Friendica Communications Platform (please note that this is a clone of the repository at github, issues are handled there) https://friendi.ca
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<?php
namespace Friendica\Database;
use Friendica\Core\Config\IConfigCache;
use Friendica\Core\Logger;
use Friendica\Core\System;
use Friendica\Util\DateTimeFormat;
use Friendica\Util\Profiler;
use mysqli;
use mysqli_result;
use mysqli_stmt;
use PDO;
use PDOException;
use PDOStatement;
/**
* @class MySQL database class
*
* This class is for the low level database stuff that does driver specific things.
*/
class DBA
{
/**
* Lowest possible date value
*/
const NULL_DATE = '0001-01-01';
/**
* Lowest possible datetime value
*/
const NULL_DATETIME = '0001-01-01 00:00:00';
public static $connected = false;
/**
* @var IConfigCache
*/
private static $configCache;
/**
* @var Profiler
*/
private static $profiler;
private static $server_info = '';
private static $connection;
private static $driver;
private static $error = false;
private static $errorno = 0;
private static $affected_rows = 0;
private static $in_transaction = false;
private static $in_retrial = false;
private static $relation = [];
private static $db_serveraddr = '';
private static $db_user = '';
private static $db_pass = '';
private static $db_name = '';
private static $db_charset = '';
public static function connect(IConfigCache $configCache, Profiler $profiler, $serveraddr, $user, $pass, $db, $charset = null)
{
if (!is_null(self::$connection) && self::connected()) {
return true;
}
// We are storing these values for being able to perform a reconnect
self::$configCache = $configCache;
self::$profiler = $profiler;
self::$db_serveraddr = $serveraddr;
self::$db_user = $user;
self::$db_pass = $pass;
self::$db_name = $db;
self::$db_charset = $charset;
$port = 0;
$serveraddr = trim($serveraddr);
$serverdata = explode(':', $serveraddr);
$server = $serverdata[0];
if (count($serverdata) > 1) {
$port = trim($serverdata[1]);
}
$server = trim($server);
$user = trim($user);
$pass = trim($pass);
$db = trim($db);
$charset = trim($charset);
if (!(strlen($server) && strlen($user))) {
return false;
}
if (class_exists('\PDO') && in_array('mysql', PDO::getAvailableDrivers())) {
self::$driver = 'pdo';
$connect = "mysql:host=".$server.";dbname=".$db;
if ($port > 0) {
$connect .= ";port=".$port;
}
if ($charset) {
$connect .= ";charset=".$charset;
}
try {
self::$connection = @new PDO($connect, $user, $pass);
self::$connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
self::$connected = true;
} catch (PDOException $e) {
/// @TODO At least log exception, don't ignore it!
}
}
if (!self::$connected && class_exists('\mysqli')) {
self::$driver = 'mysqli';
if ($port > 0) {
self::$connection = @new mysqli($server, $user, $pass, $db, $port);
} else {
self::$connection = @new mysqli($server, $user, $pass, $db);
}
if (!mysqli_connect_errno()) {
self::$connected = true;
if ($charset) {
self::$connection->set_charset($charset);
}
}
}
// No suitable SQL driver was found.
if (!self::$connected) {
self::$driver = null;
self::$connection = null;
}
return self::$connected;
}
/**
* Disconnects the current database connection
*/
public static function disconnect()
{
if (is_null(self::$connection)) {
return;
}
switch (self::$driver) {
case 'pdo':
self::$connection = null;
break;
case 'mysqli':
self::$connection->close();
self::$connection = null;
break;
}
}
/**
* Perform a reconnect of an existing database connection
*/
public static function reconnect() {
self::disconnect();
$ret = self::connect(self::$configCache, self::$profiler, self::$db_serveraddr, self::$db_user, self::$db_pass, self::$db_name, self::$db_charset);
return $ret;
}
/**
* Return the database object.
