func ConnecToDB() *mgo.Collection {
 session, err := mgo.Dial("127.0.0.1:27017")
 if err != nil {
 panic(err)
 }
 //defer session.Close()
 session.SetMode(mgo.Monotonic, true)
 c := session.DB("medex").C("student")
 return c
}

func InsertToMogo() {
 c := ConnecToDB()
 stu1 := Student{
 Name: "xiaoming",
 Phone: "18933333333",
 Email: "12345678@qq.com",
 Sex: "man",
 }
 stu2 := Student{
 Name: "zhangdao",
 Phone: "8765432",
 Email: "133333384@qq.com",
 Sex: "woman",
 }
 err := c.Insert(&stu1, &stu2)
 if err != nil {
 log.Fatal(err)
 }
}

func GetDataViaSex() {
 c := ConnecToDB()
 result := Student{}
 err := c.Find(bson.M{"sex": "woman"}).One(&result)
 if err != nil {
 log.Fatal(err)
 }
 fmt.Println("student", result)
 students := make([]Student, 20)
 err = c.Find(nil).All(&students)
 if err != nil {
 log.Fatal(err)
 }
 fmt.Println(students)

}
func GetDataViaId() {
 id := bson.ObjectIdHex("5a66a96306d2a40a8b884049")
 c := ConnecToDB()
 stu := &Student{}
 err := c.FindId(id).One(stu)
 if err != nil {
 log.Fatal(err)
 }
 fmt.Println(stu)
}

func UpdateDBViaId() {
 //id := bson.ObjectIdHex("5a66a96306d2a40a8b884049")
 c := ConnecToDB()
 err := c.Update(bson.M{"email": "12832984@qq.com"}, bson.M{"$set": bson.M{"name": "haha", "phone": "37848"}})
 if err != nil {
 log.Fatal(err)
 }
}

func RemoveFromMgo() {
 c := ConnecToDB()
 _, err := c.RemoveAll(bson.M{"phone": "13480989765"})
 if err != nil {
 log.Fatal(err)
 }
}