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conn.go
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conn.go
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// Copyright 2013 The ql Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSES/QL-LICENSE file.
// Copyright 2015 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 session
import (
"fmt"
// "math"
// "strings"
"database/sql"
"time"
// "github.com/hanchuanchuan/goInception/ast"
// "github.com/hanchuanchuan/goInception/expression"
// "github.com/hanchuanchuan/goInception/mysql"
// "github.com/hanchuanchuan/goInception/sessionctx/stmtctx"
mysqlDriver "github.com/go-sql-driver/mysql"
"github.com/jinzhu/gorm"
log "github.com/sirupsen/logrus"
)
const maxBadConnRetries = 2
// createNewConnection 用来创建新的连接
// 注意: 该方法可能导致driver: bad connection异常
func (s *session) createNewConnection(dbName string) {
addr := fmt.Sprintf("%s:%s@tcp(%s:%d)/%s?charset=utf8mb4&parseTime=True&loc=Local&maxAllowedPacket=%d",
s.opt.user, s.opt.password, s.opt.host, s.opt.port,
dbName, s.Inc.MaxAllowedPacket)
db, err := gorm.Open("mysql", addr)
if err != nil {
// log.Error(err)
log.Errorf("con:%d %v", s.sessionVars.ConnectionID, err)
s.AppendErrorMessage(err.Error())
return
}
if s.db != nil {
s.db.Close()
}
// 禁用日志记录器,不显示任何日志
db.LogMode(false)
// 为保证连接成功关闭,此处等待10ms
time.Sleep(10 * time.Millisecond)
s.db = db
}
// Raw 执行sql语句,连接失败时自动重连,自动重置当前数据库
func (s *session) Raw(sqlStr string) (rows *sql.Rows, err error) {
// 连接断开无效时,自动重试
for i := 0; i < maxBadConnRetries; i++ {
rows, err = s.db.DB().Query(sqlStr)
if err == nil {
return
} else {
// log.Error(err)
log.Errorf("con:%d %v", s.sessionVars.ConnectionID, err)
if err == mysqlDriver.ErrInvalidConn {
err1 := s.initConnection()
if err1 != nil {
return rows, err1
}
s.AppendErrorMessage(mysqlDriver.ErrInvalidConn.Error())
continue
} else {
return
}
}
}
return
}
// Raw 执行sql语句,连接失败时自动重连,自动重置当前数据库
func (s *session) Exec(sqlStr string, retry bool) (res sql.Result, err error) {
// 连接断开无效时,自动重试
for i := 0; i < maxBadConnRetries; i++ {
res, err = s.db.DB().Exec(sqlStr)
if err == nil {
return
} else {
// log.Error(err)
log.Errorf("con:%d %v", s.sessionVars.ConnectionID, err)
if err == mysqlDriver.ErrInvalidConn {
err1 := s.initConnection()
if err1 != nil {
return res, err1
}
if retry {
s.AppendErrorMessage(mysqlDriver.ErrInvalidConn.Error())
continue
} else {
return
}
}
return
}
}
return
}
// Raw 执行sql语句,连接失败时自动重连,自动重置当前数据库
func (s *session) RawScan(sqlStr string, dest interface{}) (err error) {
// 连接断开无效时,自动重试
for i := 0; i < maxBadConnRetries; i++ {
err = s.db.Raw(sqlStr).Scan(dest).Error
if err == nil {
return
} else {
if err == mysqlDriver.ErrInvalidConn {
// log.Error(err)
log.Errorf("con:%d %v", s.sessionVars.ConnectionID, err)
err1 := s.initConnection()
if err1 != nil {
return err1
}
s.AppendErrorMessage(mysqlDriver.ErrInvalidConn.Error())
continue
} else {
return
}
}
}
return
}
// initConnection 连接失败时自动重连,重连后重置当前数据库
func (s *session) initConnection() (err error) {
name := s.DBName
if name == "" {
name = "mysql"
}
// 连接断开无效时,自动重试
for i := 0; i < maxBadConnRetries; i++ {
if err = s.db.Exec(fmt.Sprintf("USE `%s`", name)).Error; err == nil {
// 连接重连时,清除线程ID缓存
// s.threadID = 0
log.Infof("con:%d 数据库断开重连", s.sessionVars.ConnectionID)
return
} else {
// log.Error(err)
log.Errorf("con:%d %v", s.sessionVars.ConnectionID, err)
if err != mysqlDriver.ErrInvalidConn {
if myErr, ok := err.(*mysqlDriver.MySQLError); ok {
s.AppendErrorMessage(myErr.Message)
} else {
s.AppendErrorMessage(err.Error())
}
return
}
}
}
if err != nil {
// log.Error(err)
log.Errorf("con:%d %v", s.sessionVars.ConnectionID, err)
if myErr, ok := err.(*mysqlDriver.MySQLError); ok {
s.AppendErrorMessage(myErr.Message)
} else {
s.AppendErrorMessage(err.Error())
}
}
return
}