diff --git a/README.md b/README.md
index 2d6779d..af6d908 100644
--- a/README.md
+++ b/README.md
@@ -225,12 +225,12 @@ User::query(new \Aternos\Model\Query\SelectQuery(
         new \Aternos\Model\Query\WhereGroup([
             new \Aternos\Model\Query\WhereCondition("hello", "world"),
             new \Aternos\Model\Query\WhereCondition("foo", "bar")
-        ], \Aternos\Model\Query\WhereGroup:: OR)
+        ], \Aternos\Model\Query\Conjunction::OR)
     ]),
     [
-        new \Aternos\Model\Query\OrderField("field", \Aternos\Model\Query\OrderField::DESCENDING),
-        new \Aternos\Model\Query\OrderField("hello", \Aternos\Model\Query\OrderField::ASCENDING),
-        new \Aternos\Model\Query\OrderField("foo", \Aternos\Model\Query\OrderField::DESCENDING)
+        new \Aternos\Model\Query\OrderField("field", \Aternos\Model\Query\Direction::DESCENDING),
+        new \Aternos\Model\Query\OrderField("hello", \Aternos\Model\Query\Direction::ASCENDING),
+        new \Aternos\Model\Query\OrderField("foo", \Aternos\Model\Query\Direction::DESCENDING)
     ],
     [
         new \Aternos\Model\Query\SelectField("field"), 
diff --git a/src/Driver/Cassandra/Cassandra.php b/src/Driver/Cassandra/Cassandra.php
index 039b08d..97f3abe 100644
--- a/src/Driver/Cassandra/Cassandra.php
+++ b/src/Driver/Cassandra/Cassandra.php
@@ -26,7 +26,7 @@
  */
 class Cassandra extends Driver implements CRUDAbleInterface, QueryableInterface
 {
-    public const ID = "cassandra";
+    public const string ID = "cassandra";
     protected string $id = self::ID;
 
     /**
diff --git a/src/Driver/Mysqli/Mysqli.php b/src/Driver/Mysqli/Mysqli.php
index 8f36209..bea4b6b 100644
--- a/src/Driver/Mysqli/Mysqli.php
+++ b/src/Driver/Mysqli/Mysqli.php
@@ -27,7 +27,7 @@
  */
 class Mysqli extends Driver implements CRUDAbleInterface, CRUDQueryableInterface
 {
-    public const ID = "mysqli";
+    public const string ID = "mysqli";
     protected string $id = self::ID;
 
     /**
diff --git a/src/Driver/OpenSearch/OpenSearch.php b/src/Driver/OpenSearch/OpenSearch.php
index 4ca5672..d746f70 100644
--- a/src/Driver/OpenSearch/OpenSearch.php
+++ b/src/Driver/OpenSearch/OpenSearch.php
@@ -30,7 +30,7 @@
  */
 class OpenSearch extends Driver implements CRUDAbleInterface, SearchableInterface
 {
-    public const ID = "opensearch";
+    public const string ID = "opensearch";
     protected string $id = self::ID;
 
     /**
diff --git a/src/Driver/Redis/Redis.php b/src/Driver/Redis/Redis.php
index 85cca3f..6e292f9 100644
--- a/src/Driver/Redis/Redis.php
+++ b/src/Driver/Redis/Redis.php
@@ -20,7 +20,7 @@
  */
 class Redis extends Driver implements CRUDAbleInterface, CacheableInterface
 {
-    public const ID = "redis";
+    public const string ID = "redis";
     protected string $id = self::ID;
 
     /**
diff --git a/src/Driver/Test/TestDriver.php b/src/Driver/Test/TestDriver.php
index dde1fdd..794412d 100644
--- a/src/Driver/Test/TestDriver.php
+++ b/src/Driver/Test/TestDriver.php
@@ -13,7 +13,7 @@
 
 class TestDriver extends Driver implements CRUDAbleInterface, CRUDQueryableInterface
 {
-    public const ID = "test";
+    public const string ID = "test";
     protected string $id = self::ID;
 
