mirror of https://github.com/tikv/client-go.git
145 lines
2.8 KiB
Go
145 lines
2.8 KiB
Go
// Copyright 2019 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package main
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import (
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"context"
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"flag"
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"fmt"
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"os"
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"github.com/tikv/client-go/config"
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"github.com/tikv/client-go/key"
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"github.com/tikv/client-go/txnkv"
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)
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// KV represents a Key-Value pair.
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type KV struct {
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K, V []byte
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}
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func (kv KV) String() string {
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return fmt.Sprintf("%s => %s (%v)", kv.K, kv.V, kv.V)
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}
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var (
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client *txnkv.Client
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pdAddr = flag.String("pd", "127.0.0.1:2379", "pd address")
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)
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// Init initializes information.
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func initStore() {
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var err error
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client, err = txnkv.NewClient(context.TODO(), []string{*pdAddr}, config.Default())
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if err != nil {
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panic(err)
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}
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}
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// key1 val1 key2 val2 ...
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func puts(args ...[]byte) error {
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tx, err := client.Begin(context.TODO())
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if err != nil {
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return err
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}
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for i := 0; i < len(args); i += 2 {
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key, val := args[i], args[i+1]
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err := tx.Set(key, val)
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if err != nil {
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return err
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}
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}
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return tx.Commit(context.Background())
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}
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func get(k []byte) (KV, error) {
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tx, err := client.Begin(context.TODO())
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if err != nil {
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return KV{}, err
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}
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v, err := tx.Get(context.TODO(), k)
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if err != nil {
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return KV{}, err
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}
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return KV{K: k, V: v}, nil
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}
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func dels(keys ...[]byte) error {
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tx, err := client.Begin(context.TODO())
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if err != nil {
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return err
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}
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for _, key := range keys {
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err := tx.Delete(key)
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if err != nil {
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return err
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}
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}
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return tx.Commit(context.Background())
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}
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func scan(keyPrefix []byte, limit int) ([]KV, error) {
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tx, err := client.Begin(context.TODO())
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if err != nil {
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return nil, err
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}
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it, err := tx.Iter(context.TODO(), key.Key(keyPrefix), nil)
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if err != nil {
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return nil, err
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}
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defer it.Close()
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var ret []KV
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for it.Valid() && limit > 0 {
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ret = append(ret, KV{K: it.Key()[:], V: it.Value()[:]})
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limit--
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it.Next(context.TODO())
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}
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return ret, nil
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}
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func main() {
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pdAddr := os.Getenv("PD_ADDR")
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if pdAddr != "" {
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os.Args = append(os.Args, "-pd", pdAddr)
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}
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flag.Parse()
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initStore()
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// set
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err := puts([]byte("key1"), []byte("value1"), []byte("key2"), []byte("value2"))
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if err != nil {
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panic(err)
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}
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// get
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kv, err := get([]byte("key1"))
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if err != nil {
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panic(err)
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}
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fmt.Println(kv)
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// scan
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ret, err := scan([]byte("key"), 10)
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for _, kv := range ret {
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fmt.Println(kv)
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}
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// delete
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err = dels([]byte("key1"), []byte("key2"))
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if err != nil {
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panic(err)
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}
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}
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