1');
 216                                 }
 217                                 break;
 218                         case 'mysqli':
 219                                 $connected = self::$db->ping();
 220                                 break;
 221                 }
 222                 return $connected;
 223         }
 224
 225         /**
 226          * @brief Replaces ANY_VALUE() function by MIN() function,
 227          *  if the database server does not support ANY_VALUE().
 228          *
 229          * Considerations for Standard SQL, or MySQL with ONLY_FULL_GROUP_BY (default since 5.7.5).
 230          * ANY_VALUE() is available from MySQL 5.7.5 https://dev.mysql.com/doc/refman/5.7/en/miscellaneous-functions.html
 231          * A standard fall-back is to use MIN().
 232          *
 233          * @param string $sql An SQL string without the values
 234          * @return string The input SQL string modified if necessary.
 235          */
 236         public static function any_value_fallback($sql) {
 237                 $server_info = self::server_info();
 238                 if (version_compare($server_info, '5.7.5', '<') ||
 239                         (stripos($server_info, 'MariaDB') !== false)) {
 240                         $sql = str_ireplace('ANY_VALUE(', 'MIN(', $sql);
 241                 }
 242                 return $sql;
 243         }
 244
 245         /**
 246          * @brief beautifies the query - useful for "SHOW PROCESSLIST"
 247          *
 248          * This is safe when we bind the parameters later.
 249          * The parameter values aren't part of the SQL.
 250          *
 251          * @param string $sql An SQL string without the values
 252          * @return string The input SQL string modified if necessary.
 253          */
 254         public static function clean_query($sql) {
 255                 $search = array("\t", "\n", "\r", "  ");
 256                 $replace = array(' ', ' ', ' ', ' ');
 257                 do {
 258                         $oldsql = $sql;
 259                         $sql = str_replace($search, $replace, $sql);
 260                 } while ($oldsql != $sql);
 261
 262                 return $sql;
 263         }
 264
 265
 266         /**
 267          * @brief Replaces the ? placeholders with the parameters in the $args array
 268          *
 269          * @param string $sql SQL query
 270          * @param array $args The parameters that are to replace the ? placeholders
 271          * @return string The replaced SQL query
 272          */
 273         private static function replace_parameters($sql, $args) {
 274                 $offset = 0;
 275                 foreach ($args AS $param => $value) {
 276                         if (is_int($args[$param]) || is_float($args[$param])) {
 277                                 $replace = intval($args[$param]);
 278                         } else {
 279                                 $replace = "'".self::escape($args[$param])."'";
 280                         }
 281
 282                         $pos = strpos($sql, '?', $offset);
 283                         if ($pos !== false) {
 284                                 $sql = substr_replace($sql, $replace, $pos, 1);
 285                         }
 286                         $offset = $pos + strlen($replace);
 287                 }
 288                 return $sql;
 289         }
 290
 291         /**
 292          * @brief Convert parameter array to an universal form
 293          * @param array $args Parameter array
 294          * @return array universalized parameter array
 295          */
 296         private static function getParam($args) {
 297                 unset($args[0]);
 298
 299                 // When the second function parameter is an array then use this as the parameter array
 300                 if ((count($args) > 0) && (is_array($args[1]))) {
 301                         return $args[1];
 302                 } else {
 303                         return $args;
 304                 }
 305         }
 306
 307         /**
 308          * @brief Executes a prepared statement that returns data
 309          * @usage Example: $r = p("SELECT * FROM `item` WHERE `guid` = ?", $guid);
 310          *
 311          * Please only use it with complicated queries.
 312          * For all regular queries please use dba::select or dba::exists
 313          *
 314          * @param string $sql SQL statement
 315          * @return object statement object
 316          */
 317         public static function p($sql) {
 318                 $a = get_app();
 319
 320                 $stamp1 = microtime(true);
 321
 322                 $params = self::getParam(func_get_args());
 323
 324                 // Renumber the array keys to be sure that they fit
 325                 $i = 0;
 326                 $args = array();
 327                 foreach ($params AS $param) {
 328                         // Avoid problems with some MySQL servers and boolean values. See issue #3645
 329                         if (is_bool($param)) {
 330                                 $param = (int)$param;
 331                         }
 332                         $args[++$i] = $param;
 333                 }
 334
 335                 if (!self::$connected) {
 336                         return false;
 337                 }
 338
 339                 if ((substr_count($sql, '?') != count($args)) && (count($args) > 0)) {
 340                         // Question: Should we continue or stop the query here?
