forfiles /p "F:\db_backup" /s /m *.* /d -7 /c "cmd /c del @path"
rem *******************************Code Start*****************************
@echo off

set "Ymd=%date:~,4%%date:~5,2%%date:~8,2%"
mysql10.3.10\bin\mysqldump --opt -u 用户名 --password=密码 数据库名> F:\db_backup\数据库名_%Ymd%.sql
@echo on
rem *******************************Code End*****************************