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<?php
/**
* Matomo - free/libre analytics platform
*
* @link https://matomo.org
* @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
*
*/
namespace Piwik;
use Exception;
use Piwik\Db\Adapter;
/**
* Contains SQL related helper functions for Piwik's MySQL database.
*
* Plugins should always use this class to execute SQL against the database.
*
* ### Examples
*
* $rows = Db::fetchAll("SELECT col1, col2 FROM mytable WHERE thing = ?", array('thingvalue'));
* foreach ($rows as $row) {
* doSomething($row['col1'], $row['col2']);
* }
*
* $value = Db::fetchOne("SELECT MAX(col1) FROM mytable");
* doSomethingElse($value);
*
* Db::query("DELETE FROM mytable WHERE id < ?", array(23));
*
* @api
*/
class Db
{
const SQL_MODE = 'NO_AUTO_VALUE_ON_ZERO';
private static $connection = null;
private static $readerConnection = null;
private static $logQueries = true;
// this is used for indicate TransactionLevel Cache
public $supportsUncommitted;
/**
* Returns the database connection and creates it if it hasn't been already.
*
* @return \Piwik\Tracker\Db|\Piwik\Db\AdapterInterface|\Piwik\Db
*/
public static function get()
{
if (\Piwik\SettingsServer::isTrackerApiRequest()) {
return \Piwik\Tracker::getDatabase();
}
if (!self::hasDatabaseObject()) {
self::createDatabaseObject();
}
return self::$connection;
}
/**
* @internal
* @ignore
* @return bool
*/
public static function hasReaderConfigured()
{
$readerConfig = \Piwik\Config::getInstance()->database_reader;
return !empty($readerConfig['host']);
}
/**
* Returns the database connection and creates it if it hasn't been already. Make sure to not write any data on
* the reader and only use the connection to read data.
*
* @since Matomo 3.12
*
* @return \Piwik\Tracker\Db|\Piwik\Db\AdapterInterface|\Piwik\Db
*/
public static function getReader()
{
if (!self::hasReaderConfigured()) {
return self::get();
}
if (!self::hasReaderDatabaseObject()) {
self::createReaderDatabaseObject();
}
return self::$readerConnection;
}
/**
* Returns an array with the Database connection information.
*
* @param array|null $dbConfig
* @return array
*/
public static function getDatabaseConfig($dbConfig = null)
{
$config = \Piwik\Config::getInstance();
if (is_null($dbConfig)) {
$dbConfig = $config->database;
}
/**
* Triggered before a database connection is established.
*
* This event can be used to change the settings used to establish a connection.
*
* @param array *$dbInfos Reference to an array containing database connection info,
* including:
*
* - **host**: The host name or IP address to the MySQL database.
* - **username**: The username to use when connecting to the
* database.
* - **password**: The password to use when connecting to the
* database.
* - **dbname**: The name of the Piwik MySQL database.
* - **port**: The MySQL database port to use.
* - **adapter**: either `'PDO\MYSQL'` or `'MYSQLI'`
* - **type**: The MySQL engine to use, for instance 'InnoDB'
*/
\Piwik\Piwik::postEvent('Db.getDatabaseConfig', array(&$dbConfig));
$dbConfig['profiler'] = @$config->Debug['enable_sql_profiler'];
return $dbConfig;
}
/**
* For tests only.
* @param $connection
* @ignore
* @internal
*/
public static function setDatabaseObject($connection)
{
self::$connection = $connection;
}
/**
* Connects to the database.
*
* Shouldn't be called directly, use {@link get()} instead.
*
* @param array|null $dbConfig Connection parameters in an array. Defaults to the `[database]`
* INI config section.
*/
public static function createDatabaseObject($dbConfig = null)
{
$dbConfig = self::getDatabaseConfig($dbConfig);
$db = @Adapter::factory($dbConfig['adapter'], $dbConfig);
self::$connection = $db;
}
/**
* Connects to the reader database.
*
* Shouldn't be called directly, use {@link get()} instead.
*
* @param array|null $dbConfig Connection parameters in an array. Defaults to the `[database]`
* INI config section.
