73 lines
1.9 KiB
Go
73 lines
1.9 KiB
Go
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// Copyright 2015 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 structure
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import (
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"strconv"
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"github.com/juju/errors"
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"github.com/pingcap/tidb/kv"
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"github.com/pingcap/tidb/terror"
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)
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// Set sets the string value of the key.
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func (t *TxStructure) Set(key []byte, value []byte) error {
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ek := t.encodeStringDataKey(key)
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return t.txn.Set(ek, value)
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}
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// Get gets the string value of a key.
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func (t *TxStructure) Get(key []byte) ([]byte, error) {
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ek := t.encodeStringDataKey(key)
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value, err := t.txn.Get(ek)
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if terror.ErrorEqual(err, kv.ErrNotExist) {
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err = nil
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}
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return value, errors.Trace(err)
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}
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// GetInt64 gets the int64 value of a key.
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func (t *TxStructure) GetInt64(key []byte) (int64, error) {
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v, err := t.Get(key)
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if err != nil || v == nil {
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return 0, errors.Trace(err)
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}
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n, err := strconv.ParseInt(string(v), 10, 64)
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return n, errors.Trace(err)
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}
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// Inc increments the integer value of a key by step, returns
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// the value after the increment.
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func (t *TxStructure) Inc(key []byte, step int64) (int64, error) {
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ek := t.encodeStringDataKey(key)
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// txn Inc will lock this key, so we don't lock it here.
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n, err := kv.IncInt64(t.txn, ek, step)
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if terror.ErrorEqual(err, kv.ErrNotExist) {
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err = nil
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}
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return n, errors.Trace(err)
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}
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// Clear removes the string value of the key.
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func (t *TxStructure) Clear(key []byte) error {
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ek := t.encodeStringDataKey(key)
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err := t.txn.Delete(ek)
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if terror.ErrorEqual(err, kv.ErrNotExist) {
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err = nil
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}
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return errors.Trace(err)
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}
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