X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FDatabase%2FDatabase.php;h=fde5bd9f10133b20fd63f8bc4a12add3a8e77d99;hb=da66730e4f142c3557cdf7343bc420f7b80c883e;hp=5b488e11f1543e18b80d9071f14e908a2716afa6;hpb=71a0c52dc338213f81a17e95ef166d56f2d6bc40;p=friendica.git

diff --git a/src/Database/Database.php b/src/Database/Database.php
index 5b488e11f1..fde5bd9f10 100644
--- a/src/Database/Database.php
+++ b/src/Database/Database.php
@@ -1,6 +1,6 @@
 <?php
 /**
- * @copyright Copyright (C) 2010-2021, the Friendica project
+ * @copyright Copyright (C) 2010-2022, the Friendica project
  *
  * @license GNU AGPL version 3 or any later version
  *
@@ -21,11 +21,14 @@
 
 namespace Friendica\Database;
 
-use Friendica\Core\Config\Cache;
+use Friendica\Core\Config\ValueObject\Cache;
 use Friendica\Core\System;
-use Friendica\Network\HTTPException\InternalServerErrorException;
+use Friendica\Database\Definition\DbaDefinition;
+use Friendica\Database\Definition\ViewDefinition;
+use Friendica\Network\HTTPException\ServiceUnavailableException;
 use Friendica\Util\DateTimeFormat;
 use Friendica\Util\Profiler;
+use InvalidArgumentException;
 use mysqli;
 use mysqli_result;
 use mysqli_stmt;
@@ -49,7 +52,7 @@ class Database
 	protected $connected = false;
 
 	/**
-	 * @var Cache
+	 * @var \Friendica\Core\Config\ValueObject\Cache
 	 */
 	protected $configCache;
 	/**
@@ -63,32 +66,38 @@ class Database
 	protected $server_info    = '';
 	/** @var PDO|mysqli */
 	protected $connection;
-	protected $driver;
+	protected $driver = '';
 	protected $pdo_emulate_prepares = false;
-	private $error          = false;
+	private $error          = '';
 	private $errorno        = 0;
 	private $affected_rows  = 0;
 	protected $in_transaction = false;
 	protected $in_retrial     = false;
 	protected $testmode       = false;
 	private $relation       = [];
+	/** @var DbaDefinition */
+	protected $dbaDefinition;
+	/** @var ViewDefinition */
+	protected $viewDefinition;
 
-	public function __construct(Cache $configCache, Profiler $profiler, LoggerInterface $logger)
+	public function __construct(Cache $configCache, Profiler $profiler, DbaDefinition $dbaDefinition, ViewDefinition $viewDefinition, LoggerInterface $logger)
 	{
 		// We are storing these values for being able to perform a reconnect
-		$this->configCache   = $configCache;
-		$this->profiler      = $profiler;
-		$this->logger        = $logger;
+		$this->configCache    = $configCache;
+		$this->profiler       = $profiler;
+		$this->logger         = $logger;
+		$this->dbaDefinition  = $dbaDefinition;
+		$this->viewDefinition = $viewDefinition;
 
 		$this->connect();
-
-		if ($this->isConnected()) {
-			// Loads DB_UPDATE_VERSION constant
-			DBStructure::definition($configCache->get('system', 'basepath'), false);
-		}
 	}
 
-	public function connect()
+	/**
+	 * Tries to connect to database
+	 *
+	 * @return bool Success
+	 */
+	public function connect(): bool
 	{
 		if (!is_null($this->connection) && $this->connected()) {
 			return $this->connected;
@@ -114,6 +123,7 @@ class Database
 		$pass    = trim($this->configCache->get('database', 'password'));
 		$db      = trim($this->configCache->get('database', 'database'));
 		$charset = trim($this->configCache->get('database', 'charset'));
+		$socket  = trim($this->configCache->get('database', 'socket')); 
 
 		if (!(strlen($server) && strlen($user))) {
 			return false;
@@ -135,9 +145,14 @@ class Database
 				$connect .= ";charset=" . $charset;
 			}
 
