java对数据库的表插入操作时，显示已生成用于更新的结果集

package chang;                                                 //    一个插入操作在两行 * 号之间 应该是插入有问题   不知道问题出在哪，其他删除，更新都可以实现。求教。。

import java.sql.*;
import java.io.*;

public class cha
 {
 public static void xianlu()
 {
 System.out.println("线路号"+"\t"+ "出发地"+"\t"+"目的地"+"\t"+"出发时间"+"\t"+"所需时间");
 }
 public static void qiche()
 {
 System.out.println("汽车编号"+"\t"+"汽车种类"+"\t"+"最大载客量"+"\t"+"线路号");
 }
 public static void gg()
 {
 System.out.println("公告编号"+"\t公告内容"+"\t公告时间"+"\t通知人");
 }
 public static void hy()
 {
 System.out.println("会议编号"+"会议内容"+"\t会议时间"+"\t参会人"+"\t\t记录人");
 }
 
 public static void main(String[]args) throws SQLException
 {
 
 Connection con = null;
 Statement stmt = null;
 
 String url = "jdbc:sqlserver://localhost:1433;DatabaseName=changtuqiche";
 
 try {
 // 连接数据库
 con = DriverManager.getConnection(url, "sa", "1");
 // 建立Statement对象
 stmt = con.createStatement();
 /**
 * Statement createStatement() 创建一个 Statement 对象来将 SQL 语句发送到数据库。
 */
 // 执行数据库查询语句
 
 int z=1;
 while(z!=0)
 {
 System.out.println("1.查询2.插入3.更新4.删除");
 System.out.println("请选择：");
 int x=0;
 try
 {
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 x=Integer.parseInt(br.readLine());
 }catch(IOException ex){}
 if(x==5)  z=0;
 if(x==1)
 {
 System.out.println("1.线路信息查询2.汽车信息查询3.车票信息查询");
 System.out.println("请选择：");
 int i=0;
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 i=Integer.parseInt(br.readLine());
 }catch(IOException ex){}
 if(i==1)
 {
 @SuppressWarnings("null")
 ResultSet rs1=stmt.executeQuery("select 线路号,出发地,目的地,出发时间,所需时间  from 线路信息表");
 xianlu();
 while(rs1.next())
 {
 String a=rs1.getString("线路号");
 String b=rs1.getString("出发地");
 String c=rs1.getString("目的地");
 String d=rs1.getString("出发时间");
 int e1=rs1.getInt("所需时间");
 System.out.println(a+b+"\t"+c+"\t"+d+"\t"+e1);
 
 }
 rs1.close();
 }
 if(i==2)
 {
 @SuppressWarnings("null")
 ResultSet rs=stmt.executeQuery("select 汽车编号,汽车种类,最大载客量,线路号  from 汽车基本信息表");
 qiche();
 while(rs.next())
 {
 String a=rs.getString("汽车编号"); 
 String b=rs.getString("汽车种类");
 int c=rs.getInt("最大载客量");
 String d=rs.getString("线路号");
 
 System.out.println(a+"\t\t"+b+"\t\t"+c+"\t"+d);
 
 }
 rs.close();
 }
 if(i==3)
 {
 @SuppressWarnings("null")
 ResultSet rs=stmt.executeQuery("select 车票编号,售票情况,售价,线路号 from 车票信息表");
 chepiao();
 while(rs.next())
 {
 int a=rs.getInt("车票编号");
 String b=rs.getString("售票情况");
 int c=rs.getInt("售价");
 String d=rs.getString("线路号");
 System.out.println(a+"\t"+b+"\t"+c+"\t"+d);
 
 }
 rs.close();
 }
 if(i==4)
 {
 @SuppressWarnings("null")
 ResultSet rs=stmt.executeQuery("select 汽车编号,出发地,目的地,线路号，出发时间 from 乘客信息表");
 chengke();
 while(rs.next())
 {
 int a=rs.getInt("汽车编号");
 String b=rs.getString("出发地");
 int c=rs.getInt("目的地");
 String d=rs.getString("线路号");
 String e=rs.getString("出发时间 ");
 System.out.println(a+"\t"+b+"\t"+c+"\t"+d+"\t"+e);
 
 }
 rs.close();
 }
 
 }
 if(x==2)                                 /**********************************************************************/
 {
 
