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main.go
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main.go
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package main
import (
"fmt"
"io/ioutil"
"log"
"os"
"github.com/nutsdb/nutsdb"
)
var (
db *nutsdb.DB
bucket string
)
func init() {
fileDir := "/tmp/nutsdb_example"
files, _ := ioutil.ReadDir(fileDir)
for _, f := range files {
name := f.Name()
if name != "" {
fmt.Println(fileDir + "/" + name)
err := os.RemoveAll(fileDir + "/" + name)
if err != nil {
panic(err)
}
}
}
db, _ = nutsdb.Open(
nutsdb.DefaultOptions,
nutsdb.WithDir(fileDir),
nutsdb.WithSegmentSize(1024*1024), // 1MB
)
bucket = "bucketForString"
}
func main() {
// create bucket first
createBucket()
// insert
put()
// read
read()
// delete
delete()
// read
read()
// insert
put()
// read
read()
// update
put2()
// read
read()
// get value length
valueLen()
// get new value and old value
getSet()
// read
read()
//put if not exists
put3()
//put if exits
put4()
// get remaining TTL
getTTL()
// save name2 as persistent
persist()
}
func createBucket() {
if err := db.Update(
func(tx *nutsdb.Tx) error {
return tx.NewBucket(nutsdb.DataStructureBTree, bucket)
}); err != nil {
log.Fatal(err)
}
}
func delete() {
if err := db.Update(
func(tx *nutsdb.Tx) error {
key := []byte("name1")
return tx.Delete(bucket, key)
}); err != nil {
log.Fatal(err)
}
}
func put() {
if err := db.Update(
func(tx *nutsdb.Tx) error {
key := []byte("name1")
val := []byte("val1")
return tx.Put(bucket, key, val, 0)
}); err != nil {
log.Fatal(err)
}
}
func put2() {
if err := db.Update(
func(tx *nutsdb.Tx) error {
key := []byte("name1")
val := []byte("val2")
return tx.Put(bucket, key, val, 0)
}); err != nil {
log.Fatal(err)
}
}
func put3() {
if err := db.Update(
func(tx *nutsdb.Tx) error {
key := []byte("name2")
val := []byte("val2")
return tx.PutIfNotExists(bucket, key, val, 0)
}); err != nil {
log.Fatal(err)
}
}
func put4() {
if err := db.Update(
func(tx *nutsdb.Tx) error {
key := []byte("name2")
val := []byte("val2")
return tx.PutIfExists(bucket, key, val, 100)
}); err != nil {
log.Fatal(err)
}
}
func read() {
if err := db.View(
func(tx *nutsdb.Tx) error {
key := []byte("name1")
value, err := tx.Get(bucket, key)
if err != nil {
return err
}
fmt.Println("val:", string(value))
return nil
}); err != nil {
log.Println(err)
}
}
func valueLen() {
if err := db.View(
func(tx *nutsdb.Tx) error {
key := []byte("name1")
value, err := tx.ValueLen(bucket, key)
if err != nil {
return err
}
fmt.Println("value length:", value)
return nil
}); err != nil {
log.Println(err)
}
}
func getSet() {
if err := db.Update(
func(tx *nutsdb.Tx) error {
key := []byte("name1")
val := []byte("val3")
oldValue, err := tx.GetSet(bucket, key, val)
if err != nil {
return err
}
fmt.Println("old value :", string(oldValue))
return nil
}); err != nil {
log.Println(err)
}
}
func getTTL() {
if err := db.View(func(tx *nutsdb.Tx) error {
key := []byte("name2")
ttl, err := tx.GetTTL(bucket, key)
if err != nil {
return err
}
fmt.Println("ttl :", ttl)
return nil
}); err != nil {
log.Println(err)
}
}
func persist() {
if err := db.Update(func(tx *nutsdb.Tx) error {
key := []byte("name2")
return tx.Persist(bucket, key)
}); err != nil {
log.Println(err)
}
}