Question

它给我提示：String sql="select * from member where user_name='"+name+"'"; 错误，我感觉没有错呀

Answer 1

你的语法是没有问题的；如果错误，应该是你的变量名，"sql","member","user_name","name"这四个你看看是否有拼写或者未定义之类的错误

Answer 2

select * from member where user_name='name'

Answer 3

提示什么错误？

Answer 4

name没定义麼？还是定义了没有符值？