15356cdd88
This variable was intended to prevent restricted SQL from being committed. But it is executed at statement level, will never be committed, so this is not needed. Also, when begin a new transaction in executing restricted SQL, If 'autocommit' is 'on'. This variable makes the new transaction into a unwanted `InTrans` state, so following statements will not be autocommited.
37 lines
1.7 KiB
Go
37 lines
1.7 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 sqlexec
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import (
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"github.com/pingcap/tidb/ast"
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"github.com/pingcap/tidb/context"
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)
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// RestrictedSQLExecutor is an interface provides executing restricted sql statement.
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// Why we need this interface?
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// When we execute some management statements, we need to operate system tables.
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// For example when executing create user statement, we need to check if the user already
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// exists in the mysql.User table and insert a new row if not exists. In this case, we need
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// a convenience way to manipulate system tables. The most simple way is executing sql statement.
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// In order to execute sql statement in stmts package, we add this interface to solve dependence problem.
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// And in the same time, we do not want this interface becomes a general way to run sql statement.
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// We hope this could be used with some restrictions such as only allowing system tables as target,
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// do not allowing recursion call.
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// For more infomation please refer to the comments in session.ExecRestrictedSQL().
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// This is implemented in session.go.
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type RestrictedSQLExecutor interface {
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// ExecRestrictedSQL run sql statement in ctx with some restriction.
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ExecRestrictedSQL(ctx context.Context, sql string) (ast.RecordSet, error)
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}
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