X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=include%2Fdba.php;h=b9e6c32d56acff766aeec3ffc91af5b09f5a023c;hb=d649873f804f9ed77e69ef6cd12af4a263233945;hp=62728acaed0294ba467cb126cd5ed022f1329e95;hpb=28b3fa4f1fad67816ae6904f94a20d0ee58b2ced;p=friendica.git

diff --git a/include/dba.php b/include/dba.php
index 62728acaed..b9e6c32d56 100644
--- a/include/dba.php
+++ b/include/dba.php
@@ -10,6 +10,7 @@ require_once('include/datetime.php');
  * When logging, all binary info is converted to text and html entities are escaped so that
  * the debugging stream is safe to view within both terminals and web pages.
  *
+ * This class is for the low level database stuff that does driver specific things.
  */
 
 class dba {
@@ -20,12 +21,25 @@ class dba {
 	private $driver;
 	public  $connected = false;
 	public  $error = false;
+	private $_server_info = '';
+	private static $in_transaction = false;
+	private static $dbo;
+	private static $relation = array();
 
-	function __construct($server, $user, $pass, $db, $install = false) {
+	function __construct($serveraddr, $user, $pass, $db, $install = false) {
 		$a = get_app();
 
 		$stamp1 = microtime(true);
 
+		$serveraddr = trim($serveraddr);
+
+		$serverdata = explode(':', $serveraddr);
+		$server = $serverdata[0];
+
+		if (count($serverdata) > 1) {
+			$port = trim($serverdata[1]);
+		}
+
 		$server = trim($server);
 		$user = trim($user);
 		$pass = trim($pass);
@@ -51,6 +65,11 @@ class dba {
 		if (class_exists('\PDO') && in_array('mysql', PDO::getAvailableDrivers())) {
 			$this->driver = 'pdo';
 			$connect = "mysql:host=".$server.";dbname=".$db;
+
+			if (isset($port)) {
+				$connect .= ";port=".$port;
+			}
+
 			if (isset($a->config["system"]["db_charset"])) {
 				$connect .= ";charset=".$a->config["system"]["db_charset"];
 			}
@@ -60,7 +79,7 @@ class dba {
 			}
 		} elseif (class_exists('mysqli')) {
 			$this->driver = 'mysqli';
-			$this->db = @new mysqli($server,$user,$pass,$db);
+			$this->db = @new mysqli($server, $user, $pass, $db, $port);
 			if (!mysqli_connect_errno()) {
 				$this->connected = true;
 
@@ -70,8 +89,8 @@ class dba {
 			}
 		} elseif (function_exists('mysql_connect')) {
 			$this->driver = 'mysql';
-			$this->db = mysql_connect($server,$user,$pass);
-			if ($this->db && mysql_select_db($db,$this->db)) {
+			$this->db = mysql_connect($serveraddr, $user, $pass);
+			if ($this->db && mysql_select_db($db, $this->db)) {
 				$this->connected = true;
 
 				if (isset($a->config["system"]["db_charset"])) {
@@ -92,6 +111,8 @@ class dba {
 			}
 		}
 		$a->save_timestamp($stamp1, "network");
+
+		self::$dbo = $this;
 	}
 
 	/**
@@ -103,18 +124,20 @@ class dba {
 	 * @return string
 	 */
 	public function server_info() {
-		switch ($this->driver) {
-			case 'pdo':
-				$version = $this->db->getAttribute(PDO::ATTR_SERVER_VERSION);
-				break;
-			case 'mysqli':
-				$version = $this->db->server_info;
-				break;
-			case 'mysql':
-				$version = mysql_get_server_info($this->db);
-				break;
+		if ($this->_server_info == '') {
+			switch ($this->driver) {
+				case 'pdo':
+					$this->_server_info = $this->db->getAttribute(PDO::ATTR_SERVER_VERSION);
+					break;
+				case 'mysqli':
+					$this->_server_info = $this->db->server_info;
+					break;
+				case 'mysql':
+					$this->_server_info = mysql_get_server_info($this->db);
+					break;
+			}
 		}
-		return $version;
+		return $this->_server_info;
 	}
 
