zyos_go_mq_consume/app/db/data_db.go

package db

import (
	"fmt"
	"os"
	"time"

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

	"applet/app/cfg"
)

var DataDb *xorm.Engine

//根据DB配置文件初始化数据库
func InitDataDB(c *cfg.DBCfg) error {
	var (
		err error
		f   *os.File
	)
	//创建Orm引擎
	if DataDb, err = xorm.NewEngine("mysql", fmt.Sprintf("%s:%s@tcp(%s)/%s?charset=utf8mb4", c.User, c.Psw, c.Host, c.Name)); err != nil {
		return err
	}
	DataDb.SetConnMaxLifetime(c.MaxLifetime * time.Second) //设置最长连接时间
	DataDb.SetMaxOpenConns(c.MaxOpenConns)                 //设置最大打开连接数
	DataDb.SetMaxIdleConns(c.MaxIdleConns)                 //设置连接池的空闲数大小
	if err = DataDb.Ping(); err != nil {                   //尝试ping数据库
		return err
	}
	if c.ShowLog { //根据配置文件设置日志
		DataDb.ShowSQL(true)        //设置是否打印sql
		DataDb.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 err
			}
		}
		logger := log.NewSimpleLogger(f)
		logger.ShowSQL(true)
		DataDb.SetLogger(logger)
	}
	return nil
}