遇到_id相同的情况下:
insert操作会报错;save完成保存操作

> db.person.find()
> db.person.insert({"_id":1,age:1,name:"hh"})
WriteResult({ "nInserted" : 1 })
> db.person.find()
{ "_id" : 1, "age" : 1, "name" : "hh" } #insert一个"_id"已经存在的文档
> db.person.insert({"_id":1,age:10,name:"hh02"})
WriteResult({
"nInserted" : 0,
"writeError" : {
"code" : 11000,
"errmsg" : "E11000 duplicate key error collection: foobar.person index: _id_ dup key: { : 1.0 }"
}
})
> db.person.find()
{ "_id" : 1, "age" : 1, "name" : "hh" } #save一个"_id"已经存在的文档
> db.person.save({"_id":1,age:10,name:"hh02"})
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
> db.person.find()
{ "_id" : 1, "age" : 10, "name" : "hh02" }
>
05-11 18:09
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