 	/**
@@ -128,30 +151,6 @@ class dba {
 		return $r[0]['db'];
 	}
 
-	/**
-	 * @brief Returns the number of rows
-	 *
-	 * @return integer
-	 */
-	public function num_rows() {
-		if (!$this->result) {
-			return 0;
-		}
-
-		switch ($this->driver) {
-			case 'pdo':
-				$rows = $this->result->rowCount();
-				break;
-			case 'mysqli':
-				$rows = $this->result->num_rows;
-				break;
-			case 'mysql':
-				$rows = mysql_num_rows($this->result);
-				break;
-		}
-		return $rows;
-	}
-
 	/**
 	 * @brief Analyze a database query and log this if some conditions are met.
 	 *
@@ -246,7 +245,7 @@ class dba {
 				break;
 		}
 		$stamp2 = microtime(true);
-		$duration = (float)($stamp2-$stamp1);
+		$duration = (float)($stamp2 - $stamp1);
 
 		$a->save_timestamp($stamp1, "database");
 
@@ -376,41 +375,6 @@ class dba {
 		return($r);
 	}
 
-	public function qfetch() {
-		$x = false;
-
-		if ($this->result) {
-			switch ($this->driver) {
-				case 'pdo':
-					$x = $this->result->fetch(PDO::FETCH_ASSOC);
-					break;
-				case 'mysqli':
-					$x = $this->result->fetch_array(MYSQLI_ASSOC);
-					break;
-				case 'mysql':
-					$x = mysql_fetch_array($this->result, MYSQL_ASSOC);
-					break;
-			}
-		}
-		return($x);
-	}
-
-	public function qclose() {
-		if ($this->result) {
-			switch ($this->driver) {
-				case 'pdo':
-					$this->result->closeCursor();
-					break;
-				case 'mysqli':
-					$this->result->free_result();
-					break;
-				case 'mysql':
-					mysql_free_result($this->result);
-					break;
-			}
-		}
-	}
-
 	public function dbg($dbg) {
 		$this->debug = $dbg;
 	}
@@ -474,6 +438,753 @@ class dba {
 			}
 		}
 	}
+
+	/**
+	 * @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 $sql An SQL string without the values
+	 * @return string The input SQL string modified if necessary.
+	 */
+	public function any_value_fallback($sql) {
+		$server_info = $this->server_info();
+		if (version_compare($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 $sql An SQL string without the values
+	 * @return string The input SQL string modified if necessary.
+	 */
+	public function clean_query($sql) {
+		$search = array("\t", "\n", "\r", "  ");
+		$replace = array(' ', ' ', ' ', ' ');
+		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 $args The parameters that are to replace the ? placeholders
+	 * @return string The replaced SQL query
+	 */
+	static private function replace_parameters($sql, $args) {
+		$offset = 0;
+		foreach ($args AS $param => $value) {
+			if (is_int($args[$param]) OR is_float($args[$param])) {
+				$replace = intval($args[$param]);
+			} else {
+				$replace = "'".self::$dbo->escape($args[$param])."'";
+			}
+
+			$pos = strpos($sql, '?', $offset);
+			if ($pos !== false) {
+				$sql = substr_replace($sql, $replace, $pos, 1);
+			}
+			$offset = $pos + strlen($replace);
+		}
+		return $sql;
+	}
+
+	/**
+	 * @brief Executes a prepared statement that returns data
+	 * @usage Example: $r = p("SELECT * FROM `item` WHERE `guid` = ?", $guid);
+	 * @param string $sql SQL statement
+	 * @return object statement object
+	 */
+	static public function p($sql) {
+		$a = get_app();
+
+		$stamp1 = microtime(true);
+
+		$args = func_get_args();
+		unset($args[0]);
+
+		// When the second function parameter is an array then use this as the parameter array
+		if ((count($args) > 0) AND (is_array($args[1]))) {
+			$params = $args[1];
+		} else {
+			$params = $args;
+		}
+
+		// Renumber the array keys to be sure that they fit
+		$i = 0;
+		$args = array();
+		foreach ($params AS $param) {
+			$args[++$i] = $param;
+		}
+
+		if (!self::$dbo OR !self::$dbo->connected) {
+			return false;
+		}
+
+		if (substr_count($sql, '?') != count($args)) {
+			// Question: Should we continue or stop the query here?
+			logger('Parameter mismatch. Query "'.$sql.'" - Parameters '.print_r($args, true), LOGGER_DEBUG);
+		}
+
+		$sql = self::$dbo->clean_query($sql);
+		$sql = self::$dbo->any_value_fallback($sql);
