我使用的是thinkphp6,mongodb4.0实际业务查询

  $list = Db::connect('tstd_mongo')->table("$table_time.Item")->where($where)->order("Cause","asc")->field('_id,DBID,Data,GSID,MainKind,ManID,DISTINCT(Serial) Serial,SubKind,Time')->paginate($limit);

->table("$table_time.Item")

我是根据数据，要去不同的数据库查询，需要修改源码

topthink\think-orm\src\db\connector\Mogo.php      function command()下 ，

$dbName = $dbName ?: $this->dbName; 

修改成

if (!empty($this->builder->dbName)){$dbName = $dbName ?: $this->builder->dbName;$this->dbName=$dbName;
}else{$dbName = $dbName ?: $this->dbName;
}

如果使用paginate  count  就要修改

topthink\think-orm\src\db\builder\Mongo.php

if (strstr($options['table'], '.')!== false) {$parts = explode('.',$options['table']);$count_db = !empty($parts[0])?$parts[0]:'';$count_table = !empty($parts[1])?$parts[1]:'';if (!empty($count_table)){$options['table']=$count_table;}if (!empty($count_db)){$this->dbName = $count_db;}
}

如果用  其他 ，aggregate，select  方法  也要加这段代码