*
* @since Matomo 3.12
*/
public static function createReaderDatabaseObject($dbConfig = null)
{
if (!isset($dbConfig)) {
$dbConfig = \Piwik\Config::getInstance()->database_reader;
}
$masterDbConfig = self::getDatabaseConfig();
$dbConfig = self::getDatabaseConfig($dbConfig);
$dbConfig['adapter'] = $masterDbConfig['adapter'];
$dbConfig['schema'] = $masterDbConfig['schema'];
$dbConfig['type'] = $masterDbConfig['type'];
$dbConfig['tables_prefix'] = $masterDbConfig['tables_prefix'];
$dbConfig['charset'] = $masterDbConfig['charset'];
$db = @Adapter::factory($dbConfig['adapter'], $dbConfig);
if (!empty($dbConfig['aurora_readonly_read_committed'])) {
$db->exec('set session aurora_read_replica_read_committed = ON;set session transaction isolation level read committed;');
}
self::$readerConnection = $db;
}
/**
* Detect whether a database object is initialized / created or not.
*
* @internal
*/
public static function hasDatabaseObject()
{
return isset(self::$connection);
}
/**
* Detect whether a database object is initialized / created or not.
*
* @internal
*/
public static function hasReaderDatabaseObject()
{
return isset(self::$readerConnection);
}
/**
* Disconnects and destroys the database connection.
*
* For tests.
*/
public static function destroyDatabaseObject()
{
if (self::hasDatabaseObject()) {
\Piwik\DbHelper::disconnectDatabase();
}
self::$connection = null;
if (self::hasReaderDatabaseObject()) {
self::$readerConnection->closeConnection();
}
self::$readerConnection = null;
}
/**
* Executes an unprepared SQL query. Recommended for DDL statements like `CREATE`,
* `DROP` and `ALTER`. The return value is DBMS-specific. For MySQLI, it returns the
* number of rows affected. For PDO, it returns a
* [Zend_Db_Statement](http://framework.zend.com/manual/1.12/en/zend.db.statement.html) object.
*
* @param string $sql The SQL query.
* @throws \Exception If there is an error in the SQL.
* @return integer|\Zend_Db_Statement
*/
public static function exec($sql)
{
/** @var \Zend_Db_Adapter_Abstract $db */
$db = self::get();
$profiler = $db->getProfiler();
$q = $profiler->queryStart($sql, \Zend_Db_Profiler::INSERT);
try {
self::logSql(__FUNCTION__, $sql);
$return = self::get()->exec($sql);
} catch (Exception $ex) {
self::logExtraInfoIfDeadlock($ex);
throw $ex;
}
$profiler->queryEnd($q);
return $return;
}
/**
* Executes an SQL query and returns the [Zend_Db_Statement](http://framework.zend.com/manual/1.12/en/zend.db.statement.html)
* for the query.
*
* This method is meant for non-query SQL statements like `INSERT` and `UPDATE. If you want to fetch
* data from the DB you should use one of the fetch... functions.
*
* @param string $sql The SQL query.
* @param array $parameters Parameters to bind in the query, eg, `array(param1 => value1, param2 => value2)`.
* @throws \Exception If there is a problem with the SQL or bind parameters.
* @return \Zend_Db_Statement
*/
public static function query($sql, $parameters = array())
{
try {
self::logSql(__FUNCTION__, $sql, $parameters);
return self::get()->query($sql, $parameters);
} catch (Exception $ex) {
self::logExtraInfoIfDeadlock($ex);
throw $ex;
}
}
/**
* Executes an SQL `SELECT` statement and returns all fetched rows from the result set.
*
* @param string $sql The SQL query.
* @param array $parameters Parameters to bind in the query, eg, `array(param1 => value1, param2 => value2)`.
* @throws \Exception If there is a problem with the SQL or bind parameters.
* @return array The fetched rows, each element is an associative array mapping column names
* with column values.
*/
public static function fetchAll($sql, $parameters = array())
{
try {
self::logSql(__FUNCTION__, $sql, $parameters);
return self::get()->fetchAll($sql, $parameters);
} catch (Exception $ex) {
self::logExtraInfoIfDeadlock($ex);
throw $ex;
}
}
/**
* Executes an SQL `SELECT` statement and returns the first row of the result set.
*
* @param string $sql The SQL query.
* @param array $parameters Parameters to bind in the query, eg, `array(param1 => value1, param2 => value2)`.
