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friendica/src/Database/Database.php
2021-02-21 07:46:58 +00:00

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<?php
/**
* @copyright Copyright (C) 2020, Friendica
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
namespace Friendica\Database;
use Friendica\Core\Config\Cache;
use Friendica\Core\System;
use Friendica\Network\HTTPException\InternalServerErrorException;
use Friendica\Util\DateTimeFormat;
use Friendica\Util\Profiler;
use mysqli;
use mysqli_result;
use mysqli_stmt;
use PDO;
use PDOException;
use PDOStatement;
use Psr\Log\LoggerInterface;
/**
* This class is for the low level database stuff that does driver specific things.
*/
class Database
{
const PDO = 'pdo';
const MYSQLI = 'mysqli';
const INSERT_DEFAULT = 0;
const INSERT_UPDATE = 1;
const INSERT_IGNORE = 2;
protected $connected = false;
/**
* @var Cache
*/
protected $configCache;
/**
* @var Profiler
*/
protected $profiler;
/**
* @var LoggerInterface
*/
protected $logger;
protected $server_info = '';
/** @var PDO|mysqli */
protected $connection;
protected $driver;
protected $pdo_emulate_prepares = false;
private $error = false;
private $errorno = 0;
private $affected_rows = 0;
protected $in_transaction = false;
protected $in_retrial = false;
protected $testmode = false;
private $relation = [];
public function __construct(Cache $configCache, Profiler $profiler, LoggerInterface $logger)
{
// We are storing these values for being able to perform a reconnect
$this->configCache = $configCache;
$this->profiler = $profiler;
$this->logger = $logger;
$this->connect();
if ($this->isConnected()) {
// Loads DB_UPDATE_VERSION constant
DBStructure::definition($configCache->get('system', 'basepath'), false);
}
}
public function connect()
{
if (!is_null($this->connection) && $this->connected()) {
return $this->connected;
}
// Reset connected state
$this->connected = false;
$port = 0;
$serveraddr = trim($this->configCache->get('database', 'hostname'));
$serverdata = explode(':', $serveraddr);
$server = $serverdata[0];
if (count($serverdata) > 1) {
$port = trim($serverdata[1]);
}
if (!empty(trim($this->configCache->get('database', 'port')))) {
$port = trim($this->configCache->get('database', 'port'));
}
$server = trim($server);
$user = trim($this->configCache->get('database', 'username'));
$pass = trim($this->configCache->get('database', 'password'));
$db = trim($this->configCache->get('database', 'database'));
$charset = trim($this->configCache->get('database', 'charset'));
if (!(strlen($server) && strlen($user))) {
return false;
}
$persistent = (bool)$this->configCache->get('database', 'persistent');
$this->pdo_emulate_prepares = (bool)$this->configCache->get('database', 'pdo_emulate_prepares');
if (!$this->configCache->get('database', 'disable_pdo') && class_exists('\PDO') && in_array('mysql', PDO::getAvailableDrivers())) {
$this->driver = self::PDO;
$connect = "mysql:host=" . $server . ";dbname=" . $db;
if ($port > 0) {
$connect .= ";port=" . $port;
}
if ($charset) {
$connect .= ";charset=" . $charset;
}
try {
$this->connection = @new PDO($connect, $user, $pass, [PDO::ATTR_PERSISTENT => $persistent]);
$this->connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, $this->pdo_emulate_prepares);
$this->connected = true;
} catch (PDOException $e) {
$this->connected = false;
}
}
if (!$this->connected && class_exists('\mysqli')) {
$this->driver = self::MYSQLI;
if ($port > 0) {
$this->connection = @new mysqli($server, $user, $pass, $db, $port);
} else {
$this->connection = @new mysqli($server, $user, $pass, $db);
}
if (!mysqli_connect_errno()) {
$this->connected = true;
if ($charset) {
$this->connection->set_charset($charset);
}
}
}
// No suitable SQL driver was found.
if (!$this->connected) {
$this->driver = null;
$this->connection = null;
}
return $this->connected;
}
public function setTestmode(bool $test)
{
$this->testmode = $test;
}
/**
* Sets the logger for DBA
*
* @note this is necessary because if we want to load the logger configuration
* from the DB, but there's an error, we would print out an exception.
* So the logger gets updated after the logger configuration can be retrieved
* from the database
*
* @param LoggerInterface $logger
*/
public function setLogger(LoggerInterface $logger)
{
$this->logger = $logger;
}
/**
* Sets the profiler for DBA
*
* @param Profiler $profiler
*/
public function setProfiler(Profiler $profiler)
{
$this->profiler = $profiler;
}
/**
* Disconnects the current database connection
*/
public function disconnect()
{
if (!is_null($this->connection)) {
switch ($this->driver) {
case self::PDO:
$this->connection = null;
break;
case self::MYSQLI:
$this->connection->close();
$this->connection = null;
break;
}
}
$this->driver = null;
$this->connected = false;
}
/**
* Perform a reconnect of an existing database connection
*/
public function reconnect()
{
$this->disconnect();
return $this->connect();
}
/**
* Return the database object.
*
* @return PDO|mysqli
*/
public function getConnection()
{
return $this->connection;
}
/**
* Return the database driver string
*
* @return string with either "pdo" or "mysqli"
*/
public function getDriver()
{
return $this->driver;
}
/**
* Returns the MySQL server version string
*
* This function discriminate between the deprecated mysql API and the current
* object-oriented mysqli API. Example of returned string: 5.5.46-0+deb8u1
*
* @return string
*/
public function serverInfo()
{
if ($this->server_info == '') {
switch ($this->driver) {
case self::PDO:
$this->server_info = $this->connection->getAttribute(PDO::ATTR_SERVER_VERSION);
break;
case self::MYSQLI:
$this->server_info = $this->connection->server_info;
break;
}
}
return $this->server_info;
}
/**
* Returns the selected database name
*
* @return string
* @throws \Exception
*/
public function databaseName()
{
$ret = $this->p("SELECT DATABASE() AS `db`");
$data = $this->toArray($ret);
return $data[0]['db'];
}
/**
* Analyze a database query and log this if some conditions are met.