+			if ($socket) {
+				$connect .= ";$unix_socket=" . $socket;
+			}
+
 			try {
 				$this->connection = @new PDO($connect, $user, $pass, [PDO::ATTR_PERSISTENT => $persistent]);
 				$this->connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, $this->pdo_emulate_prepares);
+				$this->connection->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_SILENT);
 				$this->connected = true;
 			} catch (PDOException $e) {
 				$this->connected = false;
@@ -159,12 +174,17 @@ class Database
 				if ($charset) {
 					$this->connection->set_charset($charset);
 				}
+
+				if ($socket) {
+					$this->connection->set_socket($socket);
+				}
+
 			}
 		}
 
 		// No suitable SQL driver was found.
 		if (!$this->connected) {
-			$this->driver     = null;
+			$this->driver     = '';
 			$this->connection = null;
 		}
 
@@ -216,7 +236,7 @@ class Database
 			}
 		}
 
-		$this->driver    = null;
+		$this->driver    = '';
 		$this->connected = false;
 	}
 
@@ -244,7 +264,7 @@ class Database
 	 *
 	 * @return string with either "pdo" or "mysqli"
 	 */
-	public function getDriver()
+	public function getDriver(): string
 	{
 		return $this->driver;
 	}
@@ -255,9 +275,9 @@ class Database
 	 * This function discriminate between the deprecated mysql API and the current
 	 * object-oriented mysqli API. Example of returned string: 5.5.46-0+deb8u1
 	 *
-	 * @return string
+	 * @return string Database server information
 	 */
-	public function serverInfo()
+	public function serverInfo(): string
 	{
 		if ($this->server_info == '') {
 			switch ($this->driver) {
@@ -275,10 +295,10 @@ class Database
 	/**
 	 * Returns the selected database name
 	 *
-	 * @return string
+	 * @return string Database name
 	 * @throws \Exception
 	 */
-	public function databaseName()
+	public function databaseName(): string
 	{
 		$ret  = $this->p("SELECT DATABASE() AS `db`");
 		$data = $this->toArray($ret);
@@ -289,10 +309,10 @@ class Database
 	 * Analyze a database query and log this if some conditions are met.
 	 *
 	 * @param string $query The database query that will be analyzed
-	 *
+	 * @return void
 	 * @throws \Exception
 	 */
-	private function logIndex($query)
+	private function logIndex(string $query)
 	{
 
 		if (!$this->configCache->get('system', 'db_log_index')) {
@@ -348,11 +368,10 @@ class Database
 	 * Removes every not allowlisted character from the identifier string
 	 *
 	 * @param string $identifier
-	 *
 	 * @return string sanitized identifier
 	 * @throws \Exception
 	 */
-	private function sanitizeIdentifier($identifier)
+	private function sanitizeIdentifier(string $identifier): string
 	{
 		return preg_replace('/[^A-Za-z0-9_\-]+/', '', $identifier);
 	}
@@ -372,11 +391,21 @@ class Database
 		}
 	}
 
-	public function isConnected()
+	/**
+	 * Returns connected flag
+	 *
+	 * @return bool Whether connection to database was success
+	 */
+	public function isConnected(): bool
 	{
 		return $this->connected;
 	}
 
+	/**
+	 * Checks connection status
+	 *
+	 * @return bool Whether connection to database was success
+	 */
 	public function connected()
 	{
 		$connected = false;
@@ -413,7 +442,7 @@ class Database
 	 *
 	 * @return string The input SQL string modified if necessary.
 	 */
-	public function anyValueFallback($sql)
+	public function anyValueFallback(string $sql): string
 	{
 		$server_info = $this->serverInfo();
 		if (version_compare($server_info, '5.7.5', '<') ||
@@ -431,10 +460,10 @@ class Database
 	 *
 	 * @return string The replaced SQL query
 	 */
-	private function replaceParameters($sql, $args)
+	private function replaceParameters(string $sql, array $args): string
 	{
 		$offset = 0;
-		foreach ($args AS $param => $value) {
+		foreach ($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[$param])) {
@@ -465,7 +494,7 @@ class Database
 	 * @return bool|object statement object or result object
 	 * @throws \Exception
 	 */
-	public function p($sql)
+	public function p(string $sql)
 	{
 
