diff --git a/dibi/dibi.php b/dibi/dibi.php
index aa1043d..052e68b 100644
--- a/dibi/dibi.php
+++ b/dibi/dibi.php
@@ -199,7 +199,7 @@ class dibi
 	 */
 	public static function isConnected()
 	{
-		return (bool) self::$connection;
+		return (self::$connection !== NULL) && self::$connection->isConnected();
 	}
 
 
@@ -214,7 +214,7 @@ class dibi
 	public static function getConnection($name = NULL)
 	{
 		if ($name === NULL) {
-			if (!self::$connection) {
+			if (self::$connection === NULL) {
 				throw new DibiException('Dibi is not connected to database.');
 			}
 
diff --git a/dibi/drivers/mssql.php b/dibi/drivers/mssql.php
index 7180f90..9de24c1 100644
--- a/dibi/drivers/mssql.php
+++ b/dibi/drivers/mssql.php
@@ -77,16 +77,16 @@ class DibiMsSqlDriver extends /*Nette::*/Object implements IDibiDriver
 		DibiConnection::alias($config, 'host');
 
 		if (empty($config['persistent'])) {
-			$this->connection = @mssql_connect($config['host'], $config['username'], $config['password'], TRUE);
+			$this->connection = @mssql_connect($config['host'], $config['username'], $config['password'], TRUE); // intentionally @
 		} else {
-			$this->connection = @mssql_pconnect($config['host'], $config['username'], $config['password']);
+			$this->connection = @mssql_pconnect($config['host'], $config['username'], $config['password']); // intentionally @
 		}
 
 		if (!is_resource($this->connection)) {
 			throw new DibiDriverException("Can't connect to DB.");
 		}
 
-		if (isset($config['database']) && !@mssql_select_db($config['database'], $this->connection)) {
+		if (isset($config['database']) && !@mssql_select_db($config['database'], $this->connection)) { // intentionally @
 			throw new DibiDriverException("Can't select DB '$config[database]'.");
 		}
 	}
@@ -114,7 +114,7 @@ class DibiMsSqlDriver extends /*Nette::*/Object implements IDibiDriver
 	 */
 	public function query($sql)
 	{
-		$this->resultset = @mssql_query($sql, $this->connection);
+		$this->resultset = @mssql_query($sql, $this->connection); // intentionally @
 
 		if ($this->resultset === FALSE) {
 			throw new DibiDriverException('Query error', 0, $sql);
diff --git a/dibi/drivers/mysql.php b/dibi/drivers/mysql.php
index dfdb677..9e82b10 100644
--- a/dibi/drivers/mysql.php
+++ b/dibi/drivers/mysql.php
@@ -110,9 +110,9 @@ class DibiMySqlDriver extends /*Nette::*/Object implements IDibiDriver
 		}
 
 		if (empty($config['persistent'])) {
-			$this->connection = @mysql_connect($host, $config['username'], $config['password'], TRUE, $config['options']);
+			$this->connection = @mysql_connect($host, $config['username'], $config['password'], TRUE, $config['options']); // intentionally @
 		} else {
-			$this->connection = @mysql_pconnect($host, $config['username'], $config['password'], $config['options']);
+			$this->connection = @mysql_pconnect($host, $config['username'], $config['password'], $config['options']); // intentionally @
 		}
 
 		if (!is_resource($this->connection)) {
@@ -123,18 +123,18 @@ class DibiMySqlDriver extends /*Nette::*/Object implements IDibiDriver
 			$ok = FALSE;
 			if (function_exists('mysql_set_charset')) {
 				// affects the character set used by mysql_real_escape_string() (was added in MySQL 5.0.7 and PHP 5.2.3)
-				$ok = @mysql_set_charset($config['charset'], $this->connection);
+				$ok = @mysql_set_charset($config['charset'], $this->connection); // intentionally @
 			}
-			if (!$ok) $ok = @mysql_query("SET NAMES '$config[charset]'", $this->connection);
+			if (!$ok) $ok = @mysql_query("SET NAMES '$config[charset]'", $this->connection); // intentionally @
 			if (!$ok) $this->throwException();
 		}
 
 		if (isset($config['database'])) {
-			@mysql_select_db($config['database'], $this->connection) or $this->throwException();
+			@mysql_select_db($config['database'], $this->connection) or $this->throwException(); // intentionally @
 		}
 
 		if (isset($config['sqlmode'])) {
-			if (!@mysql_query("SET sql_mode='$config[sqlmode]'", $this->connection)) $this->throwException();
+			if (!@mysql_query("SET sql_mode='$config[sqlmode]'", $this->connection)) $this->throwException(); // intentionally @
 		}
 