*
* @param string $query The database query that will be analyzed
*
* @throws \Exception
*/
private function logIndex($query)
{
if (!$this->configCache->get('system', 'db_log_index')) {
return;
}
// Don't explain an explain statement
if (strtolower(substr($query, 0, 7)) == "explain") {
return;
}
// Only do the explain on "select", "update" and "delete"
if (!in_array(strtolower(substr($query, 0, 6)), ["select", "update", "delete"])) {
return;
}
$r = $this->p("EXPLAIN " . $query);
if (!$this->isResult($r)) {
return;
}
$watchlist = explode(',', $this->configCache->get('system', 'db_log_index_watch'));
$denylist = explode(',', $this->configCache->get('system', 'db_log_index_denylist'));
while ($row = $this->fetch($r)) {
if ((intval($this->configCache->get('system', 'db_loglimit_index')) > 0)) {
$log = (in_array($row['key'], $watchlist) &&
($row['rows'] >= intval($this->configCache->get('system', 'db_loglimit_index'))));
} else {
$log = false;
}
if ((intval($this->configCache->get('system', 'db_loglimit_index_high')) > 0) && ($row['rows'] >= intval($this->configCache->get('system', 'db_loglimit_index_high')))) {
$log = true;
}
if (in_array($row['key'], $denylist) || ($row['key'] == "")) {
$log = false;
}
if ($log) {
$backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
@file_put_contents($this->configCache->get('system', 'db_log_index'), DateTimeFormat::utcNow() . "\t" .
$row['key'] . "\t" . $row['rows'] . "\t" . $row['Extra'] . "\t" .
basename($backtrace[1]["file"]) . "\t" .
$backtrace[1]["line"] . "\t" . $backtrace[2]["function"] . "\t" .
substr($query, 0, 4000) . "\n", FILE_APPEND);
}
}
}
/**
* Removes every not allowlisted character from the identifier string
*
* @param string $identifier
*
* @return string sanitized identifier
* @throws \Exception
*/
private function sanitizeIdentifier($identifier)
{
return preg_replace('/[^A-Za-z0-9_\-]+/', '', $identifier);
}
public function escape($str)
{
if ($this->connected) {
switch ($this->driver) {
case self::PDO:
return substr(@$this->connection->quote($str, PDO::PARAM_STR), 1, -1);
case self::MYSQLI:
return @$this->connection->real_escape_string($str);
}
} else {
return str_replace("'", "\\'", $str);
}
}
public function isConnected()
{
return $this->connected;
}
public function connected()
{
$connected = false;
if (is_null($this->connection)) {
return false;
}
switch ($this->driver) {
case self::PDO:
$r = $this->p("SELECT 1");
if ($this->isResult($r)) {
$row = $this->toArray($r);
$connected = ($row[0]['1'] == '1');
}
break;
case self::MYSQLI:
$connected = $this->connection->ping();
break;
}
return $connected;
}
/**
* Replaces ANY_VALUE() function by MIN() function,
* if the database server does not support ANY_VALUE().
*
* Considerations for Standard SQL, or MySQL with ONLY_FULL_GROUP_BY (default since 5.7.5).
* ANY_VALUE() is available from MySQL 5.7.5 https://dev.mysql.com/doc/refman/5.7/en/miscellaneous-functions.html
* A standard fall-back is to use MIN().
*
* @param string $sql An SQL string without the values
*
* @return string The input SQL string modified if necessary.
*/
public function anyValueFallback($sql)
{
$server_info = $this->serverInfo();
if (version_compare($server_info, '5.7.5', '<') ||
(stripos($server_info, 'MariaDB') !== false)) {
$sql = str_ireplace('ANY_VALUE(', 'MIN(', $sql);
}
return $sql;
}
/**
* Replaces the ? placeholders with the parameters in the $args array
*
* @param string $sql SQL query
* @param array $args The parameters that are to replace the ? placeholders
*
* @return string The replaced SQL query
*/
private function replaceParameters($sql, $args)
{
$offset = 0;
foreach ($args AS $param => $value) {
if (is_int($args[$param]) || is_float($args[$param]) || is_bool($args[$param])) {
$replace = intval($args[$param]);
} elseif (is_null($args[$param])) {
$replace = 'NULL';
} else {
$replace = "'" . $this->escape($args[$param]) . "'";
}
$pos = strpos($sql, '?', $offset);
if ($pos !== false) {
$sql = substr_replace($sql, $replace, $pos, 1);
}
$offset = $pos + strlen($replace);
}
return $sql;
}
/**
* Executes a prepared statement that returns data
*
* @usage Example: $r = p("SELECT * FROM `post` WHERE `guid` = ?", $guid);
*
* Please only use it with complicated queries.
* For all regular queries please use DBA::select or DBA::exists
*
* @param string $sql SQL statement
*
* @return bool|object statement object or result object
* @throws \Exception
*/
public function p($sql)
{
$stamp1 = microtime(true);
$params = DBA::getParam(func_get_args());
// Renumber the array keys to be sure that they fit
$i = 0;
$args = [];
foreach ($params AS $param) {
// Avoid problems with some MySQL servers and boolean values. See issue #3645
if (is_bool($param)) {
$param = (int)$param;
}
$args[++$i] = $param;
}
if (!$this->connected) {
return false;
}
if ((substr_count($sql, '?') != count($args)) && (count($args) > 0)) {
// Question: Should we continue or stop the query here?
