LAPP_MY_BACKEND/db/db.go

package db

import (
	"context"
	"fmt"
	_ "github.com/go-sql-driver/mysql"
	"github.com/go-xorm/xorm"
	"go.mongodb.org/mongo-driver/mongo"
	"go.mongodb.org/mongo-driver/mongo/options"
	"lapp_-wy/conf"
	"lapp_-wy/utils"
	"lapp_-wy/web/middleware/glog"
	"log"
	"path/filepath"
	"sync"
	"time"
)

var (
	masterEngine *xorm.Engine
	Lock         sync.Mutex
	mgoDb        *mongo.Client
	mlock        sync.Mutex
)

//链接到数据库
func MasterEngine() *xorm.Engine {
	//判断masterEngine是否存在
	if masterEngine != nil {
		return masterEngine
	}
	//创建之前会涉及并发，所以要加锁
	Lock.Lock()
	defer Lock.Unlock()
	//细节，防止多个请求锁住
	if masterEngine != nil {
		return masterEngine
	}
	c := conf.MasterDbConfig
	driveSource := fmt.Sprintf("%s:%s@tcp(%s:%d)/%s?charset=utf8",
		c.User, c.Pwd, c.Host, c.Port, c.DbName)
	engine, err := xorm.NewEngine(conf.DriverName, driveSource)
	//开启sql，debug
	//engine.ShowSQL(true)
	if err != nil {
		log.Fatal("dbhelper.DbinstanceMaster error= ", err)
		return nil
	} else {
		masterEngine = engine
		return masterEngine
	}
	return masterEngine
}

//创建mongoDb数据库链接
func MgoDb() *mongo.Client {
	//判断mgoDb是否存在
	if mgoDb != nil {
		return mgoDb
	}
	//创建之前会涉及并发，所以要加锁
	mlock.Lock()
	defer mlock.Unlock()
	//细节，防止多个请求锁住
	if mgoDb != nil {
		return mgoDb
	}
	//1.建立链接
	ctx, _ := context.WithTimeout(context.Background(), 10*time.Second)
	client, err := mongo.Connect(ctx, options.Client().ApplyURI("mongodb://localhost:27017"))
	if err != nil {
		log.Fatal("dbhelper.MgoDb error= ", err)
		return nil
	} else {
		mgoDb = client
		return mgoDb
	}
}


//数据备份
func BackUp() {
	var (
		engine *xorm.Engine
		err    error
	)

	c := conf.MasterDbConfig

	driveSource := fmt.Sprintf("%s:%s@tcp(%s:%d)/%s?charset=utf8",
		c.User, c.Pwd, c.Host, c.Port, c.DbName)
	if engine, err = xorm.NewEngine(conf.DriverName, driveSource); err != nil {
		return
	}
	if err = engine.Ping(); err != nil {
		glog.ErrorExtln("数据库连接失败:", "err:", err.Error())
		return
	} else {
		glog.ErrorExtln("数据库连接成功：", "driveSource", driveSource)
	}
	filename := utils.TimeFormat(time.Now(),"yyyy-MM-dd") + ".sql"
	dirpath := filepath.Join(c.BackUp,filename)
	err = engine.DumpAllToFile(dirpath, conf.DriverName)
	if err != nil {
		return
	}

}