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Qmgo - The Go driver for MongoDB. It‘s based on official mongo-go-driver but easier to use like Mgo.

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Qmgo

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Qmgo is a Go driver for MongoDB . It is based on MongoDB official driver, but easier to use like mgo (such as the chain call).

  • Qmgo allows users to use the new features of MongoDB in a more elegant way.

  • Qmgo is the first choice for migrating from mgo to the new MongoDB driver with minimal code changes.

Requirements

-Go 1.10 and above.

-MongoDB 2.6 and above.

Features

  • CRUD to documents, with all official supported options
  • Sort、limit、count、select、distinct
  • Transactions
  • Hooks
  • Automatically default and custom fields
  • Predefine operator keys
  • Aggregate、indexes operation、cursor
  • Validation tags
  • Plugin

Installation

  • Use go mod to automatically install dependencies by import github.com/qiniu/qmgo

Or

  • Use go get github.com/qiniu/qmgo

Usage

  • Start

    import and create a new connection

    import (
        "context"
      
        "github.com/qiniu/qmgo"
    )
    
    ctx := context.Background()
    client, err := qmgo.NewClient(ctx, &qmgo.Config{Uri: "mongodb://localhost:27017"})
    db := client.Database("class")
    coll := db.Collection("user")

    If your connection points to a fixed database and collection, recommend using the following way to initialize the connection. All operations can be based on cli:

    cli, err := qmgo.Open(ctx, &qmgo.Config{Uri: "mongodb://localhost:27017", Database: "class", Coll: "user"})

    The following examples will be based on cli, if you use the first way for initialization, replace cli with clientdb or coll

    Make sure to defer a call to Disconnect after instantiating your client:

    defer func() {
    if err = cli.Close(ctx); err != nil {
            panic(err)
        }
    }()
  • Create index

    Before doing the operation, we first initialize some data:

    type UserInfo struct {
        Name   string `bson:"name"`
        Age    uint16 `bson:"age"`
        Weight uint32 `bson:"weight"`
    }
    
    var userInfo = UserInfo{
        Name: "xm",
        Age: 7,
        Weight: 40,
    }

    Create index

    cli.CreateOneIndex(context.Background(), options.IndexModel{Key: []string{"name"}})
    cli.CreateIndexes(context.Background(), []options.IndexModel{{Key: []string{"id2", "id3"}}})
  • Insert a document

    // insert one document
    result, err := cli.InsertOne(ctx, userInfo)
  • Find a document

    // find one document
      one := UserInfo{}
      err = cli.Find(ctx, bson.M{"name": userInfo.Name}).One(&one)
  • Delete documents

    err = cli.Remove(ctx, bson.M{"age": 7})
  • Insert multiple data

    // multiple insert
    var userInfos = []UserInfo{
        UserInfo{Name: "a1", Age: 6, Weight: 20},
        UserInfo{Name: "b2", Age: 6, Weight: 25},
        UserInfo{Name: "c3", Age: 6, Weight: 30},
        UserInfo{Name: "d4", Age: 6, Weight: 35},
        UserInfo{Name: "a1", Age: 7, Weight: 40},
        UserInfo{Name: "a1", Age: 8, Weight: 45},
    }
    result, err = cli.Collection.InsertMany(ctx, userInfos)
  • Search all, sort and limit

    // find all, sort and limit
    batch := []UserInfo{}
    cli.Find(ctx, bson.M{"age": 6}).Sort("weight").Limit(7).All(&batch)
  • Count

    count, err := cli.Find(ctx, bson.M{"age": 6}).Count()
  • Update

    // UpdateOne one
    err := cli.UpdateOne(ctx, bson.M{"name": "d4"}, bson.M{"$set": bson.M{"age": 7}})
    
    // UpdateAll
    result, err := cli.UpdateAll(ctx, bson.M{"age": 6}, bson.M{"$set": bson.M{"age": 10}})
  • Select

    err := cli.Find(ctx, bson.M{"age": 10}).Select(bson.M{"age": 1}).One(&one)
  • Aggregate

    matchStage := bson.D{{"$match", []bson.E{{"weight", bson.D{{"$gt", 30}}}}}}
    groupStage := bson.D{{"$group", bson.D{{"_id", "$name"}, {"total", bson.D{{"$sum", "$age"}}}}}}
    var showsWithInfo []bson.M
    err = cli.Aggregate(context.Background(), Pipeline{matchStage, groupStage}).All(&showsWithInfo)
  • Support All mongoDB Options when create connection

    poolMonitor := &event.PoolMonitor{
        Event: func(evt *event.PoolEvent) {
            switch evt.Type {
            case event.GetSucceeded:
                fmt.Println("GetSucceeded")
            case event.ConnectionReturned:
                fmt.Println("ConnectionReturned")
            }
        },
    }
    opt := options.Client().SetPoolMonitor(poolMonitor)  // more options use the chain options.
    cli, err := Open(ctx, &Config{Uri: URI, Database: DATABASE, Coll: COLL}, opt) 
    