* @return PDO|mysqli
*/
public static function getConnection()
{
return self::$connection;
}
/**
* @brief 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 static function serverInfo() {
if (self::$server_info == '') {
switch (self::$driver) {
case 'pdo':
self::$server_info = self::$connection->getAttribute(PDO::ATTR_SERVER_VERSION);
break;
case 'mysqli':
self::$server_info = self::$connection->server_info;
break;
}
}
return self::$server_info;
}
/**
* @brief Returns the selected database name
*
* @return string
* @throws \Exception
*/
public static function databaseName() {
$ret = self::p("SELECT DATABASE() AS `db`");
$data = self::toArray($ret);
return $data[0]['db'];
}
/**
* @brief Analyze a database query and log this if some conditions are met.
*
* @param string $query The database query that will be analyzed
* @throws \Exception
*/
private static function logIndex($query) {
if (!self::$configCache->get('system', 'db_log_index')) {
return;
}
// Don't explain an explain statement
if (strtolower(substr($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;
}
$r = self::p("EXPLAIN ".$query);
if (!self::isResult($r)) {
return;
}
$watchlist = explode(',', self::$configCache->get('system', 'db_log_index_watch'));
$blacklist = explode(',', self::$configCache->get('system', 'db_log_index_blacklist'));
while ($row = self::fetch($r)) {
if ((intval(self::$configCache->get('system', 'db_loglimit_index')) > 0)) {
$log = (in_array($row['key'], $watchlist) &&
($row['rows'] >= intval(self::$configCache->get('system', 'db_loglimit_index'))));
} else {
$log = false;
}
if ((intval(self::$configCache->get('system', 'db_loglimit_index_high')) > 0) && ($row['rows'] >= intval(self::$configCache->get('system', 'db_loglimit_index_high')))) {
$log = true;
}
if (in_array($row['key'], $blacklist) || ($row['key'] == "")) {
$log = false;
}
if ($log) {
$backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
@file_put_contents(self::$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($query, 0, 2000)."\n", FILE_APPEND);
}
}
}
public static function escape($str) {
if (self::$connected) {
switch (self::$driver) {
case 'pdo':
return substr(@self::$connection->quote($str, PDO::PARAM_STR), 1, -1);
case 'mysqli':
return @self::$connection->real_escape_string($str);
}
} else {
return str_replace("'", "\\'", $str);
}
}
public static function connected() {
$connected = false;
if (is_null(self::$connection)) {
return false;
}
switch (self::$driver) {
case 'pdo':
$r = self::p("SELECT 1");
if (self::isResult($r)) {
$row = self::toArray($r);
$connected = ($row[0]['1'] == '1');
}
break;
case 'mysqli':
$connected = self::$connection->ping();
break;
}
return $connected;
}
/**
* @brief 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 $sql An SQL string without the values
* @return string The input SQL string modified if necessary.
*/
public static function anyValueFallback($sql) {
$server_info = self::serverInfo();
if (version_compare($server_info, '5.7.5', '<') ||
(stripos($server_info, 'MariaDB') !== false)) {
$sql = str_ireplace('ANY_VALUE(', 'MIN(', $sql);
}
return $sql;
}
/**
* @brief beautifies the query - useful for "SHOW PROCESSLIST"
*
* This is safe when we bind the parameters later.
* The parameter values aren't part of the SQL.
*
* @param string $sql An SQL string without the values
* @return string The input SQL string modified if necessary.
*/
public static function cleanQuery($sql) {
$search = ["\t", "\n", "\r", " "];
$replace = [' ', ' ', ' ', ' '];
do {
$oldsql = $sql;
$sql = str_replace($search, $replace, $sql);
} while ($oldsql != $sql);
return $sql;
}
/**
* @brief Replaces the ? placeholders with the parameters in the $args array
*
* @param string $sql SQL query
* @param array $args The parameters that are to replace the ? placeholders
* @return string The replaced SQL query
*/
private static function replaceParameters($sql, $args) {
$offset = 0;
foreach ($args AS $param => $value) {
if (is_int($args[$param]) || is_float($args[$param])) {
$replace = intval($args[$param]);
} else {
$replace = "'".self::escape($args[$param])."'";
}
$pos = strpos($sql, '?', $offset);
if ($pos !== false) {
$sql = substr_replace($sql, $replace, $pos, 1);
}
$offset = $pos + strlen($replace);
}
return $sql;
}
/**
* @brief Convert parameter array to an universal form
* @param array $args Parameter array
* @return array universalized parameter array
*/
private static function getParam($args) {
unset($args[0]);
// When the second function parameter is an array then use this as the parameter array
if ((count($args) > 0) && (is_array($args[1]))) {
return $args[1];
} else {
return $args;
}
}
/**
* @brief Executes a prepared statement that returns data
* @usage Example: $r = p("SELECT * FROM `item` WHERE `guid` = ?", $guid);
*
* Please only use it with complicated queries.
