ade11fe9f4
* *: support history read. This commit only handles the case when scheme does not change. Use history schema will be supported in the following PR.
45 lines
1.3 KiB
Go
45 lines
1.3 KiB
Go
// 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 context
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import (
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"fmt"
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"github.com/pingcap/tidb/kv"
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)
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// Context is an interface for transaction and executive args environment.
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type Context interface {
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// GetTxn gets a transaction for further execution.
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GetTxn(forceNew bool) (kv.Transaction, error)
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// GetClient gets a kv.Client.
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GetClient() kv.Client
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// RollbackTxn rolls back the current transaction.
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RollbackTxn() error
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// CommitTxn commits the current transaction.
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CommitTxn() error
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// SetValue saves a value associated with this context for key.
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SetValue(key fmt.Stringer, value interface{})
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// Value returns the value associated with this context for key.
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Value(key fmt.Stringer) interface{}
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// ClearValue clears the value associated with this context for key.
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ClearValue(key fmt.Stringer)
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}
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