 System.out.println("1.线路信息插入 2.汽车信息插入 3.车票信息插入 4.乘客信息插入");
 System.out.println("请选择：");
 int m=0;
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 m=Integer.parseInt(br.readLine());
 }catch(IOException ex){}
 if(m==1){
 String c1="",c2="",c3="",c4="",c5="";
 
 //PreparedStatement pstmt1=con.prepareStatement("select * from Communication where Uname=?");
 //pstmt1.setString(1,c1);
 //ResultSet rs2=pstmt1.executeQuery();
 System.out.println("输入你要插入的线路号：");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 c1=br.readLine();
 }catch(IOException ex){}
 System.out.println("c1="+c1);
 System.out.println("输入你要插入的出发地：");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 c2=br.readLine();
 }catch(IOException ex){}
 System.out.println("c2="+c2);
 System.out.println("输入你要插入的目的地：");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 c3=br.readLine();
 }catch(IOException ex){}
 System.out.println("c3="+c3);
 System.out.println("输入你要插入的出发时间：");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 c4=br.readLine();
 }catch(IOException ex){}
 System.out.println("c4="+c4);
 System.out.println("输入你要插入的所需时间：");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 c5=br.readLine();
 }catch(IOException ex){}
 System.out.println("c5="+c5);
 PreparedStatement pstmt2=con.prepareStatement("insert into 线路信息表 (线路号,出发地,目的地,出发时间,所需时间)"+" values(?,?,?,?,?)");
 pstmt2.setString(1,c1);
 pstmt2.setString(2,c2);
 pstmt2.setString(3,c3);
 pstmt2.setString(4,c4);
 pstmt2.setString(5,c5);
 //pstmt2.executeQuery();
 
 pstmt2.executeUpdate();
 System.out.println("插入成功!"); 
 pstmt2.close(); 
 //pstmt1.close();
 //rs2.close();
 }                                                   /*********************************************************************/
 if(m==2){
 String c1="",c2="",c3="",c4="";
 //PreparedStatement pstmt1=con.prepareStatement("select * from Memo where Uname=?");
 //pstmt1.setString(1,c1);
 //ResultSet rs2=pstmt1.executeQuery();
 System.out.println("输入你要插入的汽车编号：");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 c1=br.readLine();
 }catch(IOException ex){}
 System.out.println("c1="+c1);
 System.out.println("输入你要插入的汽车：");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 c2=br.readLine();
 }catch(IOException ex){}
 System.out.println("c2="+c2);
 System.out.println("输入你要插入的最大载客量：");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 c3=br.readLine();
 }catch(IOException ex){}
 System.out.println("c3="+c3);
 //ResultSet rs2=pstmt1.executeQuery();
 System.out.println("输入你要插入的线路号：");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 c4=br.readLine();
 }catch(IOException ex){}
 System.out.println("c4="+c4);
 
 PreparedStatement pstmt2=con.prepareStatement("insert into 汽车基本信息表 values(?,?,?,?)");
 pstmt2.setString(1,c1);
 pstmt2.setString(2,c2);
 pstmt2.setString(3,c3);
 pstmt2.setString(4,c4);
 
 pstmt2.executeUpdate();
 System.out.println("插入成功!");
 pstmt2.close();
 //pstmt1.close();
 //rs2.close();
 }
 if(m==3){
 String c1="",c2="",c3="",c4="";
 //PreparedStatement pstmt1=con.prepareStatement("select * from Diary where Uname=?");
 //pstmt1.setString(1,c1);
 //ResultSet rs2=pstmt1.executeQuery();
 System.out.println("输入新的车票编号：");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 c1=br.readLine();
 }catch(IOException ex){}
 System.out.println("c1="+c1);
 System.out.println("输入售票情况：");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 c2=br.readLine();
 }catch(IOException ex){}
 System.out.println("c2="+c2);
 System.out.println("输入车票售价：");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 c3=br.readLine();
 }catch(IOException ex){}
 System.out.println("c3="+c3);
 System.out.println("输入该车票线路号：");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 c4=br.readLine();
 }catch(IOException ex){}
 System.out.println("c4="+c4);
 
