diff --git a/src/DB/Codeigniter4Adapter.php b/src/DB/Codeigniter4Adapter.php
index bcc8504..eb2fe22 100644
--- a/src/DB/Codeigniter4Adapter.php
+++ b/src/DB/Codeigniter4Adapter.php
@@ -86,7 +86,7 @@ public function makeQueryString(string $query, ColumnCollection $columns): strin
      * @param $query
      * @return string
      */
-    public function getQueryString($query)
+    public function getQueryString($query): string
     {
         if ($query instanceof \CodeIgniter\Database\BaseBuilder) {
             return $query->getCompiledSelect();
diff --git a/src/DB/DBAdapter.php b/src/DB/DBAdapter.php
index eeddeb6..0b7d05e 100644
--- a/src/DB/DBAdapter.php
+++ b/src/DB/DBAdapter.php
@@ -98,7 +98,7 @@ public function makeLimitString(int $take, int $skip)
      * @param $query
      * @return string
      */
-    public function getQueryString($query)
+    public function getQueryString($query): string
     {
         return $query;
     }
diff --git a/src/DB/DatabaseInterface.php b/src/DB/DatabaseInterface.php
index 6490ee9..183701a 100644
--- a/src/DB/DatabaseInterface.php
+++ b/src/DB/DatabaseInterface.php
@@ -74,4 +74,10 @@ public function makeOrderByString(array $o);
      * @return mixed
      */
     public function makeLimitString(int $take, int $skip);
+
+    /**
+     * @param $query
+     * @return string
+     */
+    public function getQueryString($query): string;
 }
diff --git a/src/DB/LaravelAdapter.php b/src/DB/LaravelAdapter.php
index c69e3f8..c2ca3a9 100644
--- a/src/DB/LaravelAdapter.php
+++ b/src/DB/LaravelAdapter.php
@@ -71,7 +71,7 @@ public function escape($string, Query $query)
      * @param $query
      * @return string
      */
-    public function getQueryString($query)
+    public function getQueryString($query): string
     {
         if ($query instanceof \Illuminate\Database\Eloquent\Builder) {
             return vsprintf(str_replace('?', '%s', $query->toSql()),
diff --git a/src/Datatables.php b/src/Datatables.php
index e9d70e2..9c309c9 100644
--- a/src/Datatables.php
+++ b/src/Datatables.php
@@ -180,7 +180,7 @@ public function hide(string $column, $searchable = false): Datatables
     }
 
     /**
-     * @param string $query
+     * @param mixed $query
      * @return Datatables
      */
     public function query($query): Datatables