Go

The DuckDB Go driver, go-duckdb, allows using DuckDB via the database/sql interface. For examples on how to use this interface, see the official documentation and tutorial.

The Go client is a third-party library and its repository is hosted https://github.com/marcboeker/go-duckdb.

Installation

To install the go-duckdb client, run:

go get github.com/marcboeker/go-duckdb

Importing

To import the DuckDB Go package, add the following entries to your imports:

import (
	"database/sql"
	_ "github.com/marcboeker/go-duckdb"
)

Appender

The DuckDB Go client supports the DuckDB Appender API for bulk inserts. You can obtain a new Appender by supplying a DuckDB connection to NewAppenderFromConn(). For example:

connector, err := duckdb.NewConnector("test.db", nil)
if err != nil {
  ...
}
conn, err := connector.Connect(context.Background())
if err != nil {
  ...
}
defer conn.Close()

// Retrieve appender from connection (note that you have to create the table 'test' beforehand).
appender, err := NewAppenderFromConn(conn, "", "test")
if err != nil {
  ...
}
defer appender.Close()

err = appender.AppendRow(...)
if err != nil {
  ...
}

// Optional, if you want to access the appended rows immediately.
err = appender.Flush()
if err != nil {
  ...
}

Examples

Simple Example

An example for using the Go API is as follows:

package main

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

	_ "github.com/marcboeker/go-duckdb"
)

func main() {
	db, err := sql.Open("duckdb", "")
	if err != nil {
		log.Fatal(err)
	}
	defer db.Close()

	_, err = db.Exec(`CREATE TABLE people (id INTEGER, name VARCHAR)`)
	if err != nil {
		log.Fatal(err)
	}
	_, err = db.Exec(`INSERT INTO people VALUES (42, 'John')`)
	if err != nil {
		log.Fatal(err)
	}

	var (
		id   int
		name string
	)
	row := db.QueryRow(`SELECT id, name FROM people`)
	err = row.Scan(&id, &name)
	if errors.Is(err, sql.ErrNoRows) {
		log.Println("no rows")
	} else if err != nil {
		log.Fatal(err)
	}

	fmt.Printf("id: %d, name: %s\n", id, name)
}

More Examples

For more examples, see the examples in the duckdb-go repository.