在线考试系统

[java]代码库

package com.lzy.sql;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.swing.JOptionPane;

import com.lzy.adm.Adm_1;
import com.lzy.adm.Adm_5;
import com.lzy.stuExam.StuExam;
import com.lzy.stuExam.StuThread;

public class GetSQL {
	static Connection ct;
	static PreparedStatement ps;
	static ResultSet rs;
	public static String name;
	public static String pwd;
	public static boolean k;
	public static String num;
	public static String question;
	public static String A;
	public static String B;
	public static String C;
	public static String D;
	public static String answers;
	public static int maxrow;
	public static int j=0;
	public static String [] answersArray;
	
	//连接数据库
	public static void connectSQL(){
		try {
			ct=DriverManager.getConnection("jdbc:sqlserver://localhost:1433;DatabaseName=exam_db", "sa", "1234");
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	//查找用户，密码（管理员）
	public static void adm(String s){
		try {
			ps=ct.prepareStatement("select * from adm where 管理员=?");
			ps.setString(1, s);
			rs=ps.executeQuery();
			if(rs.next()){
				pwd=rs.getString(2);
			}else {
				JOptionPane.showMessageDialog(null, "没有此用户，请重新输入！");
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
	}
	
	//查找用户，密码（学生）
	public static void stu(String s){
		try {
			ps=ct.prepareStatement("select * from stu where 学号=?");
			ps.setString(1, s);
			rs=ps.executeQuery();
			if(rs.next()){
				pwd=rs.getString(2);
			}else {
				JOptionPane.showMessageDialog(null, "没有此用户，请重新输入！");
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
	}
	