 		$this->buffered = empty($config['unbuffered']);
@@ -164,9 +164,9 @@ class DibiMySqlDriver extends /*Nette::*/Object implements IDibiDriver
 	public function query($sql)
 	{
 		if ($this->buffered) {
-			$this->resultset = @mysql_query($sql, $this->connection);
+			$this->resultset = @mysql_query($sql, $this->connection); // intentionally @
 		} else {
-			$this->resultset = @mysql_unbuffered_query($sql, $this->connection);
+			$this->resultset = @mysql_unbuffered_query($sql, $this->connection); // intentionally @
 		}
 
 		if (mysql_errno($this->connection)) {
diff --git a/dibi/drivers/mysqli.php b/dibi/drivers/mysqli.php
index 3cbaa34..bfbdd66 100644
--- a/dibi/drivers/mysqli.php
+++ b/dibi/drivers/mysqli.php
@@ -101,7 +101,7 @@ class DibiMySqliDriver extends /*Nette::*/Object implements IDibiDriver
 		}
 
 		$this->connection = mysqli_init();
-		@mysqli_real_connect($this->connection, $config['host'], $config['username'], $config['password'], $config['database'], $config['port'], $config['socket'], $config['options']);
+		@mysqli_real_connect($this->connection, $config['host'], $config['username'], $config['password'], $config['database'], $config['port'], $config['socket'], $config['options']); // intentionally @
 
 		if ($errno = mysqli_connect_errno()) {
 			throw new DibiDriverException(mysqli_connect_error(), $errno);
@@ -111,14 +111,14 @@ class DibiMySqliDriver extends /*Nette::*/Object implements IDibiDriver
 			$ok = FALSE;
 			if (version_compare(PHP_VERSION , '5.1.5', '>=')) {
 				// affects the character set used by mysql_real_escape_string() (was added in MySQL 5.0.7 and PHP 5.0.5, fixed in PHP 5.1.5)
-				$ok = @mysqli_set_charset($this->connection, $config['charset']);
+				$ok = @mysqli_set_charset($this->connection, $config['charset']); // intentionally @
 			}
-			if (!$ok) $ok = @mysqli_query($this->connection, "SET NAMES '$config[charset]'");
+			if (!$ok) $ok = @mysqli_query($this->connection, "SET NAMES '$config[charset]'"); // intentionally @
 			if (!$ok) $this->throwException();
 		}
 
 		if (isset($config['sqlmode'])) {
-			if (!@mysqli_query($this->connection, "SET sql_mode='$config[sqlmode]'")) $this->throwException();
+			if (!@mysqli_query($this->connection, "SET sql_mode='$config[sqlmode]'")) $this->throwException(); // intentionally @
 		}
 
 		$this->buffered = empty($config['unbuffered']);
@@ -147,7 +147,7 @@ class DibiMySqliDriver extends /*Nette::*/Object implements IDibiDriver
 	 */
 	public function query($sql)
 	{
-		$this->resultset = @mysqli_query($this->connection, $sql, $this->buffered ? MYSQLI_STORE_RESULT : MYSQLI_USE_RESULT);
+		$this->resultset = @mysqli_query($this->connection, $sql, $this->buffered ? MYSQLI_STORE_RESULT : MYSQLI_USE_RESULT); // intentionally @
 
 		if (mysqli_errno($this->connection)) {
 			$this->throwException($sql);
diff --git a/dibi/drivers/odbc.php b/dibi/drivers/odbc.php
index 1e90ab8..87d46b1 100644
--- a/dibi/drivers/odbc.php
+++ b/dibi/drivers/odbc.php
@@ -87,9 +87,9 @@ class DibiOdbcDriver extends /*Nette::*/Object implements IDibiDriver
 		if (!isset($config['dsn'])) $config['dsn'] = ini_get('odbc.default_db');
 