* @throws \Exception If there is a problem with the SQL or bind parameters.
* @return array The fetched row, each element is an associative array mapping column names
* with column values.
*/
public static function fetchRow($sql, $parameters = array())
{
try {
self::logSql(__FUNCTION__, $sql, $parameters);
return self::get()->fetchRow($sql, $parameters);
} catch (Exception $ex) {
self::logExtraInfoIfDeadlock($ex);
throw $ex;
}
}
/**
* Executes an SQL `SELECT` statement and returns the first column value of the first
* row in the result set.
*
* @param string $sql The SQL query.
* @param array $parameters Parameters to bind in the query, eg, `array(param1 => value1, param2 => value2)`.
* @throws \Exception If there is a problem with the SQL or bind parameters.
* @return string
*/
public static function fetchOne($sql, $parameters = array())
{
try {
self::logSql(__FUNCTION__, $sql, $parameters);
return self::get()->fetchOne($sql, $parameters);
} catch (Exception $ex) {
self::logExtraInfoIfDeadlock($ex);
throw $ex;
}
}
/**
* Executes an SQL `SELECT` statement and returns the entire result set indexed by the first
* selected field.
*
* @param string $sql The SQL query.
* @param array $parameters Parameters to bind in the query, eg, `array(param1 => value1, param2 => value2)`.
* @throws \Exception If there is a problem with the SQL or bind parameters.
* @return array eg,
* ```
* array('col1value1' => array('col2' => '...', 'col3' => ...),
* 'col1value2' => array('col2' => '...', 'col3' => ...))
* ```
*/
public static function fetchAssoc($sql, $parameters = array())
{
try {
self::logSql(__FUNCTION__, $sql, $parameters);
return self::get()->fetchAssoc($sql, $parameters);
} catch (Exception $ex) {
self::logExtraInfoIfDeadlock($ex);
throw $ex;
}
}
/**
* Deletes all desired rows in a table, while using a limit. This function will execute many
* DELETE queries until there are no more rows to delete.
*
* Use this function when you need to delete many thousands of rows from a table without
* locking the table for too long.
*
* **Example**
*
* // delete all visit rows whose ID is less than a certain value, 100000 rows at a time
* $idVisit = // ...
* Db::deleteAllRows(Common::prefixTable('log_visit'), "WHERE idvisit <= ?", "idvisit ASC", 100000, array($idVisit));
*
* @param string $table The name of the table to delete from. Must be prefixed (see {@link Piwik\Common::prefixTable()}).
* @param string $where The where clause of the query. Must include the WHERE keyword.
* @param string $orderBy The column to order by and the order by direction, eg, `idvisit ASC`.
* @param int $maxRowsPerQuery The maximum number of rows to delete per `DELETE` query.
* @param array $parameters Parameters to bind for each query.
* @return int The total number of rows deleted.
*/
public static function deleteAllRows($table, $where, $orderBy, $maxRowsPerQuery = 100000, $parameters = array())
{
$orderByClause = $orderBy ? "ORDER BY {$orderBy}" : "";
$sql = "DELETE FROM {$table} {$where} {$orderByClause}\n LIMIT " . (int) $maxRowsPerQuery;
// delete rows w/ a limit
$totalRowsDeleted = 0;
do {
$rowsDeleted = self::query($sql, $parameters)->rowCount();
$totalRowsDeleted += $rowsDeleted;
} while ($rowsDeleted >= $maxRowsPerQuery);
return $totalRowsDeleted;
}
/**
* Runs an `OPTIMIZE TABLE` query on the supplied table or tables.
*
* Tables will only be optimized if the `[General] enable_sql_optimize_queries` INI config option is
* set to **1**.
*
* @param string|array $tables The name of the table to optimize or an array of tables to optimize.
* Table names must be prefixed (see {@link Piwik\Common::prefixTable()}).
* @param bool $force If true, the `OPTIMIZE TABLE` query will be run even if InnoDB tables are being used.
