java+sql2005 隨機抽取試題的代碼

2020-03-24 16:56:04

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來源：轉載

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復制代碼代碼如下:
import java.awt.BorderLayout;
import java.util.*;
import java.awt.event.*;
import java.awt.Container;
import java.awt.EventQueue;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
html' target='_blank'>public class Test extends JFrame {
public static final String DBDRIVER="com.microsoft.sqlserver.jdbc.SQLServerDriver";
public static final String DBURL="jdbc:sqlserver://localhost:1433;DatabaseName=SystemTest;SelectMethod=Cursor";
public static final String DBUSER="sa";
public static final String DBPASSWORD="123";
public static Connection conn=null;
public static Statement stmt=null;
public static Statement stmt1=null;
public static Statement stmt2=null;
public static ResultSet rs=null;
public static ResultSet rs1=null;
public static void main(String args[]) {
try{
//數據庫的連接。
Class.forName(DBDRIVER);
conn=DriverManager.getConnection(DBURL,DBUSER,DBPASSWORD);
stmt= conn.createStatement(ResultSet. TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);
stmt1= conn.createStatement(ResultSet. TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);
stmt2= conn.createStatement(ResultSet. TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);
}catch(Exception e)
{
e.printStackTrace();
}
Test t1=new Test();
t1.sel_save();
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Test frame = new Test();
frame.setVisible(true);
frame.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e)
{
System.exit(0);
/*try{
sql_1="delete from stu_selAns";
stmt=conn.createStatement();
rs=stmt.executeQuery(sql_1);
}
catch(Exception event)
{
}*/
}
});
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame
*/
public Test() {
super();
setBounds(100, 100, 500, 386);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setTitle("測試");
final Container container = new Container();
container.setLayout(null);
getContentPane().add(container, BorderLayout.CENTER);
label = new JLabel();
label.setBounds(22, 68, 462, 57);
container.add(label);
final JButton nextButton = new JButton();
nextButton.setText("next");
nextButton.setBounds(60, 270, 106, 28);
container.add(nextButton);
nextButton.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent event)
{
int current=Integer.parseInt(label_3.getText());
current+=1;
if(current 0 =10)
{
label_3.setText(""+current);
label_3.setVisible(true);
sel_show(current);
}
label_2.setVisible(false);
label_1.setVisible(false);
}
});
button = new JButton();
button.setText("顯示答案");
button.setBounds(224, 270, 106, 28);
container.add(button);
button.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent event)
{
label_1.setVisible(true);
label_2.setVisible(true);
int current=Integer.parseInt(label_3.getText());
current+=1;
try{
sql="select sel_Ans from stu_selAns where sel_Id="+current;
stmt=conn.createStatement();
rs=stmt.executeQuery(sql);
while(rs.next())
{
label_2.setText(rs.getString(1));
}
}catch(Exception e)
{
}
}
});
label_1 = new JLabel();
label_1.setText("正確答案是：");
label_1.setBounds(22, 199, 78, 28);
container.add(label_1);
label_1.setVisible(false);
label_2 = new JLabel();
label_2.setBounds(106, 199, 323, 28);
container.add(label_2);
label_2.setVisible(false);
button_1 = new JButton();
button_1.setText("退出");
button_1.setBounds(349, 270, 106, 28);
container.add(button_1);
button_1.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent event)
{
dispose();
/*try{
sql_1="delete from stu_selAns";
stmt=conn.createStatement();
rs=stmt.executeQuery(sql_1);
}catch(Exception e)
{
e.printStackTrace();
}*/
}
});
label_3 = new JLabel();
label_3.setBounds(363, 175, 66, 18);
container.add(label_3);
label_3.setVisible(false);
label_3.setText("0");
}
//此方法用于獲取選擇題的數目。
public int sel_count()
{
int n = 0;
try{
Connection conn=null;
Statement stmt=null;
ResultSet rs=null;
Class.forName(DBDRIVER);
conn=DriverManager.getConnection(DBURL,DBUSER,DBPASSWORD);
sql_1="select COUNT(selId) from sel_test where selId=1";
stmt=conn.createStatement();
rs=stmt.executeQuery(sql_1);
if(rs.next())
{
n=rs.getInt(1);
}
}
catch(Exception e )
{
e.printStackTrace();
}
return n;
}
//此方法用于產生十道選擇題的隨機數。
public int[] Random()
{
Test st=new Test();
int n=st.sel_count();
int[] numbers=new int[n];
for(int i=0;i numbers.length;i++)
numbers[i]=i+1;
int[] result=new int[10];
for(int i=0;i result.length;i++)
{
int r=(int)(Math.random()*n);
result[i]=numbers[r];
numbers[r]=numbers[n-1];
n--;
}
return result;
}
//此方法實現存取隨機抽取的選擇題
public void sel_save()
{
Test s=new Test();
int k[]=s.Random();
Arrays.sort(k);
for(int i=0;i k.length;i++)
{
System.out.println(k[i]);
try{
sql_2="select selNo,selInf,selA,selB,selC,selD,selAns from sel_test where selNo="+k[i];
sql=" insert into stu_selAns(sel_No,sel_Inf,sel_A,sel_B,sel_C,sel_D,sel_Ans)"+sql_2;
stmt=conn.createStatement();
stmt1=conn.createStatement();
rs=stmt1.executeQuery(sql);
while(rs.next())
{
stmt1.execute(sql);
}
}catch(Exception e)
{
e.printStackTrace();
}
}
//此處的FOR循環實現將試題的題號從一到十進行排列。
for(int j=0;j k.length;j++)
{
//System.out.println(k[j]+"a");//用于測試產生的隨機數是否相同。
try{
sql="update stu_selAns set sel_Id="+(j+1)+"where sel_No="+k[j];
stmt=conn.createStatement();
rs=stmt.executeQuery(sql);
}catch(Exception e)
{
e.printStackTrace();
}
}
}
//此方法實現選擇題的調用
public void sel_show(int i)
{
try{
sql="select sel_Inf ,sel_Ans from stu_selAns where sel_No="+i;
stmt=conn.createStatement();
rs=stmt.executeQuery(sql);
while(rs.next())
{
label.setText(rs.getString(1));
label_2.setText(rs.getString("sel_Ans"));
}
}catch(Exception e)
{
e.printStackTrace();
}
}
private String sql;
public static String sql_1;
private String sql_2;
private JLabel label;
private JLabel label_1;
private JLabel label_2;
private JLabel label_3;
private JButton button; //顯示答案的按鈕。
private JButton button_1;
}
說明：執行此程序前需先建立兩張表。其中一張表是(sel_test(selNo,selA,selB,selC,selD,selAns)),另一張表是(stu_selAns(sel_No,sel_A,sel_B,sel_C,sel_D,sel_Ans) 此張表用于保存從表sel_test

中隨機抽取的題目。
此程序是大概思路是：先從題庫中隨機抽取十道題，然后將其保存在另一張表中并將其相應的題號變為一到十。便于接下來的其他操作。html教程

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