+
+		if (x($a->config,'system') && x($a->config['system'], 'db_callstack')) {
+			$sql = "/*".$a->callstack()." */ ".$sql;
+		}
+
+		self::$dbo->error = '';
+		self::$dbo->errorno = 0;
+
+		switch (self::$dbo->driver) {
+			case 'pdo':
+				if (!$stmt = self::$dbo->db->prepare($sql)) {
+					$errorInfo = self::$dbo->db->errorInfo();
+					self::$dbo->error = $errorInfo[2];
+					self::$dbo->errorno = $errorInfo[1];
+					$retval = false;
+					break;
+				}
+
+				foreach ($args AS $param => $value) {
+					$stmt->bindParam($param, $args[$param]);
+				}
+
+				if (!$stmt->execute()) {
+					$errorInfo = $stmt->errorInfo();
+					self::$dbo->error = $errorInfo[2];
+					self::$dbo->errorno = $errorInfo[1];
+					$retval = false;
+				} else {
+					$retval = $stmt;
+				}
+				break;
+			case 'mysqli':
+				$stmt = self::$dbo->db->stmt_init();
+
+				if (!$stmt->prepare($sql)) {
+					self::$dbo->error = $stmt->error;
+					self::$dbo->errorno = $stmt->errno;
+					$retval = false;
+					break;
+				}
+
+				$params = '';
+				$values = array();
+				foreach ($args AS $param => $value) {
+					if (is_int($args[$param])) {
+						$params .= 'i';
+					} elseif (is_float($args[$param])) {
+						$params .= 'd';
+					} elseif (is_string($args[$param])) {
+						$params .= 's';
+					} else {
+						$params .= 'b';
+					}
+					$values[] = &$args[$param];
+				}
+
+				if (count($values) > 0) {
+					array_unshift($values, $params);
+					call_user_func_array(array($stmt, 'bind_param'), $values);
+				}
+
+				if (!$stmt->execute()) {
+					self::$dbo->error = self::$dbo->db->error;
+					self::$dbo->errorno = self::$dbo->db->errno;
+					$retval = false;
+				} else {
+					$stmt->store_result();
+					$retval = $stmt;
+				}
+				break;
+			case 'mysql':
+				// For the old "mysql" functions we cannot use prepared statements
+				$retval = mysql_query(self::replace_parameters($sql, $args), self::$dbo->db);
+				if (mysql_errno(self::$dbo->db)) {
+					self::$dbo->error = mysql_error(self::$dbo->db);
+					self::$dbo->errorno = mysql_errno(self::$dbo->db);
+				}
+				break;
+		}
+
+		if (self::$dbo->errorno != 0) {
+			logger('DB Error '.self::$dbo->errorno.': '.self::$dbo->error."\n".
+				$a->callstack(8))."\n".self::replace_parameters($sql, $args);
+		}
+
+		$a->save_timestamp($stamp1, 'database');
+
+		if (x($a->config,'system') && x($a->config['system'], 'db_log')) {
+
+			$stamp2 = microtime(true);
+			$duration = (float)($stamp2 - $stamp1);
+
+			if (($duration > $a->config["system"]["db_loglimit"])) {
+				$duration = round($duration, 3);
+				$backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
+
+				@file_put_contents($a->config["system"]["db_log"], datetime_convert()."\t".$duration."\t".
+						basename($backtrace[1]["file"])."\t".
+						$backtrace[1]["line"]."\t".$backtrace[2]["function"]."\t".
+						substr(self::replace_parameters($sql, $args), 0, 2000)."\n", FILE_APPEND);
+			}
+		}
+		return $retval;
+	}
+
+	/**
+	 * @brief Executes a prepared statement like UPDATE or INSERT that doesn't return data
+	 *
+	 * @param string $sql SQL statement
+	 * @return boolean Was the query successfull? False is returned only if an error occurred
+	 */
+	static public function e($sql) {
+		$a = get_app();
+
+		$stamp = microtime(true);
+
+		$args = func_get_args();
+
+		$stmt = call_user_func_array('self::p', $args);
+
+		if (is_bool($stmt)) {
+			$retval = $stmt;
+		} elseif (is_object($stmt)) {
+			$retval = true;
+		} else {
+			$retval = false;
+		}
+
+		self::close($stmt);
+
+		$a->save_timestamp($stamp, "database_write");
+
+		return $retval;
+	}
+
+	/**
+	 * @brief Check if data exists
+	 *
+	 * @param string $sql SQL statement
+	 * @return boolean Are there rows for that query?
+	 */
+	static public function exists($sql) {
+		$args = func_get_args();
+
+		$stmt = call_user_func_array('self::p', $args);
+
+		if (is_bool($stmt)) {
+			$retval = $stmt;
+		} else {
