scylladb/gocqlx

// Use the latest version of scylladb/gocql; check for updates at https://github.com/scylladb/gocql/releases
replace github.com/gocql/gocql => github.com/scylladb/gocql v1.16.0

go get github.com/scylladb/gocqlx/v3

git clone [email protected]:scylladb/gocqlx.git
cd gocqlx/cmd/schemagen/
go install .

import (
	"fmt"
	"log"

	"github.com/gocql/gocql"
	"github.com/scylladb/gocqlx/v3"
	"github.com/scylladb/gocqlx/v3/qb"
	"github.com/scylladb/gocqlx/v3/table"
)

// Create gocql cluster.
cluster := gocql.NewCluster(hosts...)
// Wrap session on creation, gocqlx session embeds gocql.Session pointer.
session, err := gocqlx.WrapSession(cluster.CreateSession())
if err != nil {
	log.Fatal(err)
}
defer session.Close()

// metadata specifies table name and columns it must be in sync with schema.
var personMetadata = table.Metadata{
	Name:    "person",
	Columns: []string{"first_name", "last_name", "email"},
	PartKey: []string{"first_name"},
	SortKey: []string{"last_name"},
}

// personTable allows for simple CRUD operations based on personMetadata.
var personTable = table.New(personMetadata)

// Person represents a row in person table.
// Field names are converted to snake case by default, no need to add special tags.
// A field will not be persisted by adding the `db:"-"` tag or making it unexported.
type Person struct {
	FirstName string
	LastName  string
	Email     []string
	HairColor string `db:"-"`  // exported and skipped
	eyeColor  string           // unexported also skipped
}

p := Person{
	"Michał",
	"Matczuk",
	[]string{"[email protected]"},
	"red",    // not persisted
	"hazel"   // not persisted
}
q := session.Query(personTable.Insert()).BindStruct(p)
if err := q.ExecRelease(); err != nil {
	log.Fatal(err)
}

p := Person{
	"Michał",
	"Matczuk",
	nil, // no email
}
q := session.Query(personTable.Get()).BindStruct(p)
if err := q.GetRelease(&p); err != nil {
	log.Fatal(err)
}
fmt.Println(p)
// stdout: {Michał Matczuk [[email protected]]}

var people []Person
q := session.Query(personTable.Select()).BindMap(qb.M{"first_name": "Michał"})
if err := q.SelectRelease(&people); err != nil {
	log.Fatal(err)
}
fmt.Println(people)
// stdout: [{Michał Matczuk [[email protected]]}]

go get -u "github.com/scylladb/gocqlx/v3/cmd/schemagen"

schemagen [flags]

Flags:
  -cluster string
    	a comma-separated list of host:port tuples (default "127.0.0.1")
  -keyspace string
    	keyspace to inspect (required)
  -output string
    	the name of the folder to output to (default "models")
  -pkgname string
    	the name you wish to assign to your generated package (default "models") 

schemagen -cluster="127.0.0.1:9042" -keyspace="examples" -output="models" -pkgname="models"

// Code generated by "gocqlx/cmd/schemagen"; DO NOT EDIT.

package models

import "github.com/scylladb/gocqlx/v3/table"

// Table models.
var (
	Playlists = table.New(table.Metadata{
		Name: "playlists",
		Columns: []string{
			"album",
			"artist",
			"id",
			"song_id",
			"title",
		},
		PartKey: []string{
			"id",
		},
		SortKey: []string{
			"title",
			"album",
			"artist",
		},
	})

	Songs = table.New(table.Metadata{
		Name: "songs",
		Columns: []string{
			"album",
			"artist",
			"data",
			"id",
			"tags",
			"title",
		},
		PartKey: []string{
			"id",
		},
		SortKey: []string{},
	})
)

make run-scylla
make run-examples

BenchmarkBaseGocqlInsert            2392            427491 ns/op            7804 B/op         39 allocs/op
BenchmarkGocqlxInsert               2479            435995 ns/op            7803 B/op         39 allocs/op
BenchmarkBaseGocqlGet               2853            452384 ns/op            7309 B/op         35 allocs/op
BenchmarkGocqlxGet                  2706            442645 ns/op            7646 B/op         38 allocs/op
BenchmarkBaseGocqlSelect             747           1664365 ns/op           49415 B/op        927 allocs/op
BenchmarkGocqlxSelect                667           1877859 ns/op           42521 B/op        932 allocs/op