 		$this->profiler->startRecording('database');
@@ -476,7 +505,7 @@ class Database
 		// Renumber the array keys to be sure that they fit
 		$i    = 0;
 		$args = [];
-		foreach ($params AS $param) {
+		foreach ($params as $param) {
 			// Avoid problems with some MySQL servers and boolean values. See issue #3645
 			if (is_bool($param)) {
 				$param = (int)$param;
@@ -520,7 +549,7 @@ class Database
 		$called_from_e = ($called_from['function'] == 'e');
 
 		if (!isset($this->connection)) {
-			throw new InternalServerErrorException('The Connection is empty, although connected is set true.');
+			throw new ServiceUnavailableException('The Connection is empty, although connected is set true.');
 		}
 
 		switch ($this->driver) {
@@ -529,8 +558,8 @@ class Database
 				if (count($args) == 0) {
 					if (!$retval = $this->connection->query($this->replaceParameters($sql, $args))) {
 						$errorInfo     = $this->connection->errorInfo();
-						$this->error   = $errorInfo[2];
-						$this->errorno = $errorInfo[1];
+						$this->error   = (string)$errorInfo[2];
+						$this->errorno = (int)$errorInfo[1];
 						$retval        = false;
 						$is_error      = true;
 						break;
@@ -542,26 +571,28 @@ class Database
 				/** @var $stmt mysqli_stmt|PDOStatement */
 				if (!$stmt = $this->connection->prepare($sql)) {
 					$errorInfo     = $this->connection->errorInfo();
-					$this->error   = $errorInfo[2];
-					$this->errorno = $errorInfo[1];
+					$this->error   = (string)$errorInfo[2];
+					$this->errorno = (int)$errorInfo[1];
 					$retval        = false;
 					$is_error      = true;
 					break;
 				}
 
-				foreach ($args AS $param => $value) {
+				foreach (array_keys($args) as $param) {
+					$data_type = PDO::PARAM_STR;
 					if (is_int($args[$param])) {
 						$data_type = PDO::PARAM_INT;
-					} else {
-						$data_type = PDO::PARAM_STR;
+					} elseif ($args[$param] !== null) {
+						$args[$param] = (string)$args[$param];
 					}
+
 					$stmt->bindParam($param, $args[$param], $data_type);
 				}
 
 				if (!$stmt->execute()) {
 					$errorInfo     = $stmt->errorInfo();
-					$this->error   = $errorInfo[2];
-					$this->errorno = $errorInfo[1];
+					$this->error   = (string)$errorInfo[2];
+					$this->errorno = (int)$errorInfo[1];
 					$retval        = false;
 					$is_error      = true;
 				} else {
@@ -579,8 +610,8 @@ class Database
 				if (!$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;
+						$this->error   = (string)$this->connection->error;
+						$this->errorno = (int)$this->connection->errno;
 						$retval        = false;
 						$is_error      = true;
 					} else {
@@ -596,8 +627,8 @@ class Database
 				$stmt = $this->connection->stmt_init();
 
 				if (!$stmt->prepare($sql)) {
-					$this->error   = $stmt->error;
-					$this->errorno = $stmt->errno;
+					$this->error   = (string)$stmt->error;
+					$this->errorno = (int)$stmt->errno;
 					$retval        = false;
 					$is_error      = true;
 					break;
@@ -605,13 +636,16 @@ class Database
 
 				$param_types = '';
 				$values      = [];
-				foreach ($args AS $param => $value) {
+				foreach (array_keys($args) as $param) {
 					if (is_int($args[$param])) {
 						$param_types .= 'i';
 					} elseif (is_float($args[$param])) {
 						$param_types .= 'd';
 					} elseif (is_string($args[$param])) {
 						$param_types .= 's';
+					} elseif (is_object($args[$param]) && method_exists($args[$param], '__toString')) {
+						$param_types .= 's';
+						$args[$param] = (string)$args[$param];
 					} else {
 						$param_types .= 'b';
 					}
@@ -624,8 +658,8 @@ class Database
 				}
 
 				if (!$stmt->execute()) {
-					$this->error   = $this->connection->error;
-					$this->errorno = $this->connection->errno;
+					$this->error   = (string)$this->connection->error;
+					$this->errorno = (int)$this->connection->errno;
 					$retval        = false;
 					$is_error      = true;
 				} else {
@@ -692,8 +726,8 @@ class Database
 				}
 			}
 
