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stmtctx.go
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stmtctx.go
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// Copyright 2017 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 stmtctx
import (
"math"
"sync"
"time"
"github.com/pingcap/tidb/mysql"
"github.com/pingcap/tidb/util/execdetails"
"github.com/pingcap/tidb/util/memory"
)
const (
// WarnLevelWarning represents level "Warning" for 'SHOW WARNINGS' syntax.
WarnLevelWarning = "Warning"
// WarnLevelNote represents level "Note" for 'SHOW WARNINGS' syntax.
WarnLevelNote = "Note"
)
// SQLWarn relates a sql warning and it's level.
type SQLWarn struct {
Level string
Err error
}
// StatementContext contains variables for a statement.
// It should be reset before executing a statement.
type StatementContext struct {
// Set the following variables before execution
InInsertStmt bool
InUpdateOrDeleteStmt bool
InSelectStmt bool
IgnoreTruncate bool
IgnoreZeroInDate bool
DividedByZeroAsWarning bool
TruncateAsWarning bool
OverflowAsWarning bool
InShowWarning bool
UseCache bool
PadCharToFullLength bool
BatchCheck bool
// mu struct holds variables that change during execution.
mu struct {
sync.Mutex
affectedRows uint64
foundRows uint64
warnings []SQLWarn
histogramsNotLoad bool
execDetails execdetails.ExecDetails
}
// Copied from SessionVars.TimeZone.
TimeZone *time.Location
Priority mysql.PriorityEnum
NotFillCache bool
MemTracker *memory.Tracker
TableIDs []int64
IndexIDs []int64
}
// AddAffectedRows adds affected rows.
func (sc *StatementContext) AddAffectedRows(rows uint64) {
sc.mu.Lock()
sc.mu.affectedRows += rows
sc.mu.Unlock()
}
// AffectedRows gets affected rows.
func (sc *StatementContext) AffectedRows() uint64 {
sc.mu.Lock()
rows := sc.mu.affectedRows
sc.mu.Unlock()
return rows
}
// FoundRows gets found rows.
func (sc *StatementContext) FoundRows() uint64 {
sc.mu.Lock()
rows := sc.mu.foundRows
sc.mu.Unlock()
return rows
}
// AddFoundRows adds found rows.
func (sc *StatementContext) AddFoundRows(rows uint64) {
sc.mu.Lock()
sc.mu.foundRows += rows
sc.mu.Unlock()
}
// GetWarnings gets warnings.
func (sc *StatementContext) GetWarnings() []SQLWarn {
sc.mu.Lock()
warns := make([]SQLWarn, len(sc.mu.warnings))
copy(warns, sc.mu.warnings)
sc.mu.Unlock()
return warns
}
// WarningCount gets warning count.
func (sc *StatementContext) WarningCount() uint16 {
if sc.InShowWarning {
return 0
}
sc.mu.Lock()
wc := uint16(len(sc.mu.warnings))
sc.mu.Unlock()
return wc
}
// SetWarnings sets warnings.
func (sc *StatementContext) SetWarnings(warns []SQLWarn) {
sc.mu.Lock()
sc.mu.warnings = warns
sc.mu.Unlock()
}
// AppendWarning appends a warning with level 'Warning'.
func (sc *StatementContext) AppendWarning(warn error) {
sc.mu.Lock()
if len(sc.mu.warnings) < math.MaxUint16 {
sc.mu.warnings = append(sc.mu.warnings, SQLWarn{WarnLevelWarning, warn})
}
sc.mu.Unlock()
}
// AppendNote appends a warning with level 'Note'.
func (sc *StatementContext) AppendNote(warn error) {
sc.mu.Lock()
if len(sc.mu.warnings) < math.MaxUint16 {
sc.mu.warnings = append(sc.mu.warnings, SQLWarn{WarnLevelNote, warn})
}
sc.mu.Unlock()
}
// SetHistogramsNotLoad sets histogramsNotLoad.
func (sc *StatementContext) SetHistogramsNotLoad() {
sc.mu.Lock()
sc.mu.histogramsNotLoad = true
sc.mu.Unlock()
}
// HistogramsNotLoad gets histogramsNotLoad.
func (sc *StatementContext) HistogramsNotLoad() bool {
sc.mu.Lock()
notLoad := sc.mu.histogramsNotLoad
sc.mu.Unlock()
return notLoad
}
// HandleTruncate ignores or returns the error based on the StatementContext state.
func (sc *StatementContext) HandleTruncate(err error) error {
// TODO: At present we have not checked whether the error can be ignored or treated as warning.
// We will do that later, and then append WarnDataTruncated instead of the error itself.
if err == nil {
return nil
}
if sc.IgnoreTruncate {
return nil
}
if sc.TruncateAsWarning {
sc.AppendWarning(err)
return nil
}
return err
}
// HandleOverflow treats ErrOverflow as warnings or returns the error based on the StmtCtx.OverflowAsWarning state.
func (sc *StatementContext) HandleOverflow(err error, warnErr error) error {
if err == nil {
return nil
}
if sc.OverflowAsWarning {
sc.AppendWarning(warnErr)
return nil
}
return err
}
// ResetForRetry resets the changed states during execution.
func (sc *StatementContext) ResetForRetry() {
sc.mu.Lock()
sc.mu.affectedRows = 0
sc.mu.foundRows = 0
sc.mu.warnings = nil
sc.mu.Unlock()
}
// MergeExecDetails merges a single region execution details into self, used to print
// the information in slow query log.
func (sc *StatementContext) MergeExecDetails(details *execdetails.ExecDetails) {
sc.mu.Lock()
sc.mu.execDetails.ProcessTime += details.ProcessTime
sc.mu.execDetails.WaitTime += details.WaitTime
sc.mu.execDetails.BackoffTime += details.BackoffTime
sc.mu.execDetails.RequestCount++
sc.mu.execDetails.TotalKeys += details.TotalKeys
sc.mu.execDetails.ProcessedKeys += details.ProcessedKeys
sc.mu.Unlock()
}
// GetExecDetails gets the execution details for the statement.
func (sc *StatementContext) GetExecDetails() execdetails.ExecDetails {
var details execdetails.ExecDetails
sc.mu.Lock()
details = sc.mu.execDetails
sc.mu.Unlock()
return details
}