include/dba.php

   1 <?php
   2
   3 use Friendica\App;
   4 use Friendica\Core\L10n;
   5 use Friendica\Core\System;
   6 use Friendica\Database\DBM;
   7 use Friendica\Database\DBStructure;
   8 use Friendica\Util\DateTimeFormat;
   9
  10 /**
  11  * @class MySQL database class
  12  *
  13  * This class is for the low level database stuff that does driver specific things.
  14  */
  15
  16 class dba {
  17         public static $connected = false;
  18
  19         private static $_server_info = '';
  20         private static $db;
  21         private static $driver;
  22         private static $error = false;
  23         private static $errorno = 0;
  24         private static $affected_rows = 0;
  25         private static $in_transaction = false;
  26         private static $in_retrial = false;
  27         private static $relation = [];
  28         private static $db_serveraddr = '';
  29         private static $db_user = '';
  30         private static $db_pass = '';
  31         private static $db_name = '';
  32
  33         public static function connect($serveraddr, $user, $pass, $db) {
  34                 if (!is_null(self::$db) && self::connected()) {
  35                         return true;
  36                 }
  37
  38                 $a = get_app();
  39
  40                 $stamp1 = microtime(true);
  41
  42                 // We are storing these values for being able to perform a reconnect
  43                 self::$db_serveraddr = $serveraddr;
  44                 self::$db_user = $user;
  45                 self::$db_pass = $pass;
  46                 self::$db_name = $db;
  47
  48                 $serveraddr = trim($serveraddr);
  49
  50                 $serverdata = explode(':', $serveraddr);
  51                 $server = $serverdata[0];
  52
  53                 if (count($serverdata) > 1) {
  54                         $port = trim($serverdata[1]);
  55                 }
  56
  57                 $server = trim($server);
  58                 $user = trim($user);
  59                 $pass = trim($pass);
  60                 $db = trim($db);
  61
  62                 if (!(strlen($server) && strlen($user))) {
  63                         return false;
  64                 }
  65
  66                 if (class_exists('\PDO') && in_array('mysql', PDO::getAvailableDrivers())) {
  67                         self::$driver = 'pdo';
  68                         $connect = "mysql:host=".$server.";dbname=".$db;
  69
  70                         if (isset($port)) {
  71                                 $connect .= ";port=".$port;
  72                         }
  73
  74                         if (isset($a->config["system"]["db_charset"])) {
  75                                 $connect .= ";charset=".$a->config["system"]["db_charset"];
  76                         }
  77                         try {
  78                                 self::$db = @new PDO($connect, $user, $pass);
  79                                 self::$db->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
  80                                 self::$db->setAttribute(PDO::ATTR_STRINGIFY_FETCHES, false);
  81                                 self::$connected = true;
  82                         } catch (PDOException $e) {
  83                         }
  84                 }
  85
  86                 if (!self::$connected && class_exists('mysqli')) {
  87                         self::$driver = 'mysqli';
  88                         self::$db = @new mysqli($server, $user, $pass, $db, $port);
  89                         if (!mysqli_connect_errno()) {
  90                                 self::$connected = true;
  91
  92                                 if (isset($a->config["system"]["db_charset"])) {
  93                                         self::$db->set_charset($a->config["system"]["db_charset"]);
  94                                 }
  95                         }
  96                 }
  97
  98                 // No suitable SQL driver was found.
  99                 if (!self::$connected) {
 100                         self::$driver = null;
 101                         self::$db = null;
 102                 }
 103                 $a->save_timestamp($stamp1, "network");
 104
 105                 return self::$connected;
 106         }
 107
 108         /**
 109          * Disconnects the current database connection
 110          */
 111         public static function disconnect()
 112         {
 113                 if (is_null(self::$db)) {
 114                         return;
 115                 }
 116
 117                 switch (self::$driver) {
 118                         case 'pdo':
 119                                 self::$db = null;
 120                                 break;
 121                         case 'mysqli':
 122                                 self::$db->close();
 123                                 self::$db = null;
 124                                 break;
 125                 }
 126         }
 127
 128         /**
 129          * Perform a reconnect of an existing database connection
 130          */
 131         public static function reconnect() {
 132                 self::disconnect();
 133
 134                 $ret = self::connect(self::$db_serveraddr, self::$db_user, self::$db_pass, self::$db_name);
 135                 return $ret;
 136         }
 137
 138         /**
 139          * Return the database object.
 140          * @return PDO|mysqli
 141          */
 142         public static function get_db()
 143         {
 144                 return self::$db;
 145         }
 146
 147         /**
 148          * @brief Returns the MySQL server version string
 149          *
 150          * This function discriminate between the deprecated mysql API and the current
 151          * object-oriented mysqli API. Example of returned string: 5.5.46-0+deb8u1
 152          *
 153          * @return string
 154          */
 155         public static function server_info() {
 156                 if (self::$_server_info == '') {
 157                         switch (self::$driver) {
 158                                 case 'pdo':
 159                                         self::$_server_info = self::$db->getAttribute(PDO::ATTR_SERVER_VERSION);
 160                                         break;
 161                                 case 'mysqli':
 162                                         self::$_server_info = self::$db->server_info;
 163                                         break;
 164                         }
 165                 }
 166                 return self::$_server_info;
 167         }
 168
 169         /**
 170          * @brief Returns the selected database name
 171          *
 172          * @return string
 173          */
 174         public static function database_name() {
 175                 $ret = self::p("SELECT DATABASE() AS `db`");
 176                 $data = self::inArray($ret);
 177                 return $data[0]['db'];
 178         }
 179
 180         /**
 181          * @brief Analyze a database query and log this if some conditions are met.