$this->logger->warning('Query parameters mismatch.', ['query' => $sql, 'args' => $args, 'callstack' => System::callstack()]);
}
$sql = DBA::cleanQuery($sql);
$sql = $this->anyValueFallback($sql);
$orig_sql = $sql;
if ($this->configCache->get('system', 'db_callstack') !== null) {
$sql = "/*" . System::callstack() . " */ " . $sql;
}
$is_error = false;
$this->error = '';
$this->errorno = 0;
$this->affected_rows = 0;
// We have to make some things different if this function is called from "e"
$trace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 2);
if (isset($trace[1])) {
$called_from = $trace[1];
} else {
// We use just something that is defined to avoid warnings
$called_from = $trace[0];
}
// We are having an own error logging in the function "e"
$called_from_e = ($called_from['function'] == 'e');
if (!isset($this->connection)) {
throw new InternalServerErrorException('The Connection is empty, although connected is set true.');
}
switch ($this->driver) {
case self::PDO:
// If there are no arguments we use "query"
if (count($args) == 0) {
if (!$retval = $this->connection->query($this->replaceParameters($sql, $args))) {
$errorInfo = $this->connection->errorInfo();
$this->error = $errorInfo[2];
$this->errorno = $errorInfo[1];
$retval = false;
$is_error = true;
break;
}
$this->affected_rows = $retval->rowCount();
break;
}
/** @var $stmt mysqli_stmt|PDOStatement */
if (!$stmt = $this->connection->prepare($sql)) {
$errorInfo = $this->connection->errorInfo();
$this->error = $errorInfo[2];
$this->errorno = $errorInfo[1];
$retval = false;
$is_error = true;
break;
}
foreach ($args AS $param => $value) {
if (is_int($args[$param])) {
$data_type = PDO::PARAM_INT;
} else {
$data_type = PDO::PARAM_STR;
}
$stmt->bindParam($param, $args[$param], $data_type);
}
if (!$stmt->execute()) {
$errorInfo = $stmt->errorInfo();
$this->error = $errorInfo[2];
$this->errorno = $errorInfo[1];
$retval = false;
$is_error = true;
} else {
$retval = $stmt;
$this->affected_rows = $retval->rowCount();
}
break;
case self::MYSQLI:
// There are SQL statements that cannot be executed with a prepared statement
$parts = explode(' ', $orig_sql);
$command = strtolower($parts[0]);
$can_be_prepared = in_array($command, ['select', 'update', 'insert', 'delete']);
// The fallback routine is called as well when there are no arguments
if (!$can_be_prepared || (count($args) == 0)) {
$retval = $this->connection->query($this->replaceParameters($sql, $args));
if ($this->connection->errno) {
$this->error = $this->connection->error;
$this->errorno = $this->connection->errno;
$retval = false;
$is_error = true;
} else {
if (isset($retval->num_rows)) {
$this->affected_rows = $retval->num_rows;
} else {
$this->affected_rows = $this->connection->affected_rows;
}
}
break;
}
$stmt = $this->connection->stmt_init();
if (!$stmt->prepare($sql)) {
$this->error = $stmt->error;
$this->errorno = $stmt->errno;
$retval = false;
$is_error = true;
break;
}
$param_types = '';
$values = [];
foreach ($args AS $param => $value) {
if (is_int($args[$param])) {
$param_types .= 'i';
} elseif (is_float($args[$param])) {
$param_types .= 'd';
} elseif (is_string($args[$param])) {
$param_types .= 's';
} else {
$param_types .= 'b';
}
$values[] = &$args[$param];
}
if (count($values) > 0) {
array_unshift($values, $param_types);
call_user_func_array([$stmt, 'bind_param'], $values);
}
if (!$stmt->execute()) {
$this->error = $this->connection->error;
$this->errorno = $this->connection->errno;
$retval = false;
$is_error = true;
} else {
$stmt->store_result();
$retval = $stmt;
$this->affected_rows = $retval->affected_rows;
}
break;
}
// See issue https://github.com/friendica/friendica/issues/8572
// Ensure that we always get an error message on an error.
if ($is_error && empty($this->errorno)) {
$this->errorno = -1;
}
if ($is_error && empty($this->error)) {
$this->error = 'Unknown database error';
}
// We are having an own error logging in the function "e"
if (($this->errorno != 0) && !$called_from_e) {
// We have to preserve the error code, somewhere in the logging it get lost
$error = $this->error;
$errorno = $this->errorno;
if ($this->testmode) {
throw new DatabaseException($error, $errorno, $this->replaceParameters($sql, $args));
}
$this->logger->error('DB Error', [
'code' => $errorno,
'error' => $error,
'callstack' => System::callstack(8),
'params' => $this->replaceParameters($sql, $args),
]);
// On a lost connection we try to reconnect - but only once.
if ($errorno == 2006) {
if ($this->in_retrial || !$this->reconnect()) {
// It doesn't make sense to continue when the database connection was lost
if ($this->in_retrial) {
$this->logger->notice('Giving up retrial because of database error', [
'code' => $errorno,
'error' => $error,
]);
} else {
$this->logger->notice('Couldn\'t reconnect after database error', [
'code' => $errorno,
'error' => $error,
]);
}
exit(1);
} else {
// We try it again
$this->logger->notice('Reconnected after database error', [
'code' => $errorno,
'error' => $error,
]);
$this->in_retrial = true;
$ret = $this->p($sql, $args);
$this->in_retrial = false;
return $ret;
}
}
$this->error = $error;
$this->errorno = $errorno;
}
$this->profiler->saveTimestamp($stamp1, 'database');
if ($this->configCache->get('system', 'db_log')) {
$stamp2 = microtime(true);
$duration = (float)($stamp2 - $stamp1);
if (($duration > $this->configCache->get('system', 'db_loglimit'))) {
$duration = round($duration, 3);
$backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
@file_put_contents($this->configCache->get('system', 'db_log'), DateTimeFormat::utcNow() . "\t" . $duration . "\t" .
basename($backtrace[1]["file"]) . "\t" .