* For all regular queries please use DBA::select or DBA::exists
*
* @param string $sql SQL statement
* @return bool|object statement object or result object
* @throws \Exception
*/
public static function p($sql) {
$stamp1 = microtime(true);
$params = self::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] = $param;
}
if (!self::$connected) {
return false;
}
if ((substr_count($sql, '?') != count($args)) && (count($args) > 0)) {
// Question: Should we continue or stop the query here?
Logger::log('Parameter mismatch. Query "'.$sql.'" - Parameters '.print_r($args, true), Logger::DEBUG);
}
$sql = self::cleanQuery($sql);
$sql = self::anyValueFallback($sql);
$orig_sql = $sql;
if (self::$configCache->get('system', 'db_callstack') !== null) {
$sql = "/*".System::callstack()." */ ".$sql;
}
self::$error = '';
self::$errorno = 0;
self::$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');
switch (self::$driver) {
case 'pdo':
// If there are no arguments we use "query"
if (count($args) == 0) {
if (!$retval = self::$connection->query($sql)) {
$errorInfo = self::$connection->errorInfo();
self::$error = $errorInfo[2];
self::$errorno = $errorInfo[1];
$retval = false;
break;
}
self::$affected_rows = $retval->rowCount();
break;
}
if (!$stmt = self::$connection->prepare($sql)) {
$errorInfo = self::$connection->errorInfo();
self::$error = $errorInfo[2];
self::$errorno = $errorInfo[1];
$retval = false;
break;
}
foreach ($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 = $stmt->errorInfo();
self::$error = $errorInfo[2];
self::$errorno = $errorInfo[1];
$retval = false;
} else {
$retval = $stmt;
self::$affected_rows = $retval->rowCount();
}
break;
case '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)) {
$retval = self::$connection->query(self::replaceParameters($sql, $args));
if (self::$connection->errno) {
self::$error = self::$connection->error;
self::$errorno = self::$connection->errno;
$retval = false;
} else {
if (isset($retval->num_rows)) {
self::$affected_rows = $retval->num_rows;
} else {
self::$affected_rows = self::$connection->affected_rows;
}
}
break;
}
$stmt = self::$connection->stmt_init();
if (!$stmt->prepare($sql)) {
self::$error = $stmt->error;
self::$errorno = $stmt->errno;
$retval = false;
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()) {
self::$error = self::$connection->error;
self::$errorno = self::$connection->errno;
$retval = false;
} else {
$stmt->store_result();
$retval = $stmt;
self::$affected_rows = $retval->affected_rows;
}
break;
}
// We are having an own error logging in the function "e"
if ((self::$errorno != 0) && !$called_from_e) {
// We have to preserve the error code, somewhere in the logging it get lost
$error = self::$error;
$errorno = self::$errorno;
Logger::log('DB Error '.self::$errorno.': '.self::$error."\n".
