ClickHouse

Golang SQL database driver for Yandex ClickHouse

Key features

• Uses native ClickHouse tcp client-server protocol
• Compatibility with database/sql
• Round Robin load-balancing
• Bulk write support : begin->prepare->(in loop exec)->commit
• LZ4 compression support (default to use pure go lz4, switch to use cgo lz4 by turn clz4 build tags on)

DSN

• username/password - auth credentials
• database - select the current default database
• read_timeout/write_timeout - timeout in second
• no_delay - disable/enable the Nagle Algorithm for tcp socket (default is 'true' - disable)
• alt_hosts - comma separated list of single address host for load-balancing
• connection_open_strategy - random/in_order (default random).
  • random - choose random server from set
  • in_order - first live server is choosen in specified order
  • time_random - choose random(based on current time) server from set. This option differs from random in that randomness is based on current time rather than on amount of previous connections.
• block_size - maximum rows in block (default is 1000000). If the rows are larger then the data will be split into several blocks to send them to the server. If one block was sent to the server, the data will be persisted on the server disk, we can't rollback the transaction. So always keep in mind that the batch size no larger than the block_size if you want atomic batch insert.
• pool_size - maximum amount of preallocated byte chunks used in queries (default is 100). Decrease this if you experience memory problems at the expense of more GC pressure and vice versa.
• debug - enable debug output (boolean value)

SSL/TLS parameters:

• secure - establish secure connection (default is false)
• skip_verify - skip certificate verification (default is false)
• tls_config - name of a TLS config with client certificates, registered using clickhouse.RegisterTLSConfig(); implies secure to be true, unless explicitly specified

example:

tcp://host1:9000?username=user&password=qwerty&database=clicks&read_timeout=10&write_timeout=20&alt_hosts=host2:9000,host3:9000

Supported data types

• UInt8, UInt16, UInt32, UInt64, Int8, Int16, Int32, Int64
• Float32, Float64
• String
• FixedString(N)
• Date
• DateTime
• IPv4
• IPv6
• Enum
• UUID
• Nullable(T)
• Array(T) (one-dimensional) godoc

TODO

• Support other compression methods(zstd ...)

Install

go get -u github.com/ClickHouse/clickhouse-go

Example

package main

import (
	"database/sql"
	"fmt"
	"log"
	"time"

	"github.com/ClickHouse/clickhouse-go"
)

func main() {
	connect, err := sql.Open("clickhouse", "tcp://127.0.0.1:9000?debug=true")
	if err != nil {
		log.Fatal(err)
	}
	if err := connect.Ping(); err != nil {
		if exception, ok := err.(*clickhouse.Exception); ok {
			fmt.Printf("[%d] %s \n%s\n", exception.Code, exception.Message, exception.StackTrace)
		} else {
			fmt.Println(err)
		}
		return
	}

	_, err = connect.Exec(`
		CREATE TABLE IF NOT EXISTS example (
			country_code FixedString(2),
			os_id        UInt8,
			browser_id   UInt8,
			categories   Array(Int16),
			action_day   Date,
			action_time  DateTime
		) engine=Memory
	`)

	if err != nil {
		log.Fatal(err)
	}
	var (
		tx, _   = connect.Begin()
		stmt, _ = tx.Prepare("INSERT INTO example (country_code, os_id, browser_id, categories, action_day, action_time) VALUES (?, ?, ?, ?, ?, ?)")
	)
	defer stmt.Close()

	for i := 0; i < 100; i++ {
		if _, err := stmt.Exec(
			"RU",
			10+i,
			100+i,
			clickhouse.Array([]int16{1, 2, 3}),
			time.Now(),
			time.Now(),
		); err != nil {
			log.Fatal(err)
		}
	}

	if err := tx.Commit(); err != nil {
		log.Fatal(err)
	}

	rows, err := connect.Query("SELECT country_code, os_id, browser_id, categories, action_day, action_time FROM example")
	if err != nil {
		log.Fatal(err)
	}
	defer rows.Close()

	for rows.Next() {
		var (
			country               string
			os, browser           uint8
			categories            []int16
			actionDay, actionTime time.Time
		)
		if err := rows.Scan(&country, &os, &browser, &categories, &actionDay, &actionTime); err != nil {
			log.Fatal(err)
		}
		log.Printf("country: %s, os: %d, browser: %d, categories: %v, action_day: %s, action_time: %s", country, os, browser, categories, actionDay, actionTime)
	}

	if err := rows.Err(); err != nil {
		log.Fatal(err)
	}

	if _, err := connect.Exec("DROP TABLE example"); err != nil {
		log.Fatal(err)
	}
}

Use sqlx

package main

import (
	"log"
	"time"

	"github.com/jmoiron/sqlx"
	_ "github.com/ClickHouse/clickhouse-go"
)

func main() {
	connect, err := sqlx.Open("clickhouse", "tcp://127.0.0.1:9000?debug=true")
	if err != nil {
		log.Fatal(err)
	}
	var items []struct {
		CountryCode string    `db:"country_code"`
		OsID        uint8     `db:"os_id"`
		BrowserID   uint8     `db:"browser_id"`
		Categories  []int16   `db:"categories"`
		ActionTime  time.Time `db:"action_time"`
	}

	if err := connect.Select(&items, "SELECT country_code, os_id, browser_id, categories, action_time FROM example"); err != nil {
		log.Fatal(err)
	}

	for _, item := range items {
		log.Printf("country: %s, os: %d, browser: %d, categories: %v, action_time: %s", item.CountryCode, item.OsID, item.BrowserID, item.Categories, item.ActionTime)
	}
}