与本地MySQL服务器的连接成功与错误的连接细节？

I use MySQL within my application and I just tried to connect to my local MySQL server. First I tried to connect using the right connection details (localhost, user: root, no password). It succeeds. Then I tried to connect using the wrong connection details (localhost, user: root1, password: 123). It failed. But if i leave the password blank then it succeeds? I dont know why but everytime i leave the password blank and only provide a username (whatever username you can imagine) it succeeds! Can anyone help me with this crazy error? Dont know why the server doesn't reject my connection attempt.I use MySQL within my application and I just tr