 182          *
 183          * @param string $query The database query that will be analyzed
 184          */
 185         private static function logIndex($query) {
 186                 $a = get_app();
 187
 188                 if (empty($a->config["system"]["db_log_index"])) {
 189                         return;
 190                 }
 191
 192                 // Don't explain an explain statement
 193                 if (strtolower(substr($query, 0, 7)) == "explain") {
 194                         return;
 195                 }
 196
 197                 // Only do the explain on "select", "update" and "delete"
 198                 if (!in_array(strtolower(substr($query, 0, 6)), ["select", "update", "delete"])) {
 199                         return;
 200                 }
 201
 202                 $r = self::p("EXPLAIN ".$query);
 203                 if (!DBM::is_result($r)) {
 204                         return;
 205                 }
 206
 207                 $watchlist = explode(',', $a->config["system"]["db_log_index_watch"]);
 208                 $blacklist = explode(',', $a->config["system"]["db_log_index_blacklist"]);
 209
 210                 while ($row = dba::fetch($r)) {
 211                         if ((intval($a->config["system"]["db_loglimit_index"]) > 0)) {
 212                                 $log = (in_array($row['key'], $watchlist) &&
 213                                         ($row['rows'] >= intval($a->config["system"]["db_loglimit_index"])));
 214                         } else {
 215                                 $log = false;
 216                         }
 217
 218                         if ((intval($a->config["system"]["db_loglimit_index_high"]) > 0) && ($row['rows'] >= intval($a->config["system"]["db_loglimit_index_high"]))) {
 219                                 $log = true;
 220                         }
 221
 222                         if (in_array($row['key'], $blacklist) || ($row['key'] == "")) {
 223                                 $log = false;
 224                         }
 225
 226                         if ($log) {
 227                                 $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
 228                                 @file_put_contents($a->config["system"]["db_log_index"], DateTimeFormat::utcNow()."\t".
 229                                                 $row['key']."\t".$row['rows']."\t".$row['Extra']."\t".
 230                                                 basename($backtrace[1]["file"])."\t".
 231                                                 $backtrace[1]["line"]."\t".$backtrace[2]["function"]."\t".
 232                                                 substr($query, 0, 2000)."\n", FILE_APPEND);
 233                         }
 234                 }
 235         }
 236
 237         public static function escape($str) {
 238                 switch (self::$driver) {
 239                         case 'pdo':
 240                                 return substr(@self::$db->quote($str, PDO::PARAM_STR), 1, -1);
 241                         case 'mysqli':
 242                                 return @self::$db->real_escape_string($str);
 243                 }
 244         }
 245
 246         public static function connected() {
 247                 $connected = false;
 248
 249                 switch (self::$driver) {
 250                         case 'pdo':
 251                                 $r = dba::p("SELECT 1");
 252                                 if (DBM::is_result($r)) {
 253                                         $row = dba::inArray($r);
 254                                         $connected = ($row[0]['1'] == '1');
 255                                 }
 256                                 break;
 257                         case 'mysqli':
 258                                 $connected = self::$db->ping();
 259                                 break;
 260                 }
 261                 return $connected;
 262         }
 263
 264         /**
 265          * @brief Replaces ANY_VALUE() function by MIN() function,
 266          *  if the database server does not support ANY_VALUE().
 267          *
 268          * Considerations for Standard SQL, or MySQL with ONLY_FULL_GROUP_BY (default since 5.7.5).
 269          * ANY_VALUE() is available from MySQL 5.7.5 https://dev.mysql.com/doc/refman/5.7/en/miscellaneous-functions.html
 270          * A standard fall-back is to use MIN().
 271          *
 272          * @param string $sql An SQL string without the values
 273          * @return string The input SQL string modified if necessary.
 274          */
 275         public static function any_value_fallback($sql) {
 276                 $server_info = self::server_info();
 277                 if (version_compare($server_info, '5.7.5', '<') ||
 278                         (stripos($server_info, 'MariaDB') !== false)) {
 279                         $sql = str_ireplace('ANY_VALUE(', 'MIN(', $sql);
 280                 }
 281                 return $sql;
 282         }
 283
 284         /**
 285          * @brief beautifies the query - useful for "SHOW PROCESSLIST"
 286          *
 287          * This is safe when we bind the parameters later.
 288          * The parameter values aren't part of the SQL.
 289          *
 290          * @param string $sql An SQL string without the values
 291          * @return string The input SQL string modified if necessary.
 292          */
 293         public static function clean_query($sql) {
 294                 $search = ["\t", "\n", "\r", "  "];
 295                 $replace = [' ', ' ', ' ', ' '];
 296                 do {
 297                         $oldsql = $sql;
 298                         $sql = str_replace($search, $replace, $sql);
 299                 } while ($oldsql != $sql);
 300
 301                 return $sql;
 302         }
 303
 304
 305         /**
 306          * @brief Replaces the ? placeholders with the parameters in the $args array
 307          *
 308          * @param string $sql SQL query
 309          * @param array $args The parameters that are to replace the ? placeholders
 310          * @return string The replaced SQL query
 311          */
 312         private static function replaceParameters($sql, $args) {
 313                 $offset = 0;
 314                 foreach ($args AS $param => $value) {
 315                         if (is_int($args[$param]) || is_float($args[$param])) {
 316                                 $replace = intval($args[$param]);
 317                         } else {
 318                                 $replace = "'".self::escape($args[$param])."'";
 319                         }
 320
 321                         $pos = strpos($sql, '?', $offset);
 322                         if ($pos !== false) {
 323                                 $sql = substr_replace($sql, $replace, $pos, 1);
 324                         }
 325                         $offset = $pos + strlen($replace);
 326                 }
 327                 return $sql;
 328         }
 329
 330         /**
 331          * @brief Convert parameter array to an universal form
 332          * @param array $args Parameter array
 333          * @return array universalized parameter array
 334          */
 335         private static function getParam($args) {
 336                 unset($args[0]);
 337
 338                 // When the second function parameter is an array then use this as the parameter array
 339                 if ((count($args) > 0) && (is_array($args[1]))) {
 340                         return $args[1];
 341                 } else {
 342                         return $args;
 343                 }
 344         }
 345
 346         /**
 347          * @brief Executes a prepared statement that returns data
 348          * @usage Example: $r = p("SELECT * FROM `item` WHERE `guid` = ?", $guid);
 349          *
 350          * Please only use it with complicated queries.
 351          * For all regular queries please use dba::select or dba::exists
 352          *
 353          * @param string $sql SQL statement
 354          * @return bool|object statement object
 355          */
 356         public static function p($sql) {
 357                 $a = get_app();
 358
 359                 $stamp1 = microtime(true);
 360
 361                 $params = self::getParam(func_get_args());
 362
 363                 // Renumber the array keys to be sure that they fit
 364                 $i = 0;
 365                 $args = [];
 366                 foreach ($params AS $param) {
 367                         // Avoid problems with some MySQL servers and boolean values. See issue #3645
 368                         if (is_bool($param)) {
 369                                 $param = (int)$param;
 370                         }
 371                         $args[++$i] = $param;
 372                 }
 373
 374                 if (!self::$connected) {
 375                         return false;
 376                 }
 377
 378                 if ((substr_count($sql, '?') != count($args)) && (count($args) > 0)) {
 379                         // Question: Should we continue or stop the query here?
