Model增加setCache方法用于设置缓存

src/Model.php

@@ -588,6 +588,21 @@ public function dec(string $field, float $step = 1, int $lazyTime = 0)
         return $this->set($field, new Express('-', $step, $lazyTime));
     }
 
+    /**
+     * 查询缓存 数据为空不缓存.
+     *
+     * @param mixed         $key    缓存key
+     * @param int|\DateTime $expire 缓存有效期
+     * @param string|array  $tag    缓存标签
+     *
+     * @return $this
+     */
+    public function setCache($key = true, $expire = null, $tag = null)
+    {
+        $this->db()->cache($key, $expire, $tag);
+        return $this;
+    }
+
     /**
      * 获取属性 支持获取器
      *