$backtrace[1]["line"] . "\t" . $backtrace[2]["function"] . "\t" .
substr($this->replaceParameters($sql, $args), 0, 4000) . "\n", FILE_APPEND);
}
}
return $retval;
}
/**
* Executes a prepared statement like UPDATE or INSERT that doesn't return data
*
* Please use DBA::delete, DBA::insert, DBA::update, ... instead
*
* @param string $sql SQL statement
*
* @return boolean Was the query successfull? False is returned only if an error occurred
* @throws \Exception
*/
public function e($sql)
{
$stamp = microtime(true);
$params = DBA::getParam(func_get_args());
// In a case of a deadlock we are repeating the query 20 times
$timeout = 20;
do {
$stmt = $this->p($sql, $params);
if (is_bool($stmt)) {
$retval = $stmt;
} elseif (is_object($stmt)) {
$retval = true;
} else {
$retval = false;
}
$this->close($stmt);
} while (($this->errorno == 1213) && (--$timeout > 0));
if ($this->errorno != 0) {
// We have to preserve the error code, somewhere in the logging it get lost
$error = $this->error;
$errorno = $this->errorno;
if ($this->testmode) {
throw new DatabaseException($error, $errorno, $this->replaceParameters($sql, $params));
}
$this->logger->error('DB Error', [
'code' => $errorno,
'error' => $error,
'callstack' => System::callstack(8),
'params' => $this->replaceParameters($sql, $params),
]);
// On a lost connection we simply quit.
// A reconnect like in $this->p could be dangerous with modifications
if ($errorno == 2006) {
$this->logger->notice('Giving up because of database error', [
'code' => $errorno,
'error' => $error,
]);
exit(1);
}
$this->error = $error;
$this->errorno = $errorno;
}
$this->profiler->saveTimestamp($stamp, "database_write");
return $retval;
}
/**
* Check if data exists
*
* @param string|array $table Table name or array [schema => table]
* @param array $condition array of fields for condition
*
* @return boolean Are there rows for that condition?
* @throws \Exception
*/
public function exists($table, $condition)
{
if (empty($table)) {
return false;
}
$fields = [];
if (empty($condition)) {
return DBStructure::existsTable($table);
}
reset($condition);
$first_key = key($condition);
if (!is_int($first_key)) {
$fields = [$first_key];
}
$stmt = $this->select($table, $fields, $condition, ['limit' => 1]);
if (is_bool($stmt)) {
$retval = $stmt;
} else {
$retval = ($this->numRows($stmt) > 0);
}
$this->close($stmt);
return $retval;
}
/**
* Fetches the first row
*
* Please use DBA::selectFirst or DBA::exists whenever this is possible.
*
* Fetches the first row
*
* @param string $sql SQL statement
*
* @return array first row of query
* @throws \Exception
*/
public function fetchFirst($sql)
{
$params = DBA::getParam(func_get_args());
$stmt = $this->p($sql, $params);
if (is_bool($stmt)) {
$retval = $stmt;
} else {
$retval = $this->fetch($stmt);
}
$this->close($stmt);
return $retval;
}
/**
* Returns the number of affected rows of the last statement
*
* @return int Number of rows
*/
public function affectedRows()
{
return $this->affected_rows;
}
/**
* Returns the number of columns of a statement
*
* @param object Statement object
*
* @return int Number of columns
*/
public function columnCount($stmt)
{
if (!is_object($stmt)) {
return 0;
}
switch ($this->driver) {
case self::PDO:
return $stmt->columnCount();
case self::MYSQLI:
return $stmt->field_count;
}
return 0;
}
/**
* Returns the number of rows of a statement
*
* @param PDOStatement|mysqli_result|mysqli_stmt Statement object
*
* @return int Number of rows
*/
public function numRows($stmt)
{
if (!is_object($stmt)) {
return 0;
}
switch ($this->driver) {
case self::PDO:
return $stmt->rowCount();
case self::MYSQLI:
return $stmt->num_rows;
}
return 0;
}
/**
* Fetch a single row
*
* @param PDOStatement|mysqli_stmt $stmt statement object
*
* @return array|false current row
*/
public function fetch($stmt)
{
$stamp1 = microtime(true);
$columns = [];
if (!is_object($stmt)) {
return false;
}
switch ($this->driver) {
case self::PDO:
$columns = $stmt->fetch(PDO::FETCH_ASSOC);
if (!empty($stmt->table) && is_array($columns)) {
$columns = $this->castFields($stmt->table, $columns);
}
break;
case self::MYSQLI:
if (get_class($stmt) == 'mysqli_result') {
$columns = $stmt->fetch_assoc() ?? false;
break;
}
// This code works, but is slow
// Bind the result to a result array
$cols = [];
$cols_num = [];
for ($x = 0; $x < $stmt->field_count; $x++) {
$cols[] = &$cols_num[$x];
}
call_user_func_array([$stmt, 'bind_result'], $cols);
if (!$stmt->fetch()) {
return false;
}
// The slow part:
// We need to get the field names for the array keys
// It seems that there is no better way to do this.