 341                         logger('Parameter mismatch. Query "'.$sql.'" - Parameters '.print_r($args, true), LOGGER_DEBUG);
 342                 }
 343
 344                 $sql = self::clean_query($sql);
 345                 $sql = self::any_value_fallback($sql);
 346
 347                 $orig_sql = $sql;
 348
 349                 if (x($a->config,'system') && x($a->config['system'], 'db_callstack')) {
 350                         $sql = "/*".System::callstack()." */ ".$sql;
 351                 }
 352
 353                 self::$error = '';
 354                 self::$errorno = 0;
 355                 self::$affected_rows = 0;
 356
 357                 // We have to make some things different if this function is called from "e"
 358                 $trace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 2);
 359
 360                 if (isset($trace[1])) {
 361                         $called_from = $trace[1];
 362                 } else {
 363                         // We use just something that is defined to avoid warnings
 364                         $called_from = $trace[0];
 365                 }
 366                 // We are having an own error logging in the function "e"
 367                 $called_from_e = ($called_from['function'] == 'e');
 368
 369                 switch (self::$driver) {
 370                         case 'pdo':
 371                                 // If there are no arguments we use "query"
 372                                 if (count($args) == 0) {
 373                                         if (!$retval = self::$db->query($sql)) {
 374                                                 $errorInfo = self::$db->errorInfo();
 375                                                 self::$error = $errorInfo[2];
 376                                                 self::$errorno = $errorInfo[1];
 377                                                 $retval = false;
 378                                                 break;
 379                                         }
 380                                         self::$affected_rows = $retval->rowCount();
 381                                         break;
 382                                 }
 383
 384                                 if (!$stmt = self::$db->prepare($sql)) {
 385                                         $errorInfo = self::$db->errorInfo();
 386                                         self::$error = $errorInfo[2];
 387                                         self::$errorno = $errorInfo[1];
 388                                         $retval = false;
 389                                         break;
 390                                 }
 391
 392                                 foreach ($args AS $param => $value) {
 393                                         $stmt->bindParam($param, $args[$param]);
 394                                 }
 395
 396                                 if (!$stmt->execute()) {
 397                                         $errorInfo = $stmt->errorInfo();
 398                                         self::$error = $errorInfo[2];
 399                                         self::$errorno = $errorInfo[1];
 400                                         $retval = false;
 401                                 } else {
 402                                         $retval = $stmt;
 403                                         self::$affected_rows = $retval->rowCount();
 404                                 }
 405                                 break;
 406                         case 'mysqli':
 407                                 // There are SQL statements that cannot be executed with a prepared statement
 408                                 $parts = explode(' ', $orig_sql);
 409                                 $command = strtolower($parts[0]);
 410                                 $can_be_prepared = in_array($command, array('select', 'update', 'insert', 'delete'));
 411
 412                                 // The fallback routine is called as well when there are no arguments
 413                                 if (!$can_be_prepared || (count($args) == 0)) {
 414                                         $retval = self::$db->query(self::replace_parameters($sql, $args));
 415                                         if (self::$db->errno) {
 416                                                 self::$error = self::$db->error;
 417                                                 self::$errorno = self::$db->errno;
 418                                                 $retval = false;
 419                                         } else {
 420                                                 if (isset($retval->num_rows)) {
 421                                                         self::$affected_rows = $retval->num_rows;
 422                                                 } else {
 423                                                         self::$affected_rows = self::$db->affected_rows;
 424                                                 }
 425                                         }
 426                                         break;
 427                                 }
 428
 429                                 $stmt = self::$db->stmt_init();
 430
 431                                 if (!$stmt->prepare($sql)) {
 432                                         self::$error = $stmt->error;
 433                                         self::$errorno = $stmt->errno;
 434                                         $retval = false;
 435                                         break;
 436                                 }
 437
 438                                 $params = '';
 439                                 $values = array();
 440                                 foreach ($args AS $param => $value) {
 441                                         if (is_int($args[$param])) {
 442                                                 $params .= 'i';
 443                                         } elseif (is_float($args[$param])) {
 444                                                 $params .= 'd';
 445                                         } elseif (is_string($args[$param])) {
 446                                                 $params .= 's';
 447                                         } else {
 448                                                 $params .= 'b';
 449                                         }
 450                                         $values[] = &$args[$param];
 451                                 }
 452
 453                                 if (count($values) > 0) {
 454                                         array_unshift($values, $params);
 455                                         call_user_func_array(array($stmt, 'bind_param'), $values);
 456                                 }
 457
 458                                 if (!$stmt->execute()) {
 459                                         self::$error = self::$db->error;
 460                                         self::$errorno = self::$db->errno;
 461                                         $retval = false;
 462                                 } else {
 463                                         $stmt->store_result();
 464                                         $retval = $stmt;
 465                                         self::$affected_rows = $retval->affected_rows;
 466                                 }
 467                                 break;
 468                 }
 469
 470                 // We are having an own error logging in the function "e"
 471                 if ((self::$errorno != 0) && !$called_from_e) {
 472                         // We have to preserve the error code, somewhere in the logging it get lost
 473                         $error = self::$error;
 474                         $errorno = self::$errorno;
 475
 476                         logger('DB Error '.self::$errorno.': '.self::$error."\n".
