diff --git a/gmars_rbac.sql b/gmars_rbac.sql
index 67858d5..f4647ac 100644
--- a/gmars_rbac.sql
+++ b/gmars_rbac.sql
@@ -26,13 +26,9 @@ DROP TABLE IF EXISTS `###role`;
 CREATE TABLE `###role` (
   `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
   `name` varchar(50) NOT NULL DEFAULT '' COMMENT '角色名',
-  `parent_id` int(11) unsigned NOT NULL DEFAULT '0' COMMENT '父级id（一般不建议角色的继承）',
   `description` varchar(200) NOT NULL DEFAULT '' COMMENT '角色描述',
   `status` smallint(4) unsigned NOT NULL DEFAULT '0' COMMENT '状态1正常0未启用',
   `sort_num` int(11) unsigned NOT NULL DEFAULT '0' COMMENT '排序值',
-  `left_key` int(11) unsigned NOT NULL DEFAULT '0' COMMENT '左值',
-  `right_key` int(11) unsigned NOT NULL DEFAULT '0' COMMENT '右值',
-  `level` int(11) unsigned NOT NULL DEFAULT '0' COMMENT '层级',
   PRIMARY KEY (`id`),
   KEY `idx_role` (`status`,`left_key`,`right_key`,`level`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='角色';
diff --git a/src/Rbac.php b/src/Rbac.php
index 6b52c9f..a32173d 100755
--- a/src/Rbac.php
+++ b/src/Rbac.php
@@ -66,12 +66,12 @@ public function __construct()
 
     /**
      * 生成所需的数据表
-     * @param string $prefix
+     * @param string $db
      */
-    public function createTable($prefix = '')
+    public function createTable($db = '')
     {
         $createTable = new CreateTable();
-        $createTable->create($prefix);
+        $createTable->create($db);
     }
 
     /**
@@ -164,12 +164,7 @@ public function delPermissionBatch($condition)
     public function getPermission($condition)
     {
         $model = new Permission($this->db);
-        if (is_numeric($condition)) {
-            return $model->where('id', $condition)->find();
-        }
-
-        return $model->where($condition)->select();
-
+        return $model->getPermission($condition);
     }
 
     /**
@@ -207,6 +202,20 @@ public function delPermissionCategory($id = 0)
         }
     }
 
+    /**
+     * 获取权限分组
+     * @param $where
+     * @return array|\PDOStatement|string|\think\Collection|\think\Model|null
+     * @throws \think\db\exception\DataNotFoundException
+     * @throws \think\db\exception\ModelNotFoundException
+     * @throws \think\exception\DbException
+     */
+    public function getPermissionCategory($where)
+    {
+        $model = new PermissionCategory($this->db);
+        return $model->getCategory($where);
+    }
+
     /**
      * 编辑角色
      * @param array $data
@@ -230,18 +239,16 @@ public function createRole(array $data = [], $permissionIds = '')
     /**
      * 根据id或标准条件获取角色
      * @param $condition
+     * @param bool $withPermissionId
      * @return array|\PDOStatement|string|\think\Collection|\think\Model|null
      * @throws \think\db\exception\DataNotFoundException
      * @throws \think\db\exception\ModelNotFoundException
      * @throws \think\exception\DbException
      */
-    public function getRole($condition)
+    public function getRole($condition, $withPermissionId = true)
     {
         $model = new Role($this->db);
-        if (is_numeric($condition)) {
-            return $model->where('id', $condition)->find();
-        }
-        return $model->where($condition)->select();
+        return $model->getRole($condition, $withPermissionId);
     }
 
     /**
@@ -336,7 +343,6 @@ public function cachePermission($id, $timeOut = 3600)
         if (empty($id)) {
             throw new Exception('参数错误');
         }
-
         $model = new Permission($this->db);
         $permission = $model->userPermission($id, $timeOut);
         return $permission;
diff --git a/src/model/Permission.php b/src/model/Permission.php
index 936bad4..00b63a9 100644
--- a/src/model/Permission.php
+++ b/src/model/Permission.php
@@ -10,6 +10,7 @@
 
 
 
+use think\Db;
 use think\Exception;
 use think\facade\Cache;
 use think\facade\Session;
@@ -109,7 +110,7 @@ public function userPermission($userId, $timeOut = 3600)
         }
         Cache::set($this->_permissionCachePrefix . $userId, $newPermission, $timeOut);
         Session::set('gmars_rbac_permission_name', $this->_permissionCachePrefix . $userId);
-        return $permission;
+        return $newPermission;
     }
 
