113 lines
3.2 KiB
Go
113 lines
3.2 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 executor
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import (
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"context"
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"github.com/pingcap/errors"
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"github.com/pingcap/parser/ast"
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"github.com/pingcap/tidb/bindinfo"
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"github.com/pingcap/tidb/domain"
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plannercore "github.com/pingcap/tidb/planner/core"
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"github.com/pingcap/tidb/util/chunk"
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)
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// SQLBindExec represents a bind executor.
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type SQLBindExec struct {
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baseExecutor
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sqlBindOp plannercore.SQLBindOpType
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normdOrigSQL string
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bindSQL string
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charset string
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collation string
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isGlobal bool
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bindAst ast.StmtNode
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}
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// Next implements the Executor Next interface.
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func (e *SQLBindExec) Next(ctx context.Context, req *chunk.Chunk) error {
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req.Reset()
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switch e.sqlBindOp {
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case plannercore.OpSQLBindCreate:
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return e.createSQLBind()
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case plannercore.OpSQLBindDrop:
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return e.dropSQLBind()
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case plannercore.OpFlushBindings:
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return e.flushBindings()
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case plannercore.OpCaptureBindings:
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e.captureBindings()
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case plannercore.OpEvolveBindings:
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return e.evolveBindings()
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default:
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return errors.Errorf("unsupported SQL bind operation: %v", e.sqlBindOp)
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}
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return nil
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}
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func (e *SQLBindExec) dropSQLBind() error {
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record := &bindinfo.BindRecord{
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OriginalSQL: e.normdOrigSQL,
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Db: e.ctx.GetSessionVars().CurrentDB,
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}
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if e.bindSQL != "" {
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bindInfo := bindinfo.Binding{
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BindSQL: e.bindSQL,
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Charset: e.charset,
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Collation: e.collation,
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}
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record.Bindings = append(record.Bindings, bindInfo)
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}
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if !e.isGlobal {
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handle := e.ctx.Value(bindinfo.SessionBindInfoKeyType).(*bindinfo.SessionHandle)
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return handle.DropBindRecord(e.ctx, GetInfoSchema(e.ctx), record)
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}
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return domain.GetDomain(e.ctx).BindHandle().DropBindRecord(e.ctx, GetInfoSchema(e.ctx), record)
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}
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func (e *SQLBindExec) createSQLBind() error {
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bindInfo := bindinfo.Binding{
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BindSQL: e.bindSQL,
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Charset: e.charset,
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Collation: e.collation,
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Status: bindinfo.Using,
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}
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record := &bindinfo.BindRecord{
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OriginalSQL: e.normdOrigSQL,
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Db: e.ctx.GetSessionVars().CurrentDB,
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Bindings: []bindinfo.Binding{bindInfo},
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}
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if !e.isGlobal {
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handle := e.ctx.Value(bindinfo.SessionBindInfoKeyType).(*bindinfo.SessionHandle)
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return handle.AddBindRecord(e.ctx, GetInfoSchema(e.ctx), record)
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}
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return domain.GetDomain(e.ctx).BindHandle().AddBindRecord(e.ctx, GetInfoSchema(e.ctx), record)
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}
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func (e *SQLBindExec) flushBindings() error {
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handle := domain.GetDomain(e.ctx).BindHandle()
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handle.DropInvalidBindRecord()
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handle.SaveEvolveTasksToStore()
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return handle.Update(false)
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}
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func (e *SQLBindExec) captureBindings() {
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domain.GetDomain(e.ctx).BindHandle().CaptureBaselines()
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}
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func (e *SQLBindExec) evolveBindings() error {
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return domain.GetDomain(e.ctx).BindHandle().HandleEvolvePlanTask(e.ctx)
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}
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