     /**
diff --git a/src/Driver/Test/TestTable.php b/src/Driver/Test/TestTable.php
index a60bbb6..b9bc04f 100644
--- a/src/Driver/Test/TestTable.php
+++ b/src/Driver/Test/TestTable.php
@@ -5,6 +5,7 @@
 use Aternos\Model\ModelInterface;
 use Aternos\Model\ModelRegistry;
 use Aternos\Model\Query\DeleteQuery;
+use Aternos\Model\Query\Direction;
 use Aternos\Model\Query\GroupField;
 use Aternos\Model\Query\OrderField;
 use Aternos\Model\Query\Query;
@@ -167,7 +168,7 @@ protected function compareEntries(TestTableEntry $a, TestTableEntry $b, array $o
             if ($aValue === $bValue) {
                 continue;
             }
-            if ($orderField->direction === OrderField::ASCENDING) {
+            if ($orderField->direction === Direction::ASCENDING) {
                 return $aValue > $bValue ? 1 : -1;
             } else {
                 return $aValue < $bValue ? 1 : -1;
diff --git a/src/Driver/Test/TestTableEntry.php b/src/Driver/Test/TestTableEntry.php
index e43b604..99311af 100644
--- a/src/Driver/Test/TestTableEntry.php
+++ b/src/Driver/Test/TestTableEntry.php
@@ -3,7 +3,7 @@
 namespace Aternos\Model\Driver\Test;
 
 use Aternos\Model\ModelInterface;
-use Aternos\Model\Query\Field;
+use Aternos\Model\Query\Conjunction;
 use Aternos\Model\Query\SelectField;
 use Aternos\Model\Query\UpdateField;
 use Aternos\Model\Query\WhereCondition;
@@ -42,14 +42,14 @@ public function matchesWhereGroup(?WhereGroup $where): bool
             } else if ($condition instanceof WhereCondition) {
                 $matches = $this->matchesWhereCondition($condition);
             }
-            if ($where->conjunction === WhereGroup::AND && !$matches) {
+            if ($where->conjunction === Conjunction::AND && !$matches) {
                 return false;
             }
-            if ($where->conjunction === WhereGroup::OR && $matches) {
+            if ($where->conjunction === Conjunction::OR && $matches) {
                 return true;
             }
         }
-        return $where->conjunction === WhereGroup::AND;
+        return $where->conjunction === Conjunction::AND;
     }
 
     /**
diff --git a/src/GenericModel.php b/src/GenericModel.php
index 30c3b11..9f55f5c 100644
--- a/src/GenericModel.php
+++ b/src/GenericModel.php
@@ -18,7 +18,8 @@
 };
 use Aternos\Model\Driver\Mysqli\Mysqli;
 use Aternos\Model\Driver\Redis\Redis;
-use Aternos\Model\Query\{CountField,
+use Aternos\Model\Query\{Conjunction,
+    CountField,
     DeleteQuery,
     GroupField,
     Limit,
@@ -28,8 +29,7 @@
     SelectQuery,
     UpdateQuery,
     WhereCondition,
-    WhereGroup
-};
+    WhereGroup};
 use Aternos\Model\Search\Search;
 use Aternos\Model\Search\SearchResult;
 use BadMethodCallException;
@@ -441,7 +441,7 @@ public static function query(Query $query): QueryResult
         $query->modelClassName = static::class;
 
         if (static::$filters !== null && count(static::$filters) > 0) {
-            $wrappedWhereGroup = new WhereGroup(conjunction: WhereGroup::AND);
+            $wrappedWhereGroup = new WhereGroup(conjunction: Conjunction::AND);
             foreach (static::$filters as $key => $value) {
                 $wrappedWhereGroup->add(new WhereCondition($key, $value));
             }
diff --git a/src/Query/Conjunction.php b/src/Query/Conjunction.php
new file mode 100644
index 0000000..976dcef
--- /dev/null
+++ b/src/Query/Conjunction.php
@@ -0,0 +1,9 @@
+<?php
+
+namespace Aternos\Model\Query;
+
+enum Conjunction
+{
+    case AND;
+    case OR;
+}
\ No newline at end of file
diff --git a/src/Query/CountField.php b/src/Query/CountField.php
index f54e1e6..43f0991 100644
--- a/src/Query/CountField.php
+++ b/src/Query/CountField.php
@@ -9,7 +9,7 @@
  */
 class CountField extends SelectField
 {
-    public const COUNT_FIELD = "count";
+    public const string COUNT_FIELD = "count";
 
