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How to Work With Databend in Golang

Before You Begin​

Create Databend User​

mysql -h127.0.0.1 -uroot -P3307

Create a User​

CREATE USER user1 IDENTIFIED BY 'abc123';

Grants Privileges​

Grants ALL privileges to the user user1:

GRANT ALL on *.* TO user1;

Golang​

This guideline show how to connect and query to Databend using Golang. We will be creating a table named books and insert a row, then query it.

main.go​

main.go
package main

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

    _ "github.com/databendcloud/databend-go"
)

const (
    username = "user1"
    password = "abc123"
    hostname = "127.0.0.1:8000"
)

type Book struct {
    Title  string
    Author string
    Date   string
}

func dsn() string {
    return fmt.Sprintf("http://%s:%s@%s", username, password, hostname)
}

func main() {
    db, err := sql.Open("databend", dsn())

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

    err = db.Ping()
    if err != nil {
        log.Fatal(err)
    }
    log.Println("Connected")

    // Create db if do not exist
    dbSql := "CREATE DATABASE IF NOT EXISTS book_db"
    _, err = db.Exec(dbSql)
    if err != nil {
        log.Fatal(err)
    }
    log.Println("Create database book_db success")

    // Use book_db database
    _, err = db.Exec("USE book_db")
    if err != nil {
        log.Fatal(err)
    }

    // Create table.
    sql := "create table if not exists books(title VARCHAR, author VARCHAR, date VARCHAR)"
    _, err = db.Exec(sql)
    if err != nil {
        log.Fatal(err)
    }
    log.Println("Create table: books")

    // Insert 1 row.
    _, err = db.Exec("INSERT INTO books VALUES(?, ?, ?)", "mybook", "author", "2022")
    if err != nil {
        log.Fatal(err)
    }
    log.Println("Insert 1 row")

    // Select.
    res, err := db.Query("SELECT * FROM books")
    if err != nil {
        log.Fatal(err)
    }

    for res.Next() {
        var book Book
        err := res.Scan(&book.Title, &book.Author, &book.Date)
        if err != nil {
            log.Fatal(err)
        }

        log.Printf("Select:%v", book)
    }
    db.Exec("drop table books")
    db.Exec("drop database book_db")
}

Golang mod​

go mod init databend-golang
go.mod
module databend-golang

go 1.20

require github.com/databendcloud/databend-go v0.3.10

require (
    github.com/BurntSushi/toml v1.2.1 // indirect
    github.com/avast/retry-go v3.0.0+incompatible // indirect
    github.com/google/uuid v1.3.0 // indirect
    github.com/pkg/errors v0.9.1 // indirect
    github.com/sirupsen/logrus v1.9.0 // indirect
    golang.org/x/sys v0.5.0 // indirect
)

Run main.go​

go run main.go
Outputs
2023/02/24 23:57:31 Connected
2023/02/24 23:57:31 Create database book_db success
2023/02/24 23:57:31 Create table: books
2023/02/24 23:57:31 Insert 1 row
2023/02/24 23:57:31 Select:{mybook author 2022}