 PreparedStatement pstmt2=con.prepareStatement("insert into 车票信息表 values(?,?,?,?)");
 pstmt2.setString(1,c1);
 pstmt2.setString(2,c2);
 pstmt2.setString(3,c3);
 pstmt2.setString(4,c4);
 
 pstmt2.executeUpdate();
 System.out.println("插入成功!");
 pstmt2.close();
 //pstmt1.close();
 //rs2.close();
 }
 if(m==4){
 String c1="",c2="",c3="",c4="",c5="";
 //PreparedStatement pstmt1=con.prepareStatement("select * from Finance where Uname=?");
 //pstmt1.setString(1,c1);
 //ResultSet rs2=pstmt1.executeQuery();
 System.out.println("输入你要添加乘客的汽车编号：");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 c1=br.readLine();
 }catch(IOException ex){}
 System.out.println("c1="+c1);
 System.out.println("输入该乘客出发地：");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 c2=br.readLine();
 }catch(IOException ex){}
 System.out.println("c2="+c2);
 System.out.println("输入该乘客目的地：");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 c3=br.readLine();
 }catch(IOException ex){}
 System.out.println("c3="+c3);
 System.out.println("输入乘坐线路号：");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 c4=br.readLine();
 }catch(IOException ex){}
 System.out.println("c4="+c4);
 System.out.println("输入乘客出发时间：");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 c4=br.readLine();
 }catch(IOException ex){}
 System.out.println("c5="+c5);
 PreparedStatement pstmt2=con.prepareStatement("insert into 乘客 values(?,?,?,?,?)");
 pstmt2.setString(1,c1);
 pstmt2.setString(2,c2);
 pstmt2.setString(3,c3);
 pstmt2.setString(4,c4);
 pstmt2.setString(5,c5);
 pstmt2.executeUpdate();
 pstmt2.close();
 System.out.println("添加成功!");
 //pstmt1.close();
 //rs2.close();
 }
 }
 if(x==3)
 {
 System.out.println("1.线路信息修改 2.汽车信息修改 3.车票信息修改 4.乘客信息修改");
 System.out.println("请选择：");
 int m=0;
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 m=Integer.parseInt(br.readLine());
 }catch(IOException ex){}
 if(m==1){
 String m11="";String m13="";int m12=0;
 System.out.println("选择你要修改的线路号：");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 m11=br.readLine();
 }catch(IOException ex){}
 PreparedStatement pstmt31=con.prepareStatement("select * from 线路信息表 where 线路号=?");
 pstmt31.setString(1,m11);
 ResultSet rs3=pstmt31.executeQuery();
 if(rs3.next()){
 System.out.println("输入你要修改的项：1.出发地 2.目的地 3.出发时间 4.所需时间");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 m12=Integer.parseInt(br.readLine());
 }catch(IOException ex){}
 if(m12==1){System.out.println(" 输入你修改后的出发地:");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 m13=br.readLine();
 }catch(IOException ex){}
 pstmt31.close();
 PreparedStatement pstmt3=con.prepareStatement("Update 线路信息表 set 出发地=? where  线路号=?");
 pstmt3.setString(1,m13);
 pstmt3.setString(2,m11); 
 pstmt3.executeUpdate();
 System.out.println("修改成功!");
 }
 if(m12==2){System.out.println(" 输入你修改后的目的地:");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 m13=br.readLine();
 }catch(IOException ex){}
 pstmt31.close();
 PreparedStatement pstmt3=con.prepareStatement("Update 线路信息表 set 目的地=? where  线路号=?");
 pstmt3.setString(1,m13);
 //pstmt3.setint(2,m11);
 pstmt3.setString(2,m11); 
 pstmt3.executeUpdate();
 System.out.println("修改成功!");
 rs3.close();
 //pstmt3.close(); 
 }
 if(m12==3){System.out.println(" 输入你修改后的出发时间:");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 m13=br.readLine();
 }catch(IOException ex){}
 pstmt31.close();
 PreparedStatement pstmt3=con.prepareStatement("Update 线路信息表 set 出发时间=? where 线路号=?");
 pstmt3.setString(1,m13);
 //pstmt3.setint(2,m11);
 pstmt3.setString(2,m11); 
 pstmt3.executeUpdate();
 System.out.println("修改成功!");
 rs3.close();
 //pstmt3.close();
 if(m12==4){System.out.println(" 输入你修改后的所需时间:");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 m13=br.readLine();
 }catch(IOException ex){}
 pstmt31.close();
 PreparedStatement pstmt311=con.prepareStatement("Update 线路信息表 set 所需时间=? where 线路号=?");
 pstmt311.setString(1,m13);
 //pstmt3.setint(2,m11);
 pstmt311.setString(2,m11); 
 pstmt311.executeUpdate();
 System.out.println("修改成功!");
 rs3.close();
 //pstmt3.close(); 
 }
 }
 else{System.out.println("你要更改的项不存在!");} 
 }
 if(m==2){
 String m111="";String m131="";int m121=0;
 System.out.println("选择你要修改的汽车编号：");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 m111=br.readLine();
 }catch(IOException ex){}
 PreparedStatement pstmt311=con.prepareStatement("select * from 汽车基本信息表 where 汽车编号=?");
 pstmt311.setString(1,m111);
 ResultSet rs31=pstmt311.executeQuery();
 if(rs31.next()){
 System.out.println("输入你要修改的项：1.汽车种类 2.最大载客量 3.线路号");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 m121=Integer.parseInt(br.readLine());
 }catch(IOException ex){}
 if(m121==1){System.out.println(" 输入你修改后的汽车种类:");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 m131=br.readLine();
 }catch(IOException ex){}
 pstmt311.close();
 PreparedStatement pstmt3=con.prepareStatement("Update  汽车基本信息表 set 汽车种类=? where  汽车编号=?");
 pstmt3.setString(1,m131);
 pstmt3.setString(2,m111); 
 pstmt3.executeUpdate();
 System.out.println("修改成功!");
 }
 if(m121==2){System.out.println(" 输入你修改后的最大载客量:");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 m131=br.readLine();
 }catch(IOException ex){}
 pstmt311.close();
 PreparedStatement pstmt3=con.prepareStatement("Update  汽车基本信息表 set 最大载客量=? where  汽车编号=?");
 pstmt3.setString(1,m131);
 //pstmt3.setint(2,m11);
 pstmt3.setString(2,m111); 
 pstmt3.executeUpdate();
 System.out.println("修改成功!");
 rs31.close();
 //pstmt3.close(); 
 }
 if(m121==3){System.out.println(" 输入你修改后的线路号:");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 m131=br.readLine();
 }catch(IOException ex){}
 pstmt311.close();
 PreparedStatement pstmt3=con.prepareStatement("Update  汽车基本信息表 set 线路号=? where 汽车编号=?");
 pstmt3.setString(1,m131);
 //pstmt3.setint(2,m11);
 pstmt3.setString(2,m111); 
 pstmt3.executeUpdate();
 System.out.println("修改成功!");
 rs31.close();
 }
 