System::callstack(8)."\n".self::replaceParameters($sql, $args));
// On a lost connection we try to reconnect - but only once.
if ($errorno == 2006) {
if (self::$in_retrial || !self::reconnect()) {
// It doesn't make sense to continue when the database connection was lost
if (self::$in_retrial) {
Logger::log('Giving up retrial because of database error '.$errorno.': '.$error);
} else {
Logger::log("Couldn't reconnect after database error ".$errorno.': '.$error);
}
exit(1);
} else {
// We try it again
Logger::log('Reconnected after database error '.$errorno.': '.$error);
self::$in_retrial = true;
$ret = self::p($sql, $args);
self::$in_retrial = false;
return $ret;
}
}
self::$error = $error;
self::$errorno = $errorno;
}
self::$profiler->saveTimestamp($stamp1, 'database');
if (self::$configCache->get('system', 'db_log')) {
$stamp2 = microtime(true);
$duration = (float)($stamp2 - $stamp1);
if (($duration > self::$configCache->get('system', 'db_loglimit'))) {
$duration = round($duration, 3);
$backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
@file_put_contents(self::$configCache->get('system', 'db_log'), DateTimeFormat::utcNow()."\t".$duration."\t".
basename($backtrace[1]["file"])."\t".
$backtrace[1]["line"]."\t".$backtrace[2]["function"]."\t".
substr(self::replaceParameters($sql, $args), 0, 2000)."\n", FILE_APPEND);
}
}
return $retval;
}
/**
* @brief Executes a prepared statement like UPDATE or INSERT that doesn't return data
*
* Please use DBA::delete, DBA::insert, DBA::update, ... instead
*
* @param string $sql SQL statement
* @return boolean Was the query successfull? False is returned only if an error occurred
* @throws \Exception
*/
public static function e($sql) {
$stamp = microtime(true);
$params = self::getParam(func_get_args());
// In a case of a deadlock we are repeating the query 20 times
$timeout = 20;
do {
$stmt = self::p($sql, $params);
if (is_bool($stmt)) {
$retval = $stmt;
} elseif (is_object($stmt)) {
$retval = true;
} else {
$retval = false;
}
self::close($stmt);
} while ((self::$errorno == 1213) && (--$timeout > 0));
if (self::$errorno != 0) {
// We have to preserve the error code, somewhere in the logging it get lost
$error = self::$error;
$errorno = self::$errorno;
Logger::log('DB Error '.self::$errorno.': '.self::$error."\n".
System::callstack(8)."\n".self::replaceParameters($sql, $params));
// On a lost connection we simply quit.
// A reconnect like in self::p could be dangerous with modifications
if ($errorno == 2006) {
Logger::log('Giving up because of database error '.$errorno.': '.$error);
exit(1);
}
self::$error = $error;
self::$errorno = $errorno;
}
self::$profiler->saveTimestamp($stamp, "database_write");
return $retval;
}
/**
* @brief Check if data exists
*
* @param string $table Table name
* @param array $condition array of fields for condition
*
* @return boolean Are there rows for that condition?
* @throws \Exception
*/
public static function exists($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];
}
$stmt = self::select($table, $fields, $condition, ['limit' => 1]);
if (is_bool($stmt)) {
$retval = $stmt;
} else {
$retval = (self::numRows($stmt) > 0);
}
self::close($stmt);
return $retval;
}
/**
* Fetches the first row
*
* Please use DBA::selectFirst or DBA::exists whenever this is possible.
*
* @brief Fetches the first row
* @param string $sql SQL statement
* @return array first row of query
* @throws \Exception
*/
public static function fetchFirst($sql) {
$params = self::getParam(func_get_args());
$stmt = self::p($sql, $params);
if (is_bool($stmt)) {
$retval = $stmt;
} else {
$retval = self::fetch($stmt);
}
self::close($stmt);
return $retval;
}
/**
* @brief Returns the number of affected rows of the last statement
*
* @return int Number of rows
*/
public static function affectedRows() {
return self::$affected_rows;
}
/**
* @brief Returns the number of columns of a statement
*
* @param object Statement object
* @return int Number of columns
*/
public static function columnCount($stmt) {
if (!is_object($stmt)) {
return 0;
}
switch (self::$driver) {
case 'pdo':
return $stmt->columnCount();
case 'mysqli':
return $stmt->field_count;
}
return 0;
}
/**
* @brief Returns the number of rows of a statement
*
* @param PDOStatement|mysqli_result|mysqli_stmt Statement object
* @return int Number of rows
*/
public static function numRows($stmt) {
if (!is_object($stmt)) {
return 0;
}
switch (self::$driver) {
case 'pdo':
return $stmt->rowCount();
case 'mysqli':
return $stmt->num_rows;
}
return 0;
}
/**
* @brief Fetch a single row
*
* @param mixed $stmt statement object
* @return array current row
*/
public static function fetch($stmt) {
$stamp1 = microtime(true);
$columns = [];
if (!is_object($stmt)) {
return false;
}
switch (self::$driver) {
case 'pdo':
$columns = $stmt->fetch(PDO::FETCH_ASSOC);
break;
case 'mysqli':
if (get_class($stmt) == 'mysqli_result') {
$columns = $stmt->fetch_assoc();
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] = $col;
}
}
self::$profiler->saveTimestamp($stamp1, 'database');
return $columns;
}
/**
* @brief Insert a row into a table
*
* @param string $table Table name
* @param array $param parameter array
* @param bool $on_duplicate_update Do an update on a duplicate entry
*
* @return boolean was the insert successful?