 477                                 System::callstack(8)."\n".self::replace_parameters($sql, $params));
 478
 479                         self::$error = $error;
 480                         self::$errorno = $errorno;
 481                 }
 482
 483                 $a->save_timestamp($stamp1, 'database');
 484
 485                 if (x($a->config,'system') && x($a->config['system'], 'db_log')) {
 486
 487                         $stamp2 = microtime(true);
 488                         $duration = (float)($stamp2 - $stamp1);
 489
 490                         if (($duration > $a->config["system"]["db_loglimit"])) {
 491                                 $duration = round($duration, 3);
 492                                 $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
 493
 494                                 @file_put_contents($a->config["system"]["db_log"], datetime_convert()."\t".$duration."\t".
 495                                                 basename($backtrace[1]["file"])."\t".
 496                                                 $backtrace[1]["line"]."\t".$backtrace[2]["function"]."\t".
 497                                                 substr(self::replace_parameters($sql, $args), 0, 2000)."\n", FILE_APPEND);
 498                         }
 499                 }
 500                 return $retval;
 501         }
 502
 503         /**
 504          * @brief Executes a prepared statement like UPDATE or INSERT that doesn't return data
 505          *
 506          * Please use dba::delete, dba::insert, dba::update, ... instead
 507          *
 508          * @param string $sql SQL statement
 509          * @return boolean Was the query successfull? False is returned only if an error occurred
 510          */
 511         public static function e($sql) {
 512                 $a = get_app();
 513
 514                 $stamp = microtime(true);
 515
 516                 $params = self::getParam(func_get_args());
 517
 518                 // In a case of a deadlock we are repeating the query 20 times
 519                 $timeout = 20;
 520
 521                 do {
 522                         $stmt = self::p($sql, $params);
 523
 524                         if (is_bool($stmt)) {
 525                                 $retval = $stmt;
 526                         } elseif (is_object($stmt)) {
 527                                 $retval = true;
 528                         } else {
 529                                 $retval = false;
 530                         }
 531
 532                         self::close($stmt);
 533
 534                 } while ((self::$errorno == 1213) && (--$timeout > 0));
 535
 536                 if (self::$errorno != 0) {
 537                         // We have to preserve the error code, somewhere in the logging it get lost
 538                         $error = self::$error;
 539                         $errorno = self::$errorno;
 540
 541                         logger('DB Error '.self::$errorno.': '.self::$error."\n".
 542                                 System::callstack(8)."\n".self::replace_parameters($sql, $params));
 543
 544                         self::$error = $error;
 545                         self::$errorno = $errorno;
 546                 }
 547
 548                 $a->save_timestamp($stamp, "database_write");
 549
 550                 return $retval;
 551         }
 552
 553         /**
 554          * @brief Check if data exists
 555          *
 556          * @param string $table Table name
 557          * @param array $condition array of fields for condition
 558          *
 559          * @return boolean Are there rows for that condition?
 560          */
 561         public static function exists($table, $condition) {
 562                 if (empty($table)) {
 563                         return false;
 564                 }
 565
 566                 $fields = array();
 567
 568                 $array_element = each($condition);
 569                 $array_key = $array_element['key'];
 570                 if (!is_int($array_key)) {
 571                         $fields = array($array_key);
 572                 }
 573
 574                 $stmt = self::select($table, $fields, $condition, array('limit' => 1, 'only_query' => true));
 575
 576                 if (is_bool($stmt)) {
 577                         $retval = $stmt;
 578                 } else {
 579                         $retval = (self::num_rows($stmt) > 0);
 580                 }
 581
 582                 self::close($stmt);
 583
 584                 return $retval;
 585         }
 586
 587         /**
 588          * @brief Fetches the first row
 589          *
 590          * Please use dba::select or dba::exists whenever this is possible.
