MongoDB 查询结果保存入新表

1.利用游标方式

var lst = 查询语句
while(lst.hasNext()) db.新表名.insert(lst.next());

var lst = db.getCollection("article_xjhw").aggregate({
    $lookup: {
        from: "issue_xjhw",
        localField: "request_url",
        foreignField: "url",
        as:"title"
     }
})
while(lst.hasNext()) db.t2.insert(lst.next());

2.aggregate $out管道操作符

$out参数是新表名

 db.getCollection("article_xjhw").aggregate([{
    $lookup: {
        from: "issue_xjhw",
        localField: "request_url",
        foreignField: "url",
        as:"title"
     }
},{
  $out: 'results'
}])