$result = $stmt->result_metadata();
$fields = $result->fetch_fields();
foreach ($cols_num AS $param => $col) {
$columns[$fields[$param]->name] = $col;
}
}
$this->profiler->saveTimestamp($stamp1, 'database');
return $columns;
}
/**
* Insert a row into a table
*
* @param string|array $table Table name or array [schema => table]
* @param array $param parameter array
* @param int $duplicate_mode What to do on a duplicated entry
*
* @return boolean was the insert successful?
* @throws \Exception
*/
public function insert($table, array $param, int $duplicate_mode = self::INSERT_DEFAULT)
{
if (empty($table) || empty($param)) {
$this->logger->info('Table and fields have to be set');
return false;
}
$param = $this->castFields($table, $param);
$table_string = DBA::buildTableString($table);
$fields_string = implode(', ', array_map([DBA::class, 'quoteIdentifier'], array_keys($param)));
$values_string = substr(str_repeat("?, ", count($param)), 0, -2);
$sql = "INSERT ";
if ($duplicate_mode == self::INSERT_IGNORE) {
$sql .= "IGNORE ";
}
$sql .= "INTO " . $table_string . " (" . $fields_string . ") VALUES (" . $values_string . ")";
if ($duplicate_mode == self::INSERT_UPDATE) {
$fields_string = implode(' = ?, ', array_map([DBA::class, 'quoteIdentifier'], array_keys($param)));
$sql .= " ON DUPLICATE KEY UPDATE " . $fields_string . " = ?";
$values = array_values($param);
$param = array_merge_recursive($values, $values);
}
$result = $this->e($sql, $param);
if (!$result || ($duplicate_mode != self::INSERT_IGNORE)) {
return $result;
}
return $this->affectedRows() != 0;
}
/**
* Inserts a row with the provided data in the provided table.
* If the data corresponds to an existing row through a UNIQUE or PRIMARY index constraints, it updates the row instead.
*
* @param string|array $table Table name or array [schema => table]
* @param array $param parameter array
*
* @return boolean was the insert successful?
* @throws \Exception
*/
public function replace($table, array $param)
{
if (empty($table) || empty($param)) {
$this->logger->info('Table and fields have to be set');
return false;
}
$param = $this->castFields($table, $param);
$table_string = DBA::buildTableString($table);
$fields_string = implode(', ', array_map([DBA::class, 'quoteIdentifier'], array_keys($param)));
$values_string = substr(str_repeat("?, ", count($param)), 0, -2);
$sql = "REPLACE " . $table_string . " (" . $fields_string . ") VALUES (" . $values_string . ")";
return $this->e($sql, $param);
}
/**
* Fetch the id of the last insert command
*
* @return integer Last inserted id
*/
public function lastInsertId()
{
switch ($this->driver) {
case self::PDO:
$id = $this->connection->lastInsertId();
break;
case self::MYSQLI:
$id = $this->connection->insert_id;
break;
}
return (int)$id;
}
/**
* Locks a table for exclusive write access
*
* This function can be extended in the future to accept a table array as well.
*
* @param string|array $table Table name or array [schema => table]
*
* @return boolean was the lock successful?
* @throws \Exception
*/
public function lock($table)
{
// See here: https://dev.mysql.com/doc/refman/5.7/en/lock-tables-and-transactions.html
if ($this->driver == self::PDO) {
$this->e("SET autocommit=0");
$this->connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, true);
} else {
$this->connection->autocommit(false);
}
$success = $this->e("LOCK TABLES " . DBA::buildTableString($table) . " WRITE");
if ($this->driver == self::PDO) {
$this->connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, $this->pdo_emulate_prepares);
}
if (!$success) {
if ($this->driver == self::PDO) {
$this->e("SET autocommit=1");
} else {
$this->connection->autocommit(true);
}
} else {
$this->in_transaction = true;
}
return $success;
}
/**
* Unlocks all locked tables
*
* @return boolean was the unlock successful?
* @throws \Exception
*/
public function unlock()
{
// See here: https://dev.mysql.com/doc/refman/5.7/en/lock-tables-and-transactions.html
$this->performCommit();
if ($this->driver == self::PDO) {
$this->connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, true);
}
$success = $this->e("UNLOCK TABLES");
if ($this->driver == self::PDO) {
$this->connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, $this->pdo_emulate_prepares);
$this->e("SET autocommit=1");
} else {
$this->connection->autocommit(true);
}
$this->in_transaction = false;
return $success;
}
/**
* Starts a transaction
*
* @return boolean Was the command executed successfully?
*/
public function transaction()
{
if (!$this->performCommit()) {
return false;
}
switch ($this->driver) {
case self::PDO:
if (!$this->connection->inTransaction() && !$this->connection->beginTransaction()) {
return false;
}
break;
case self::MYSQLI:
if (!$this->connection->begin_transaction()) {
return false;
}
break;
}
$this->in_transaction = true;
return true;
}
protected function performCommit()
{
switch ($this->driver) {
case self::PDO:
if (!$this->connection->inTransaction()) {
return true;
}
return $this->connection->commit();
case self::MYSQLI:
return $this->connection->commit();
}
return true;
}
/**
* Does a commit
*
* @return boolean Was the command executed successfully?
*/
public function commit()
{
if (!$this->performCommit()) {
return false;
}
$this->in_transaction = false;
return true;
}
/**
* Does a rollback
*
* @return boolean Was the command executed successfully?
*/
public function rollback()
{
$ret = false;
switch ($this->driver) {
case self::PDO:
if (!$this->connection->inTransaction()) {
$ret = true;
break;
}
$ret = $this->connection->rollBack();
break;
case self::MYSQLI:
$ret = $this->connection->rollback();
break;
}
$this->in_transaction = false;
return $ret;
}
/**
* Build the array with the table relations
*
* The array is build from the database definitions in DBStructure.php
*
* This process must only be started once, since the value is cached.