     /**
@@ -122,10 +123,29 @@ public function userPermission($userId, $timeOut = 3600)
      */
     public function getPermissionByUserId($userId)
     {
-        $permission = $this->alias('p')
-            ->join(['role_permission' => 'rp'], 'p.id = rp.permission_id')
-            ->join(['user_role' => 'ur'], 'rp.role_id = ur.role_id')
+        $prefix = $this->getConfig('prefix');
+        $permission = Db::name('permission')->setConnection($this->getConnection())->alias('p')
+            ->join(["{$prefix}role_permission" => 'rp'], 'p.id = rp.permission_id')
+            ->join(["{$prefix}user_role" => 'ur'], 'rp.role_id = ur.role_id')
             ->where('ur.user_id', $userId)->select();
         return $permission;
     }
+
+    /**
+     * 获取权限节点
+     * @param $condition
+     * @return array|\PDOStatement|string|\think\Collection|\think\Model|null
+     * @throws \think\db\exception\DataNotFoundException
+     * @throws \think\db\exception\ModelNotFoundException
+     * @throws \think\exception\DbException
+     */
+    public function getPermission($condition)
+    {
+        $model = Db::name('permission')->setConnection($this->getConnection());
+        if (is_numeric($condition)) {
+           return $model->where('id', $condition)->find();
+        } else {
+            return $model->where($condition)->select();
+        }
+    }
 }
\ No newline at end of file
diff --git a/src/model/PermissionCategory.php b/src/model/PermissionCategory.php
index b3aa6ab..92c8b88 100644
--- a/src/model/PermissionCategory.php
+++ b/src/model/PermissionCategory.php
@@ -9,6 +9,7 @@
 namespace gmars\rbac\model;
 
 
+use think\Db;
 use think\Exception;
 
 class PermissionCategory extends Base
@@ -63,4 +64,22 @@ public function delCategory($id)
         return true;
     }
 
+    /**
+     * 获取权限分组
+     * @param $where
+     * @return array|\PDOStatement|string|\think\Collection|\think\Model|null
+     * @throws \think\db\exception\DataNotFoundException
+     * @throws \think\db\exception\ModelNotFoundException
+     * @throws \think\exception\DbException
+     */
+    public function getCategory($where)
+    {
+        $model = Db::name('permission_category')->setConnection($this->getConnection());
+        if (is_numeric($where)) {
+            return $model->where('id', $where)->find();
+        } else {
+            return $model->where($where)->select();
+        }
+    }
+
 }
\ No newline at end of file
diff --git a/src/model/Role.php b/src/model/Role.php
index 74988d8..b98b3ad 100644
--- a/src/model/Role.php
+++ b/src/model/Role.php
@@ -9,6 +9,7 @@
 namespace gmars\rbac\model;
 
 
+use think\Db;
 use think\Exception;
 
 class Role extends Base
@@ -103,4 +104,51 @@ public function delRole($condition)
         return true;
     }
 
+    /**
+     * 获取角色列表
+     * @param $condition
+     * @param bool $withPermissionId
+     * @return array|\PDOStatement|string|\think\Collection|\think\Model|null
+     * @throws \think\db\exception\DataNotFoundException
+     * @throws \think\db\exception\ModelNotFoundException
+     * @throws \think\exception\DbException
+     */
+    public function getRole($condition, $withPermissionId = false)
+    {
+        $model = Db::name('role')->setConnection($this->getConnection());
+        $where = [];
+        if (is_array($condition)) {
+            $where = $condition;
+        } else {
+            $condition = (int)$condition;
+            if (is_numeric($condition) && $condition > 0) {
+                $role = $model->where('id', $condition)->find();
+                if (!empty($role) && $withPermissionId) {
+                    $role['permission_ids'] = Db::name('role_permission')->setConnection($this->getConnection())
+                        ->where('role_id', $condition)->column('permission_id');
+                }
+                return $role;
+            }
+        }
+        $role = Db::name('role')->setConnection($this->getConnection())
+            ->where($where)->select();
+        if (!empty($role) && $withPermissionId) {
+            $permission = Db::name('role_permission')->setConnection($this->getConnection())
+                ->where('role_id', 'IN', array_column($role, 'id'))->select();
+            $roleIdIndexer = [];
+            if (!empty($permission)) {
+                foreach ($permission as $v)
+                {
+                    $roleIdIndexer[$v['role_id']][] = $v['permission_id'];
+                }
+            }
+            foreach ($role as &$v)
+            {
+                $v['permission_ids'] = isset($roleIdIndexer[$v['id']])? $roleIdIndexer[$v['id']] : [];
+                unset($v);
+            }
+        }
+        return $role;
+    }
+
 }
\ No newline at end of file