 380                         logger('Parameter mismatch. Query "'.$sql.'" - Parameters '.print_r($args, true), LOGGER_DEBUG);
 381                 }
 382
 383                 $sql = self::clean_query($sql);
 384                 $sql = self::any_value_fallback($sql);
 385
 386                 $orig_sql = $sql;
 387
 388                 if (x($a->config,'system') && x($a->config['system'], 'db_callstack')) {
 389                         $sql = "/*".System::callstack()." */ ".$sql;
 390                 }
 391
 392                 self::$error = '';
 393                 self::$errorno = 0;
 394                 self::$affected_rows = 0;
 395
 396                 // We have to make some things different if this function is called from "e"
 397                 $trace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 2);
 398
 399                 if (isset($trace[1])) {
 400                         $called_from = $trace[1];
 401                 } else {
 402                         // We use just something that is defined to avoid warnings
 403                         $called_from = $trace[0];
 404                 }
 405                 // We are having an own error logging in the function "e"
 406                 $called_from_e = ($called_from['function'] == 'e');
 407
 408                 switch (self::$driver) {
 409                         case 'pdo':
 410                                 // If there are no arguments we use "query"
 411                                 if (count($args) == 0) {
 412                                         if (!$retval = self::$db->query($sql)) {
 413                                                 $errorInfo = self::$db->errorInfo();
 414                                                 self::$error = $errorInfo[2];
 415                                                 self::$errorno = $errorInfo[1];
 416                                                 $retval = false;
 417                                                 break;
 418                                         }
 419                                         self::$affected_rows = $retval->rowCount();
 420                                         break;
 421                                 }
 422
 423                                 if (!$stmt = self::$db->prepare($sql)) {
 424                                         $errorInfo = self::$db->errorInfo();
 425                                         self::$error = $errorInfo[2];
 426                                         self::$errorno = $errorInfo[1];
 427                                         $retval = false;
 428                                         break;
 429                                 }
 430
 431                                 foreach ($args AS $param => $value) {
 432                                         if (is_int($args[$param])) {
 433                                                 $data_type = PDO::PARAM_INT;
 434                                         } else {
 435                                                 $data_type = PDO::PARAM_STR;
 436                                         }
 437                                         $stmt->bindParam($param, $args[$param], $data_type);
 438                                 }
 439
 440                                 if (!$stmt->execute()) {
 441                                         $errorInfo = $stmt->errorInfo();
 442                                         self::$error = $errorInfo[2];
 443                                         self::$errorno = $errorInfo[1];
 444                                         $retval = false;
 445                                 } else {
 446                                         $retval = $stmt;
 447                                         self::$affected_rows = $retval->rowCount();
 448                                 }
 449                                 break;
 450                         case 'mysqli':
 451                                 // There are SQL statements that cannot be executed with a prepared statement
 452                                 $parts = explode(' ', $orig_sql);
 453                                 $command = strtolower($parts[0]);
 454                                 $can_be_prepared = in_array($command, ['select', 'update', 'insert', 'delete']);
 455
 456                                 // The fallback routine is called as well when there are no arguments
 457                                 if (!$can_be_prepared || (count($args) == 0)) {
 458                                         $retval = self::$db->query(self::replaceParameters($sql, $args));
 459                                         if (self::$db->errno) {
 460                                                 self::$error = self::$db->error;
 461                                                 self::$errorno = self::$db->errno;
 462                                                 $retval = false;
 463                                         } else {
 464                                                 if (isset($retval->num_rows)) {
 465                                                         self::$affected_rows = $retval->num_rows;
 466                                                 } else {
 467                                                         self::$affected_rows = self::$db->affected_rows;
 468                                                 }
 469                                         }
 470                                         break;
 471                                 }
 472
 473                                 $stmt = self::$db->stmt_init();
 474
 475                                 if (!$stmt->prepare($sql)) {
 476                                         self::$error = $stmt->error;
 477                                         self::$errorno = $stmt->errno;
 478                                         $retval = false;
 479                                         break;
 480                                 }
 481
 482                                 $param_types = '';
 483                                 $values = [];
 484                                 foreach ($args AS $param => $value) {
 485                                         if (is_int($args[$param])) {
 486                                                 $param_types .= 'i';
 487                                         } elseif (is_float($args[$param])) {
 488                                                 $param_types .= 'd';
 489                                         } elseif (is_string($args[$param])) {
 490                                                 $param_types .= 's';
 491                                         } else {
 492                                                 $param_types .= 'b';
 493                                         }
 494                                         $values[] = &$args[$param];
 495                                 }
 496
 497                                 if (count($values) > 0) {
 498                                         array_unshift($values, $param_types);
 499                                         call_user_func_array([$stmt, 'bind_param'], $values);
 500                                 }
 501
 502                                 if (!$stmt->execute()) {
 503                                         self::$error = self::$db->error;
 504                                         self::$errorno = self::$db->errno;
 505                                         $retval = false;
 506                                 } else {
 507                                         $stmt->store_result();
 508                                         $retval = $stmt;
 509                                         self::$affected_rows = $retval->affected_rows;
 510                                 }
 511                                 break;
 512                 }
 513
 514                 // We are having an own error logging in the function "e"
 515                 if ((self::$errorno != 0) && !$called_from_e) {
 516                         // We have to preserve the error code, somewhere in the logging it get lost
 517                         $error = self::$error;
 518                         $errorno = self::$errorno;
 519
 520                         logger('DB Error '.self::$errorno.': '.self::$error."\n".
 521                                 System::callstack(8)."\n".self::replaceParameters($sql, $args));
 522
 523                         // On a lost connection we try to reconnect - but only once.