*/
private function buildRelationData()
{
$definition = DBStructure::definition($this->configCache->get('system', 'basepath'));
foreach ($definition AS $table => $structure) {
foreach ($structure['fields'] AS $field => $field_struct) {
if (isset($field_struct['relation'])) {
foreach ($field_struct['relation'] AS $rel_table => $rel_field) {
$this->relation[$rel_table][$rel_field][$table][] = $field;
}
}
}
}
}
/**
* Delete a row from a table
*
* Note: this methods does NOT accept schema => table arrays because of the complex relation stuff.
*
* @param string $table Table name
* @param array $conditions Field condition(s)
* @param array $options
* - cascade: If true we delete records in other tables that depend on the one we're deleting through
* relations (default: true)
* @param array $callstack Internal use: prevent endless loops
*
* @return boolean was the delete successful?
* @throws \Exception
*/
public function delete($table, array $conditions, array $options = [], array &$callstack = [])
{
if (empty($table) || empty($conditions)) {
$this->logger->info('Table and conditions have to be set');
return false;
}
$commands = [];
// Create a key for the loop prevention
$key = $table . ':' . json_encode($conditions);
// We quit when this key already exists in the callstack.
if (isset($callstack[$key])) {
return true;
}
$callstack[$key] = true;
$commands[$key] = ['table' => $table, 'conditions' => $conditions];
// Don't use "defaults" here, since it would set "false" to "true"
if (isset($options['cascade'])) {
$cascade = $options['cascade'];
} else {
$cascade = true;
}
// To speed up the whole process we cache the table relations
if ($cascade && count($this->relation) == 0) {
$this->buildRelationData();
}
// Is there a relation entry for the table?
if ($cascade && isset($this->relation[$table])) {
// We only allow a simple "one field" relation.
$field = array_keys($this->relation[$table])[0];
$rel_def = array_values($this->relation[$table])[0];
// Create a key for preventing double queries
$qkey = $field . '-' . $table . ':' . json_encode($conditions);
// When the search field is the relation field, we don't need to fetch the rows
// This is useful when the leading record is already deleted in the frontend but the rest is done in the backend
if ((count($conditions) == 1) && ($field == array_keys($conditions)[0])) {
foreach ($rel_def AS $rel_table => $rel_fields) {
foreach ($rel_fields AS $rel_field) {
$this->delete($rel_table, [$rel_field => array_values($conditions)[0]], $options, $callstack);
}
}
// We quit when this key already exists in the callstack.
} elseif (!isset($callstack[$qkey])) {
$callstack[$qkey] = true;
// Fetch all rows that are to be deleted
$data = $this->select($table, [$field], $conditions);
while ($row = $this->fetch($data)) {
$this->delete($table, [$field => $row[$field]], $options, $callstack);
}
$this->close($data);
// Since we had split the delete command we don't need the original command anymore
unset($commands[$key]);
}
}
// Now we finalize the process
$do_transaction = !$this->in_transaction;
if ($do_transaction) {
$this->transaction();
}
$compacted = [];
$counter = [];
foreach ($commands AS $command) {
$conditions = $command['conditions'];
reset($conditions);
$first_key = key($conditions);
$condition_string = DBA::buildCondition($conditions);
if ((count($command['conditions']) > 1) || is_int($first_key)) {
$sql = "DELETE FROM " . DBA::quoteIdentifier($command['table']) . " " . $condition_string;
$this->logger->info($this->replaceParameters($sql, $conditions), ['callstack' => System::callstack(6), 'internal_callstack' => $callstack]);
if (!$this->e($sql, $conditions)) {
if ($do_transaction) {
$this->rollback();
}
return false;
}
} else {
$key_table = $command['table'];
$key_condition = array_keys($command['conditions'])[0];
$value = array_values($command['conditions'])[0];
// Split the SQL queries in chunks of 100 values
// We do the $i stuff here to make the code better readable
$i = isset($counter[$key_table][$key_condition]) ? $counter[$key_table][$key_condition] : 0;
if (isset($compacted[$key_table][$key_condition][$i]) && count($compacted[$key_table][$key_condition][$i]) > 100) {
++$i;
}
$compacted[$key_table][$key_condition][$i][$value] = $value;
$counter[$key_table][$key_condition] = $i;
}
}
foreach ($compacted AS $table => $values) {
foreach ($values AS $field => $field_value_list) {
foreach ($field_value_list AS $field_values) {
$sql = "DELETE FROM " . DBA::quoteIdentifier($table) . " WHERE " . DBA::quoteIdentifier($field) . " IN (" .
substr(str_repeat("?, ", count($field_values)), 0, -2) . ");";
$this->logger->info($this->replaceParameters($sql, $field_values), ['callstack' => System::callstack(6), 'internal_callstack' => $callstack]);
if (!$this->e($sql, $field_values)) {
if ($do_transaction) {
$this->rollback();
}
return false;
}
}
}
}
if ($do_transaction) {
$this->commit();
}
return true;
}
/**
* Updates rows
*
* Updates rows in the database. When $old_fields is set to an array,
* the system will only do an update if the fields in that array changed.
*
* Attention:
* Only the values in $old_fields are compared.
* This is an intentional behaviour.
*
* Example:
* We include the timestamp field in $fields but not in $old_fields.
* Then the row will only get the new timestamp when the other fields had changed.
*
* When $old_fields is set to a boolean value the system will do this compare itself.
* When $old_fields is set to "true" the system will do an insert if the row doesn't exists.
*
* Attention:
* Only set $old_fields to a boolean value when you are sure that you will update a single row.
