如何獲得SQL

Question

例如specefic行或列的數據

id name surname 
0 Alex A 
1 Mark B 
2 Bill C 

讓我們假設我想其中id等於在Java中1名和姓，我怎麼能得到各列的值

Answer 1

使用Statement或PreparedStatement，你可以檢索字段下面提供你應該已經包括JDBC庫項目中的

try{ 
    Class.forName("com.mysql.jdbc.Driver"); // loading driver class 
    Connection cn = DriverManager.getConnection("jdbc:mysql://localhost:3306/Database_name", username,password); // getting connection may change depending on database you are using 
    PreparedStatement ps = cn.prepareStatement("select name,sirname from user where id = ?"); 

       ps.setString(1,id); 

      ResultSet rs = ps.executeQuery(); 
       int i=0; 
       while(rs.next()) 
       { 
        String name = rs.getString("name"); 
        // retrieve your fields 
       } 

}catch(Exception e) 
{ 
    e.printStackTrace(); 
}