-			$this->error   = $error;
-			$this->errorno = $errorno;
+			$this->error   = (string)$error;
+			$this->errorno = (int)$errorno;
 		}
 
 		$this->profiler->stopRecording();
@@ -725,8 +759,9 @@ class Database
 	 * @return boolean Was the query successfull? False is returned only if an error occurred
 	 * @throws \Exception
 	 */
-	public function e($sql)
+	public function e(string $sql): bool
 	{
+		$retval = false;
 
 		$this->profiler->startRecording('database_write');
 
@@ -788,13 +823,14 @@ class Database
 	/**
 	 * Check if data exists
 	 *
-	 * @param string|array $table     Table name or array [schema => table]
-	 * @param array        $condition array of fields for condition
+	 * @param string $table     Table name in format schema.table (while scheme is optiona)
+	 * @param array  $condition Array of fields for condition
 	 *
 	 * @return boolean Are there rows for that condition?
 	 * @throws \Exception
+	 * @todo Please unwrap the DBStructure::existsTable() call so this method has one behavior only: checking existence on records
 	 */
-	public function exists($table, $condition)
+	public function exists(string $table, array $condition): bool
 	{
 		if (empty($table)) {
 			return false;
@@ -834,10 +870,10 @@ class Database
 	 *
 	 * @param string $sql SQL statement
 	 *
-	 * @return array first row of query
+	 * @return array|bool first row of query or false on failure
 	 * @throws \Exception
 	 */
-	public function fetchFirst($sql)
+	public function fetchFirst(string $sql)
 	{
 		$params = DBA::getParam(func_get_args());
 
@@ -859,7 +895,7 @@ class Database
 	 *
 	 * @return int Number of rows
 	 */
-	public function affectedRows()
+	public function affectedRows(): int
 	{
 		return $this->affected_rows;
 	}
@@ -871,7 +907,7 @@ class Database
 	 *
 	 * @return int Number of columns
 	 */
-	public function columnCount($stmt)
+	public function columnCount($stmt): int
 	{
 		if (!is_object($stmt)) {
 			return 0;
@@ -892,7 +928,7 @@ class Database
 	 *
 	 * @return int Number of rows
 	 */
-	public function numRows($stmt)
+	public function numRows($stmt): int
 	{
 		if (!is_object($stmt)) {
 			return 0;
@@ -909,9 +945,9 @@ class Database
 	/**
 	 * Fetch a single row
 	 *
-	 * @param PDOStatement|mysqli_stmt $stmt statement object
+	 * @param bool|PDOStatement|mysqli_stmt $stmt statement object
 	 *
-	 * @return array|false current row
+	 * @return array|bool Current row or false on failure
 	 */
 	public function fetch($stmt)
 	{
@@ -958,7 +994,7 @@ class Database
 				$result = $stmt->result_metadata();
 				$fields = $result->fetch_fields();
 
-				foreach ($cols_num AS $param => $col) {
+				foreach ($cols_num as $param => $col) {
 					$columns[$fields[$param]->name] = $col;
 				}
 		}
@@ -969,16 +1005,16 @@ class Database
 	}
 
 	/**
-	 * Insert a row into a table
+	 * Insert a row into a table. Field value objects will be cast as string.
 	 *
-	 * @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
+	 * @param string $table          Table name in format schema.table (while scheme is optiona)
+	 * @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)
+	public function insert(string $table, array $param, int $duplicate_mode = self::INSERT_DEFAULT): bool
 	{
 		if (empty($table) || empty($param)) {
 			$this->logger->info('Table and fields have to be set');
@@ -987,7 +1023,7 @@ class Database
 
 		$param = $this->castFields($table, $param);
 
