無法從我的sql檢索數據到Java eclipse

Question

我無法從mysql檢索數據到java eclipse控制檯。我如何檢索並顯示來自mysql的數據。

DB TABLE列是：Student_ID | Student_FirstName | Student_LastName | Student_EmailID | Student_Course

這裏是代碼如下：

package jdbcdemo; 
import java.sql.Connection; 
import java.sql.DriverManager; 
import java.util.Scanner; 
import java.sql.ResultSet; 
import com.mysql.jdbc.Statement; 

public class StudentDetail { 

    public static void studentinfo() { 

     System.out.println("Enter the stdentid to view details"); 

     Scanner studentid= new Scanner(System.in); 
     int stdnumber = studentid.nextInt(); 
     studentid.nextLine(); 

     //Connection to db 
     try{ 
     Connection conn = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/student_db","root","admin"); 
     Statement stmt = (Statement) conn.createStatement(); 
     String details = "SELECT * FROM `student_db`.`studentinfo` WHERE `Student_ID`='"+stdnumber+"'"; 
     ResultSet rs= stmt.executeQuery(details); 

     }catch (Exception e){ 
      System.err.println(e); 
     } 

    } 

} 

輸出：沒有錯誤顯示，並且「EXIT」被顯示作爲輸出。

Answer 1

查詢完表格後（您已完成），需要從ResultSet中提取數據。例如：

ResultSet rs= stmt.executeQuery(details); 
while (rs.next()) { 
     System.out.println ("Student ID: " + rs.getString(1); 
     System.out.println ("Student name: " + rs.getString(2); 
}