* @return bool
*/
public static function optimizeTables($tables, $force = false)
{
$optimize = \Piwik\Config::getInstance()->General['enable_sql_optimize_queries'];
if (empty($optimize) && !$force) {
return false;
}
if (empty($tables)) {
return false;
}
if (!is_array($tables)) {
$tables = array($tables);
}
if (!self::isOptimizeInnoDBSupported() && !$force) {
// filter out all InnoDB tables
$myisamDbTables = array();
foreach (self::getTableStatus() as $row) {
if (strtolower($row['Engine']) == 'myisam' && in_array($row['Name'], $tables)) {
$myisamDbTables[] = $row['Name'];
}
}
$tables = $myisamDbTables;
}
if (empty($tables)) {
return false;
}
// optimize the tables
$success = true;
foreach ($tables as &$t) {
$ok = self::query('OPTIMIZE TABLE ' . $t);
if (!$ok) {
$success = false;
}
}
return $success;
}
private static function getTableStatus()
{
return \Piwik\Db::fetchAll("SHOW TABLE STATUS");
}
/**
* Drops the supplied table or tables.
*
* @param string|array $tables The name of the table to drop or an array of table names to drop.
* Table names must be prefixed (see {@link Piwik\Common::prefixTable()}).
* @return \Zend_Db_Statement
*/
public static function dropTables($tables)
{
if (!is_array($tables)) {
$tables = array($tables);
}
return self::query("DROP TABLE `" . implode('`,`', $tables) . "`");
}
/**
* Drops all tables
*/
public static function dropAllTables()
{
$tablesAlreadyInstalled = \Piwik\DbHelper::getTablesInstalled();
self::dropTables($tablesAlreadyInstalled);
}
/**
* Locks the supplied table or tables.
*
* **NOTE:** Piwik does not require the `LOCK TABLES` privilege to be available. Piwik
* should still work if it has not been granted.
*
* @param string|array $tablesToRead The table or tables to obtain 'read' locks on. Table names must
* be prefixed (see {@link Piwik\Common::prefixTable()}).
* @param string|array $tablesToWrite The table or tables to obtain 'write' locks on. Table names must
* be prefixed (see {@link Piwik\Common::prefixTable()}).
* @return \Zend_Db_Statement
*/
public static function lockTables($tablesToRead, $tablesToWrite = array())
{
if (!is_array($tablesToRead)) {
$tablesToRead = array($tablesToRead);
}
if (!is_array($tablesToWrite)) {
$tablesToWrite = array($tablesToWrite);
}
$lockExprs = array();
foreach ($tablesToWrite as $table) {
$lockExprs[] = $table . " WRITE";
}
foreach ($tablesToRead as $table) {
$lockExprs[] = $table . " READ";
}
return self::exec("LOCK TABLES " . implode(', ', $lockExprs));
}
/**
* Releases all table locks.
*
* **NOTE:** Piwik does not require the `LOCK TABLES` privilege to be available. Piwik
* should still work if it has not been granted.
*
* @return \Zend_Db_Statement
*/
public static function unlockAllTables()
{
return self::exec("UNLOCK TABLES");
}
/**
* Performs a `SELECT` statement on a table one chunk at a time and returns the first
* successfully fetched value.
*
* This function will execute a query on one set of rows in a table. If nothing
* is fetched, it will execute the query on the next set of rows and so on until
* the query returns a value.
*
* This function will break up a `SELECT into several smaller `SELECT`s and
* should be used when performing a `SELECT` that can take a long time to finish.
* Using several smaller `SELECT`s will ensure that the table will not be locked
* for too long.
*
* **Example**
*
* // find the most recent visit that is older than a certain date
* $dateStart = // ...
* $sql = "SELECT idvisit
* FROM $logVisit
* WHERE '$dateStart' > visit_last_action_time
* AND idvisit <= ?
* AND idvisit > ?
* ORDER BY idvisit DESC
* LIMIT 1";
*
* // since visits
* return Db::segmentedFetchFirst($sql, $maxIdVisit, 0, -self::$selectSegmentSize);
*
* @param string $sql The SQL to perform. The last two conditions of the `WHERE`
* expression must be as follows: `'id >= ? AND id < ?'` where
* **id** is the int id of the table.
* @param int $first The minimum ID to loop from.
* @param int $last The maximum ID to loop to.
* @param int $step The maximum number of rows to scan in one query.