 524                         if ($errorno == 2006) {
 525                                 if (self::$in_retrial || !self::reconnect()) {
 526                                         // It doesn't make sense to continue when the database connection was lost
 527                                         if (self::$in_retrial) {
 528                                                 logger('Giving up retrial because of database error '.$errorno.': '.$error);
 529                                         } else {
 530                                                 logger("Couldn't reconnect after database error ".$errorno.': '.$error);
 531                                         }
 532                                         exit(1);
 533                                 } else {
 534                                         // We try it again
 535                                         logger('Reconnected after database error '.$errorno.': '.$error);
 536                                         self::$in_retrial = true;
 537                                         $ret = self::p($sql, $args);
 538                                         self::$in_retrial = false;
 539                                         return $ret;
 540                                 }
 541                         }
 542
 543                         self::$error = $error;
 544                         self::$errorno = $errorno;
 545                 }
 546
 547                 $a->save_timestamp($stamp1, 'database');
 548
 549                 if (x($a->config,'system') && x($a->config['system'], 'db_log')) {
 550
 551                         $stamp2 = microtime(true);
 552                         $duration = (float)($stamp2 - $stamp1);
 553
 554                         if (($duration > $a->config["system"]["db_loglimit"])) {
 555                                 $duration = round($duration, 3);
 556                                 $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
 557
 558                                 @file_put_contents($a->config["system"]["db_log"], DateTimeFormat::utcNow()."\t".$duration."\t".
 559                                                 basename($backtrace[1]["file"])."\t".
 560                                                 $backtrace[1]["line"]."\t".$backtrace[2]["function"]."\t".
 561                                                 substr(self::replaceParameters($sql, $args), 0, 2000)."\n", FILE_APPEND);
 562                         }
 563                 }
 564                 return $retval;
 565         }
 566
 567         /**
 568          * @brief Executes a prepared statement like UPDATE or INSERT that doesn't return data
 569          *
 570          * Please use dba::delete, dba::insert, dba::update, ... instead
 571          *
 572          * @param string $sql SQL statement
 573          * @return boolean Was the query successfull? False is returned only if an error occurred
 574          */
 575         public static function e($sql) {
 576                 $a = get_app();
 577
 578                 $stamp = microtime(true);
 579
 580                 $params = self::getParam(func_get_args());
 581
 582                 // In a case of a deadlock we are repeating the query 20 times
 583                 $timeout = 20;
 584
 585                 do {
 586                         $stmt = self::p($sql, $params);
 587
 588                         if (is_bool($stmt)) {
 589                                 $retval = $stmt;
 590                         } elseif (is_object($stmt)) {
 591                                 $retval = true;
 592                         } else {
 593                                 $retval = false;
 594                         }
 595
 596                         self::close($stmt);
 597
 598                 } while ((self::$errorno == 1213) && (--$timeout > 0));
 599
 600                 if (self::$errorno != 0) {
 601                         // We have to preserve the error code, somewhere in the logging it get lost
 602                         $error = self::$error;
 603                         $errorno = self::$errorno;
 604
 605                         logger('DB Error '.self::$errorno.': '.self::$error."\n".
 606                                 System::callstack(8)."\n".self::replaceParameters($sql, $params));
 607
 608                         // On a lost connection we simply quit.
 609                         // A reconnect like in self::p could be dangerous with modifications
 610                         if ($errorno == 2006) {
 611                                 logger('Giving up because of database error '.$errorno.': '.$error);
 612                                 exit(1);
 613                         }
 614
 615                         self::$error = $error;
 616                         self::$errorno = $errorno;
 617                 }
 618
 619                 $a->save_timestamp($stamp, "database_write");
 620
 621                 return $retval;
 622         }
 623
 624         /**
 625          * @brief Check if data exists
 626          *
 627          * @param string $table Table name
 628          * @param array $condition array of fields for condition
 629          *
 630          * @return boolean Are there rows for that condition?
 631          */
 632         public static function exists($table, $condition) {
 633                 if (empty($table)) {
 634                         return false;
 635                 }
 636
 637                 $fields = [];
 638
 639                 reset($condition);
 640                 $first_key = key($condition);
 641                 if (!is_int($first_key)) {
 642                         $fields = [$first_key];
 643                 }
 644
 645                 $stmt = self::select($table, $fields, $condition, ['limit' => 1]);
 646
 647                 if (is_bool($stmt)) {
 648                         $retval = $stmt;
 649                 } else {
 650                         $retval = (self::num_rows($stmt) > 0);
 651                 }
 652
 653                 self::close($stmt);
 654
 655                 return $retval;
 656         }
 657
 658         /**
 659          * Fetches the first row
 660          *
 661          * Please use dba::selectFirst or dba::exists whenever this is possible.
 662          *
 663          * @brief Fetches the first row
 664          * @param string $sql SQL statement
 665          * @return array first row of query
 666          */
 667         public static function fetch_first($sql) {
 668                 $params = self::getParam(func_get_args());
 669
 670                 $stmt = self::p($sql, $params);
 671
 672                 if (is_bool($stmt)) {
 673                         $retval = $stmt;
 674                 } else {
 675                         $retval = self::fetch($stmt);
 676                 }
 677
 678                 self::close($stmt);
 679
 680                 return $retval;
 681         }
 682
 683         /**
 684          * @brief Returns the number of affected rows of the last statement
 685          *
 686          * @return int Number of rows
 687          */
 688         public static function affected_rows() {
 689                 return self::$affected_rows;
 690         }
 691
 692         /**
 693          * @brief Returns the number of columns of a statement
 694          *
 695          * @param object Statement object
 696          * @return int Number of columns
 697          */
 698         public static function columnCount($stmt) {
 699                 if (!is_object($stmt)) {
 700                         return 0;
 701                 }
 702                 switch (self::$driver) {
 703                         case 'pdo':
 704                                 return $stmt->columnCount();
 705                         case 'mysqli':
 706                                 return $stmt->field_count;
 707                 }
 708                 return 0;
 709         }
 710         /**
 711          * @brief Returns the number of rows of a statement
 712          *
 713          * @param PDOStatement|mysqli_result|mysqli_stmt Statement object
 714          * @return int Number of rows
 715          */
 716         public static function num_rows($stmt) {
 717                 if (!is_object($stmt)) {
 718                         return 0;
 719                 }
 720                 switch (self::$driver) {
 721                         case 'pdo':
 722                                 return $stmt->rowCount();
 723                         case 'mysqli':
 724                                 return $stmt->num_rows;
 725                 }
 726                 return 0;
 727         }
 728
 729         /**
 730          * @brief Fetch a single row
 731          *
 732          * @param mixed $stmt statement object
 733          * @return array current row
 734          */
 735         public static function fetch($stmt) {
 736                 $a = get_app();
 737
 738                 $stamp1 = microtime(true);
 739
 740                 $columns = [];
 741
 742                 if (!is_object($stmt)) {
 743                         return false;
 744                 }
 745
 746                 switch (self::$driver) {
 747                         case 'pdo':
 748                                 $columns = $stmt->fetch(PDO::FETCH_ASSOC);
 749                                 break;
 750                         case 'mysqli':
 751                                 if (get_class($stmt) == 'mysqli_result') {
 752                                         $columns = $stmt->fetch_assoc();
 753                                         break;
 754                                 }
 755
 756                                 // This code works, but is slow
 757
 758                                 // Bind the result to a result array
 759                                 $cols = [];
 760
 761                                 $cols_num = [];
 762                                 for ($x = 0; $x < $stmt->field_count; $x++) {
 763                                         $cols[] = &$cols_num[$x];
 764                                 }
 765
 766                                 call_user_func_array([$stmt, 'bind_result'], $cols);
 767
 768                                 if (!$stmt->fetch()) {
 769                                         return false;
 770                                 }
 771
 772                                 // The slow part:
 773                                 // We need to get the field names for the array keys
 774                                 // It seems that there is no better way to do this.
