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// Copyright 2019 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package executor
import (
"context"
"github.com/pingcap/errors"
"github.com/pingcap/parser/ast"
"github.com/pingcap/tidb/bindinfo"
"github.com/pingcap/tidb/domain"
plannercore "github.com/pingcap/tidb/planner/core"
"github.com/pingcap/tidb/util/chunk"
)
// SQLBindExec represents a bind executor.
type SQLBindExec struct {
baseExecutor
sqlBindOp plannercore.SQLBindOpType
normdOrigSQL string
bindSQL string
charset string
collation string
db string
isGlobal bool
bindAst ast.StmtNode
}
// Next implements the Executor Next interface.
func (e *SQLBindExec) Next(ctx context.Context, req *chunk.Chunk) error {
req.Reset()
switch e.sqlBindOp {
case plannercore.OpSQLBindCreate:
return e.createSQLBind()
case plannercore.OpSQLBindDrop:
return e.dropSQLBind()
case plannercore.OpFlushBindings:
return e.flushBindings()
case plannercore.OpCaptureBindings:
e.captureBindings()
case plannercore.OpEvolveBindings:
return e.evolveBindings()
case plannercore.OpReloadBindings:
return e.reloadBindings()
default:
return errors.Errorf("unsupported SQL bind operation: %v", e.sqlBindOp)
}
return nil
}
func (e *SQLBindExec) dropSQLBind() error {
var bindInfo *bindinfo.Binding
if e.bindSQL != "" {
bindInfo = &bindinfo.Binding{
BindSQL: e.bindSQL,
Charset: e.charset,
Collation: e.collation,
}
}
if !e.isGlobal {
handle := e.ctx.Value(bindinfo.SessionBindInfoKeyType).(*bindinfo.SessionHandle)
return handle.DropBindRecord(e.normdOrigSQL, e.db, bindInfo)
}
return domain.GetDomain(e.ctx).BindHandle().DropBindRecord(e.normdOrigSQL, e.db, bindInfo)
}
func (e *SQLBindExec) createSQLBind() error {
bindInfo := bindinfo.Binding{
BindSQL: e.bindSQL,
Charset: e.charset,
Collation: e.collation,
Status: bindinfo.Using,
Source: bindinfo.Manual,
}
record := &bindinfo.BindRecord{
OriginalSQL: e.normdOrigSQL,
Db: e.db,
Bindings: []bindinfo.Binding{bindInfo},
}
if !e.isGlobal {
handle := e.ctx.Value(bindinfo.SessionBindInfoKeyType).(*bindinfo.SessionHandle)
return handle.CreateBindRecord(e.ctx, record)
}
return domain.GetDomain(e.ctx).BindHandle().CreateBindRecord(e.ctx, record)
}
func (e *SQLBindExec) flushBindings() error {
return domain.GetDomain(e.ctx).BindHandle().FlushBindings()
}
func (e *SQLBindExec) captureBindings() {
domain.GetDomain(e.ctx).BindHandle().CaptureBaselines()
}
func (e *SQLBindExec) evolveBindings() error {
return domain.GetDomain(e.ctx).BindHandle().HandleEvolvePlanTask(e.ctx, true)
}
func (e *SQLBindExec) reloadBindings() error {
return domain.GetDomain(e.ctx).BindHandle().ReloadBindings()
}