* @param array $params Parameters to bind in the query, eg, `array(param1 => value1, param2 => value2)`
*
* @return string
*/
public static function segmentedFetchFirst($sql, $first, $last, $step, $params = array())
{
$result = false;
if ($step > 0) {
for ($i = $first; $result === false && $i <= $last; $i += $step) {
$result = self::fetchOne($sql, array_merge($params, array($i, $i + $step)));
}
} else {
for ($i = $first; $result === false && $i >= $last; $i += $step) {
$result = self::fetchOne($sql, array_merge($params, array($i, $i + $step)));
}
}
return $result;
}
/**
* Performs a `SELECT` on a table one chunk at a time and returns an array
* of every fetched value.
*
* This function will break up a `SELECT` query into several smaller queries by
* using only a limited number of rows at a time. It will accumulate the results
* of each smaller query and return the result.
*
* This function should be used when performing a `SELECT` that can
* take a long time to finish. Using several smaller queries will ensure that
* the table will not be locked for too long.
*
* @param string $sql The SQL to perform. The last two conditions of the `WHERE`
* expression must be as follows: `'id >= ? AND id < ?'` where
* **id** is the int id of the table.
* @param int $first The minimum ID to loop from.
* @param int $last The maximum ID to loop to.
* @param int $step The maximum number of rows to scan in one query.
* @param array $params Parameters to bind in the query, `array(param1 => value1, param2 => value2)`
* @return array An array of primitive values.
*/
public static function segmentedFetchOne($sql, $first, $last, $step, $params = array())
{
$result = array();
if ($step > 0) {
for ($i = $first; $i <= $last; $i += $step) {
$result[] = self::fetchOne($sql, array_merge($params, array($i, $i + $step)));
}
} else {
for ($i = $first; $i >= $last; $i += $step) {
$result[] = self::fetchOne($sql, array_merge($params, array($i, $i + $step)));
}
}
return $result;
}
/**
* Performs a SELECT on a table one chunk at a time and returns an array
* of every fetched row.
*
* This function will break up a `SELECT` query into several smaller queries by
* using only a limited number of rows at a time. It will accumulate the results
* of each smaller query and return the result.
*
* This function should be used when performing a `SELECT` that can
* take a long time to finish. Using several smaller queries will ensure that
* the table will not be locked for too long.
*
* @param string $sql The SQL to perform. The last two conditions of the `WHERE`
* expression must be as follows: `'id >= ? AND id < ?'` where
* **id** is the int id of the table.
* @param int $first The minimum ID to loop from.
* @param int $last The maximum ID to loop to.
* @param int $step The maximum number of rows to scan in one query.
* @param array $params Parameters to bind in the query, array( param1 => value1, param2 => value2)
* @return array An array of rows that includes the result set of every smaller
* query.
*/
public static function segmentedFetchAll($sql, $first, $last, $step, $params = array())
{
$result = array();
if ($step > 0) {
for ($i = $first; $i <= $last; $i += $step) {
$currentParams = array_merge($params, array($i, $i + $step));
$result = array_merge($result, self::fetchAll($sql, $currentParams));
}
} else {
for ($i = $first; $i >= $last; $i += $step) {
$currentParams = array_merge($params, array($i, $i + $step));
$result = array_merge($result, self::fetchAll($sql, $currentParams));
}
}
return $result;
}
/**
* Performs a `UPDATE` or `DELETE` statement on a table one chunk at a time.
*
* This function will break up a query into several smaller queries by
* using only a limited number of rows at a time.
*
* This function should be used when executing a non-query statement will
* take a long time to finish. Using several smaller queries will ensure that
* the table will not be locked for too long.
*
* @param string $sql The SQL to perform. The last two conditions of the `WHERE`
* expression must be as follows: `'id >= ? AND id < ?'` where
* **id** is the int id of the table.
* @param int $first The minimum ID to loop from.
* @param int $last The maximum ID to loop to.
* @param int $step The maximum number of rows to scan in one query.
* @param array $params Parameters to bind in the query, `array(param1 => value1, param2 => value2)`
*/
public static function segmentedQuery($sql, $first, $last, $step, $params = array())
{
if ($step > 0) {
for ($i = $first; $i <= $last; $i += $step) {
$currentParams = array_merge($params, array($i, $i + $step));
self::query($sql, $currentParams);
}
} else {
for ($i = $first; $i >= $last; $i += $step) {
$currentParams = array_merge($params, array($i, $i + $step));
self::query($sql, $currentParams);
}
}
}
/**
* Attempts to get a named lock. This function uses a timeout of 1s, but will
* retry a set number of times.