* When you set $old_fields to "true" then $fields must contain all relevant fields!
*
* @param string|array $table Table name or array [schema => table]
* @param array $fields contains the fields that are updated
* @param array $condition condition array with the key values
* @param array|boolean $old_fields array with the old field values that are about to be replaced (true = update on duplicate)
*
* @return boolean was the update successfull?
* @throws \Exception
*/
public function update($table, $fields, $condition, $old_fields = [])
{
if (empty($table) || empty($fields) || empty($condition)) {
$this->logger->info('Table, fields and condition have to be set');
return false;
}
if (is_bool($old_fields)) {
$do_insert = $old_fields;
$old_fields = $this->selectFirst($table, [], $condition);
if (is_bool($old_fields)) {
if ($do_insert) {
$values = array_merge($condition, $fields);
return $this->replace($table, $values);
}
$old_fields = [];
}
}
foreach ($old_fields AS $fieldname => $content) {
if (isset($fields[$fieldname]) && !is_null($content) && ($fields[$fieldname] == $content)) {
unset($fields[$fieldname]);
}
}
if (count($fields) == 0) {
return true;
}
$fields = $this->castFields($table, $fields);
$table_string = DBA::buildTableString($table);
$condition_string = DBA::buildCondition($condition);
$sql = "UPDATE " . $table_string . " SET "
. implode(" = ?, ", array_map([DBA::class, 'quoteIdentifier'], array_keys($fields))) . " = ?"
. $condition_string;
// Combines the updated fields parameter values with the condition parameter values
$params = array_merge(array_values($fields), $condition);
return $this->e($sql, $params);
}
/**
* Retrieve a single record from a table and returns it in an associative array
*
* @param string|array $table
* @param array $fields
* @param array $condition
* @param array $params
*
* @return bool|array
* @throws \Exception
* @see $this->select
*/
public function selectFirst($table, array $fields = [], array $condition = [], $params = [])
{
$params['limit'] = 1;
$result = $this->select($table, $fields, $condition, $params);
if (is_bool($result)) {
return $result;
} else {
$row = $this->fetch($result);
$this->close($result);
return $row;
}
}
/**
* Select rows from a table and fills an array with the data
*
* @param string|array $table Table name or array [schema => table]
* @param array $fields Array of selected fields, empty for all
* @param array $condition Array of fields for condition
* @param array $params Array of several parameters
*
* @return array Data array
* @throws \Exception
* @see self::select
*/
public function selectToArray($table, array $fields = [], array $condition = [], array $params = [])
{
return $this->toArray($this->select($table, $fields, $condition, $params));
}
/**
* Select rows from a table
*
*
* Example:
* $table = 'post';
* or:
* $table = ['schema' => 'table'];
* @see DBA::buildTableString()
*
* $fields = ['id', 'uri', 'uid', 'network'];
*
* $condition = ['uid' => 1, 'network' => 'dspr', 'blocked' => true];
* or:
* $condition = ['`uid` = ? AND `network` IN (?, ?)', 1, 'dfrn', 'dspr'];
* @see DBA::buildCondition()
*
* $params = ['order' => ['id', 'received' => true, 'created' => 'ASC'), 'limit' => 10];
* @see DBA::buildParameter()
*
* $data = DBA::select($table, $fields, $condition, $params);
*
* @param string|array $table Table name or array [schema => table]
* @param array $fields Array of selected fields, empty for all
* @param array $condition Array of fields for condition
* @param array $params Array of several parameters
* @return boolean|object
* @throws \Exception
*/
public function select($table, array $fields = [], array $condition = [], array $params = [])
{
if (empty($table)) {
return false;
}
if (count($fields) > 0) {
$select_string = implode(', ', array_map([DBA::class, 'quoteIdentifier'], $fields));
} else {
$select_string = '*';
}
$table_string = DBA::buildTableString($table);
$condition_string = DBA::buildCondition($condition);
$param_string = DBA::buildParameter($params);
$sql = "SELECT " . $select_string . " FROM " . $table_string . $condition_string . $param_string;
$result = $this->p($sql, $condition);
if (($this->driver == self::PDO) && !empty($result) && is_string($table)) {
$result->table = $table;
}
return $result;
}
/**
* Counts the rows from a table satisfying the provided condition
*
* @param string|array $table Table name or array [schema => table]
* @param array $condition Array of fields for condition
* @param array $params Array of several parameters
*
* @return int
*
* Example:
* $table = "post";
*
* $condition = ["uid" => 1, "network" => 'dspr'];
* or:
* $condition = ["`uid` = ? AND `network` IN (?, ?)", 1, 'dfrn', 'dspr'];
*
* $count = DBA::count($table, $condition);
* @throws \Exception
*/
public function count($table, array $condition = [], array $params = [])
{
if (empty($table)) {
return false;
}
$table_string = DBA::buildTableString($table);
$condition_string = DBA::buildCondition($condition);
if (empty($params['expression'])) {
$expression = '*';
} elseif (!empty($params['distinct'])) {
$expression = "DISTINCT " . DBA::quoteIdentifier($params['expression']);
} else {
$expression = DBA::quoteIdentifier($params['expression']);
}
$sql = "SELECT COUNT(" . $expression . ") AS `count` FROM " . $table_string . $condition_string;
$row = $this->fetchFirst($sql, $condition);
// Ensure to always return either a "null" or a numeric value
return is_numeric($row['count']) ? (int)$row['count'] : $row['count'];
}
/**
* Fills an array with data from a query
*
* @param object $stmt statement object
