egg_models/src/db_back.go

package db

import (
	"fmt"
	"os"

	_ "github.com/go-sql-driver/mysql" //必须导入mysql驱动，否则会panic
	"xorm.io/xorm"
	"xorm.io/xorm/log"
)

type BackUpDBCfg struct {
	Host    string `yaml:"host"`     //ip及端口
	Name    string `yaml:"name"`     //库名
	User    string `yaml:"user"`     //用户
	Psw     string `yaml:"psw"`      //密码
	ShowLog bool   `yaml:"show_log"` //是否显示SQL语句
	Path    string `yaml:"path"`     //日志文件存放路径
}

// 根据DB配置文件初始化数据库
func InitBackUpDB(c *BackUpDBCfg) (Db *xorm.Engine, err error) {
	fmt.Println("db host::::", fmt.Sprintf("%s:%s@tcp(%s)/%s?charset=utf8mb4", c.User, c.Psw, c.Host, c.Name))
	var (
		f *os.File
	)
	//创建Orm引擎
	if Db, err = xorm.NewEngine("mysql", fmt.Sprintf("%s:%s@tcp(%s)/%s?charset=utf8mb4", c.User, c.Psw, c.Host, c.Name)); err != nil {
		return
	}
	if err = Db.Ping(); err != nil { //尝试ping数据库
		return
	}
	if c.ShowLog { //根据配置文件设置日志
		Db.ShowSQL(true)        //设置是否打印sql
		Db.Logger().SetLevel(0) //设置日志等级
		//修改日志文件存放路径文件名是%s.log
		path := fmt.Sprintf(c.Path, c.Name)
		f, err = os.OpenFile(path, os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0777)
		if err != nil {
			os.RemoveAll(c.Path)
			if f, err = os.OpenFile(c.Path, os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0777); err != nil {
				return
			}
		}
		logger := log.NewSimpleLogger(f)
		logger.ShowSQL(true)
		Db.SetLogger(logger)
	}
	return
}