 775                                 $result = $stmt->result_metadata();
 776                                 $fields = $result->fetch_fields();
 777
 778                                 foreach ($cols_num AS $param => $col) {
 779                                         $columns[$fields[$param]->name] = $col;
 780                                 }
 781                 }
 782
 783                 $a->save_timestamp($stamp1, 'database');
 784
 785                 return $columns;
 786         }
 787
 788         /**
 789          * @brief Insert a row into a table
 790          *
 791          * @param string $table Table name
 792          * @param array $param parameter array
 793          * @param bool $on_duplicate_update Do an update on a duplicate entry
 794          *
 795          * @return boolean was the insert successfull?
 796          */
 797         public static function insert($table, $param, $on_duplicate_update = false) {
 798
 799                 if (empty($table) || empty($param)) {
 800                         logger('Table and fields have to be set');
 801                         return false;
 802                 }
 803
 804                 $sql = "INSERT INTO `".self::escape($table)."` (`".implode("`, `", array_keys($param))."`) VALUES (".
 805                         substr(str_repeat("?, ", count($param)), 0, -2).")";
 806
 807                 if ($on_duplicate_update) {
 808                         $sql .= " ON DUPLICATE KEY UPDATE `".implode("` = ?, `", array_keys($param))."` = ?";
 809
 810                         $values = array_values($param);
 811                         $param = array_merge_recursive($values, $values);
 812                 }
 813
 814                 return self::e($sql, $param);
 815         }
 816
 817         /**
 818          * @brief Fetch the id of the last insert command
 819          *
 820          * @return integer Last inserted id
 821          */
 822         public static function lastInsertId() {
 823                 switch (self::$driver) {
 824                         case 'pdo':
 825                                 $id = self::$db->lastInsertId();
 826                                 break;
 827                         case 'mysqli':
 828                                 $id = self::$db->insert_id;
 829                                 break;
 830                 }
 831                 return $id;
 832         }
 833
 834         /**
 835          * @brief Locks a table for exclusive write access
 836          *
 837          * This function can be extended in the future to accept a table array as well.
 838          *
 839          * @param string $table Table name
 840          *
 841          * @return boolean was the lock successful?
 842          */
 843         public static function lock($table) {
 844                 // See here: https://dev.mysql.com/doc/refman/5.7/en/lock-tables-and-transactions.html
 845                 self::e("SET autocommit=0");
 846                 $success = self::e("LOCK TABLES `".self::escape($table)."` WRITE");
 847                 if (!$success) {
 848                         self::e("SET autocommit=1");
 849                 } else {
 850                         self::$in_transaction = true;
 851                 }
 852                 return $success;
 853         }
 854
 855         /**
 856          * @brief Unlocks all locked tables
 857          *
 858          * @return boolean was the unlock successful?
 859          */
 860         public static function unlock() {
 861                 // See here: https://dev.mysql.com/doc/refman/5.7/en/lock-tables-and-transactions.html
 862                 self::e("COMMIT");
 863                 $success = self::e("UNLOCK TABLES");
 864                 self::e("SET autocommit=1");
 865                 self::$in_transaction = false;
 866                 return $success;
 867         }
 868
 869         /**
 870          * @brief Starts a transaction
 871          *
 872          * @return boolean Was the command executed successfully?
 873          */
 874         public static function transaction() {
 875                 if (!self::e('COMMIT')) {
 876                         return false;
 877                 }
 878                 if (!self::e('START TRANSACTION')) {
 879                         return false;
 880                 }
 881                 self::$in_transaction = true;
 882                 return true;
 883         }
 884
 885         /**
 886          * @brief Does a commit
 887          *
 888          * @return boolean Was the command executed successfully?
 889          */
 890         public static function commit() {
 891                 if (!self::e('COMMIT')) {
 892                         return false;
 893                 }
 894                 self::$in_transaction = false;
 895                 return true;
 896         }
 897
 898         /**
 899          * @brief Does a rollback
 900          *
 901          * @return boolean Was the command executed successfully?
 902          */
 903         public static function rollback() {
 904                 if (!self::e('ROLLBACK')) {
 905                         return false;
 906                 }
 907                 self::$in_transaction = false;
 908                 return true;
 909         }
 910
 911         /**
 912          * @brief Build the array with the table relations
 913          *
 914          * The array is build from the database definitions in DBStructure.php
 915          *
 916          * This process must only be started once, since the value is cached.
 917          */
 918         private static function buildRelationData() {
 919                 $definition = DBStructure::definition();
 920
 921                 foreach ($definition AS $table => $structure) {
 922                         foreach ($structure['fields'] AS $field => $field_struct) {
 923                                 if (isset($field_struct['relation'])) {
 924                                         foreach ($field_struct['relation'] AS $rel_table => $rel_field) {
 925                                                 self::$relation[$rel_table][$rel_field][$table][] = $field;
 926                                         }
 927                                 }
 928                         }
 929                 }
 930         }
 931
 932         /**
 933          * @brief Delete a row from a table
 934          *
 935          * @param string  $table       Table name
 936          * @param array   $conditions  Field condition(s)
 937          * @param array   $options
 938          *                - cascade: If true we delete records in other tables that depend on the one we're deleting through
 939          *                           relations (default: true)
 940          * @param boolean $in_process  Internal use: Only do a commit after the last delete
 941          * @param array   $callstack   Internal use: prevent endless loops
 942          *
 943          * @return boolean|array was the delete successful? When $in_process is set: deletion data
 944          */
 945         public static function delete($table, array $conditions, array $options = [], $in_process = false, array &$callstack = [])
 946         {
 947                 if (empty($table) || empty($conditions)) {
 948                         logger('Table and conditions have to be set');
 949                         return false;
 950                 }
 951
 952                 $commands = [];
 953
 954                 // Create a key for the loop prevention
 955                 $key = $table . ':' . implode(':', array_keys($conditions)) . ':' . implode(':', $conditions);
 956
 957                 // We quit when this key already exists in the callstack.