 }
 else{System.out.println("你要更改的项不存在!");}
 }
 if(m==3){
 String m111="";String m131="";int m121=0;
 System.out.println("选择你要修改的车票编号：");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 m111=br.readLine();
 }catch(IOException ex){}
 PreparedStatement pstmt311=con.prepareStatement("select * from 车票信息表 where 车票编号=?");
 pstmt311.setString(1,m111);
 ResultSet rs31=pstmt311.executeQuery();
 if(rs31.next()){
 System.out.println("输入你要修改的项：1.售票情况 2.售价 3.线路号");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 m121=Integer.parseInt(br.readLine());
 }catch(IOException ex){}
 if(m121==1){System.out.println(" 输入你修改后的售票情况:");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 m131=br.readLine();
 }catch(IOException ex){}
 pstmt311.close();
 PreparedStatement pstmt3=con.prepareStatement("Update 车票信息表 set 售票情况=? where  车票编号=?");
 pstmt3.setString(1,m131);
 pstmt3.setString(2,m111); 
 pstmt3.executeUpdate();
 System.out.println("修改成功!");
 }
 if(m121==2){System.out.println(" 输入你修改后的售价:");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 m131=br.readLine();
 }catch(IOException ex){}
 pstmt311.close();
 PreparedStatement pstmt3=con.prepareStatement("Update 车票信息表 set 售价=? where  车票编号=?");
 pstmt3.setString(1,m131);
 //pstmt3.setint(2,m11);
 pstmt3.setString(2,m111); 
 pstmt3.executeUpdate();
 System.out.println("修改成功!");
 rs31.close();
 //pstmt3.close(); 
 }
 if(m121==3){System.out.println(" 输入你修改后的线路号:");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 m131=br.readLine();
 }catch(IOException ex){}
 pstmt311.close();
 PreparedStatement pstmt3=con.prepareStatement("Update 车票信息表 set 线路号=? where 车票编号=?");
 pstmt3.setString(1,m131);
 //pstmt3.setint(2,m11);
 pstmt3.setString(2,m111); 
 pstmt3.executeUpdate();
 System.out.println("修改成功!");
 rs31.close();
 }
 