 591          *
 592          * @param string $sql SQL statement
 593          * @return array first row of query
 594          */
 595         public static function fetch_first($sql) {
 596                 $params = self::getParam(func_get_args());
 597
 598                 $stmt = self::p($sql, $params);
 599
 600                 if (is_bool($stmt)) {
 601                         $retval = $stmt;
 602                 } else {
 603                         $retval = self::fetch($stmt);
 604                 }
 605
 606                 self::close($stmt);
 607
 608                 return $retval;
 609         }
 610
 611         /**
 612          * @brief Returns the number of affected rows of the last statement
 613          *
 614          * @return int Number of rows
 615          */
 616         public static function affected_rows() {
 617                 return self::$affected_rows;
 618         }
 619
 620         /**
 621          * @brief Returns the number of columns of a statement
 622          *
 623          * @param object Statement object
 624          * @return int Number of columns
 625          */
 626         public static function columnCount($stmt) {
 627                 if (!is_object($stmt)) {
 628                         return 0;
 629                 }
 630                 switch (self::$driver) {
 631                         case 'pdo':
 632                                 return $stmt->columnCount();
 633                         case 'mysqli':
 634                                 return $stmt->field_count;
 635                 }
 636                 return 0;
 637         }
 638         /**
 639          * @brief Returns the number of rows of a statement
 640          *
 641          * @param object Statement object
 642          * @return int Number of rows
 643          */
 644         public static function num_rows($stmt) {
 645                 if (!is_object($stmt)) {
 646                         return 0;
 647                 }
 648                 switch (self::$driver) {
 649                         case 'pdo':
 650                                 return $stmt->rowCount();
 651                         case 'mysqli':
 652                                 return $stmt->num_rows;
 653                 }
 654                 return 0;
 655         }
 656
 657         /**
 658          * @brief Fetch a single row
 659          *
 660          * @param object $stmt statement object
 661          * @return array current row
 662          */
 663         public static function fetch($stmt) {
 664                 if (!is_object($stmt)) {
 665                         return false;
 666                 }
 667
 668                 switch (self::$driver) {
 669                         case 'pdo':
 670                                 return $stmt->fetch(PDO::FETCH_ASSOC);
 671                         case 'mysqli':
 672                                 if (get_class($stmt) == 'mysqli_result') {
 673                                         return $stmt->fetch_assoc();
 674                                 }
 675
 676                                 // This code works, but is slow
 677
 678                                 // Bind the result to a result array
 679                                 $cols = array();
 680
 681                                 $cols_num = array();
 682                                 for ($x = 0; $x < $stmt->field_count; $x++) {
 683                                         $cols[] = &$cols_num[$x];
 684                                 }
 685
 686                                 call_user_func_array(array($stmt, 'bind_result'), $cols);
 687
 688                                 if (!$stmt->fetch()) {
 689                                         return false;
 690                                 }
 691
 692                                 // The slow part:
 693                                 // We need to get the field names for the array keys
 694                                 // It seems that there is no better way to do this.
 695                                 $result = $stmt->result_metadata();
 696                                 $fields = $result->fetch_fields();
 697
 698                                 $columns = array();
 699                                 foreach ($cols_num AS $param => $col) {
 700                                         $columns[$fields[$param]->name] = $col;
 701                                 }
 702                                 return $columns;
 703                 }
 704         }
 705
 706         /**
 707          * @brief Insert a row into a table
 708          *
 709          * @param string $table Table name
 710          * @param array $param parameter array
 711          * @param bool $on_duplicate_update Do an update on a duplicate entry
 712          *
 713          * @return boolean was the insert successfull?
 714          */
 715         public static function insert($table, $param, $on_duplicate_update = false) {
 716                 $sql = "INSERT INTO `".self::escape($table)."` (`".implode("`, `", array_keys($param))."`) VALUES (".
 717                         substr(str_repeat("?, ", count($param)), 0, -2).")";
 718
 719                 if ($on_duplicate_update) {
 720                         $sql .= " ON DUPLICATE KEY UPDATE `".implode("` = ?, `", array_keys($param))."` = ?";
 721
 722                         $values = array_values($param);
 723                         $param = array_merge_recursive($values, $values);
 724                 }
 725
 726                 return self::e($sql, $param);
 727         }
 728
 729         /**
 730          * @brief Fetch the id of the last insert command
 731          *
 732          * @return integer Last inserted id
 733          */
 734         public static function lastInsertId() {
 735                 switch (self::$driver) {
 736                         case 'pdo':
 737                                 $id = self::$db->lastInsertId();
 738                                 break;
 739                         case 'mysqli':
 740                                 $id = self::$db->insert_id;
 741                                 break;
 742                 }
 743                 return $id;
 744         }
 745
 746         /**
 747          * @brief Locks a table for exclusive write access
 748          *
 749          * This function can be extended in the future to accept a table array as well.
