我有以下2个mongodb文件:
{
"id" : "me@something.com",
"Sales Data" : {
"Company" : "Some Company",
"PhoneNumber" : "301-555-1212",
"City" : "Baltimore",
"State" : "MD",
"Orders" : {
"0" : {
"ProductId" : "ABC",
"Quantity" : "3"
},
"1" : {
"ProductId" : "DEF",
"Quantity" : "2"
}
}
}
}
{
"id": "you@company.com",
"Sales Data" : {
"Company" : "Your Company",
"PhoneNumber" : "",
"City" : "",
"State" : ""
}
}
我试图找出如何编写mongodb update
语句,该语句将使用第一个文档中的“Sales Data”字段数据更新第二个文档的“Sales Data”字段。即使我必须手动构造更好的更新语句。我只是无法弄清楚语法。我试过这样的东西,但它不起作用
db.getCollection('MyCollection').update({id: "you@company.com"}, {$set: {"Sales Data": "???"});
答案 0 :(得分:0)
在@chridam的帮助下,我能够弄明白。我刚刚使用了mongo shell并编写了一个小脚本来完成这个技巧。它看起来像这样:
db1 = connect("instance1Url/myDb1","myUserName","myPassword");
coll1 = db1.getCollection("myCollection");
salesData = coll1.findOne({id:"me@something.com"})["Sales Data"];
db2 = connect("instance2Url/myDB2", "myUserName", "myPassword");
coll2 = db2.getCollection("myCollection");
coll2.updateOne({id:"you@company.com"}, {$set: {"Sales Data": salesData}});