String name = request.getParameter("username");
ResultSet rs = st.executeQuery("select count(*) from user where name = " + name); name的格式怎么写,老是出错,谢谢了!
ResultSet rs = st.executeQuery("select count(*) from user where name = " + name); name的格式怎么写,老是出错,谢谢了!
string sql="select count(*) from user where name = " + name;
ResultSet rs = st.executeQuery(sql);
像这样写试看
ResultSet rs = st.executeQuery(sql);