 		if (empty($config['persistent'])) {
-			$this->connection = @odbc_connect($config['dsn'], $config['username'], $config['password']);
+			$this->connection = @odbc_connect($config['dsn'], $config['username'], $config['password']); // intentionally @
 		} else {
-			$this->connection = @odbc_pconnect($config['dsn'], $config['username'], $config['password']);
+			$this->connection = @odbc_pconnect($config['dsn'], $config['username'], $config['password']); // intentionally @
 		}
 
 		if (!is_resource($this->connection)) {
@@ -120,7 +120,7 @@ class DibiOdbcDriver extends /*Nette::*/Object implements IDibiDriver
 	 */
 	public function query($sql)
 	{
-		$this->resultset = @odbc_exec($this->connection, $sql);
+		$this->resultset = @odbc_exec($this->connection, $sql); // intentionally @
 
 		if ($this->resultset === FALSE) {
 			$this->throwException($sql);
diff --git a/dibi/drivers/oracle.php b/dibi/drivers/oracle.php
index b21c3a9..6292a39 100644
--- a/dibi/drivers/oracle.php
+++ b/dibi/drivers/oracle.php
@@ -82,7 +82,7 @@ class DibiOracleDriver extends /*Nette::*/Object implements IDibiDriver
 		DibiConnection::alias($config, 'database', 'db');
 		DibiConnection::alias($config, 'charset');
 
-		$this->connection = @oci_new_connect($config['username'], $config['password'], $config['database'], $config['charset']);
+		$this->connection = @oci_new_connect($config['username'], $config['password'], $config['database'], $config['charset']); // intentionally @
 
 		if (!$this->connection) {
 			$err = oci_error();
diff --git a/dibi/drivers/pdo.php b/dibi/drivers/pdo.php
index 7133bea..3acddd0 100644
--- a/dibi/drivers/pdo.php
+++ b/dibi/drivers/pdo.php
@@ -316,7 +316,7 @@ class DibiPdoDriver extends /*Nette::*/Object implements IDibiDriver
 		$meta = array();
 		for ($i = 0; $i < $count; $i++) {
 			// items 'name' and 'table' are required
-			$info = @$this->resultset->getColumnsMeta($i);
+			$info = @$this->resultset->getColumnsMeta($i); // intentionally @
 			if ($info === FALSE) {
 				throw new DibiDriverException('Driver does not support meta data.');
 			}
diff --git a/dibi/drivers/postgre.php b/dibi/drivers/postgre.php
index 9181ea9..4f6fcb4 100644
--- a/dibi/drivers/postgre.php
+++ b/dibi/drivers/postgre.php
@@ -58,13 +58,6 @@ class DibiPostgreDriver extends /*Nette::*/Object implements IDibiDriver
 	private $escMethod = FALSE;
 
 
-	/**
-	 * Affected rows.
-	 * @var int|FALSE
-	 */
-	private $affectedRows = FALSE;
-
-
 
 	/**
 	 * @throws DibiException
@@ -148,16 +141,13 @@ class DibiPostgreDriver extends /*Nette::*/Object implements IDibiDriver
 	 */
 	public function query($sql)
 	{
-		$this->resultset = @pg_query($this->connection, $sql);
+		$this->resultset = @pg_query($this->connection, $sql); // intentionally @
 
 		if ($this->resultset === FALSE) {
-			$this->affectedRows = FALSE;
 			throw new DibiDriverException(pg_last_error($this->connection), 0, $sql);
 		}
 
-		$this->affectedRows = pg_affected_rows($this->resultset); // retrieve immediately due PHP bug
-
-		return is_resource($this->resultset);
+		return is_resource($this->resultset) && pg_num_fields($this->resultset);
 	}
 
 
@@ -169,7 +159,7 @@ class DibiPostgreDriver extends /*Nette::*/Object implements IDibiDriver
 	 */
 	public function affectedRows()
 	{
-		return $this->affectedRows;
+		return pg_affected_rows($this->resultset);
 	}
 
 
diff --git a/dibi/drivers/sqlite.php b/dibi/drivers/sqlite.php
index 75ce413..ec35519 100644
--- a/dibi/drivers/sqlite.php
+++ b/dibi/drivers/sqlite.php
@@ -92,9 +92,9 @@ class DibiSqliteDriver extends /*Nette::*/Object implements IDibiDriver
 