 958                 if (isset($callstack[$key])) {
 959                         return $commands;
 960                 }
 961
 962                 $callstack[$key] = true;
 963
 964                 $table = self::escape($table);
 965
 966                 $commands[$key] = ['table' => $table, 'conditions' => $conditions];
 967
 968                 $cascade = defaults($options, 'cascade', true);
 969
 970                 // To speed up the whole process we cache the table relations
 971                 if ($cascade && count(self::$relation) == 0) {
 972                         self::buildRelationData();
 973                 }
 974
 975                 // Is there a relation entry for the table?
 976                 if ($cascade && isset(self::$relation[$table])) {
 977                         // We only allow a simple "one field" relation.
 978                         $field = array_keys(self::$relation[$table])[0];
 979                         $rel_def = array_values(self::$relation[$table])[0];
 980
 981                         // Create a key for preventing double queries
 982                         $qkey = $field . '-' . $table . ':' . implode(':', array_keys($conditions)) . ':' . implode(':', $conditions);
 983
 984                         // When the search field is the relation field, we don't need to fetch the rows
 985                         // This is useful when the leading record is already deleted in the frontend but the rest is done in the backend
 986                         if ((count($conditions) == 1) && ($field == array_keys($conditions)[0])) {
 987                                 foreach ($rel_def AS $rel_table => $rel_fields) {
 988                                         foreach ($rel_fields AS $rel_field) {
 989                                                 $retval = self::delete($rel_table, [$rel_field => array_values($conditions)[0]], $options, true, $callstack);
 990                                                 $commands = array_merge($commands, $retval);
 991                                         }
 992                                 }
 993                                 // We quit when this key already exists in the callstack.
 994                         } elseif (!isset($callstack[$qkey])) {
 995
 996                                 $callstack[$qkey] = true;
 997
 998                                 // Fetch all rows that are to be deleted
 999                                 $data = self::select($table, [$field], $conditions);
1000
1001                                 while ($row = self::fetch($data)) {
1002                                         // Now we accumulate the delete commands
1003                                         $retval = self::delete($table, [$field => $row[$field]], $options, true, $callstack);
1004                                         $commands = array_merge($commands, $retval);
1005                                 }
1006
1007                                 self::close($data);
1008
1009                                 // Since we had split the delete command we don't need the original command anymore
1010                                 unset($commands[$key]);
1011                         }
1012                 }
1013
1014                 if (!$in_process) {
1015                         // Now we finalize the process
1016                         $do_transaction = !self::$in_transaction;
1017
1018                         if ($do_transaction) {
1019                                 self::transaction();
1020                         }
1021
1022                         $compacted = [];
1023                         $counter = [];
1024
1025                         foreach ($commands AS $command) {
1026                                 $conditions = $command['conditions'];
1027                                 reset($conditions);
1028                                 $first_key = key($conditions);
1029
1030                                 $condition_string = self::buildCondition($conditions);
1031
1032                                 if ((count($command['conditions']) > 1) || is_int($first_key)) {
1033                                         $sql = "DELETE FROM `" . $command['table'] . "`" . $condition_string;
1034                                         logger(self::replaceParameters($sql, $conditions), LOGGER_DATA);
1035
1036                                         if (!self::e($sql, $conditions)) {
1037                                                 if ($do_transaction) {
1038                                                         self::rollback();
1039                                                 }
1040                                                 return false;
1041                                         }
1042                                 } else {
1043                                         $key_table = $command['table'];
1044                                         $key_condition = array_keys($command['conditions'])[0];
1045                                         $value = array_values($command['conditions'])[0];
1046
1047                                         // Split the SQL queries in chunks of 100 values
1048                                         // We do the $i stuff here to make the code better readable
1049                                         $i = $counter[$key_table][$key_condition];
1050                                         if (isset($compacted[$key_table][$key_condition][$i]) && count($compacted[$key_table][$key_condition][$i]) > 100) {
1051                                                 ++$i;
1052                                         }
1053
1054                                         $compacted[$key_table][$key_condition][$i][$value] = $value;
1055                                         $counter[$key_table][$key_condition] = $i;
1056                                 }
1057                         }
1058                         foreach ($compacted AS $table => $values) {
1059                                 foreach ($values AS $field => $field_value_list) {
1060                                         foreach ($field_value_list AS $field_values) {
1061                                                 $sql = "DELETE FROM `" . $table . "` WHERE `" . $field . "` IN (" .
1062                                                         substr(str_repeat("?, ", count($field_values)), 0, -2) . ");";
1063
1064                                                 logger(self::replaceParameters($sql, $field_values), LOGGER_DATA);
1065
1066                                                 if (!self::e($sql, $field_values)) {
1067                                                         if ($do_transaction) {
1068                                                                 self::rollback();
1069                                                         }
1070                                                         return false;
1071                                                 }
1072                                         }
1073                                 }
1074                         }
1075                         if ($do_transaction) {
1076                                 self::commit();
1077                         }
1078                         return true;
1079                 }
1080
1081                 return $commands;
1082         }
1083
1084         /**
1085          * @brief Updates rows
1086          *
1087          * Updates rows in the database. When $old_fields is set to an array,
1088          * the system will only do an update if the fields in that array changed.
1089          *
1090          * Attention:
1091          * Only the values in $old_fields are compared.
1092          * This is an intentional behaviour.
1093          *
1094          * Example:
1095          * We include the timestamp field in $fields but not in $old_fields.
1096          * Then the row will only get the new timestamp when the other fields had changed.
1097          *
1098          * When $old_fields is set to a boolean value the system will do this compare itself.
1099          * When $old_fields is set to "true" the system will do an insert if the row doesn't exists.
1100          *
1101          * Attention:
1102          * Only set $old_fields to a boolean value when you are sure that you will update a single row.
