mongodb - save()和insert()的区别

遇到_id相同的情况下：
insert操作会报错；save完成保存操作

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> 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" } >