 750          *
 751          * @param string $table Table name
 752          *
 753          * @return boolean was the lock successful?
 754          */
 755         public static function lock($table) {
 756                 // See here: https://dev.mysql.com/doc/refman/5.7/en/lock-tables-and-transactions.html
 757                 self::e("SET autocommit=0");
 758                 $success = self::e("LOCK TABLES `".self::escape($table)."` WRITE");
 759                 if (!$success) {
 760                         self::e("SET autocommit=1");
 761                 } else {
 762                         self::$in_transaction = true;
 763                 }
 764                 return $success;
 765         }
 766
 767         /**
 768          * @brief Unlocks all locked tables
 769          *
 770          * @return boolean was the unlock successful?
 771          */
 772         public static function unlock() {
 773                 // See here: https://dev.mysql.com/doc/refman/5.7/en/lock-tables-and-transactions.html
 774                 self::e("COMMIT");
 775                 $success = self::e("UNLOCK TABLES");
 776                 self::e("SET autocommit=1");
 777                 self::$in_transaction = false;
 778                 return $success;
 779         }
 780
 781         /**
 782          * @brief Starts a transaction
 783          *
 784          * @return boolean Was the command executed successfully?
 785          */
 786         public static function transaction() {
 787                 if (!self::e('COMMIT')) {
 788                         return false;
 789                 }
 790                 if (!self::e('START TRANSACTION')) {
 791                         return false;
 792                 }
 793                 self::$in_transaction = true;
 794                 return true;
 795         }
 796
 797         /**
 798          * @brief Does a commit
 799          *
 800          * @return boolean Was the command executed successfully?
 801          */
 802         public static function commit() {
 803                 if (!self::e('COMMIT')) {
 804                         return false;
 805                 }
 806                 self::$in_transaction = false;
 807                 return true;
 808         }
 809
 810         /**
 811          * @brief Does a rollback
 812          *
 813          * @return boolean Was the command executed successfully?
 814          */
 815         public static function rollback() {
 816                 if (!self::e('ROLLBACK')) {
 817                         return false;
 818                 }
 819                 self::$in_transaction = false;
 820                 return true;
 821         }
 822
 823         /**
 824          * @brief Build the array with the table relations
 825          *
 826          * The array is build from the database definitions in dbstructure.php
 827          *
 828          * This process must only be started once, since the value is cached.
 829          */
 830         private static function build_relation_data() {
 831                 $definition = db_definition();
 832
 833                 foreach ($definition AS $table => $structure) {
 834                         foreach ($structure['fields'] AS $field => $field_struct) {
 835                                 if (isset($field_struct['relation'])) {
 836                                         foreach ($field_struct['relation'] AS $rel_table => $rel_field) {
 837                                                 self::$relation[$rel_table][$rel_field][$table][] = $field;
 838                                         }
 839                                 }
 840                         }
 841                 }
 842         }
 843
 844         /**
 845          * @brief Delete a row from a table
 846          *
 847          * @param string $table Table name
 848          * @param array $param parameter array
 849          * @param boolean $in_process Internal use: Only do a commit after the last delete
 850          * @param array $callstack Internal use: prevent endless loops
 851          *
 852          * @return boolean|array was the delete successfull? When $in_process is set: deletion data
 853          */
 854         public static function delete($table, $param, $in_process = false, &$callstack = array()) {
 855                 $commands = array();
 856
 857                 // Create a key for the loop prevention
 858                 $key = $table.':'.implode(':', array_keys($param)).':'.implode(':', $param);
 859
 860                 // We quit when this key already exists in the callstack.
 861                 if (isset($callstack[$key])) {
 862                         return $commands;
 863                 }
 864
 865                 $callstack[$key] = true;
 866
 867                 $table = self::escape($table);
 868
 869                 $commands[$key] = array('table' => $table, 'param' => $param);
 870
 871                 // To speed up the whole process we cache the table relations
 872                 if (count(self::$relation) == 0) {
 873                         self::build_relation_data();
 874                 }
 875
 876                 // Is there a relation entry for the table?