  • Transactions

    The super simple and powerful transaction, with features like timeoutretry:

    callback := func(sessCtx context.Context) (interface{}, error) {
        // Important: make sure the sessCtx used in every operation in the whole transaction
        if _, err := cli.InsertOne(sessCtx, bson.D{{"abc", int32(1)}}); err != nil {
            return nil, err
        }
        if _, err := cli.InsertOne(sessCtx, bson.D{{"xyz", int32(999)}}); err != nil {
            return nil, err
        }
        return nil, nil
    }
    result, err = cli.DoTransaction(ctx, callback)

    More about transaction

  • Predefine operator keys

    // aggregate
    matchStage := bson.D{{operator.Match, []bson.E{{"weight", bson.D{{operator.Gt, 30}}}}}}
    groupStage := bson.D{{operator.Group, bson.D{{"_id", "$name"}, {"total", bson.D{{operator.Sum, "$age"}}}}}}
    var showsWithInfo []bson.M
    err = cli.Aggregate(context.Background(), Pipeline{matchStage, groupStage}).All(&showsWithInfo)
  • Hooks

    Qmgo flexible hooks:

    type User struct {
        Name         string    `bson:"name"`
        Age          int       `bson:"age"`
    }
    func (u *User) BeforeInsert(ctx context.Context) error {
        fmt.Println("before insert called")
        return nil
    }
    func (u *User) AfterInsert(ctx context.Context) error {
        fmt.Println("after insert called")
        return nil
    }
    
    u := &User{Name: "Alice", Age: 7}
    _, err := cli.InsertOne(context.Background(), u)

    More about hooks

  • Automatically fields

    Qmgo support two ways to make specific fields automatically update in specific API

    • Default fields

    Inject field.DefaultField in document struct, Qmgo will update createAtupdateAt and _id in update and insert operation.

    type User struct {
      field.DefaultField `bson:",inline"`
    
      Name string `bson:"name"`
      Age  int    `bson:"age"`
    }
    
    u := &User{Name: "Lucas", Age: 7}
    _, err := cli.InsertOne(context.Background(), u)
    // Fields with tag createAt、updateAt and _id will be generated automatically 
    • Custom fields

    Define the custom fields, Qmgo will update them in update and insert operation.

    type User struct {
        Name string `bson:"name"`
        Age  int    `bson:"age"`
    
        MyId         string    `bson:"myId"`
        CreateTimeAt time.Time `bson:"createTimeAt"`
        UpdateTimeAt int64     `bson:"updateTimeAt"`
    }
    // Define the custom fields
    func (u *User) CustomFields() field.CustomFieldsBuilder {
        return field.NewCustom().SetCreateAt("CreateTimeAt").SetUpdateAt("UpdateTimeAt").SetId("MyId")
    }
    
    u := &User{Name: "Lucas", Age: 7}
    _, err := cli.InsertOne(context.Background(), u)
    // CreateTimeAt、UpdateTimeAt and MyId will be generated automatically 
    
    // suppose Id and ui is ready
    err = cli.ReplaceOne(context.Background(), bson.M{"_id": Id}, &ui)
    // UpdateTimeAt will update

    Check examples here

    More about automatically fields

  • Validation tags

    Qmgo Validation tags is Based on go-playground/validator.

    So Qmgo support all validations on structs in go-playground/validator, such as:

    type User struct {
        FirstName string            `bson:"fname"`
        LastName  string            `bson:"lname"`
        Age       uint8             `bson:"age" validate:"gte=0,lte=130" `    // Age must in [0,130]
        Email     string            `bson:"e-mail" validate:"required,email"` //  Email can't be empty string, and must has email format
        CreateAt  time.Time         `bson:"createAt" validate:"lte"`          // CreateAt must lte than current time
        Relations map[string]string `bson:"relations" validate:"max=2"`       // Relations can't has more than 2 elements
    }

    Qmgo tags only supported in following API: InsertOne、InsertyMany、Upsert、UpsertId、ReplaceOne

  • Plugin

    • Implement following method:
    func Do(ctx context.Context, doc interface{}, opType operator.OpType, opts ...interface{}) error{
      // do anything
    }
    • Call Register() in package middleware, register the method Do

      Qmgo will call Do before and after the operation

    middleware.Register(Do)

    Example

    The hookautomatically fields and validation tags in Qmgo run on plugin.

Qmgo vs go.mongodb.org/mongo-driver

Below we give an example of multi-file search、sort and limit to illustrate the similarities between qmgo and mgo and the improvement compare to go.mongodb.org/mongo-driver. How do we do ingo.mongodb.org/mongo-driver:

// go.mongodb.org/mongo-driver
// find all, sort and limit
findOptions := options.Find()
findOptions.SetLimit(7) // set limit
var sorts D
sorts = append(sorts, E{Key: "weight", Value: 1})
findOptions.SetSort(sorts) // set sort

batch := []UserInfo{}
cur, err := coll.Find(ctx, bson.M{"age": 6}, findOptions)
cur.All(ctx, &batch)

How do we do in Qmgo and mgo:

// qmgo
// find all, sort and limit
batch := []UserInfo{}
cli.Find(ctx, bson.M{"age": 6}).Sort("weight").Limit(7).All(&batch)

// mgo
// find all, sort and limit
coll.Find(bson.M{"age": 6}).Sort("weight").Limit(7).All(&batch)

Qmgo vs mgo

Differences between qmgo and mgo

Contributing

The Qmgo project welcomes all contributors. We appreciate your help!

Communication: