new-server/app/config/db.go

package config

import (
	"fmt"
	_ "github.com/go-sql-driver/mysql"
	"github.com/jmoiron/sqlx"
	"sync"
)

var dbx *sqlx.DB
var dbLock sync.Mutex

func DBX() *sqlx.DB {
	dbLock.Lock()
	defer dbLock.Unlock()

	if dbx == nil {
		dbx = sqlx.MustConnect("mysql", fmt.Sprintf(
			"%s:%s@(%s:%d)/%s?parseTime=true",
			MySqlUsername(),
			MySQlPassword(),
			MySqlHost(),
			MySqlPort(),
			MySqlSchema(),
		))

		dbx.SetMaxIdleConns(20)
		dbx.SetMaxOpenConns(40)
		dbx.SetConnMaxLifetime(0)
	}

	return dbx
}