【适用对象】 | Myslq | Mongodb | Elasticsearch | --- | --- | --- | | √ | √ | √ | 【使用说明】 返回查询总条数 【代码示例】 mysql ``` $count=Db::name("xyx_user")->filed("id,nickname") ->where(["id"=>2])->count(); ``` mongodb ``` $count=Db::mongo("xyx_user")->filed("id,nickname") ->where(["id"=>2])->count(); ``` Elasticsearch ``` $count=Db::elasticsearch("xyx_user")->where(["id"=>2])->count(); ```