diff --git a/lib/Db/Asset.php b/lib/Db/Asset.php
index 2359e935ff..a950f1b310 100644
--- a/lib/Db/Asset.php
+++ b/lib/Db/Asset.php
@@ -7,6 +7,7 @@
 namespace OCA\Richdocuments\Db;
 
 use OCP\AppFramework\Db\Entity;
+use OCP\DB\Types;
 
 /**
  * @method void setUid(string $uid)
@@ -32,9 +33,9 @@ class Asset extends Entity {
 	protected $timestamp;
 
 	public function __construct() {
-		$this->addType('uid', 'string');
-		$this->addType('fileid', 'int');
-		$this->addType('token', 'string');
-		$this->addType('timestamp', 'int');
+		$this->addType('uid', Types::STRING);
+		$this->addType('fileid', Types::INTEGER);
+		$this->addType('token', Types::STRING);
+		$this->addType('timestamp', Types::INTEGER);
 	}
 }
diff --git a/lib/Db/Direct.php b/lib/Db/Direct.php
index 3ab39f93df..35fa87ab7f 100644
--- a/lib/Db/Direct.php
+++ b/lib/Db/Direct.php
@@ -7,6 +7,7 @@
 namespace OCA\Richdocuments\Db;
 
 use OCP\AppFramework\Db\Entity;
+use OCP\DB\Types;
 
 /**
  * @method void setToken(string $token)
@@ -51,14 +52,14 @@ class Direct extends Entity {
 	protected $initiatorToken;
 
 	public function __construct() {
-		$this->addType('token', 'string');
-		$this->addType('uid', 'string');
-		$this->addType('fileid', 'int');
-		$this->addType('timestamp', 'int');
-		$this->addType('templateDestination', 'int');
-		$this->addType('templateId', 'int');
-		$this->addType('share', 'string');
-		$this->addType('initiatorHost', 'string');
-		$this->addType('initiatorToken', 'string');
+		$this->addType('token', Types::STRING);
+		$this->addType('uid', Types::STRING);
+		$this->addType('fileid', Types::INTEGER);
+		$this->addType('timestamp', Types::INTEGER);
+		$this->addType('templateDestination', Types::INTEGER);
+		$this->addType('templateId', Types::INTEGER);
+		$this->addType('share', Types::STRING);
+		$this->addType('initiatorHost', Types::STRING);
+		$this->addType('initiatorToken', Types::STRING);
 	}
 }
diff --git a/lib/Db/Wopi.php b/lib/Db/Wopi.php
index 14d12f3071..729c8a8cf3 100644
--- a/lib/Db/Wopi.php
+++ b/lib/Db/Wopi.php
@@ -6,6 +6,7 @@
 namespace OCA\Richdocuments\Db;
 
 use OCP\AppFramework\Db\Entity;
+use OCP\DB\Types;
 
 /**
  * @package OCA\Richdocuments\Db
@@ -119,20 +120,20 @@ class Wopi extends Entity implements \JsonSerializable {
 	protected $tokenType = 0;
 
 	public function __construct() {
-		$this->addType('ownerUid', 'string');
-		$this->addType('editorUid', 'string');
-		$this->addType('fileid', 'int');
-		$this->addType('version', 'int');
-		$this->addType('canwrite', 'bool');
-		$this->addType('serverHost', 'string');
-		$this->addType('token', 'string');
-		$this->addType('expiry', 'int');
-		$this->addType('guestDisplayname', 'string');
-		$this->addType('templateDestination', 'int');
-		$this->addType('templateId', 'int');
-		$this->addType('hideDownload', 'bool');
-		$this->addType('direct', 'bool');
-		$this->addType('tokenType', 'int');
+		$this->addType('ownerUid', Types::STRING);
+		$this->addType('editorUid', Types::STRING);
+		$this->addType('fileid', Types::INTEGER);
+		$this->addType('version', Types::INTEGER);
+		$this->addType('canwrite', Types::BOOLEAN);
+		$this->addType('serverHost', Types::STRING);
+		$this->addType('token', Types::STRING);
+		$this->addType('expiry', Types::INTEGER);
+		$this->addType('guestDisplayname', Types::STRING);
+		$this->addType('templateDestination', Types::INTEGER);
+		$this->addType('templateId', Types::INTEGER);
+		$this->addType('hideDownload', Types::BOOLEAN);
+		$this->addType('direct', Types::BOOLEAN);
+		$this->addType('tokenType', Types::INTEGER);
 	}
 
 	public function hasTemplateId() {