+			$retval = (self::num_rows($stmt) > 0);
+		}
+
+		self::close($stmt);
+
+		return $retval;
+	}
+
+	/**
+	 * @brief Fetches the first row
+	 *
+	 * @param string $sql SQL statement
+	 * @return array first row of query
+	 */
+	static public function fetch_first($sql) {
+		$args = func_get_args();
+
+		$stmt = call_user_func_array('self::p', $args);
+
+		if (is_bool($stmt)) {
+			$retval = $stmt;
+		} else {
+			$retval = self::fetch($stmt);
+		}
+
+		self::close($stmt);
+
+		return $retval;
+	}
+
+	/**
+	 * @brief Returns the number of rows of a statement
+	 *
+	 * @param object Statement object
+	 * @return int Number of rows
+	 */
+	static public function num_rows($stmt) {
+		if (!is_object($stmt)) {
+			return 0;
+		}
+		switch (self::$dbo->driver) {
+			case 'pdo':
+				return $stmt->rowCount();
+			case 'mysqli':
+				return $stmt->num_rows;
+			case 'mysql':
+				return mysql_num_rows($stmt);
+		}
+		return 0;
+	}
+
+	/**
+	 * @brief Fetch a single row
+	 *
+	 * @param object $stmt statement object
+	 * @return array current row
+	 */
+	static public function fetch($stmt) {
+		if (!is_object($stmt)) {
+			return false;
+		}
+
+		switch (self::$dbo->driver) {
+			case 'pdo':
+				return $stmt->fetch(PDO::FETCH_ASSOC);
+			case 'mysqli':
+				// This code works, but is slow
+
+				// Bind the result to a result array
+				$cols = array();
+
+				$cols_num = array();
+				for ($x = 0; $x < $stmt->field_count; $x++) {
+					$cols[] = &$cols_num[$x];
+				}
+
+				call_user_func_array(array($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();
+
+				$columns = array();
+				foreach ($cols_num AS $param => $col) {
+					$columns[$fields[$param]->name] = $col;
+				}
+				return $columns;
+			case 'mysql':
+				return mysql_fetch_array(self::$dbo->result, MYSQL_ASSOC);
+		}
+	}
+
+	/**
+	 * @brief Insert a row into a table
+	 *
+	 * @param string $table Table name
+	 * @param array $param parameter array
+	 *
+	 * @return boolean was the insert successfull?
+	 */
+	static public function insert($table, $param) {
+		$sql = "INSERT INTO `".self::$dbo->escape($table)."` (`".implode("`, `", array_keys($param))."`) VALUES (".
+			substr(str_repeat("?, ", count($param)), 0, -2).");";
+
+		return self::e($sql, $param);
+	}
+
+	/**
+	 * @brief Starts a transaction
+	 *
+	 * @return boolean Was the command executed successfully?
+	 */
+	static public function transaction() {
+		if (!self::e('COMMIT')) {
+			return false;
+		}
+		if (!self::e('START TRANSACTION')) {
+			return false;
+		}
+		self::$in_transaction = true;
+		return true;
+	}
+
+	/**
+	 * @brief Does a commit
+	 *
+	 * @return boolean Was the command executed successfully?
+	 */
+	static public function commit() {
+		if (!self::e('COMMIT')) {
+			return false;
+		}
+		self::$in_transaction = false;
+		return true;
+	}
+
+	/**
+	 * @brief Does a rollback
+	 *
+	 * @return boolean Was the command executed successfully?
+	 */
+	static public function rollback() {
+		if (!self::e('ROLLBACK')) {
+			return false;
+		}
+		self::$in_transaction = false;
+		return true;
+	}
+
+	/**
+	 * @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.
+	 */
+	static private function build_relation_data() {
+		$definition = db_definition();
+
+		foreach ($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 $param parameter array
+	 * @param boolean $in_process Internal use: Only do a commit after the last delete
+	 * @param array $callstack Internal use: prevent endless loops
+	 *
+	 * @return boolean|array was the delete successfull? When $in_process is set: deletion data
+	 */
+	static public function delete($table, $param, $in_process = false, &$callstack = array()) {
+
+		$commands = array();
+
+		// Create a key for the loop prevention
+		$key = $table.':'.implode(':', array_keys($param)).':'.implode(':', $param);
+
+		// We quit when this key already exists in the callstack.
+		if (isset($callstack[$key])) {
+			return $commands;
+		}
+