 		$errorMsg = '';
 		if (empty($config['persistent'])) {
-			$this->connection = @sqlite_open($config['database'], 0666, $errorMsg);
+			$this->connection = @sqlite_open($config['database'], 0666, $errorMsg); // intentionally @
 		} else {
-			$this->connection = @sqlite_popen($config['database'], 0666, $errorMsg);
+			$this->connection = @sqlite_popen($config['database'], 0666, $errorMsg); // intentionally @
 		}
 
 		if (!$this->connection) {
diff --git a/dibi/libs/DibiConnection.php b/dibi/libs/DibiConnection.php
index 8c2d86d..1982be1 100644
--- a/dibi/libs/DibiConnection.php
+++ b/dibi/libs/DibiConnection.php
@@ -90,7 +90,7 @@ class DibiConnection extends /*Nette::*/Object
 		}
 
 		if (isset($config['result:objects'])) {
-            // normalize
+			// normalize
 			$val = $config['result:objects'];
 			$config['result:objects'] = is_string($val) && !is_numeric($val) ? $val : (bool) $val;
 		}
@@ -154,6 +154,18 @@ class DibiConnection extends /*Nette::*/Object
 
 
 
+	/**
+	 * Returns TRUE when connection was established.
+	 *
+	 * @return bool
+	 */
+	final public function isConnected()
+	{
+		return $this->connected;
+	}
+
+
+
 	/**
 	 * Returns configuration variable. If no $key is passed, returns the entire array.
 	 *
@@ -411,9 +423,9 @@ class DibiConnection extends /*Nette::*/Object
 	{
 		$this->connect();
 
-		@set_time_limit(0);
+		@set_time_limit(0); // intentionally @
 
-		$handle = @fopen($file, 'r');
+		$handle = @fopen($file, 'r'); // intentionally @
 		if (!$handle) {
 			throw new FileNotFoundException("Cannot open file '$file'.");
 		}
diff --git a/dibi/libs/DibiResult.php b/dibi/libs/DibiResult.php
index 002f4b0..6d559ae 100644
--- a/dibi/libs/DibiResult.php
+++ b/dibi/libs/DibiResult.php
@@ -117,7 +117,7 @@ class DibiResult extends /*Nette::*/Object implements IDataSource
 	 */
 	public function __destruct()
 	{
-		@$this->free();
+		@$this->free(); // intentionally @
 	}
 
 
diff --git a/dibi/libs/DibiTranslator.php b/dibi/libs/DibiTranslator.php
index fc009c2..471e7c8 100644
--- a/dibi/libs/DibiTranslator.php
+++ b/dibi/libs/DibiTranslator.php
@@ -131,9 +131,9 @@ final class DibiTranslator extends /*Nette::*/Object
 					)/xs',
 */                  // note: this can change $this->args & $this->cursor & ...
 					 . preg_replace_callback('/(?=`|\[|\'|"|%)(?:`(.+?)`|\[(.+?)\]|(\')((?:\'\'|[^\'])*)\'|(")((?:""|[^"])*)"|(\'|")|%([a-zA-Z]{1,4})(?![a-zA-Z]))/s',
-						   array($this, 'cb'),
-						   substr($arg, $toSkip)
-					   );
+							array($this, 'cb'),
+							substr($arg, $toSkip)
+					);
 
 				}
 				continue;
@@ -302,9 +302,9 @@ final class DibiTranslator extends /*Nette::*/Object
 				} else {
 					return substr($value, 0, $toSkip)
 					 . preg_replace_callback('/(?=`|\[|\'|")(?:`(.+?)`|\[(.+?)\]|(\')((?:\'\'|[^\'])*)\'|(")((?:""|[^"])*)"(\'|"))/s',
-						   array($this, 'cb'),
-						   substr($value, $toSkip)
-					   );
+							array($this, 'cb'),
+							substr($value, $toSkip)
+					);
 				}
 
 			case 'a':
diff --git a/dibi/libs/interfaces.php b/dibi/libs/interfaces.php
index 2034e25..bbf5894 100644
--- a/dibi/libs/interfaces.php
+++ b/dibi/libs/interfaces.php
@@ -85,6 +85,15 @@ interface IDibiDriver
 
 
 
+	/**
+	 * Returns TRUE when connection was established.
+	 *
+	 * @return bool
+	 */
+	function isConnected();
+
+
+
 	/**
 	 * Internal: Executes the SQL query.
 	 *