* @throws \Exception
*/
public static function insert($table, $param, $on_duplicate_update = false) {
if (empty($table) || empty($param)) {
Logger::log('Table and fields have to be set');
return false;
}
$sql = "INSERT INTO `".self::escape($table)."` (`".implode("`, `", array_keys($param))."`) VALUES (".
substr(str_repeat("?, ", count($param)), 0, -2).")";
if ($on_duplicate_update) {
$sql .= " ON DUPLICATE KEY UPDATE `".implode("` = ?, `", array_keys($param))."` = ?";
$values = array_values($param);
$param = array_merge_recursive($values, $values);
}
return self::e($sql, $param);
}
/**
* @brief Fetch the id of the last insert command
*
* @return integer Last inserted id
*/
public static function lastInsertId() {
switch (self::$driver) {
case 'pdo':
$id = self::$connection->lastInsertId();
break;
case 'mysqli':
$id = self::$connection->insert_id;
break;
}
return $id;
}
/**
* @brief Locks a table for exclusive write access
*
* This function can be extended in the future to accept a table array as well.
*
* @param string $table Table name
*
* @return boolean was the lock successful?
* @throws \Exception
*/
public static function lock($table) {
// See here: https://dev.mysql.com/doc/refman/5.7/en/lock-tables-and-transactions.html
if (self::$driver == 'pdo') {
self::e("SET autocommit=0");
self::$connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, true);
} else {
self::$connection->autocommit(false);
}
$success = self::e("LOCK TABLES `".self::escape($table)."` WRITE");
if (self::$driver == 'pdo') {
self::$connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
}
if (!$success) {
if (self::$driver == 'pdo') {
self::e("SET autocommit=1");
} else {
self::$connection->autocommit(true);
}
} else {
self::$in_transaction = true;
}
return $success;
}
/**
* @brief Unlocks all locked tables
*
* @return boolean was the unlock successful?
* @throws \Exception
*/
public static function unlock() {
// See here: https://dev.mysql.com/doc/refman/5.7/en/lock-tables-and-transactions.html
self::performCommit();
if (self::$driver == 'pdo') {
self::$connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, true);
}
$success = self::e("UNLOCK TABLES");
if (self::$driver == 'pdo') {
self::$connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
self::e("SET autocommit=1");
} else {
self::$connection->autocommit(true);
}
self::$in_transaction = false;
return $success;
}
/**
* @brief Starts a transaction
*
* @return boolean Was the command executed successfully?
*/
public static function transaction() {
if (!self::performCommit()) {
return false;
}
switch (self::$driver) {
case 'pdo':
if (!self::$connection->inTransaction() && !self::$connection->beginTransaction()) {
return false;
}
break;
case 'mysqli':
if (!self::$connection->begin_transaction()) {
return false;
}
break;
}
self::$in_transaction = true;
return true;
}
private static function performCommit()
{
switch (self::$driver) {
case 'pdo':
if (!self::$connection->inTransaction()) {
return true;
}
return self::$connection->commit();
case 'mysqli':
return self::$connection->commit();
}
return true;
}
/**
* @brief Does a commit
*
* @return boolean Was the command executed successfully?