-		$table_string = DBA::buildTableString($table);
+		$table_string = DBA::buildTableString([$table]);
 
 		$fields_string = implode(', ', array_map([DBA::class, 'quoteIdentifier'], array_keys($param)));
 
@@ -1022,13 +1058,12 @@ class Database
 	 * 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
-	 *
+	 * @param string $table Table name in format schema.table (while scheme is optiona)
+	 * @param array  $param parameter array
 	 * @return boolean was the insert successful?
 	 * @throws \Exception
 	 */
-	public function replace($table, array $param)
+	public function replace(string $table, array $param): bool
 	{
 		if (empty($table) || empty($param)) {
 			$this->logger->info('Table and fields have to be set');
@@ -1037,7 +1072,7 @@ class Database
 
 		$param = $this->castFields($table, $param);
 
-		$table_string = DBA::buildTableString($table);
+		$table_string = DBA::buildTableString([$table]);
 
 		$fields_string = implode(', ', array_map([DBA::class, 'quoteIdentifier'], array_keys($param)));
 
@@ -1053,7 +1088,7 @@ class Database
 	 *
 	 * @return integer Last inserted id
 	 */
-	public function lastInsertId()
+	public function lastInsertId(): int
 	{
 		switch ($this->driver) {
 			case self::PDO:
@@ -1071,12 +1106,11 @@ class Database
 	 *
 	 * 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]
-	 *
+	 * @param string $table Table name in format schema.table (while scheme is optiona)
 	 * @return boolean was the lock successful?
 	 * @throws \Exception
 	 */
-	public function lock($table)
+	public function lock(string $table): bool
 	{
 		// See here: https://dev.mysql.com/doc/refman/5.7/en/lock-tables-and-transactions.html
 		if ($this->driver == self::PDO) {
@@ -1086,7 +1120,7 @@ class Database
 			$this->connection->autocommit(false);
 		}
 
-		$success = $this->e("LOCK TABLES " . DBA::buildTableString($table) . " WRITE");
+		$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);
@@ -1110,7 +1144,7 @@ class Database
 	 * @return boolean was the unlock successful?
 	 * @throws \Exception
 	 */
-	public function unlock()
+	public function unlock(): bool
 	{
 		// See here: https://dev.mysql.com/doc/refman/5.7/en/lock-tables-and-transactions.html
 		$this->performCommit();
@@ -1137,7 +1171,7 @@ class Database
 	 *
 	 * @return boolean Was the command executed successfully?
 	 */
-	public function transaction()
+	public function transaction(): bool
 	{
 		if (!$this->performCommit()) {
 			return false;
@@ -1161,7 +1195,12 @@ class Database
 		return true;
 	}
 
-	protected function performCommit()
+	/**
+	 * Performs the commit
+	 *
+	 * @return boolean Was the command executed successfully?
+	 */
+	protected function performCommit(): bool
 	{
 		switch ($this->driver) {
 			case self::PDO:
@@ -1183,7 +1222,7 @@ class Database
 	 *
 	 * @return boolean Was the command executed successfully?
 	 */
-	public function commit()
+	public function commit(): bool
 	{
 		if (!$this->performCommit()) {
 			return false;
@@ -1197,7 +1236,7 @@ class Database
 	 *
 	 * @return boolean Was the command executed successfully?
 	 */
-	public function rollback()
+	public function rollback(): bool
 	{
 		$ret = false;
 
@@ -1214,6 +1253,7 @@ class Database
 				$ret = $this->connection->rollback();
 				break;
 		}
+
 		$this->in_transaction = false;
 		return $ret;
 	}
@@ -1227,14 +1267,14 @@ class Database
 	 * @return boolean was the delete successful?
 	 * @throws \Exception
 	 */
-	public function delete($table, array $conditions)
+	public function delete(string $table, array $conditions): bool
 	{
 		if (empty($table) || empty($conditions)) {
 			$this->logger->info('Table and conditions have to be set');
 			return false;
 		}
 
-		$table_string = DBA::buildTableString($table);
+		$table_string = DBA::buildTableString([$table]);
 
