Go

 Requires at least Go 1.11
export GO111MODULE=on
go get -u -v github.com/dgraph-io/dgo/v200

func newClient() *dgo.Dgraph {
	// Dial a gRPC connection. The address to dial to can be configured when
	// setting up the dgraph cluster.
	d, err := grpc.Dial("localhost:9080", grpc.WithInsecure())
	if err != nil {
		log.Fatal(err)
	}

	return dgo.NewDgraphClient(
		api.NewDgraphClient(d),
	)
}

func newClient() *dgo.Dgraph {
	// Dial a gRPC connection. The address to dial to can be configured when
	// setting up the dgraph cluster.
	dialOpts := append([]grpc.DialOption{},
		grpc.WithInsecure(),
		grpc.WithDefaultCallOptions(grpc.UseCompressor(gzip.Name)))
	d, err := grpc.Dial("localhost:9080", dialOpts...)

	if err != nil {
		log.Fatal(err)
	}

	return dgo.NewDgraphClient(
		api.NewDgraphClient(d),
	)
}

conn, err := grpc.Dial("127.0.0.1:9080", grpc.WithInsecure())
if err != nil {
	glog.Error("While trying to dial gRPC, got error", err)
}
dc := dgo.NewDgraphClient(api.NewDgraphClient(conn))
ctx := context.Background()
// Login to namespace 123
if err := dc.LoginIntoNamespace(ctx, "groot", "password", 123); err != nil {
	glog.Error("Failed to login: ",err)
}

// This example uses dgo
conn, err := dgo.DialCloud("https://frozen-mango.eu-central-1.aws.cloud.dgraph.io/graphql", "<api-key>")
if err != nil {
  log.Fatal(err)
}
defer conn.Close()
dgraphClient := dgo.NewDgraphClient(api.NewDgraphClient(conn))

func setup(c *dgo.Dgraph) {
	// Install a schema into dgraph. Accounts have a `name` and a `balance`.
	err := c.Alter(context.Background(), &api.Operation{
		Schema: `
			name: string @index(term) .
			balance: int .
		`,
	})
}

	// Drop all data including schema from the dgraph instance. This is useful
	// for small examples such as this, since it puts dgraph into a clean
	// state.
	err := c.Alter(context.Background(), &api.Operation{DropOp: api.Operation_ALL})

	// Drop all data including schema from the dgraph instance. This is useful
	// for small examples such as this, since it puts dgraph into a clean
	// state.
	err := c.Alter(context.Background(), &api.Operation{DropAll: true})

	// Drop all data including schema from the dgraph instance. This is useful
	// for small examples such as this, since it puts dgraph into a clean
	// state.
	err := c.Alter(context.Background(), &api.Operation{DropOp: api.Operation_DATA})

func runTxn(c *dgo.Dgraph) {
	txn := c.NewTxn()
	defer txn.Discard(ctx)
	...
}

	// Query the balance for Alice and Bob.
	const q = `
		{
			all(func: anyofterms(name, "Alice Bob")) {
				uid
				balance
			}
		}
	`
	resp, err := txn.Query(context.Background(), q)
	if err != nil {
		log.Fatal(err)
	}

	// After we get the balances, we have to decode them into structs so that
	// we can manipulate the data.
	var decode struct {
		All []struct {
			Uid     string
			Balance int
		}
	}
	if err := json.Unmarshal(resp.GetJson(), &decode); err != nil {
		log.Fatal(err)
	}

	// Query the balance for Alice and Bob.
	const q = `
		{
			all(func: anyofterms(name, "Alice Bob")) {
				name
				balance
			}
		}
	`
	resp, err := txn.QueryRDF(context.Background(), q)
	if err != nil {
		log.Fatal(err)
	}
 
	// <0x17> <name> "Alice" .
	// <0x17> <balance> 100 .
	fmt.Println(resp.Rdf)

	// Move $5 between the two accounts.
	decode.All[0].Bal += 5
	decode.All[1].Bal -= 5

	out, err := json.Marshal(decode.All)
	if err != nil {
		log.Fatal(err)
	}

	_, err := txn.Mutate(context.Background(), &api.Mutation{SetJson: out})

	// Finally, we can commit the transactions. An error will be returned if
	// other transactions running concurrently modify the same data that was
	// modified in this transaction. It is up to the library user to retry
	// transactions when they fail.

	err := txn.Commit(context.Background())

package dgo_test

import (
	"context"
	"encoding/json"
	"fmt"
	"log"
	"time"

