Java从数据库中选择在哪里条件

Question

我有问题。在我的方法中

public void selectUser(String name, String surname) 

我尝试登录用户。 Inialize您PreparedStatement对象

String sql = "select * from user where surname= (here my surname from method parameter) and name= (name from method parameter) "; 

Answer 1

PreparedStatement pst = null; 
pst = c.prepareStatement("select * from user where surname= ? and name= ? "); 
      pst.setString(1, getterMethodHere); 
      pst.setString(2, getterMethodHere); 

1,2代表surname= ? and name= ?符号分别

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Answer 2

圣Krish感谢：我怎么可以准备一个SQL statment赞一个。现在如何使用rs.next，因为我不明白prepareStatemnt。

下面的代码

enter code here 



     //stat = con.createStatement(); 
     //String sql = "select * from user where surname= "+surname+" and name="+name; 
     PreparedStatement pst = null; 
     pst = con.prepareStatement("select * from user where surname= ? and name= ? "); 
     pst.setString(1, name); 
     pst.setString(2, surname); 
     ResultSet rs = pst.executeQuery(); 



     while (rs.next()) { 
      //get from column name 

      String id = rs.getString("id"); 
      String login = rs.getString("login"); 
      String password = rs.getString("password"); 

      //print 

      System.out.print(" id: " + id); 
      System.out.print(", login: " + login); 
      System.out.println(", pass: " + password); 
     } 

和如何返回ID？