1103          * When you set $old_fields to "true" then $fields must contain all relevant fields!
1104          *
1105          * @param string $table Table name
1106          * @param array $fields contains the fields that are updated
1107          * @param array $condition condition array with the key values
1108          * @param array|boolean $old_fields array with the old field values that are about to be replaced (true = update on duplicate)
1109          *
1110          * @return boolean was the update successfull?
1111          */
1112         public static function update($table, $fields, $condition, $old_fields = []) {
1113
1114                 if (empty($table) || empty($fields) || empty($condition)) {
1115                         logger('Table, fields and condition have to be set');
1116                         return false;
1117                 }
1118
1119                 $table = self::escape($table);
1120
1121                 $condition_string = self::buildCondition($condition);
1122
1123                 if (is_bool($old_fields)) {
1124                         $do_insert = $old_fields;
1125
1126                         $old_fields = self::selectFirst($table, [], $condition);
1127
1128                         if (is_bool($old_fields)) {
1129                                 if ($do_insert) {
1130                                         $values = array_merge($condition, $fields);
1131                                         return self::insert($table, $values, $do_insert);
1132                                 }
1133                                 $old_fields = [];
1134                         }
1135                 }
1136
1137                 $do_update = (count($old_fields) == 0);
1138
1139                 foreach ($old_fields AS $fieldname => $content) {
1140                         if (isset($fields[$fieldname])) {
1141                                 if ($fields[$fieldname] == $content) {
1142                                         unset($fields[$fieldname]);
1143                                 } else {
1144                                         $do_update = true;
1145                                 }
1146                         }
1147                 }
1148
1149                 if (!$do_update || (count($fields) == 0)) {
1150                         return true;
1151                 }
1152
1153                 $sql = "UPDATE `".$table."` SET `".
1154                         implode("` = ?, `", array_keys($fields))."` = ?".$condition_string;
1155
1156                 $params1 = array_values($fields);
1157                 $params2 = array_values($condition);
1158                 $params = array_merge_recursive($params1, $params2);
1159
1160                 return self::e($sql, $params);
1161         }
1162
1163         /**
1164          * Retrieve a single record from a table and returns it in an associative array
1165          *
1166          * @brief Retrieve a single record from a table
1167          * @param string $table
1168          * @param array  $fields
1169          * @param array  $condition
1170          * @param array  $params
1171          * @return bool|array
1172          * @see dba::select
1173          */
1174         public static function selectFirst($table, array $fields = [], array $condition = [], $params = [])
1175         {
1176                 $params['limit'] = 1;
1177                 $result = self::select($table, $fields, $condition, $params);
1178
1179                 if (is_bool($result)) {
1180                         return $result;
1181                 } else {
1182                         $row = self::fetch($result);
1183                         self::close($result);
1184                         return $row;
1185                 }
1186         }
1187
1188         /**
1189          * @brief Select rows from a table
1190          *
1191          * @param string $table     Table name
1192          * @param array  $fields    Array of selected fields, empty for all
1193          * @param array  $condition Array of fields for condition
1194          * @param array  $params    Array of several parameters
1195          *
1196          * @return boolean|object
1197          *
1198          * Example:
1199          * $table = "item";
1200          * $fields = array("id", "uri", "uid", "network");
1201          *
1202          * $condition = array("uid" => 1, "network" => 'dspr');
1203          * or:
1204          * $condition = array("`uid` = ? AND `network` IN (?, ?)", 1, 'dfrn', 'dspr');
1205          *
1206          * $params = array("order" => array("id", "received" => true), "limit" => 10);
1207          *
1208          * $data = dba::select($table, $fields, $condition, $params);
1209          */
1210         public static function select($table, array $fields = [], array $condition = [], array $params = [])
1211         {
1212                 if ($table == '') {
1213                         return false;
1214                 }
1215
1216                 $table = self::escape($table);
1217
1218                 if (count($fields) > 0) {
1219                         $select_fields = "`" . implode("`, `", array_values($fields)) . "`";
1220                 } else {
1221                         $select_fields = "*";
1222                 }
1223
1224                 $condition_string = self::buildCondition($condition);
1225
1226                 $param_string = self::buildParameter($params);
1227
1228                 $sql = "SELECT " . $select_fields . " FROM `" . $table . "`" . $condition_string . $param_string;
1229
1230                 $result = self::p($sql, $condition);
1231
1232                 return $result;
1233         }
1234
1235         /**
1236          * @brief Counts the rows from a table satisfying the provided condition
1237          *
1238          * @param string $table Table name
1239          * @param array $condition array of fields for condition
1240          *
1241          * @return int
1242          *
1243          * Example:
1244          * $table = "item";
1245          *
1246          * $condition = ["uid" => 1, "network" => 'dspr'];
1247          * or:
1248          * $condition = ["`uid` = ? AND `network` IN (?, ?)", 1, 'dfrn', 'dspr'];
1249          *
1250          * $count = dba::count($table, $condition);
1251          */
1252         public static function count($table, array $condition = [])
1253         {
1254                 if ($table == '') {
1255                         return false;
1256                 }
1257
1258                 $condition_string = self::buildCondition($condition);
1259
1260                 $sql = "SELECT COUNT(*) AS `count` FROM `".$table."`".$condition_string;
1261
1262                 $row = self::fetch_first($sql, $condition);
1263
1264                 return $row['count'];
1265         }
1266
1267         /**
1268          * @brief Returns the SQL condition string built from the provided condition array
1269          *
1270          * This function operates with two modes.
1271          * - Supplied with a filed/value associative array, it builds simple strict
1272          *   equality conditions linked by AND.
1273          * - Supplied with a flat list, the first element is the condition string and
1274          *   the following arguments are the values to be interpolated
1275          *
1276          * $condition = ["uid" => 1, "network" => 'dspr'];
1277          * or:
1278          * $condition = ["`uid` = ? AND `network` IN (?, ?)", 1, 'dfrn', 'dspr'];
1279          *
1280          * In either case, the provided array is left with the parameters only
1281          *
1282          * @param array $condition
1283          * @return string
1284          */
1285         public static function buildCondition(array &$condition = [])
1286         {
1287                 $condition_string = '';
1288                 if (count($condition) > 0) {
1289                         reset($condition);
1290                         $first_key = key($condition);
1291                         if (is_int($first_key)) {
1292                                 $condition_string = " WHERE (" . array_shift($condition) . ")";
1293                         } else {
1294                                 $new_values = [];
1295                                 $condition_string = "";
1296                                 foreach ($condition as $field => $value) {
1297                                         if ($condition_string != "") {
1298                                                 $condition_string .= " AND ";
1299                                         }
1300                                         if (is_array($value)) {
1301                                                 // Check if there are integer values in the parameters
1302                                                 $is_int = false;
1303                                                 $is_float = false;
1304                                                 $is_alpha = false;
1305                                                 foreach ($value as $single_value) {
1306                                                         if (is_int($single_value)) {
1307                                                                 $is_int = true;
1308                                                         }
1309
1310                                                         // To prevent to round floats we look for them
1311                                                         if (is_float($single_value)) {
1312                                                                 $is_float = true;
1313                                                         }
1314
1315                                                         // Is any non numeric value present?
