diff --git a/lib/Doctrine/ORM/Query/Filter/SQLFilter.php b/lib/Doctrine/ORM/Query/Filter/SQLFilter.php
index 9f7307445..9477636e3 100644
--- a/lib/Doctrine/ORM/Query/Filter/SQLFilter.php
+++ b/lib/Doctrine/ORM/Query/Filter/SQLFilter.php
@@ -45,17 +45,19 @@ abstract class SQLFilter
     final function setParameter($name, $value, $type)
     {
         // @todo: check for a valid type?
-        $parameters[$name] = array('value' => $value, 'type' => $type);
+        $this->parameters[$name] = array('value' => $value, 'type' => $type);
+
+        return $this;
     }
 
     final function getParameter($name)
     {
-        if(!isset($parameters[$name])) {
-            throw new \InvalidArgumentException("Parameter '" . $name . "' is does not exist.");
+        if(!isset($this->parameters[$name])) {
+            throw new \InvalidArgumentException("Parameter '" . $name . "' does not exist.");
         }
 
         // @todo: espace the parameter
-        return $paramaters[$name]['value'];
+        return $this->conn->convertToDatabaseValue($this->parameters[$name]['value'], $this->parameters[$name]['type']);
     }
 
     abstract function addFilterConstraint(ClassMetadata $targetEntity, $targetTableAlias);
diff --git a/tests/Doctrine/Tests/ORM/Functional/SQLFilterTest.php b/tests/Doctrine/Tests/ORM/Functional/SQLFilterTest.php
index 3cb3ce426..482ddb534 100644
--- a/tests/Doctrine/Tests/ORM/Functional/SQLFilterTest.php
+++ b/tests/Doctrine/Tests/ORM/Functional/SQLFilterTest.php
@@ -4,6 +4,7 @@ namespace Doctrine\Tests\ORM\Functional;
 
 use Doctrine\ORM\Query\Filter\SQLFilter;
 use Doctrine\ORM\Mapping\ClassMetaData;
+use Doctrine\DBAL\Types\Type;
 
 require_once __DIR__ . '/../../TestInit.php';
 
@@ -127,6 +128,51 @@ class SQLFilterTest extends \Doctrine\Tests\OrmFunctionalTestCase
         $config->addFilter("locale", "\Doctrine\Tests\ORM\Functional\MyLocaleFilter");
         $config->addFilter("soft_delete", "\Doctrine\Tests\ORM\Functional\MySoftDeleteFilter");
     }
+
+    protected function getMockConnection()
+    {
+        // Setup connection mock
+        $conn = $this->getMockBuilder('Doctrine\DBAL\Connection')
+            ->disableOriginalConstructor()
+            ->getMock();
+
+        return $conn;
+    }
+
+    public function testSQLFilterGetSetParameter()
+    {
+        // Setup mock connection
+        $conn = $this->getMockConnection();
+        $conn->expects($this->once())
+            ->method('convertToDatabaseValue')
+            ->with($this->equalTo('en'))
+            ->will($this->returnValue("'en'"));
+
+        $filter = new MyLocaleFilter($conn);
+
+        $filter->setParameter('locale', 'en', Type::STRING);
+
+        $this->assertEquals("'en'", $filter->getParameter('locale'));
+    }
+
+    public function testSQLFilterAddConstraint()
+    {
+        // Set up metadata mock
+        $targetEntity = $this->getMockBuilder('Doctrine\ORM\Mapping\ClassMetadata')
+            ->disableOriginalConstructor()
+            ->getMock();
+
+        $filter = new MySoftDeleteFilter($this->getMockConnection());
+
+        // Test for an entity that gets extra filter data
+        $targetEntity->name = 'MyEntity\SoftDeleteNewsItem';
+        $this->assertEquals('t1_.deleted = 0', $filter->addFilterConstraint($targetEntity, 't1_'));
+
+        // Test for an entity that doesn't get extra filter data
+        $targetEntity->name = 'MyEntity\NoSoftDeleteNewsItem';
+        $this->assertEquals('', $filter->addFilterConstraint($targetEntity, 't1_'));
+
+    }
 }
 
 class MySoftDeleteFilter extends SQLFilter