feat: Added doctrine/dbal v4.0. (#7)

* #6 Added doctrine/dbal v4.0.

* fix: Apply suggestions from code review

---------

Co-authored-by: Jon <[email protected]>

Author: tasselchof

composer.json

@@ -19,7 +19,7 @@
     "license": "Apache-2.0",
     "require": {
         "casbin/casbin": "^3.0",
-        "doctrine/dbal": "^2.9|^3.0"
+        "doctrine/dbal": "^2.9|^3.0|^4.0"
     },
     "require-dev": {
         "phpunit/phpunit": "~7.0|~8.0",

src/Adapter.php

@@ -97,7 +97,7 @@ public static function newAdapter($connection): Adapter
      */
     public function initTable()
     {
-        $sm = $this->connection->getSchemaManager();
+        $sm = method_exists($this->connection, "createSchemaManager") ? $sm = $this->connection->createSchemaManager() : $sm = $this->connection->getSchemaManager();
         if (!$sm->tablesExist([$this->policyTableName])) {
             $schema = new Schema();
             $table = $schema->createTable($this->policyTableName);
@@ -147,7 +147,8 @@ public function savePolicyLine($pType, array $rule)
     public function loadPolicy(Model $model): void
     {
         $queryBuilder = $this->connection->createQueryBuilder();
-        $stmt = $queryBuilder->select('p_type', 'v0', 'v1', 'v2', 'v3', 'v4', 'v5')->from($this->policyTableName)->execute();
+        $query = $queryBuilder->select('p_type', 'v0', 'v1', 'v2', 'v3', 'v4', 'v5')->from($this->policyTableName);
+        $stmt = method_exists($query, "executeQuery") ? $query->executeQuery() : $query->execute();
 
         while ($row = $this->fetch($stmt)) {
             $this->loadPolicyArray($this->filterRule($row), $model);