解决无参数时报500问题

Modules/OpcData/Http/Controllers/Api/OpcDataController.php

@@ -54,16 +54,17 @@ class OpcDataController extends Controller
     
     public function getData(Request $request)
     {
-        $getDataType = $request->system_type;   // 获取需要的数据
-        $getMineCode = $request->mine_code;     // 矿分类
+        $getDataType = isset($request->system_type);   // 获取需要的数据
+        $getMineCode = isset($request->mine_code);     // 矿分类
         $dataArr = array();                     // 返回数据数组
 
-        $opcConnectName   = 'mysql_opc_'.$getMineCode;
-
-        $opcDB =  DB::connection($opcConnectName);
         
         if (isset($this->localConf[$getMineCode][$getDataType])) {
+
+            $opcConnectName   = 'mysql_opc_'.$getMineCode;
+            
             $groupId = $this->localConf[$getMineCode][$getDataType];
+
             $sqlStr = "
             select t1.dev_type_id,
                     t1.dev_type_name,
@@ -84,6 +85,8 @@ class OpcDataController extends Controller
             and t1.is_show = 1
             order by t1.dev_type_id, t1.row_number, t1.device_num, t1.device_name
             ";
+            
+            $opcDB =  DB::connection($opcConnectName);
             $dbResult = $opcDB->select($sqlStr);
             // echo($sqlStr);
             switch($getDataType) {