 		$condition_string = DBA::buildCondition($conditions);
 
@@ -1244,9 +1284,9 @@ class Database
 	}
 
 	/**
-	 * Updates rows
+	 * Updates rows in the database. Field value objects will be cast as string.
 	 *
-	 * Updates rows in the database. When $old_fields is set to an array,
+	 * When $old_fields is set to an array,
 	 * the system will only do an update if the fields in that array changed.
 	 *
 	 * Attention:
@@ -1264,15 +1304,17 @@ class Database
 	 * 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 string        $table      Table name in format schema.table (while scheme is optiona)
 	 * @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)
+	 * @param array|boolean $old_fields array with the old field values that are about to be replaced (true = update on duplicate, false = don't update identical fields)
+	 * @param array         $params     Parameters: "ignore" If set to "true" then the update is done with the ignore parameter
 	 *
 	 * @return boolean was the update successfull?
 	 * @throws \Exception
+	 * @todo Implement "bool $update_on_duplicate" to avoid mixed type for $old_fields
 	 */
-	public function update($table, $fields, $condition, $old_fields = [])
+	public function update(string $table, array $fields, array $condition, $old_fields = [], array $params = [])
 	{
 		if (empty($table) || empty($fields) || empty($condition)) {
 			$this->logger->info('Table, fields and condition have to be set');
@@ -1293,7 +1335,7 @@ class Database
 			}
 		}
 
-		foreach ($old_fields AS $fieldname => $content) {
+		foreach ($old_fields as $fieldname => $content) {
 			if (isset($fields[$fieldname]) && !is_null($content) && ($fields[$fieldname] == $content)) {
 				unset($fields[$fieldname]);
 			}
@@ -1305,11 +1347,17 @@ class Database
 
 		$fields = $this->castFields($table, $fields);
 
-		$table_string = DBA::buildTableString($table);
+		$table_string = DBA::buildTableString([$table]);
 
 		$condition_string = DBA::buildCondition($condition);
 
-		$sql = "UPDATE " . $table_string . " SET "
+		if (!empty($params['ignore'])) {
+			$ignore = 'IGNORE ';
+		} else {
+			$ignore = '';
+		}
+
+		$sql = "UPDATE " . $ignore . $table_string . " SET "
 			. implode(" = ?, ", array_map([DBA::class, 'quoteIdentifier'], array_keys($fields))) . " = ?"
 			. $condition_string;
 
@@ -1322,16 +1370,16 @@ class Database
 	/**
 	 * 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
+	 * @param string $table     Table name in format schema.table (while scheme is optiona)
+	 * @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 bool|array
 	 * @throws \Exception
 	 * @see   $this->select
 	 */
-	public function selectFirst($table, array $fields = [], array $condition = [], $params = [])
+	public function selectFirst(string $table, array $fields = [], array $condition = [], array $params = [])
 	{
 		$params['limit'] = 1;
 		$result          = $this->select($table, $fields, $condition, $params);
@@ -1348,20 +1396,58 @@ class Database
 	/**
 	 * 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
-	 *
+	 * @param string $table     Table name in format schema.table (while scheme is optiona)
+	 * @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 = [])
+	public function selectToArray(string $table, array $fields = [], array $condition = [], array $params = [])
 	{
 		return $this->toArray($this->select($table, $fields, $condition, $params));
 	}
 