* @param bool $do_close Close database connection after last row
* @param int $count maximum number of rows to be fetched
*
* @return array Data array
*/
public function toArray($stmt, $do_close = true, int $count = 0)
{
if (is_bool($stmt)) {
return [];
}
$data = [];
while ($row = $this->fetch($stmt)) {
$data[] = $row;
if (($count != 0) && (count($data) == $count)) {
return $data;
}
}
if ($do_close) {
$this->close($stmt);
}
return $data;
}
/**
* Cast field types according to the table definition
*
* @param string $table
* @param array $fields
* @return array casted fields
*/
public function castFields(string $table, array $fields) {
// When there is no data, we don't need to do something
if (empty($fields)) {
return $fields;
}
// We only need to cast fields with PDO
if ($this->driver != self::PDO) {
return $fields;
}
// We only need to cast when emulating the prepares
if (!$this->connection->getAttribute(PDO::ATTR_EMULATE_PREPARES)) {
return $fields;
}
$types = [];
$tables = DBStructure::definition('', false);
if (empty($tables[$table])) {
// When a matching table wasn't found we check if it is a view
$views = View::definition('', false);
if (empty($views[$table])) {
return $fields;
}
foreach(array_keys($fields) as $field) {
if (!empty($views[$table]['fields'][$field])) {
$viewdef = $views[$table]['fields'][$field];
if (!empty($tables[$viewdef[0]]['fields'][$viewdef[1]]['type'])) {
$types[$field] = $tables[$viewdef[0]]['fields'][$viewdef[1]]['type'];
}
}
}
} else {
foreach ($tables[$table]['fields'] as $field => $definition) {
$types[$field] = $definition['type'];
}
}
foreach ($fields as $field => $content) {
if (is_null($content) || empty($types[$field])) {
continue;
}
if ((substr($types[$field], 0, 7) == 'tinyint') || (substr($types[$field], 0, 8) == 'smallint') ||
(substr($types[$field], 0, 9) == 'mediumint') || (substr($types[$field], 0, 3) == 'int') ||
(substr($types[$field], 0, 6) == 'bigint') || (substr($types[$field], 0, 7) == 'boolean')) {
$fields[$field] = (int)$content;
}
if ((substr($types[$field], 0, 5) == 'float') || (substr($types[$field], 0, 6) == 'double')) {
$fields[$field] = (float)$content;
}
}
return $fields;
}
/**
* Returns the error number of the last query
*
* @return string Error number (0 if no error)
*/
public function errorNo()
{
return $this->errorno;
}
/**
* Returns the error message of the last query
*
* @return string Error message ('' if no error)
*/
public function errorMessage()
{
return $this->error;
}
/**
* Closes the current statement
*
* @param object $stmt statement object
*
* @return boolean was the close successful?
*/
public function close($stmt)
{
$stamp1 = microtime(true);
if (!is_object($stmt)) {
return false;
}
switch ($this->driver) {
case self::PDO:
$ret = $stmt->closeCursor();
break;
case self::MYSQLI:
// MySQLi offers both a mysqli_stmt and a mysqli_result class.
// We should be careful not to assume the object type of $stmt
// because DBA::p() has been able to return both types.
if ($stmt instanceof mysqli_stmt) {
$stmt->free_result();
$ret = $stmt->close();
} elseif ($stmt instanceof mysqli_result) {
$stmt->free();
$ret = true;
} else {
$ret = false;
}
break;
}
$this->profiler->saveTimestamp($stamp1, 'database');
return $ret;
}
/**
* Return a list of database processes
*
* @return array
* 'list' => List of processes, separated in their different states
* 'amount' => Number of concurrent database processes
* @throws \Exception
*/
public function processlist()
{
$ret = $this->p("SHOW PROCESSLIST");
$data = $this->toArray($ret);
$processes = 0;
$states = [];
foreach ($data as $process) {
$state = trim($process["State"]);
// Filter out all non blocking processes
if (!in_array($state, ["", "init", "statistics", "updating"])) {
++$states[$state];
++$processes;
}
}
$statelist = "";
foreach ($states as $state => $usage) {
if ($statelist != "") {
$statelist .= ", ";
}
$statelist .= $state . ": " . $usage;
}
return (["list" => $statelist, "amount" => $processes]);
}
/**
* Fetch a database variable
*
* @param string $name
* @return string content
*/
public function getVariable(string $name)
{
$result = $this->fetchFirst("SHOW GLOBAL VARIABLES WHERE `Variable_name` = ?", $name);
return $result['Value'] ?? null;
}
/**
* Checks if $array is a filled array with at least one entry.
*
* @param mixed $array A filled array with at least one entry
*
* @return boolean Whether $array is a filled array or an object with rows
*/
public function isResult($array)
{
// It could be a return value from an update statement
if (is_bool($array)) {
return $array;
}
if (is_object($array)) {
return $this->numRows($array) > 0;
}
return (is_array($array) && (count($array) > 0));
}
/**
* Callback function for "esc_array"
*
* @param mixed $value Array value
* @param string $key Array key
* @param boolean $add_quotation add quotation marks for string values
*
* @return void
*/
private function escapeArrayCallback(&$value, $key, $add_quotation)
{
if (!$add_quotation) {
if (is_bool($value)) {
$value = ($value ? '1' : '0');
} else {
$value = $this->escape($value);
}
return;
}
if (is_bool($value)) {
$value = ($value ? 'true' : 'false');
} elseif (is_float($value) || is_integer($value)) {
$value = (string)$value;
} else {
$value = "'" . $this->escape($value) . "'";
}
}
/**
* Escapes a whole array
*
* @param mixed $arr Array with values to be escaped
* @param boolean $add_quotation add quotation marks for string values
*
* @return void
*/
public function escapeArray(&$arr, $add_quotation = false)
{
array_walk($arr, [$this, 'escapeArrayCallback'], $add_quotation);
}
}
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