*/
public static function commit() {
if (!self::performCommit()) {
return false;
}
self::$in_transaction = false;
return true;
}
/**
* @brief Does a rollback
*
* @return boolean Was the command executed successfully?
*/
public static function rollback() {
$ret = false;
switch (self::$driver) {
case 'pdo':
if (!self::$connection->inTransaction()) {
$ret = true;
break;
}
$ret = self::$connection->rollBack();
break;
case 'mysqli':
$ret = self::$connection->rollback();
break;
}
self::$in_transaction = false;
return $ret;
}
/**
* @brief 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 static function buildRelationData() {
$definition = DBStructure::definition(self::$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 => $rel_field) {
self::$relation[$rel_table][$rel_field][$table][] = $field;
}
}
}
}
}
/**
* @brief Delete a row from a table
*
* @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 $callstack Internal use: prevent endless loops
*
* @return boolean was the delete successful?
* @throws \Exception
*/
public static function delete($table, array $conditions, array $options = [], array &$callstack = [])
{
if (empty($table) || empty($conditions)) {
Logger::log('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 $commands;
}
$callstack[$key] = true;
$table = self::escape($table);
$commands[$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(self::$relation) == 0) {
self::buildRelationData();
}
// Is there a relation entry for the table?
if ($cascade && isset(self::$relation[$table])) {
// We only allow a simple "one field" relation.
$field = array_keys(self::$relation[$table])[0];
$rel_def = array_values(self::$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 $rel_field) {
self::delete($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
$data = self::select($table, [$field], $conditions);
while ($row = self::fetch($data)) {
self::delete($table, [$field => $row[$field]], $options, $callstack);
}
self::close($data);
// Since we had split the delete command we don't need the original command anymore
unset($commands[$key]);
}
}
// Now we finalize the process
$do_transaction = !self::$in_transaction;
if ($do_transaction) {
self::transaction();
}
$compacted = [];
$counter = [];
foreach ($commands AS $command) {
$conditions = $command['conditions'];
reset($conditions);
$first_key = key($conditions);
$condition_string = self::buildCondition($conditions);
if ((count($command['conditions']) > 1) || is_int($first_key)) {
$sql = "DELETE FROM `" . $command['table'] . "`" . $condition_string;
Logger::log(self::replaceParameters($sql, $conditions), Logger::DATA);
if (!self::e($sql, $conditions)) {
if ($do_transaction) {
self::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 `" . $table . "` WHERE `" . $field . "` IN (" .
substr(str_repeat("?, ", count($field_values)), 0, -2) . ");";
Logger::log(self::replaceParameters($sql, $field_values), Logger::DATA);
if (!self::e($sql, $field_values)) {
if ($do_transaction) {
self::rollback();
}
return false;
}
}
}
}
if ($do_transaction) {
self::commit();
}
return true;
}
/**
* @brief 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 $table Table name
* @param array $fields contains the fields that are updated
* @param array $condition condition array with the key values
* @param array|boolean $old_fields array with the old field values that are about to be replaced (true = update on duplicate)
*
* @return boolean was the update successfull?
* @throws \Exception
*/
public static function update($table, $fields, $condition, $old_fields = []) {
if (empty($table) || empty($fields) || empty($condition)) {
Logger::log('Table, fields and condition have to be set');
return false;
}
$table = self::escape($table);
$condition_string = self::buildCondition($condition);
if (is_bool($old_fields)) {
$do_insert = $old_fields;
$old_fields = self::selectFirst($table, [], $condition);
if (is_bool($old_fields)) {
if ($do_insert) {
$values = array_merge($condition, $fields);
return self::insert($table, $values, $do_insert);
}
$old_fields = [];
}
}
$do_update = (count($old_fields) == 0);
foreach ($old_fields AS $fieldname => $content) {
if (isset($fields[$fieldname])) {
if (($fields[$fieldname] == $content) && !is_null($content)) {
unset($fields[$fieldname]);
} else {
$do_update = true;
}
}
}
if (!$do_update || (count($fields) == 0)) {
return true;
}
$sql = "UPDATE `".$table."` SET `".