+	/**
+	 * Escape fields, adding special treatment for "group by" handling
+	 *
+	 * @param array $fields 
+	 * @param array $options 
+	 * @return array Escaped fields
+	 */
+	private function escapeFields(array $fields, array $options): array
+	{
+		// In the case of a "GROUP BY" we have to add all the ORDER fields to the fieldlist.
+		// This needs to done to apply the "ANY_VALUE(...)" treatment from below to them.
+		// Otherwise MySQL would report errors.
+		if (!empty($options['group_by']) && !empty($options['order'])) {
+			foreach ($options['order'] as $key => $field) {
+				if (!is_int($key)) {
+					if (!in_array($key, $fields)) {
+						$fields[] = $key;
+					}
+				} else {
+					if (!in_array($field, $fields)) {
+						$fields[] = $field;
+					}
+				}
+			}
+		}
+
+		array_walk($fields, function(&$value, $key) use ($options)
+		{
+			$field = $value;
+			$value = DBA::quoteIdentifier($field);
+
+			if (!empty($options['group_by']) && !in_array($field, $options['group_by'])) {
+				$value = 'ANY_VALUE(' . $value . ') AS ' . $value;
+			}
+		});
+
+		return $fields;
+	}
+
 	/**
 	 * Select rows from a table
 	 *
@@ -1384,26 +1470,27 @@ class Database
 	 *
 	 * $data = DBA::select($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
+	 * @param string $table     Table name in format schema.table (while scheme is optiona)
+	 * @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 = [])
+	public function select(string $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));
+			$fields = $this->escapeFields($fields, $params);
+			$select_string = implode(', ', $fields);
 		} else {
 			$select_string = '*';
 		}
 
-		$table_string = DBA::buildTableString($table);
+		$table_string = DBA::buildTableString([$table]);
 
 		$condition_string = DBA::buildCondition($condition);
 
@@ -1423,11 +1510,11 @@ class Database
 	/**
 	 * 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
+	 * @param string $table     Table name in format schema.table (while scheme is optiona)
+	 * @param array  $condition Array of fields for condition
+	 * @param array  $params    Array of several parameters
 	 *
-	 * @return int
+	 * @return int Count of rows
 	 *
 	 * Example:
 	 * $table = "post";
@@ -1439,13 +1526,13 @@ class Database
 	 * $count = DBA::count($table, $condition);
 	 * @throws \Exception
 	 */
-	public function count($table, array $condition = [], array $params = [])
+	public function count(string $table, array $condition = [], array $params = []): int
 	{
 		if (empty($table)) {
-			return false;
+			throw new InvalidArgumentException('Parameter "table" cannot be empty.');
 		}
 
-		$table_string = DBA::buildTableString($table);
+		$table_string = DBA::buildTableString([$table]);
 
 		$condition_string = DBA::buildCondition($condition);
 
@@ -1461,8 +1548,12 @@ class Database
 
 		$row = $this->fetchFirst($sql, $condition);
 
-		// Ensure to always return either a "null" or a numeric value
-		return is_numeric($row['count']) ? (int)$row['count'] : $row['count'];
+		if (!isset($row['count'])) {
+			$this->logger->notice('Invalid count.', ['table' => $table, 'row' => $row, 'expression' => $expression, 'condition' => $condition_string, 'callstack' => System::callstack()]);
+			return 0;
+		} else {
+			return (int)$row['count'];
+		}
 	}
 
 	/**
@@ -1474,7 +1565,7 @@ class Database
 	 *
 	 * @return array Data array
 	 */
-	public function toArray($stmt, $do_close = true, int $count = 0)
+	public function toArray($stmt, bool $do_close = true, int $count = 0): array
 	{
 		if (is_bool($stmt)) {
 			return [];
@@ -1502,7 +1593,8 @@ class Database
 	 * @param array  $fields
 	 * @return array casted fields
 	 */
-	public function castFields(string $table, array $fields) {
+	public function castFields(string $table, array $fields): array
+	{
 		// When there is no data, we don't need to do something
 		if (empty($fields)) {
 			return $fields;
@@ -1520,15 +1612,15 @@ class Database
 
 		$types = [];
 
-		$tables = DBStructure::definition('', false);
+		$tables = $this->dbaDefinition->getAll();
 		if (empty($tables[$table])) {
 			// When a matching table wasn't found we check if it is a view
-			$views = View::definition('', false);
+			$views = $this->viewDefinition->getAll();
 			if (empty($views[$table])) {
 				return $fields;
 			}
 
-			foreach(array_keys($fields) as $field) {
+			foreach (array_keys($fields) as $field) {
 				if (!empty($views[$table]['fields'][$field])) {
 					$viewdef = $views[$table]['fields'][$field];
 					if (!empty($tables[$viewdef[0]]['fields'][$viewdef[1]]['type'])) {
@@ -1557,15 +1649,15 @@ class Database
 			}
 		}
 