 877                 if (isset(self::$relation[$table])) {
 878                         // We only allow a simple "one field" relation.
 879                         $field = array_keys(self::$relation[$table])[0];
 880                         $rel_def = array_values(self::$relation[$table])[0];
 881
 882                         // Create a key for preventing double queries
 883                         $qkey = $field.'-'.$table.':'.implode(':', array_keys($param)).':'.implode(':', $param);
 884
 885                         // When the search field is the relation field, we don't need to fetch the rows
 886                         // This is useful when the leading record is already deleted in the frontend but the rest is done in the backend
 887                         if ((count($param) == 1) && ($field == array_keys($param)[0])) {
 888                                 foreach ($rel_def AS $rel_table => $rel_fields) {
 889                                         foreach ($rel_fields AS $rel_field) {
 890                                                 $retval = self::delete($rel_table, array($rel_field => array_values($param)[0]), true, $callstack);
 891                                                 $commands = array_merge($commands, $retval);
 892                                         }
 893                                 }
 894                         // We quit when this key already exists in the callstack.
 895                         } elseif (!isset($callstack[$qkey])) {
 896
 897                                 $callstack[$qkey] = true;
 898
 899                                 // Fetch all rows that are to be deleted
 900                                 $data = self::select($table, array($field), $param);
 901
 902                                 while ($row = self::fetch($data)) {
 903                                         // Now we accumulate the delete commands
 904                                         $retval = self::delete($table, array($field => $row[$field]), true, $callstack);
 905                                         $commands = array_merge($commands, $retval);
 906                                 }
 907
 908                                 self::close($data);
 909
 910                                 // Since we had split the delete command we don't need the original command anymore
 911                                 unset($commands[$key]);
 912                         }
 913                 }
 914
 915                 if (!$in_process) {
 916                         // Now we finalize the process
 917                         $do_transaction = !self::$in_transaction;
 918
 919                         if ($do_transaction) {
 920                                 self::transaction();
 921                         }
 922
 923                         $compacted = array();
 924                         $counter = array();
 925
 926                         foreach ($commands AS $command) {
 927                                 $condition = $command['param'];
 928                                 $array_element = each($condition);
 929                                 $array_key = $array_element['key'];
 930                                 if (is_int($array_key)) {
 931                                         $condition_string = " WHERE ".array_shift($condition);
 932                                 } else {
 933                                         $condition_string = " WHERE `".implode("` = ? AND `", array_keys($condition))."` = ?";
 934                                 }
 935
 936                                 if ((count($command['param']) > 1) || is_int($array_key)) {
 937                                         $sql = "DELETE FROM `".$command['table']."`".$condition_string;
 938                                         logger(self::replace_parameters($sql, $condition), LOGGER_DATA);
 939
 940                                         if (!self::e($sql, $condition)) {
 941                                                 if ($do_transaction) {
 942                                                         self::rollback();
 943                                                 }
 944                                                 return false;
 945                                         }
 946                                 } else {
 947                                         $key_table = $command['table'];
 948                                         $key_param = array_keys($command['param'])[0];
 949                                         $value = array_values($command['param'])[0];
 950
 951                                         // Split the SQL queries in chunks of 100 values
 952                                         // We do the $i stuff here to make the code better readable
 953                                         $i = $counter[$key_table][$key_param];
 954                                         if (count($compacted[$key_table][$key_param][$i]) > 100) {
 955                                                 ++$i;
 956                                         }
 957
 958                                         $compacted[$key_table][$key_param][$i][$value] = $value;
 959                                         $counter[$key_table][$key_param] = $i;
 960                                 }
 961                         }
 962                         foreach ($compacted AS $table => $values) {
 963                                 foreach ($values AS $field => $field_value_list) {
 964                                         foreach ($field_value_list AS $field_values) {
 965                                                 $sql = "DELETE FROM `".$table."` WHERE `".$field."` IN (".
 966                                                         substr(str_repeat("?, ", count($field_values)), 0, -2).");";
 967
 968                                                 logger(self::replace_parameters($sql, $field_values), LOGGER_DATA);
 969
 970                                                 if (!self::e($sql, $field_values)) {
 971                                                         if ($do_transaction) {
 972                                                                 self::rollback();
 973                                                         }
 974                                                         return false;
 975                                                 }
 976                                         }
 977                                 }
 978                         }
 979                         if ($do_transaction) {
 980                                 self::commit();
 981                         }
 982                         return true;
 983                 }
 984
 985                 return $commands;
 986         }
 987
 988         /**
 989          * @brief Updates rows
 990          *
 991          * Updates rows in the database. When $old_fields is set to an array,
 992          * the system will only do an update if the fields in that array changed.