1316                                                         if (!is_numeric($single_value)) {
1317                                                                 $is_alpha = true;
1318                                                         }
1319                                                 }
1320
1321                                                 // Cast them all in an unique method
1322                                                 if ($is_int) {
1323                                                         $casted = [];
1324                                                         foreach ($value as $single_value) {
1325                                                                 if (!$is_alpha && !$is_float) {
1326                                                                         $casted[] = (int)$single_value;
1327                                                                 } else {
1328                                                                         $casted[] = (string)$single_value;
1329                                                                 }
1330                                                         }
1331                                                         $value = $casted;
1332                                                 }
1333
1334                                                 $new_values = array_merge($new_values, array_values($value));
1335                                                 $placeholders = substr(str_repeat("?, ", count($value)), 0, -2);
1336                                                 $condition_string .= "`" . $field . "` IN (" . $placeholders . ")";
1337                                         } else {
1338                                                 $new_values[$field] = $value;
1339                                                 $condition_string .= "`" . $field . "` = ?";
1340                                         }
1341                                 }
1342                                 $condition_string = " WHERE (" . $condition_string . ")";
1343                                 $condition = $new_values;
1344                         }
1345                 }
1346
1347                 return $condition_string;
1348         }
1349
1350         /**
1351          * @brief Returns the SQL parameter string built from the provided parameter array
1352          *
1353          * @param array $params
1354          * @return string
1355          */
1356         public static function buildParameter(array $params = [])
1357         {
1358                 $order_string = '';
1359                 if (isset($params['order'])) {
1360                         $order_string = " ORDER BY ";
1361                         foreach ($params['order'] AS $fields => $order) {
1362                                 if (!is_int($fields)) {
1363                                         $order_string .= "`" . $fields . "` " . ($order ? "DESC" : "ASC") . ", ";
1364                                 } else {
1365                                         $order_string .= "`" . $order . "`, ";
1366                                 }
1367                         }
1368                         $order_string = substr($order_string, 0, -2);
1369                 }
1370
1371                 $limit_string = '';
1372                 if (isset($params['limit']) && is_int($params['limit'])) {
1373                         $limit_string = " LIMIT " . $params['limit'];
1374                 }
1375
1376                 if (isset($params['limit']) && is_array($params['limit'])) {
1377                         $limit_string = " LIMIT " . intval($params['limit'][0]) . ", " . intval($params['limit'][1]);
1378                 }
1379
1380                 return $order_string.$limit_string;
1381         }
1382
1383         /**
1384          * @brief Fills an array with data from a query
1385          *
1386          * @param object $stmt statement object
1387          * @return array Data array
1388          */
1389         public static function inArray($stmt, $do_close = true) {
1390                 if (is_bool($stmt)) {
1391                         return $stmt;
1392                 }
1393
1394                 $data = [];
1395                 while ($row = self::fetch($stmt)) {
1396                         $data[] = $row;
1397                 }
1398                 if ($do_close) {
1399                         self::close($stmt);
1400                 }
1401                 return $data;
1402         }
1403
1404         /**
1405          * @brief Returns the error number of the last query
1406          *
1407          * @return string Error number (0 if no error)
1408          */
1409         public static function errorNo() {
1410                 return self::$errorno;
1411         }
1412
1413         /**
1414          * @brief Returns the error message of the last query
1415          *
1416          * @return string Error message ('' if no error)
1417          */
1418         public static function errorMessage() {
1419                 return self::$error;
1420         }
1421
1422         /**
1423          * @brief Closes the current statement
1424          *
1425          * @param object $stmt statement object
1426          * @return boolean was the close successful?
1427          */
1428         public static function close($stmt) {
1429                 $a = get_app();
1430
1431                 $stamp1 = microtime(true);
1432
1433                 if (!is_object($stmt)) {
1434                         return false;
1435                 }
1436
1437                 switch (self::$driver) {
1438                         case 'pdo':
1439                                 $ret = $stmt->closeCursor();
1440                                 break;
1441                         case 'mysqli':
1442                                 $stmt->free_result();
1443                                 $ret = $stmt->close();
1444                                 break;
1445                 }
1446
1447                 $a->save_timestamp($stamp1, 'database');
1448
1449                 return $ret;
1450         }
1451 }
1452
1453 function dbesc($str) {
1454         if (dba::$connected) {
1455                 return(dba::escape($str));
1456         } else {
1457                 return(str_replace("'","\\'",$str));
1458         }
1459 }
1460
1461 /**
1462  * @brief execute SQL query with printf style args - deprecated
1463  *
1464  * Please use the dba:: functions instead:
1465  * dba::select, dba::exists, dba::insert
1466  * dba::delete, dba::update, dba::p, dba::e
1467  *
1468  * @param $args Query parameters (1 to N parameters of different types)
1469  * @return array|bool Query array
1470  */
1471 function q($sql) {
1472         $args = func_get_args();
1473         unset($args[0]);
1474
1475         if (!dba::$connected) {
1476                 return false;
1477         }
1478
1479         $sql = dba::clean_query($sql);
1480         $sql = dba::any_value_fallback($sql);
1481
1482         $stmt = @vsprintf($sql, $args);
1483
1484         $ret = dba::p($stmt);
1485
1486         if (is_bool($ret)) {
1487                 return $ret;
1488         }
1489
1490         $columns = dba::columnCount($ret);
1491
1492         $data = dba::inArray($ret);
1493
1494         if ((count($data) == 0) && ($columns == 0)) {
1495                 return true;
1496         }
1497
1498         return $data;
1499 }
1500
1501 function dba_timer() {
1502         return microtime(true);
1503 }