-		return $fields;	
+		return $fields;
 	}
-	
+
 	/**
 	 * Returns the error number of the last query
 	 *
 	 * @return string Error number (0 if no error)
 	 */
-	public function errorNo()
+	public function errorNo(): int
 	{
 		return $this->errorno;
 	}
@@ -1575,7 +1667,7 @@ class Database
 	 *
 	 * @return string Error message ('' if no error)
 	 */
-	public function errorMessage()
+	public function errorMessage(): string
 	{
 		return $this->error;
 	}
@@ -1587,7 +1679,7 @@ class Database
 	 *
 	 * @return boolean was the close successful?
 	 */
-	public function close($stmt)
+	public function close($stmt): bool
 	{
 
 		$this->profiler->startRecording('database');
@@ -1629,38 +1721,39 @@ class Database
 	 *      'amount' => Number of concurrent database processes
 	 * @throws \Exception
 	 */
-	public function processlist()
+	public function processlist(): array
 	{
-		$ret  = $this->p("SHOW PROCESSLIST");
+		$ret  = $this->p('SHOW PROCESSLIST');
 		$data = $this->toArray($ret);
 
 		$processes = 0;
 		$states    = [];
 		foreach ($data as $process) {
-			$state = trim($process["State"]);
+			$state = trim($process['State']);
 
 			// Filter out all non blocking processes
-			if (!in_array($state, ["", "init", "statistics", "updating"])) {
+			if (!in_array($state, ['', 'init', 'statistics', 'updating'])) {
 				++$states[$state];
 				++$processes;
 			}
 		}
 
-		$statelist = "";
+		$statelist = '';
 		foreach ($states as $state => $usage) {
-			if ($statelist != "") {
-				$statelist .= ", ";
+			if ($statelist != '') {
+				$statelist .= ', ';
 			}
-			$statelist .= $state . ": " . $usage;
+			$statelist .= $state . ': ' . $usage;
 		}
-		return (["list" => $statelist, "amount" => $processes]);
+		return (['list' => $statelist, 'amount' => $processes]);
 	}
 
 	/**
 	 * Fetch a database variable
 	 *
 	 * @param string $name
-	 * @return string content
+	 * @return string|null content or null if inexistent
+	 * @throws \Exception
 	 */
 	public function getVariable(string $name)
 	{
@@ -1672,10 +1765,9 @@ class Database
 	 * 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)
+	public function isResult($array): bool
 	{
 		// It could be a return value from an update statement
 		if (is_bool($array)) {
@@ -1695,10 +1787,9 @@ class Database
 	 * @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, $add_quotation)
+	private function escapeArrayCallback(&$value, string $key, bool $add_quotation)
 	{
 		if (!$add_quotation) {
 			if (is_bool($value)) {
@@ -1723,11 +1814,40 @@ class Database
 	 *
 	 * @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, $add_quotation = false)
+	public function escapeArray(&$arr, bool $add_quotation = false)
 	{
 		array_walk($arr, [$this, 'escapeArrayCallback'], $add_quotation);
 	}
+
+	/**
+	 * Replaces a string in the provided fields of the provided table
+	 *
+	 * @param string $table  Table name
+	 * @param array  $fields List of field names in the provided table
+	 * @param string $search String to search for
+	 * @param string $replace String to replace with
+	 * @return void
+	 * @throws \Exception
+	 */
+	public function replaceInTableFields(string $table, array $fields, string $search, string $replace)
+	{
+		$search = $this->escape($search);
+		$replace = $this->escape($replace);
+
+		$upd = [];
+		foreach ($fields as $field) {
+			$field = DBA::quoteIdentifier($field);
+			$upd[] = "$field = REPLACE($field, '$search', '$replace')";
+		}
+
+		$upds = implode(', ', $upd);
+
+		$r = $this->e(sprintf("UPDATE %s SET %s;", DBA::quoteIdentifier($table), $upds));
+
+		if (!$this->isResult($r)) {
+			throw new \RuntimeException("Failed updating `$table`: " . $this->errorMessage());
+		}
+	}
 }