Merge pull request #72 from teamones-open/2.0

modify： selectData 接口优化，移除count上限数据限制

Author: weijer

src/think/model/RelationModel.php

@@ -2833,19 +2833,12 @@ public function selectData($options = [], $needFormat = true)
             if (array_key_exists("page", $options) && (int)$options["page"][0] > 1) {
                 $isNotFirstPageOrNotCount = true;
             } else {
-                $maxId = $this->max('id');
-
                 if ($this->isComplexFilter) {
                     $this->alias("`{$this->currentModuleCode}`");
                 }
 
-                if ($maxId > 100000) {
-                    // 当单表数据量超过10万时候，不做count查询
-                    $total = C("database.database_max_select_rows");
-                } else {
-                    //  只有第一页才count total
-                    $total = $this->where($filter)->count();
-                }
+                //  只有第一页才count total
+                $total = $this->where($filter)->cache(60)->count();
             }
         } else {
             // 不需要count数据