新手发帖，关于参数索引越界，蛋疼//........
String sql="select * from tb_user where username=？and mypassword =?";



conn=ConnectionFactory.getConnection();
try {

psmt=conn.prepareStatement(sql);

psmt.setString(1, user.getUsername());

psmt.setString(2, user.getPassword());
执行到这里就会报错


java.sql.SQLException: Parameter index out of range (2 > number of parameters, which is 1).