+		$callstack[$key] = true;
+
+		$table = self::$dbo->escape($table);
+
+		$commands[$key] = array('table' => $table, 'param' => $param);
+
+		// To speed up the whole process we cache the table relations
+		if (count(self::$relation) == 0) {
+			self::build_relation_data();
+		}
+
+		// Is there a relation entry for the table?
+		if (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.':'.implode(':', array_keys($param)).':'.implode(':', $param);
+
+			// When the search field is the relation field, we don't need to fetch the rows
+			// This is useful when the leading record is already deleted in the frontend but the rest is done in the backend
+			if ((count($param) == 1) AND ($field == array_keys($param)[0])) {
+				foreach ($rel_def AS $rel_table => $rel_fields) {
+					foreach ($rel_fields AS $rel_field) {
+						$retval = self::delete($rel_table, array($rel_field => array_values($param)[0]), true, $callstack);
+						$commands = array_merge($commands, $retval);
+					}
+				}
+			// We quit when this key already exists in the callstack.
+			} elseif (!isset($callstack[$qkey])) {
+
+				$callstack[$qkey] = true;
+
+				// Fetch all rows that are to be deleted
+				$sql = "SELECT ".self::$dbo->escape($field)." FROM `".$table."` WHERE `".
+				implode("` = ? AND `", array_keys($param))."` = ?";
+
+				$data = self::p($sql, $param);
+				while ($row = self::fetch($data)) {
+					// Now we accumulate the delete commands
+					$retval = self::delete($table, array($field => $row[$field]), true, $callstack);
+					$commands = array_merge($commands, $retval);
+				}
+
+				// Since we had split the delete command we don't need the original command anymore
+				unset($commands[$key]);
+			}
+		}
+
+		if (!$in_process) {
+			// Now we finalize the process
+			$do_transaction = !self::$in_transaction;
+
+			if ($do_transaction) {
+				self::transaction();
+			}
+
+			$compacted = array();
+			$counter = array();
+			foreach ($commands AS $command) {
+				if (count($command['param']) > 1) {
+					$sql = "DELETE FROM `".$command['table']."` WHERE `".
+						implode("` = ? AND `", array_keys($command['param']))."` = ?";
+
+					logger(dba::replace_parameters($sql, $command['param']), LOGGER_DATA);
+
+					if (!self::e($sql, $command['param'])) {
+						if ($do_transaction) {
+							self::rollback();
+						}
+						return false;
+					}
+				} else {
+					$key_table = $command['table'];
+					$key_param = array_keys($command['param'])[0];
+					$value = array_values($command['param'])[0];
+
+					// Split the SQL queries in chunks of 100 values
+					// We do the $i stuff here to make the code better readable
+					$i = $counter[$key_table][$key_param];
+					if (count($compacted[$key_table][$key_param][$i]) > 100) {
+						++$i;
+					}
+
+					$compacted[$key_table][$key_param][$i][$value] = $value;
+					$counter[$key_table][$key_param] = $i;
+				}
+			}
+			foreach ($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(dba::replace_parameters($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;
+		}
+
+		return $commands;
+	}
+
+	/**
+	 * @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 $old_fields array with the old field values that are about to be replaced
+	 *
+	 * @return boolean was the update successfull?
+	 */
+	static public function update($table, $fields, $condition, $old_fields = array()) {
+
+		/** @todo We may use MySQL specific functions here:
+		 * INSERT INTO `config` (`cat`, `k`, `v`) VALUES ('%s', '%s', '%s') ON DUPLICATE KEY UPDATE `v` = '%s'"
+		 * But I think that it doesn't make sense here.
+		*/
+
+		$table = self::$dbo->escape($table);
+
+		if (is_bool($old_fields)) {
+			$sql = "SELECT * FROM `".$table."` WHERE `".
+			implode("` = ? AND `", array_keys($condition))."` = ? LIMIT 1";
+
+			$params = array();
+			foreach ($condition AS $value) {
+				$params[] = $value;
+			}
+
+			$do_insert = $old_fields;
+
+			$old_fields = self::fetch_first($sql, $params);