 993          *
 994          * Attention:
 995          * Only the values in $old_fields are compared.
 996          * This is an intentional behaviour.
 997          *
 998          * Example:
 999          * We include the timestamp field in $fields but not in $old_fields.
1000          * Then the row will only get the new timestamp when the other fields had changed.
1001          *
1002          * When $old_fields is set to a boolean value the system will do this compare itself.
1003          * When $old_fields is set to "true" the system will do an insert if the row doesn't exists.
1004          *
1005          * Attention:
1006          * Only set $old_fields to a boolean value when you are sure that you will update a single row.
1007          * When you set $old_fields to "true" then $fields must contain all relevant fields!
1008          *
1009          * @param string $table Table name
1010          * @param array $fields contains the fields that are updated
1011          * @param array $condition condition array with the key values
1012          * @param array|boolean $old_fields array with the old field values that are about to be replaced (true = update on duplicate)
1013          *
1014          * @return boolean was the update successfull?
1015          */
1016         public static function update($table, $fields, $condition, $old_fields = array()) {
1017                 $table = self::escape($table);
1018
1019                 $array_element = each($condition);
1020                 $array_key = $array_element['key'];
1021                 if (is_int($array_key)) {
1022                         $condition_string = " WHERE ".array_shift($condition);
1023                 } else {
1024                         $condition_string = " WHERE `".implode("` = ? AND `", array_keys($condition))."` = ?";
1025                 }
1026
1027                 if (is_bool($old_fields)) {
1028                         $do_insert = $old_fields;
1029
1030                         $old_fields = self::select($table, array(), $condition, array('limit' => 1));
1031
1032                         if (is_bool($old_fields)) {
1033                                 if ($do_insert) {
1034                                         $values = array_merge($condition, $fields);
1035                                         return self::insert($table, $values, $do_insert);
1036                                 }
1037                                 $old_fields = array();
1038                         }
1039                 }
1040
1041                 $do_update = (count($old_fields) == 0);
1042
1043                 foreach ($old_fields AS $fieldname => $content) {
1044                         if (isset($fields[$fieldname])) {
1045                                 if ($fields[$fieldname] == $content) {
1046                                         unset($fields[$fieldname]);
1047                                 } else {
1048                                         $do_update = true;
1049                                 }
1050                         }
1051                 }
1052
1053                 if (!$do_update || (count($fields) == 0)) {
1054                         return true;
1055                 }
1056
1057                 $sql = "UPDATE `".$table."` SET `".
1058                         implode("` = ?, `", array_keys($fields))."` = ?".$condition_string;
1059
1060                 $params1 = array_values($fields);
1061                 $params2 = array_values($condition);
1062                 $params = array_merge_recursive($params1, $params2);
1063
1064                 return self::e($sql, $params);
1065         }
1066
1067         /**
1068          * @brief Select rows from a table
1069          *
1070          * @param string $table Table name
1071          * @param array $fields array of selected fields
1072          * @param array $condition array of fields for condition
1073          * @param array $params array of several parameters
1074          *
1075          * @return boolean|object If "limit" is equal "1" only a single row is returned, else a query object is returned
1076          *
1077          * Example:
1078          * $table = "item";
1079          * $fields = array("id", "uri", "uid", "network");
1080          *
1081          * $condition = array("uid" => 1, "network" => 'dspr');
1082          * or:
1083          * $condition = array("`uid` = ? AND `network` IN (?, ?)", 1, 'dfrn', 'dspr');
1084          *
1085          * $params = array("order" => array("id", "received" => true), "limit" => 1);
1086          *
1087          * $data = dba::select($table, $fields, $condition, $params);
1088          */
1089         public static function select($table, $fields = array(), $condition = array(), $params = array()) {
1090                 if ($table == '') {
1091                         return false;
1092                 }
1093
1094                 if (count($fields) > 0) {
1095                         $select_fields = "`".implode("`, `", array_values($fields))."`";
1096                 } else {
1097                         $select_fields = "*";
1098                 }
1099
1100                 if (count($condition) > 0) {
1101                         $array_element = each($condition);
1102                         $array_key = $array_element['key'];
1103                         if (is_int($array_key)) {
1104                                 $condition_string = " WHERE ".array_shift($condition);
