mongodb BSON的基本使用教程

m := bson.M{    "create_time": bson.M{      "$gte": start,      "$lte": end,    },    "account": account,    "tag": "tag",  }  session.DB("db").C("collect").Find(m).Count()

  //这个就可以传入Pipe  m := []bson.M{    {"$match": bson.M{"tag": "tag", "account": account, "create_time": bson.M{"$gte": start, "$lte": end}}},    {"$group": bson.M{"_id": "$TagName", "count": bson.M{"$sum": 1}}},    {"$sort": bson.M{"count": -1}},    {"$limit": 3},  }  //这里就可以取到输出的数据  var values []result  session.DB("db").C("collect").Pipe(m).All(&values)

package mainimport ( "gopkg.in/mgo.v2" "log" "gopkg.in/mgo.v2/bson")type User struct { Id    bson.ObjectId `bson:"_id"` Name   string    `bson:"name"` PassWord string    `bson:"pass_word"` Age   int      `bson:"age"`}func main() { db, err := mgo.Dial("mongodb://192.168.2.28:27017,192.168.2.28:27018,192.168.2.28:27019/?replicaSet=howie") if err != nil { log.Fatalln(err) } defer db.Close() db.SetMode(mgo.Monotonic, true) c := db.DB("howie").C("person") //插入 /*c.Insert(&User{ Id:    bson.NewObjectId(), Name:   "JK_CHENG", PassWord: "123132", Age: 2, }, &User{ Id:    bson.NewObjectId(), Name:   "JK_WEI", PassWord: "qwer", Age: 5, }, &User{ Id:    bson.NewObjectId(), Name:   "JK_HE", PassWord: "6666", Age: 7, })*/ var users []User c.Find(nil).All(&users) //查询全部数据 log.Println(users) c.FindId(users[0].Id).All(&users) //通过ID查询 log.Println(users) c.Find(bson.M{"name": "JK_WEI"}).All(&users) //单条件查询(=) log.Println(users) c.Find(bson.M{"name": bson.M{"$ne": "JK_WEI"}}).All(&users) //单条件查询(!=) log.Println(users) c.Find(bson.M{"age": bson.M{"$gt": 5}}).All(&users) //单条件查询(>) log.Println(users) c.Find(bson.M{"age": bson.M{"$gte": 5}}).All(&users) //单条件查询(>=) log.Println(users) c.Find(bson.M{"age": bson.M{"$lt": 5}}).All(&users) //单条件查询(<) log.Println(users) c.Find(bson.M{"age": bson.M{"$lte": 5}}).All(&users) //单条件查询(<=) log.Println(users) /*c.Find(bson.M{"name": bson.M{"$in": []string{"JK_WEI", "JK_HE"}}}).All(&users) //单条件查询(in) log.Println(users) c.Find(bson.M{"$or": []bson.M{bson.M{"name": "JK_WEI"}, bson.M{"age": 7}}}).All(&users) //多条件查询(or) log.Println(users) c.Update(bson.M{"_id": users[0].Id}, bson.M{"$set": bson.M{"name": "JK_HOWIE", "age": 61}}) //修改字段的值($set) c.FindId(users[0].Id).All(&users) log.Println(users) c.Find(bson.M{"name": "JK_CHENG", "age": 66}).All(&users) //多条件查询(and) log.Println(users) c.Update(bson.M{"_id": users[0].Id}, bson.M{"$inc": bson.M{"age": -6,}}) //字段增加值($inc) c.FindId(users[0].Id).All(&users) log.Println(users)*/ //c.Update(bson.M{"_id": users[0].Id}, bson.M{"$push": bson.M{"interests": "PHP"}}) //从数组中增加一个元素($push) c.Update(bson.M{"_id": users[0].Id}, bson.M{"$pull": bson.M{"interests": "PHP"}}) //从数组中删除一个元素($pull) c.FindId(users[0].Id).All(&users) log.Println(users) c.Remove(bson.M{"name": "JK_CHENG"})//删除}