README.md

GocqlX

GocqlX makes working with Scylla easy and less error-prone. It’s inspired by Sqlx, a tool for working with SQL databases, but it goes beyond what Sqlx provides.

Features

• Binding query parameters from struct fields, map, or both
• Scanning query results into structs based on field names
• Convenient functions for common tasks such as loading a single row into a struct or all rows into a slice (list) of structs
• Making any struct a UDT without implementing marshalling functions
• GocqlX is fast. Its performance is comparable to raw driver. You can find some benchmarks here.

Subpackages provide additional functionality:

• CQL query builder (package qb)
• CRUD operations based on table model (package table)
• Database migrations (package migrate)

Installation

    go get -u github.com/scylladb/gocqlx/v2

Getting started

Wrap gocql Session:

// 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 {
	t.Fatal(err)
}

Specify table model:

// 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 camel case by default, no need to add special tags.
// If you want to disable a field add `db:"-"` tag, it will not be persisted.
type Person struct {
	FirstName string
	LastName  string
	Email     []string
}

Bind data from a struct and insert a row:

p := Person{
	"Michał",
	"Matczuk",
	[]string{"[email protected]"},
}
q := session.Query(personTable.Insert()).BindStruct(p)
if err := q.ExecRelease(); err != nil {
	t.Fatal(err)
}

Load a single row to a struct:

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

Load all rows in to a slice:

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

Examples

You can find lots of examples in example_test.go.

Go and run them locally:

make run-scylla
make run-examples

Performance

GocqlX performance is comparable to the raw gocql driver. Below benchmark results running on my laptop.

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

See the benchmark in benchmark_test.go.

License

Copyright (C) 2017 ScyllaDB

This project is distributed under the Apache 2.0 license. See the LICENSE file for details. It contains software from:

• gocql project, licensed under the BSD license
• sqlx project, licensed under the MIT license

Apache®, Apache Cassandra® are either registered trademarks or trademarks of the Apache Software Foundation in the United States and/or other countries. No endorsement by The Apache Software Foundation is implied by the use of these marks.

GitHub star is always appreciated!