	"github.com/dgraph-io/dgo/v200/protos/api"
)

type School struct {
	Name  string   `json:"name,omitempty"`
	DType []string `json:"dgraph.type,omitempty"`
}

type loc struct {
	Type   string    `json:"type,omitempty"`
	Coords []float64 `json:"coordinates,omitempty"`
}

// If omitempty is not set, then edges with empty values (0 for int/float, "" for string, false
// for bool) would be created for values not specified explicitly.

type Person struct {
	Uid      string     `json:"uid,omitempty"`
	Name     string     `json:"name,omitempty"`
	Age      int        `json:"age,omitempty"`
	Dob      *time.Time `json:"dob,omitempty"`
	Married  bool       `json:"married,omitempty"`
	Raw      []byte     `json:"raw_bytes,omitempty"`
	Friends  []Person   `json:"friend,omitempty"`
	Location loc        `json:"loc,omitempty"`
	School   []School   `json:"school,omitempty"`
	DType    []string   `json:"dgraph.type,omitempty"`
}

func Example_setObject() {
	dg, cancel := getDgraphClient()
	defer cancel()

	dob := time.Date(1980, 01, 01, 23, 0, 0, 0, time.UTC)
	// While setting an object if a struct has a Uid then its properties in the graph are updated
	// else a new node is created.
	// In the example below new nodes for Alice, Bob and Charlie and school are created (since they
	// don't have a Uid).
	p := Person{
		Uid:     "_:alice",
		Name:    "Alice",
		Age:     26,
		Married: true,
		DType:   []string{"Person"},
		Location: loc{
			Type:   "Point",
			Coords: []float64{1.1, 2},
		},
		Dob: &dob,
		Raw: []byte("raw_bytes"),
		Friends: []Person{{
			Name:  "Bob",
			Age:   24,
			DType: []string{"Person"},
		}, {
			Name:  "Charlie",
			Age:   29,
			DType: []string{"Person"},
		}},
		School: []School{{
			Name:  "Crown Public School",
			DType: []string{"Institution"},
		}},
	}

	op := &api.Operation{}
	op.Schema = `
		name: string @index(exact) .
		age: int .
		married: bool .
		loc: geo .
		dob: datetime .
		Friend: [uid] .
		type: string .
		coords: float .
		type Person {
			name: string
			age: int
			married: bool
			Friend: [Person]
			loc: Loc
		}
		type Institution {
			name: string
		}
		type Loc {
			type: string
			coords: float
		}
	`

	ctx := context.Background()
	if err := dg.Alter(ctx, op); err != nil {
		log.Fatal(err)
	}

	mu := &api.Mutation{
		CommitNow: true,
	}
	pb, err := json.Marshal(p)
	if err != nil {
		log.Fatal(err)
	}

	mu.SetJson = pb
	response, err := dg.NewTxn().Mutate(ctx, mu)
	if err != nil {
		log.Fatal(err)
	}

	// Assigned uids for nodes which were created would be returned in the response.Uids map.
	variables := map[string]string{"$id1": response.Uids["alice"]}
	q := `query Me($id1: string){
		me(func: uid($id1)) {
			name
			dob
			age
			loc
			raw_bytes
			married
			dgraph.type
			friend @filter(eq(name, "Bob")){
				name
				age
				dgraph.type
			}
			school {
				name
				dgraph.type
			}
		}
	}`

	resp, err := dg.NewTxn().QueryWithVars(ctx, q, variables)
	if err != nil {
		log.Fatal(err)
	}

	type Root struct {
		Me []Person `json:"me"`
	}

	var r Root
	err = json.Unmarshal(resp.Json, &r)
	if err != nil {
		log.Fatal(err)
	}

	out, _ := json.MarshalIndent(r, "", "\t")
	fmt.Printf("%s\n", out)
}

 Output: {
 	"me": [
 		{
 			"name": "Alice",
 			"age": 26,
 			"dob": "1980-01-01T23:00:00Z",
 			"married": true,
 			"raw_bytes": "cmF3X2J5dGVz",
 			"friend": [
 				{
 					"name": "Bob",
 					"age": 24,
 					"loc": {},
 					"dgraph.type": [
 						"Person"
 					]
 				}
 			],
 			"loc": {
 				"type": "Point",
 				"coordinates": [
 					1.1,
 					2
 				]
 			},
 			"school": [
 				{
 					"name": "Crown Public School",
 					"dgraph.type": [
 						"Institution"
 					]
 				}
 			],
 			"dgraph.type": [
 				"Person"
 			]
 		}
 	]
 }