     public ?int $function = self::COUNT;
     public ?string $alias = self::COUNT_FIELD;
diff --git a/src/Query/Direction.php b/src/Query/Direction.php
new file mode 100644
index 0000000..27aef82
--- /dev/null
+++ b/src/Query/Direction.php
@@ -0,0 +1,9 @@
+<?php
+
+namespace Aternos\Model\Query;
+
+enum Direction
+{
+    case ASCENDING;
+    case DESCENDING;
+}
diff --git a/src/Query/Generator/SQL.php b/src/Query/Generator/SQL.php
index 5a57cdf..e12a649 100644
--- a/src/Query/Generator/SQL.php
+++ b/src/Query/Generator/SQL.php
@@ -2,7 +2,9 @@
 
 namespace Aternos\Model\Query\Generator;
 
-use Aternos\Model\Query\{DeleteQuery,
+use Aternos\Model\Query\{Conjunction,
+    DeleteQuery,
+    Direction,
     OrderField,
     Query,
     SelectField,
@@ -11,7 +13,6 @@
     UpdateQuery,
     WhereCondition,
     WhereGroup};
-use UnexpectedValueException;
 
 /**
  * Class SQL
@@ -139,9 +140,8 @@ private function generateWhere(Query $query, WhereCondition|WhereGroup|null $whe
             return $field . " " . $where->operator . " " . $value;
         } elseif ($where instanceof WhereGroup) {
             $conjunction = match ($where->conjunction) {
-                WhereGroup:: AND => " AND ",
-                WhereGroup:: OR => " OR ",
-                default => throw new UnexpectedValueException("Invalid conjunction: " . $where->conjunction),
+                Conjunction::AND => " AND ",
+                Conjunction::OR => " OR ",
             };
 
             $whereStrings = [];
@@ -171,9 +171,8 @@ private function generateOrder(Query $query): string
         foreach ($orderFields as $orderField) {
             /** @var OrderField $orderField */
             $direction = match ($orderField->direction) {
-                OrderField::ASCENDING => "ASC",
-                OrderField::DESCENDING => "DESC",
-                default => throw new UnexpectedValueException("Invalid direction: " . $orderField->direction),
+                Direction::ASCENDING => "ASC",
+                Direction::DESCENDING => "DESC",
             };
 
             if ($orderField->raw) {
diff --git a/src/Query/OrderField.php b/src/Query/OrderField.php
index b74ca52..3cbd9b7 100644
--- a/src/Query/OrderField.php
+++ b/src/Query/OrderField.php
@@ -9,11 +9,6 @@
  */
 class OrderField
 {
-    /**
-     * Direction constants
-     */
-    const ASCENDING = 0;
-    const DESCENDING = 1;
 
     /**
      * Field name to order by
@@ -30,17 +25,17 @@ class OrderField
     /**
      * Order direction
      *
-     * @var int
+     * @var Direction
      */
-    public int $direction = self::ASCENDING;
+    public Direction $direction = Direction::ASCENDING;
 
     /**
      * OrderField constructor.
      *
      * @param string|null $field
-     * @param int $direction
+     * @param Direction $direction
      */
-    public function __construct(?string $field = null, int $direction = self::ASCENDING)
+    public function __construct(?string $field = null, Direction $direction = Direction::ASCENDING)
     {
         $this->field = $field;
         $this->direction = $direction;
@@ -57,10 +52,10 @@ public function setRaw(bool $raw): OrderField
     }
 
     /**
-     * @param int $direction
+     * @param Direction $direction
      * @return OrderField
      */
-    public function setDirection(int $direction): OrderField
+    public function setDirection(Direction $direction): OrderField
     {
         $this->direction = $direction;
         return $this;
diff --git a/src/Query/Query.php b/src/Query/Query.php
index 0023752..9acc187 100644
--- a/src/Query/Query.php
+++ b/src/Query/Query.php
@@ -109,12 +109,14 @@ public function orderBy(array $order): static
                 continue;
             }
 
-            if (!is_int($value)) {
+            if (is_string($value)) {
                 $value = match (strtoupper($value)) {
-                    "ASCENDING", "ASC" => OrderField::ASCENDING,
-                    "DESCENDING", "DESC" => OrderField::DESCENDING,
+                    "ASCENDING", "ASC" => Direction::ASCENDING,
+                    "DESCENDING", "DESC" => Direction::DESCENDING,
                     default => throw new InvalidArgumentException('Argument $order contains invalid order direction: ' . $value),
                 };
+            } else if (!($value instanceof Direction)) {
+                throw new InvalidArgumentException('Argument $order contains invalid order direction: ' . $value);
             }
 
             $this->order[] = new OrderField($key, $value);
diff --git a/src/Query/WhereGroup.php b/src/Query/WhereGroup.php
index 0ea6d60..6b90e09 100644
--- a/src/Query/WhereGroup.php
+++ b/src/Query/WhereGroup.php
@@ -12,11 +12,6 @@
  */
 class WhereGroup implements Iterator, Countable
 {
-    /**
-     * Conjunction values
-     */
-    const AND = 0;
-    const OR = 1;
 
     /**
      * Multiple WhereGroup or WhereCondition objects
@@ -26,9 +21,9 @@ class WhereGroup implements Iterator, Countable
     protected array $group = [];
 
     /**
-     * @var int
+     * @var Conjunction
      */
-    public int $conjunction = self:: AND;
+    public Conjunction $conjunction = Conjunction::AND;
 
     /**
      * Group iterator
@@ -41,9 +36,9 @@ class WhereGroup implements Iterator, Countable
      * WhereGroup constructor.
      *
      * @param array $conditions
-     * @param int $conjunction
+     * @param Conjunction $conjunction
      */
-    public function __construct(array $conditions = [], int $conjunction = self:: AND)
+    public function __construct(array $conditions = [], Conjunction $conjunction = Conjunction::AND)
     {
         $this->group = $conditions;
         $this->conjunction = $conjunction;
diff --git a/test/tests/SQLTest.php b/test/tests/SQLTest.php
index 647b627..acb8de3 100644
--- a/test/tests/SQLTest.php
+++ b/test/tests/SQLTest.php
@@ -2,6 +2,7 @@
 
 namespace Aternos\Model\Test\Tests;
 
+use Aternos\Model\Query\Conjunction;
 use Aternos\Model\Query\DeleteQuery;
 use Aternos\Model\Query\Generator\SQL;
 use Aternos\Model\Query\Limit;
@@ -142,7 +143,7 @@ public function testSelectWhereGroupOR()
             new WhereGroup([
                 new WhereCondition('number', 1, '>'),
                 new WhereCondition('number', 0, '<'),
-            ], WhereGroup::OR),
+            ], Conjunction::OR),
         );
         $query->modelClassName = TestModel::class;
 
diff --git a/test/tests/TestDriverTest.php b/test/tests/TestDriverTest.php
index a09cd5c..827df2d 100644
--- a/test/tests/TestDriverTest.php
+++ b/test/tests/TestDriverTest.php
@@ -4,11 +4,12 @@
 
 use Aternos\Model\Driver\DriverRegistry;
 use Aternos\Model\Driver\Test\TestDriver;
+use Aternos\Model\Query\Conjunction;
 use Aternos\Model\Query\CountField;
 use Aternos\Model\Query\DeleteQuery;
+use Aternos\Model\Query\Direction;
 use Aternos\Model\Query\MaxField;
 use Aternos\Model\Query\MinField;
-use Aternos\Model\Query\OrderField;
 use Aternos\Model\Query\SelectField;
 use Aternos\Model\Query\SumField;
 use Aternos\Model\Query\WhereCondition;
@@ -144,7 +145,7 @@ public function testSelectWhereOr(): void
         $models = TestModel::select(new WhereGroup([
             new WhereCondition("number", 1),
             new WhereCondition("number", 2)
-        ], WhereGroup::OR));
+        ], Conjunction::OR));
         $this->assertCount(2, $models);
         $this->assertEquals("1B", $models[0]->id);
         $this->assertEquals("B", $models[0]->text);
@@ -337,7 +338,7 @@ public function testSelectLikeEscaping(): void
 
     public function testSelectOrder(): void
     {
-        $models = TestModel::select(order: ["number" => OrderField::DESCENDING]);
+        $models = TestModel::select(order: ["number" => Direction::DESCENDING]);
         $this->assertCount(10, $models);
         $this->assertEquals("9J", $models[0]->id);
         $this->assertEquals("J", $models[0]->text);