Illustration of inconsistency of Put semantics: https://github.com/boltdb/bolt/issues/324

boltdb-issue-324.go

package main

import (
	"encoding/binary"
	"fmt"
	"io/ioutil"
	"log"
	"os"
	"path/filepath"

	"github.com/boltdb/bolt"
)

func main() {
	dir, err := ioutil.TempDir("", "boltdb-")
	if err != nil {
		log.Fatal(err)
	}
	defer os.RemoveAll(dir)
	db, err := bolt.Open(filepath.Join(dir, "test.db"), 0644, nil)
	if err != nil {
		log.Print(err)
		return
	}
	defer db.Close()

	err = db.Update(func(tx *bolt.Tx) error {
		bkt, err := tx.CreateBucketIfNotExists([]byte("one"))
		if err != nil {
			return err
		}
		buf := make([]byte, 10)
		for i := int64(0); i < 3; i++ {
			n := binary.PutVarint(buf, i)
			if err := bkt.Put(buf[:n], buf[:n]); err != nil {
				return err
			}
		}
		return nil
	})
	if err != nil {
		log.Print(err)
		return
	}

	err = db.View(func(tx *bolt.Tx) error {
		bkt := tx.Bucket([]byte("one"))
		if bkt == nil {
			return bolt.ErrBucketNotFound
		}
		c := bkt.Cursor()
		for k, v := c.First(); k != nil; k, v = c.Next() {
			fmt.Printf("%v\t%v\n", k, v)
		}
		return nil
	})
	if err != nil {
		log.Print(err)
		return
	}
}