implode("` = ?, `", array_keys($fields))."` = ?".$condition_string;
$params1 = array_values($fields);
$params2 = array_values($condition);
$params = array_merge_recursive($params1, $params2);
return self::e($sql, $params);
}
/**
* Retrieve a single record from a table and returns it in an associative array
*
* @brief Retrieve a single record from a table
* @param string $table
* @param array $fields
* @param array $condition
* @param array $params
* @return bool|array
* @throws \Exception
* @see self::select
*/
public static function selectFirst($table, array $fields = [], array $condition = [], $params = [])
{
$params['limit'] = 1;
$result = self::select($table, $fields, $condition, $params);
if (is_bool($result)) {
return $result;
} else {
$row = self::fetch($result);
self::close($result);
return $row;
}
}
/**
* @brief Select rows from a table
*
* @param string $table Table name
* @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
*
* Example:
* $table = "item";
* $fields = array("id", "uri", "uid", "network");
*
* $condition = array("uid" => 1, "network" => 'dspr');
* or:
* $condition = array("`uid` = ? AND `network` IN (?, ?)", 1, 'dfrn', 'dspr');
*
* $params = array("order" => array("id", "received" => true), "limit" => 10);
*
* $data = DBA::select($table, $fields, $condition, $params);
* @throws \Exception
*/
public static function select($table, array $fields = [], array $condition = [], array $params = [])
{
if ($table == '') {
return false;
}
$table = self::escape($table);
if (count($fields) > 0) {
$select_fields = "`" . implode("`, `", array_values($fields)) . "`";
} else {
$select_fields = "*";
}
$condition_string = self::buildCondition($condition);
$param_string = self::buildParameter($params);
$sql = "SELECT " . $select_fields . " FROM `" . $table . "`" . $condition_string . $param_string;
$result = self::p($sql, $condition);
return $result;
}
/**
* @brief Counts the rows from a table satisfying the provided condition
*
* @param string $table Table name
* @param array $condition array of fields for condition
*
* @return int
*
* Example:
* $table = "item";
*
* $condition = ["uid" => 1, "network" => 'dspr'];
* or:
* $condition = ["`uid` = ? AND `network` IN (?, ?)", 1, 'dfrn', 'dspr'];
*
* $count = DBA::count($table, $condition);
* @throws \Exception
*/
public static function count($table, array $condition = [])
{
if ($table == '') {
return false;
}
$condition_string = self::buildCondition($condition);
$sql = "SELECT COUNT(*) AS `count` FROM `".$table."`".$condition_string;
$row = self::fetchFirst($sql, $condition);
return $row['count'];
}
/**
* @brief Returns the SQL condition string built from the provided condition array
*
* This function operates with two modes.
* - Supplied with a filed/value associative array, it builds simple strict
* equality conditions linked by AND.
* - Supplied with a flat list, the first element is the condition string and
* the following arguments are the values to be interpolated
*
* $condition = ["uid" => 1, "network" => 'dspr'];
* or:
* $condition = ["`uid` = ? AND `network` IN (?, ?)", 1, 'dfrn', 'dspr'];
*
* In either case, the provided array is left with the parameters only
*
* @param array $condition
* @return string
*/
public static function buildCondition(array &$condition = [])
{
$condition_string = '';
if (count($condition) > 0) {
reset($condition);
$first_key = key($condition);
if (is_int($first_key)) {
$condition_string = " WHERE (" . array_shift($condition) . ")";
} else {
$new_values = [];
$condition_string = "";
foreach ($condition as $field => $value) {
if ($condition_string != "") {
$condition_string .= " AND ";
}
if (is_array($value)) {
/* Workaround for MySQL Bug #64791.
* Never mix data types inside any IN() condition.
* In case of mixed types, cast all as string.
* Logic needs to be consistent with DBA::p() data types.
*/
$is_int = false;
$is_alpha = false;
foreach ($value as $single_value) {
if (is_int($single_value)) {
$is_int = true;
} else {
$is_alpha = true;
}
}
if ($is_int && $is_alpha) {
foreach ($value as &$ref) {
if (is_int($ref)) {
$ref = (string)$ref;
}
}
unset($ref); //Prevent accidental re-use.