	//查看信息
	public static void qadm_1(){
		int s=0;
		try {
			ps=ct.prepareStatement("select * from stu");
			rs=ps.executeQuery();
			while(rs.next()){
				name=rs.getString(1);
				pwd=rs.getString(2);
				Adm_1.prit(s);
				s++;
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	//学号重复
	public static  void qadm_2(String s){
		try {
			ps=ct.prepareStatement("select * from stu where 学号 =?");
			ps.setString(1, s);
			rs=ps.executeQuery();
			if(rs.next()){
				JOptionPane.showMessageDialog(null, "学号重复，请重新输入!");
				k=false;
			}else{
				k=true;
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	//添加信息
	public static void qadm_2(String s1,String s2){
		try {
			ps=ct.prepareStatement("insert into stu values(?,?)");
			ps.setString(1, s1);
			ps.setString(2, s2);
			int m=ps.executeUpdate();
			if(m!=0){
				JOptionPane.showMessageDialog(null, "添加成功");
			}else {
				JOptionPane.showMessageDialog(null, "添加失败");
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	//学号不存在
	public static void qadm_3(String s){
		try {
			ps=ct.prepareStatement("select * from stu where 学号 =?");
			ps.setString(1, s);
			rs=ps.executeQuery();
			if(rs.next()){
				k=true;
			}else{
				JOptionPane.showMessageDialog(null, "学号不存在");
				k=false;
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	//修改信息
	public static void qadm_3(String s1, String s2){
		// TODO Auto-generated method stub
		try {
			ps=ct.prepareStatement("update stu set 密码 = ? where 学号 =?");
			ps.setString(1, s2);
			ps.setString(2, s1);
			int m=ps.executeUpdate();
			if(m!=0){
				JOptionPane.showMessageDialog(null, "修改成功");
			}else {
				JOptionPane.showMessageDialog(null, "修改失败，请重新输入");
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	//删除信息
	public static void qadm_4(String s) {
		try {
			ps=ct.prepareStatement("delete from stu  where 学号=?");
			ps.setString(1, s);
			int m=ps.executeUpdate();
			if(m!=0){
				JOptionPane.showMessageDialog(null, "删除成功");
			}else {
				JOptionPane.showMessageDialog(null, "删除失败");
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	//查看试题
	public static void qadm_5(){
		int s=0;
		try {
			ps=ct.prepareStatement("select * from question");
			rs=ps.executeQuery();
			while(rs.next()){
				num=rs.getString(1);
				question=rs.getString(2);
				A=rs.getString(3);
				B=rs.getString(4);
				C=rs.getString(5);
				D=rs.getString(6);
				answers=rs.getString(7);
				Adm_5.prit(s);
				s++;
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	//试题号是否重复
	public static  void qadm_6(String s){
		try {
			ps=ct.prepareStatement("select * from question where 试题序号 =?");
			ps.setString(1, s);
			rs=ps.executeQuery();
			if(rs.next()){
				JOptionPane.showMessageDialog(null, "学号重复，请重新输入!");
				k=false;
			}else{
				k=true;
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	//添加试题
	public static void qadm_6(String s1,String s2,String s3,String s4,String s5,String s6,String s7){
		try {
			ps=ct.prepareStatement("insert into question values(?,?,?,?,?,?,?)");
			ps.setString(1, s1);
			ps.setString(2, s2);
			ps.setString(3, s3);
			ps.setString(4, s4);
			ps.setString(5, s5);
			ps.setString(6, s6);
			ps.setString(7, s7);
			int m=ps.executeUpdate();
			if(m!=0){
				JOptionPane.showMessageDialog(null, "添加成功");
			}else {
				JOptionPane.showMessageDialog(null, "添加失败");
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	//试题号是否存在
	public static void qadm_7(String s){
		try {
			ps=ct.prepareStatement("select * from question where 试题序号 =?");
			ps.setString(1, s);
			rs=ps.executeQuery();
			if(rs.next()){
				k=true;
			}else{
				JOptionPane.showMessageDialog(null, "试题序号不存在");
				k=false;
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	//修改试题
	public static void qadm_7(String s1,String s2,String s3,String s4){//试题序号，修改属性，修改内容，正确答案
		try {
			ps=ct.prepareStatement("update question  set "+s2+" = ? ,正确答案=? where 试题序号=?");
			ps.setString(1, s3);
			ps.setString(2, s4);
			ps.setString(3, s1);
			int m=ps.executeUpdate();
			if(m!=0){
				JOptionPane.showMessageDialog(null, "修改成功", "提示消息", JOptionPane.WARNING_MESSAGE);
			}else {
				JOptionPane.showMessageDialog(null, "修改失败，请重新输入", "提示消息", JOptionPane.WARNING_MESSAGE);
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	//删除试题
	public static void qadm_8(String s) {
		try {
			ps=ct.prepareStatement("delete from question  where 试题序号=?");
			ps.setString(1, s);
			int m=ps.executeUpdate();
			if(m!=0){
				JOptionPane.showMessageDialog(null, "删除成功");
			}else {
				JOptionPane.showMessageDialog(null, "删除失败");
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	//考生修改密码
	public static void stu_1(String s1, String s2, String s3, String s4) {
		// TODO Auto-generated method stub
		try {
			ps=ct.prepareStatement("select * from stu  where 学号 =? and 密码=?");
			ps.setString(1, s1);
			ps.setString(2, s2);
			rs=ps.executeQuery();
			if(rs.next()){
				k=true;
			}else{
				JOptionPane.showMessageDialog(null, "原始密码错误，请重新输入", "提示消息", JOptionPane.WARNING_MESSAGE);
				k=false;
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		if(k){
			if(s3.equals(s4)){
				try {
					ps=ct.prepareStatement("update stu  set 密码 = ? where 学号 =?");
					ps.setString(1, s3);
					ps.setString(2, s1);
					int m=ps.executeUpdate();
					if(m!=0){
						JOptionPane.showMessageDialog(null, "修改成功");
					}else {
						JOptionPane.showMessageDialog(null, "修改失败，请重新输入");
					}
				} catch (SQLException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}else {
				JOptionPane.showMessageDialog(null, "新密码输入不一致，请重新输入");
			}
		}
	}
	
	//获取试题最大行数
	public static void getMaxRow(){
		try {
			ps=ct.prepareStatement("select * from question");
			rs=ps.executeQuery();
			while(rs.next()){
				maxrow=rs.getRow();
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	//记录正确答案
	public static void readAnswers(){
		getMaxRow();
		answersArray=new String[maxrow];
		try {
			ps=ct.prepareStatement("select * from question");
			rs=ps.executeQuery();
			while(rs.next()){
				answersArray[j]=rs.getString(7).trim();
				j++;
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	//读取试题
	public static void read(int s){
		try {
			ps=ct.prepareStatement("select * from question where 试题序号=?");
			ps.setInt(1, s);
			rs=ps.executeQuery();
			if(rs.next()){
				num=rs.getString(1);
				question=rs.getString(2);
				A=rs.getString(3);
				B=rs.getString(4);
				C=rs.getString(5);
				D=rs.getString(6);
				StuThread.print();
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}

	
}