@echo off

set "Ymd=%date:~,4%%date:~5,2%%date:~8,2%"
c:
cd C:\MySQL\bin\
mysqldump -h 172.25.66.80 -u root -p1234567 TestDB > D:\db_backup\TestDB_%Ymd%.sql

@echo on

注意当前计算机日期的格式，尽量使2000-01-01格式，不要包含”/“