*
* @param string $lockName The lock name.
* @param int $maxRetries The max number of times to retry.
* @return bool `true` if the lock was obtained, `false` if otherwise.
* @throws \Exception if Lock name is too long
*/
public static function getDbLock($lockName, $maxRetries = 30)
{
if (strlen($lockName) > 64) {
throw new \Exception('DB lock name has to be 64 characters or less for MySQL 5.7 compatibility.');
}
/*
* the server (e.g., shared hosting) may have a low wait timeout
* so instead of a single GET_LOCK() with a 30 second timeout,
* we use a 1 second timeout and loop, to avoid losing our MySQL
* connection
*/
$sql = 'SELECT GET_LOCK(?, 1)';
$db = self::get();
while ($maxRetries > 0) {
$result = $db->fetchOne($sql, array($lockName));
if ($result == '1') {
return true;
}
$maxRetries--;
}
return false;
}
/**
* Releases a named lock.
*
* @param string $lockName The lock name.
* @return bool `true` if the lock was released, `false` if otherwise.
*/
public static function releaseDbLock($lockName)
{
$sql = 'SELECT RELEASE_LOCK(?)';
$db = self::get();
return $db->fetchOne($sql, array($lockName)) == '1';
}
/**
* Cached result of isLockprivilegeGranted function.
*
* Public so tests can simulate the situation where the lock tables privilege isn't granted.
*
* @var bool
* @ignore
*/
public static $lockPrivilegeGranted = null;
/**
* Checks whether the database user is allowed to lock tables.
*
* @return bool
*/
public static function isLockPrivilegeGranted()
{
if (is_null(self::$lockPrivilegeGranted)) {
try {
\Piwik\Db::lockTables(\Piwik\Common::prefixTable('site_url'));
\Piwik\Db::unlockAllTables();
self::$lockPrivilegeGranted = true;
} catch (Exception $ex) {
self::$lockPrivilegeGranted = false;
}
}
return self::$lockPrivilegeGranted;
}
private static function logExtraInfoIfDeadlock($ex)
{
if (!self::get()->isErrNo($ex, 1213) && !self::get()->isErrNo($ex, 1205)) {
return;
}
try {
$deadlockInfo = self::fetchAll("SHOW ENGINE INNODB STATUS");
// log using exception so backtrace appears in log output
\Piwik\Log::debug(new Exception("Encountered deadlock: " . print_r($deadlockInfo, true)));
} catch (\Exception $e) {
// 1227 Access denied; you need (at least one of) the PROCESS privilege(s) for this operation
}
}
private static function logSql($functionName, $sql, $parameters = array())
{
self::checkBoundParametersIfInDevMode($sql, $parameters);
if (self::$logQueries === false || @\Piwik\Config::getInstance()->Debug['log_sql_queries'] != 1) {
return;
}
// NOTE: at the moment we don't log parameters in order to avoid sensitive information leaks
\Piwik\Log::debug("Db::%s() executing SQL: %s", $functionName, $sql);
}
private static function checkBoundParametersIfInDevMode($sql, $parameters)
{
if (!\Piwik\Development::isEnabled()) {
return;
}
if (!is_array($parameters)) {
$parameters = [$parameters];
}
foreach ($parameters as $index => $parameter) {
if ($parameter instanceof \Piwik\Date) {
throw new \Exception("Found bound parameter (index = {$index}) is Date instance which will not work correctly in following SQL: {$sql}");
}
}
}
/**
* @param bool $enable
*/
public static function enableQueryLog($enable)
{
self::$logQueries = $enable;
}
/**
* @return boolean
*/
public static function isQueryLogEnabled()
{
return self::$logQueries;
}
public static function isOptimizeInnoDBSupported($version = null)
{
if ($version === null) {
$version = \Piwik\Db::fetchOne("SELECT VERSION()");
}
$version = strtolower($version);
if (strpos($version, "mariadb") === false) {
return false;
}
$semanticVersion = strstr($version, '-', $beforeNeedle = true);
return version_compare($semanticVersion, '10.1.1', '>=');
}
}