1105                         } else {
1106                                 $condition_string = " WHERE `".implode("` = ? AND `", array_keys($condition))."` = ?";
1107                         }
1108                 } else {
1109                         $condition_string = "";
1110                 }
1111
1112                 $param_string = '';
1113                 $single_row = false;
1114
1115                 if (isset($params['order'])) {
1116                         $param_string .= " ORDER BY ";
1117                         foreach ($params['order'] AS $fields => $order) {
1118                                 if (!is_int($fields)) {
1119                                         $param_string .= "`".$fields."` ".($order ? "DESC" : "ASC").", ";
1120                                 } else {
1121                                         $param_string .= "`".$order."`, ";
1122                                 }
1123                         }
1124                         $param_string = substr($param_string, 0, -2);
1125                 }
1126
1127                 if (isset($params['limit']) && is_int($params['limit'])) {
1128                         $param_string .= " LIMIT ".$params['limit'];
1129                         $single_row = ($params['limit'] == 1);
1130                 }
1131
1132                 if (isset($params['only_query']) && $params['only_query']) {
1133                         $single_row = !$params['only_query'];
1134                 }
1135
1136                 $sql = "SELECT ".$select_fields." FROM `".$table."`".$condition_string.$param_string;
1137
1138                 $result = self::p($sql, $condition);
1139
1140                 if (is_bool($result) || !$single_row) {
1141                         return $result;
1142                 } else {
1143                         $row = self::fetch($result);
1144                         self::close($result);
1145                         return $row;
1146                 }
1147         }
1148
1149
1150         /**
1151          * @brief Fills an array with data from a query
1152          *
1153          * @param object $stmt statement object
1154          * @return array Data array
1155          */
1156         public static function inArray($stmt, $do_close = true) {
1157                 if (is_bool($stmt)) {
1158                         return $stmt;
1159                 }
1160
1161                 $data = array();
1162                 while ($row = self::fetch($stmt)) {
1163                         $data[] = $row;
1164                 }
1165                 if ($do_close) {
1166                         self::close($stmt);
1167                 }
1168                 return $data;
1169         }
1170
1171         /**
1172          * @brief Returns the error number of the last query
1173          *
1174          * @return string Error number (0 if no error)
1175          */
1176         public static function errorNo() {
1177                 return self::$errorno;
1178         }
1179
1180         /**
1181          * @brief Returns the error message of the last query
1182          *
1183          * @return string Error message ('' if no error)
1184          */
1185         public static function errorMessage() {
1186                 return self::$error;
1187         }
1188
1189         /**
1190          * @brief Closes the current statement
1191          *
1192          * @param object $stmt statement object
1193          * @return boolean was the close successfull?
1194          */
1195         public static function close($stmt) {
1196                 if (!is_object($stmt)) {
1197                         return false;
1198                 }
1199
1200                 switch (self::$driver) {
1201                         case 'pdo':
1202                                 return $stmt->closeCursor();
1203                         case 'mysqli':
1204                                 $stmt->free_result();
1205                                 return $stmt->close();
1206                 }
1207         }
1208 }
1209
1210 function dbesc($str) {
1211         if (dba::$connected) {
1212                 return(dba::escape($str));
1213         } else {
1214                 return(str_replace("'","\\'",$str));
1215         }
1216 }
1217
1218 /**
1219  * @brief execute SQL query with printf style args - deprecated
1220  *
1221  * Please use the dba:: functions instead:
1222  * dba::select, dba::exists, dba::insert
1223  * dba::delete, dba::update, dba::p, dba::e
1224  *
1225  * @param $args Query parameters (1 to N parameters of different types)
1226  * @return array Query array
1227  */
1228 function q($sql) {
1229         $args = func_get_args();
1230         unset($args[0]);
1231
1232         if (!dba::$connected) {
1233                 return false;
1234         }
1235
1236         $sql = dba::clean_query($sql);
1237         $sql = dba::any_value_fallback($sql);
1238
1239         $stmt = @vsprintf($sql, $args);
1240
1241         $ret = dba::p($stmt);
1242
1243         if (is_bool($ret)) {
1244                 return $ret;
1245         }
1246
1247         $columns = dba::columnCount($ret);
1248
1249         $data = dba::inArray($ret);
1250
1251         if ((count($data) == 0) && ($columns == 0)) {
1252                 return true;
1253         }
1254
1255         return $data;
1256 }
1257
1258 function dba_timer() {
1259         return microtime(true);
1260 }