+			if (is_bool($old_fields)) {
+				if ($do_insert) {
+					return self::insert($table, $fields);
+				}
+				$old_fields = array();
+			}
+		}
+
+		$do_update = (count($old_fields) == 0);
+
+		foreach ($old_fields AS $fieldname => $content) {
+			if (isset($fields[$fieldname])) {
+				if ($fields[$fieldname] == $content) {
+					unset($fields[$fieldname]);
+				} else {
+					$do_update = true;
+				}
+			}
+		}
+
+		if (!$do_update OR (count($fields) == 0)) {
+			return true;
+		}
+
+		$sql = "UPDATE `".$table."` SET `".
+			implode("` = ?, `", array_keys($fields))."` = ? WHERE `".
+			implode("` = ? AND `", array_keys($condition))."` = ?";
+
+		$params = array();
+		foreach ($fields AS $value) {
+			$params[] = $value;
+		}
+		foreach ($condition AS $value) {
+			$params[] = $value;
+		}
+
+		return self::e($sql, $params);
+	}
+
+	/**
+	 * @brief Select rows from a table
+	 *
+	 * @param string $table Table name
+	 * @param array $fields array of selected fields
+	 * @param array $condition array of fields for condition
+	 * @param array $params array of several parameters
+	 *
+	 * @return boolean|object If "limit" is equal "1" only a single row is returned, else a query object is returned
+	 *
+	 * Example:
+	 * $table = "item";
+	 * $fields = array("id", "uri", "uid", "network");
+	 * $condition = array("uid" => 1, "network" => 'dspr');
+	 * $params = array("order" => array("id", "received" => true), "limit" => 1);
+	 *
+	 * $data = dba::select($table, $fields, $condition, $params);
+	 */
+	static public function select($table, $fields = array(), $condition = array(), $params = array()) {
+		if ($table == '') {
+			return false;
+		}
+
+		if (count($fields) > 0) {
+			$select_fields = "`".implode("`, `", array_values($fields))."`";
+		} else {
+			$select_fields = "*";
+		}
+
+		if (count($condition) > 0) {
+			$condition_string = " WHERE `".implode("` = ? AND `", array_keys($condition))."` = ?";
+		} else {
+			$condition_string = "";
+		}
+
+		$param_string = '';
+		$single_row = false;
+
+		if (isset($params['order'])) {
+			$param_string .= " ORDER BY ";
+			foreach ($params['order'] AS $fields => $order) {
+				if (!is_int($fields)) {
+					$param_string .= "`".$fields."` ".($order ? "DESC" : "ASC").", ";
+				} else {
+					$param_string .= "`".$order."`, ";
+				}
+			}
+			$param_string = substr($param_string, 0, -2);
+		}
+
+		if (isset($params['limit'])) {
+			if (is_int($params['limit'])) {
+				$param_string .= " LIMIT ".$params['limit'];
+				$single_row =($params['limit'] == 1);
+			}
+		}
+
+		$sql = "SELECT ".$select_fields." FROM `".$table."`".$condition_string.$param_string;
+
+		$result = self::p($sql, $condition);
+
+		if (is_bool($result) OR !$single_row) {
+			return $result;
+		} else {
+			$row = self::fetch($result);
+			self::close($result);
+			return $row;
+		}
+	}
+
+	/**
+	 * @brief Closes the current statement
+	 *
+	 * @param object $stmt statement object
+	 * @return boolean was the close successfull?
+	 */
+	static public function close($stmt) {
+		if (!is_object($stmt)) {
+			return false;
+		}
+
+		switch (self::$dbo->driver) {
+			case 'pdo':
+				return $stmt->closeCursor();
+			case 'mysqli':
+				return $stmt->free_result();
+				return $stmt->close();
+			case 'mysql':
+				return mysql_free_result($stmt);
+		}
+	}
 }
 
 function printable($s) {
@@ -514,6 +1225,8 @@ function q($sql) {
 	unset($args[0]);
 
 	if ($db && $db->connected) {
+		$sql = $db->clean_query($sql);
+		$sql = $db->any_value_fallback($sql);
 		$stmt = @vsprintf($sql,$args); // Disabled warnings
 		//logger("dba: q: $stmt", LOGGER_ALL);
 		if ($stmt === false)
@@ -550,6 +1263,8 @@ function qu($sql) {
 	unset($args[0]);
 
 	if ($db && $db->connected) {
+		$sql = $db->clean_query($sql);
+		$sql = $db->any_value_fallback($sql);
 		$stmt = @vsprintf($sql,$args); // Disabled warnings
 		if ($stmt === false)
 			logger('dba: vsprintf error: ' . print_r(debug_backtrace(),true), LOGGER_DEBUG);