}
$new_values = array_merge($new_values, array_values($value));
$placeholders = substr(str_repeat("?, ", count($value)), 0, -2);
$condition_string .= "`" . $field . "` IN (" . $placeholders . ")";
} else {
$new_values[$field] = $value;
$condition_string .= "`" . $field . "` = ?";
}
}
$condition_string = " WHERE (" . $condition_string . ")";
$condition = $new_values;
}
}
return $condition_string;
}
/**
* @brief Returns the SQL parameter string built from the provided parameter array
*
* @param array $params
* @return string
*/
public static function buildParameter(array $params = [])
{
$order_string = '';
if (isset($params['order'])) {
$order_string = " ORDER BY ";
foreach ($params['order'] AS $fields => $order) {
if (!is_int($fields)) {
$order_string .= "`" . $fields . "` " . ($order ? "DESC" : "ASC") . ", ";
} else {
$order_string .= "`" . $order . "`, ";
}
}
$order_string = substr($order_string, 0, -2);
}
$limit_string = '';
if (isset($params['limit']) && is_int($params['limit'])) {
$limit_string = " LIMIT " . intval($params['limit']);
}
if (isset($params['limit']) && is_array($params['limit'])) {
$limit_string = " LIMIT " . intval($params['limit'][0]) . ", " . intval($params['limit'][1]);
}
return $order_string.$limit_string;
}
/**
* @brief Fills an array with data from a query
*
* @param object $stmt statement object
* @param bool $do_close
* @return array Data array
*/
public static function toArray($stmt, $do_close = true) {
if (is_bool($stmt)) {
return $stmt;
}
$data = [];
while ($row = self::fetch($stmt)) {
$data[] = $row;
}
if ($do_close) {
self::close($stmt);
}
return $data;
}
/**
* @brief Returns the error number of the last query
*
* @return string Error number (0 if no error)
*/
public static function errorNo() {
return self::$errorno;
}
/**
* @brief Returns the error message of the last query
*
* @return string Error message ('' if no error)
*/
public static function errorMessage() {
return self::$error;
}
/**
* @brief Closes the current statement
*
* @param object $stmt statement object
* @return boolean was the close successful?
*/
public static function close($stmt) {
$stamp1 = microtime(true);
if (!is_object($stmt)) {
return false;
}
switch (self::$driver) {
case 'pdo':
$ret = $stmt->closeCursor();
break;
case '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 {
$ret = false;
}
break;
}
self::$profiler->saveTimestamp($stamp1, 'database');
return $ret;
}
/**
* @brief 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 static function processlist()
{
$ret = self::p("SHOW PROCESSLIST");
$data = self::toArray($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]);
}
/**
* 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 $array is a filled array or an object with rows
*/
public static function isResult($array)
{
// It could be a return value from an update statement
if (is_bool($array)) {
return $array;
}
if (is_object($array)) {
return self::numRows($array) > 0;
}
return (is_array($array) && (count($array) > 0));
}
/**
* @brief Callback function for "esc_array"
*
* @param mixed $value Array value
* @param string $key Array key
* @param boolean $add_quotation add quotation marks for string values
* @return void
*/
private static function escapeArrayCallback(&$value, $key, $add_quotation)
{
if (!$add_quotation) {
if (is_bool($value)) {
$value = ($value ? '1' : '0');
} else {
$value = self::escape($value);
}
return;
}
if (is_bool($value)) {
$value = ($value ? 'true' : 'false');
} elseif (is_float($value) || is_integer($value)) {
$value = (string) $value;
} else {
$value = "'" . self::escape($value) . "'";
}
}
/**
* @brief Escapes a whole array
*
* @param mixed $arr Array with values to be escaped
* @param boolean $add_quotation add quotation marks for string values
* @return void
*/
public static function escapeArray(&$arr, $add_quotation = false)
{
array_walk($arr, 'self::escapeArrayCallback', $add_quotation);
}
}