diff --git a/src/Database/SqlPreprocessor.php b/src/Database/SqlPreprocessor.php
index d87f6dfbc..ad3ef7f43 100644
--- a/src/Database/SqlPreprocessor.php
+++ b/src/Database/SqlPreprocessor.php
@@ -33,6 +33,15 @@ class SqlPreprocessor
 		'GROUP BY' => 'order',
 	];
 
+	private const PARAMETRIC_COMMANDS = [
+		'SELECT' => 1,
+		'INSERT' => 1,
+		'UPDATE' => 1,
+		'DELETE' => 1,
+		'REPLACE' => 1,
+		'EXPLAIN' => 1,
+	];
+
 	/** @var Connection */
 	private $connection;
 
@@ -48,6 +57,9 @@ class SqlPreprocessor
 	/** @var int */
 	private $counter;
 
+	/** @var bool */
+	private $useParams;
+
 	/** @var string values|set|and|order */
 	private $arrayMode;
 
@@ -62,13 +74,14 @@ public function __construct(Connection $connection)
 	/**
 	 * @return array of [sql, params]
 	 */
-	public function process(array $params): array
+	public function process(array $params, bool $useParams = false): array
 	{
 		$this->params = $params;
 		$this->counter = 0;
 		$prev = -1;
 		$this->remaining = [];
 		$this->arrayMode = null;
+		$this->useParams = $useParams;
 		$res = [];
 
 		while ($this->counter < count($params)) {
@@ -83,7 +96,7 @@ public function process(array $params): array
 				$this->arrayMode = null;
 				$res[] = Nette\Utils\Strings::replace(
 					$param,
-					'~\'[^\']*+\'|"[^"]*+"|\?[a-z]*|^\s*+(?:INSERT|REPLACE)\b|\b(?:SET|WHERE|HAVING|ORDER BY|GROUP BY|KEY UPDATE)(?=\s*\z|\s*\?)|/\*.*?\*/|--[^\n]*~si',
+					'~\'[^\']*+\'|"[^"]*+"|\?[a-z]*|^\s*+(?:SELECT|INSERT|UPDATE|DELETE|REPLACE|EXPLAIN)\b|\b(?:SET|WHERE|HAVING|ORDER BY|GROUP BY|KEY UPDATE)(?=\s*\z|\s*\?)|/\*.*?\*/|--[^\n]*~si',
 					[$this, 'callback']
 				);
 			} else {
@@ -110,7 +123,8 @@ public function callback(array $m): string
 
 		} else { // command
 			$cmd = ltrim(strtoupper($m));
-			$this->arrayMode = self::ARRAY_MODES[$cmd];
+			$this->arrayMode = self::ARRAY_MODES[$cmd] ?? null;
+			$this->useParams = isset(self::PARAMETRIC_COMMANDS[$cmd]) || $this->useParams;
 			return $m;
 		}
 	}
@@ -120,8 +134,15 @@ private function formatValue($value, string $mode = null): string
 	{
 		if (!$mode || $mode === 'auto') {
 			if (is_scalar($value) || is_resource($value)) {
-				$this->remaining[] = $value;
-				return '?';
+				if ($this->useParams) {
+					$this->remaining[] = $value;
+					return '?';
+				} else {
+					if (is_resource($value)) {
+						$value = stream_get_contents($value);
+					}
+					return $this->connection->quote($value);
+				}
 
 			} elseif ($value === null) {
 				return 'NULL';
@@ -132,7 +153,7 @@ private function formatValue($value, string $mode = null): string
 
 			} elseif ($value instanceof SqlLiteral) {
 				$prep = clone $this;
-				[$res, $params] = $prep->process(array_merge([$value->__toString()], $value->getParameters()));
+				[$res, $params] = $prep->process(array_merge([$value->__toString()], $value->getParameters()), $this->useParams);
 				$this->remaining = array_merge($this->remaining, $params);
 				return $res;
 
diff --git a/tests/Database/SqlPreprocessor.phpt b/tests/Database/SqlPreprocessor.phpt
index 38b0c0f58..90d277812 100644
--- a/tests/Database/SqlPreprocessor.phpt
+++ b/tests/Database/SqlPreprocessor.phpt
@@ -309,8 +309,8 @@ test(function () use ($preprocessor) { // insert
 	[$sql, $params] = $preprocessor->process(['/* comment */  INSERT INTO author',
 		['name' => 'Catelyn Stark'],
 	]);
-	Assert::same(reformat('/* comment */  INSERT INTO author [name]=?'), $sql); // autodetection not used
-	Assert::same(['Catelyn Stark'], $params);
+	Assert::same(reformat("/* comment */  INSERT INTO author [name]='Catelyn Stark'"), $sql); // autodetection not used
+	Assert::same([], $params);
 });