Java從數據庫中選擇在哪裏條件

Question

我有問題。在我的方法中

public void selectUser(String name, String surname) 

我嘗試登錄用戶。 Inialize您PreparedStatement對象

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= ?符號分別

Learn More . .

Answer 2

聖Krish感謝：我怎麼可以準備一個SQL statment贊一個。現在如何使用rs.next，因爲我不明白prepareStatemnt。

下面的代碼

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？