如何在golang和mongodb中用id查找 [英] How to find by id in golang and mongodb
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问题描述
我需要使用ObjectIdHex获取值并进行更新并查看结果。我正在使用mongodb和golang.But下面的代码不能按预期工作
包主
进口(
fmt
gopkg.in/mgo.v2
gopkg.in/mgo.v2/bson
)
类型Person结构{
Id bson.ObjectId`json:idbson:_ id,omitempty`
名称字符串
电话字符串
}
func checkError(err error){
if err!= nil {
panic(err)
}
}
const(
DB_NAME =gotest
DB_COLLECTION =pepole_new1
)
func main(){
session,err:= mgo.Dial(localhost)
checkError(err)
defer session.Close()
$ b $ session.SetMode(mgo.Monotonic,true)
c:= session.DB DB_NAME).C(DB_COLLECTION)
err = c.DropCollection()
checkError(err)
$ b ale:= Person {Name:Ale,Phone:555- 5555}
cla:= Person {姓名:Cla,电话:555-1234-2222}
kasaun := Person {姓名:kasaun,电话:533-12554-2222}
chamila:= Person {姓名:chamila,电话:533-545-6784}
fmt.Println(插入)
err = c.Insert(& ale,& cla,& kasaun,& chamila)
checkError(err)
fmt.Println(findbyID)
var resultsID [] Person
// err = c.FindId(bson.ObjectIdHex(56bdd27ecfa93bfe3d35047d))。One(& resultsID)
err = c.FindId(bson.M {Id:bson.ObjectIdHex(56bdd27ecfa93bfe3d35047d)})。(& resultsID)
checkError(err)
if err!= nil {
panic(err)
}
fmt.Println(Phone:,resultsID)
fmt.Println( Queryingall)
var results [] Person
err = c.Find(nil).All(& results)
if err!= nil {
panic (err)
}
fmt.Println(Results All:,results)
}
FindId(bson.M {Id:bson.ObjectIdHex(56bdd27ecfa93bfe (& resultID)
对我来说不起作用,并给我下面的输出
插入
查询所有
结果全部:[{ObjectIdHex(56bddee2cfa93bfe3d3504a1)Ale 555-5555} {ObjectIdHex(56bddee2cfa93bfe3d3504a2)Cla 555-1234-2222} {ObjectIdHex(56bddee2cfa93bfe3d3504a3 )kasaun 533-12554-2222} {ObjectIdHex(56bddee2cfa93bfe3d3504a4)chamila 533-545-6784}]
findbyID
panic:找不到
goroutine 1 [running]:
main.checkError(0x7f33d524b000,0xc8200689b0)
我该如何解决这个问题?我需要使用oid来获得价值,并且做更新,我该如何做到这一点
它应该是 _id not
Id
:
c.FindId (bson.M {_ id:bson.ObjectIdHex(56bddecfa93bfe3d35047d)})
I need get values using ObjectIdHex and do update and also view the result. I'm using mongodb and golang.But following code doesn't work as expected
package main
import (
"fmt"
"gopkg.in/mgo.v2"
"gopkg.in/mgo.v2/bson"
)
type Person struct {
Id bson.ObjectId `json:"id" bson:"_id,omitempty"`
Name string
Phone string
}
func checkError(err error) {
if err != nil {
panic(err)
}
}
const (
DB_NAME = "gotest"
DB_COLLECTION = "pepole_new1"
)
func main() {
session, err := mgo.Dial("localhost")
checkError(err)
defer session.Close()
session.SetMode(mgo.Monotonic, true)
c := session.DB(DB_NAME).C(DB_COLLECTION)
err = c.DropCollection()
checkError(err)
ale := Person{Name:"Ale", Phone:"555-5555"}
cla := Person{Name:"Cla", Phone:"555-1234-2222"}
kasaun := Person{Name:"kasaun", Phone:"533-12554-2222"}
chamila := Person{Name:"chamila", Phone:"533-545-6784"}
fmt.Println("Inserting")
err = c.Insert(&ale, &cla, &kasaun, &chamila)
checkError(err)
fmt.Println("findbyID")
var resultsID []Person
//err = c.FindId(bson.ObjectIdHex("56bdd27ecfa93bfe3d35047d")).One(&resultsID)
err = c.FindId(bson.M{"Id": bson.ObjectIdHex("56bdd27ecfa93bfe3d35047d")}).One(&resultsID)
checkError(err)
if err != nil {
panic(err)
}
fmt.Println("Phone:", resultsID)
fmt.Println("Queryingall")
var results []Person
err = c.Find(nil).All(&results)
if err != nil {
panic(err)
}
fmt.Println("Results All: ", results)
}
FindId(bson.M{"Id": bson.ObjectIdHex("56bdd27ecfa93bfe3d35047d")}).One(&resultsID)
didn't work for me and giving me following output
Inserting
Queryingall
Results All: [{ObjectIdHex("56bddee2cfa93bfe3d3504a1") Ale 555-5555} {ObjectIdHex("56bddee2cfa93bfe3d3504a2") Cla 555-1234-2222} {ObjectIdHex("56bddee2cfa93bfe3d3504a3") kasaun 533-12554-2222} {ObjectIdHex("56bddee2cfa93bfe3d3504a4") chamila 533-545-6784}]
findbyID
panic: not found
goroutine 1 [running]:
main.checkError(0x7f33d524b000, 0xc8200689b0)
How can i fix this problem? i need get value using oid and do update also how can i do that
解决方案
It should be _id
not Id
:
c.FindId(bson.M{"_id": bson.ObjectIdHex("56bdd27ecfa93bfe3d35047d")})
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