 }
 else{System.out.println("你要更改的项不存在!");}
 }
 if(m==4){
 String m111="";String m131="";int m121=0;
 System.out.println("选择你要修改的汽车编号：");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 m111=br.readLine();
 }catch(IOException ex){}
 PreparedStatement pstmt311=con.prepareStatement("select * from 乘客信息表 where 汽车编号=?");
 pstmt311.setString(1,m111);
 ResultSet rs31=pstmt311.executeQuery();
 if(rs31.next()){
 System.out.println("输入你要修改的项：1.出发地2.目的地3.线路号 4.出发时间");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 m121=Integer.parseInt(br.readLine());
 }catch(IOException ex){}
 if(m121==1){System.out.println(" 输入你修改后的出发地:");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 m131=br.readLine();
 }catch(IOException ex){}
 pstmt311.close();
 PreparedStatement pstmt3=con.prepareStatement("Update 乘客信息表 set 出发地=? where  汽车编号=?");
 pstmt3.setString(1,m131);
 pstmt3.setString(2,m111); 
 pstmt3.executeUpdate();
 System.out.println("修改成功!");
 }
 if(m121==2){System.out.println(" 输入你修改后的目的地:");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 m131=br.readLine();
 }catch(IOException ex){}
 pstmt311.close();
 PreparedStatement pstmt3=con.prepareStatement("Update 乘客信息表 set 目的地=? where  汽车编号=?");
 pstmt3.setString(1,m131);
 //pstmt3.setint(2,m11);
 pstmt3.setString(2,m111); 
 pstmt3.executeUpdate();
 System.out.println("修改成功!");
 rs31.close();
 //pstmt3.close(); 
 }
 if(m121==3){System.out.println(" 输入你修改后的线路号:");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 m131=br.readLine();
 }catch(IOException ex){}
 pstmt311.close();
 PreparedStatement pstmt3=con.prepareStatement("Update 乘客信息表 set 线路号=? where 汽车编号=?");
 pstmt3.setString(1,m131);
 //pstmt3.setint(2,m11);
 pstmt3.setString(2,m111); 
 pstmt3.executeUpdate();
 System.out.println("修改成功!");
 rs31.close();
 }
 if(m121==4){System.out.println(" 输入你修改后的出发时间:");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 m131=br.readLine();
 }catch(IOException ex){}
 pstmt311.close();
 PreparedStatement pstmt3=con.prepareStatement("Update 乘客信息表 set 出发时间=? where 汽车编号=?");
 pstmt3.setString(1,m131);
 //pstmt3.setint(2,m11);
 pstmt3.setString(2,m111); 
 pstmt3.executeUpdate();
 System.out.println("修改成功!");
 rs31.close();
 }
 
 }
 }
 else{System.out.println("你要更改的项不存在!");}
 }
 
 
 
 }
 if(x==4)
 { 
 System.out.println("1.线路信息删除 2.汽车信息删除 3.车票信息删除 4.乘客信息删除");
 System.out.println("请选择：");
 int i=0;
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 i=Integer.parseInt(br.readLine());
 }catch(IOException ex){}
 if(i==1){
 String S1="";
 System.out.println("输入你要删除的线路信息表中的线路号：");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 S1=br.readLine();
 }catch(IOException ex){}
 PreparedStatement pstmt2=con.prepareStatement("delete from 线路信息表 where 线路号=?");
 pstmt2.setString(1,S1);
 System.out.println(S1);
 pstmt2.executeUpdate();
 System.out.println("已删除!");
 pstmt2.close();
 }
 if(i==2){
 String S1="";
 System.out.println("输入你要删除的汽车信息表的汽车编号：");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 S1=br.readLine();
 }catch(IOException ex){}
 PreparedStatement pstmt2=con.prepareStatement("delete from 汽车基本信息表 where 汽车编号=?");
 pstmt2.setString(1,S1);
 pstmt2.executeUpdate();
 System.out.println("已删除!");
 pstmt2.close();
 }
 if(i==3){
 String S1="";
 System.out.println("输入你要删除的车票信息表的车票编号：");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 S1=br.readLine();
 }catch(IOException ex){}
 PreparedStatement pstmt2=con.prepareStatement("delete from 车票信息表 where 车票编号=? ");
 pstmt2.setString(1,S1);
 pstmt2.executeUpdate();
 System.out.println("已删除!");
 pstmt2.close();
 }
 if(i==4){
 String S1="";
 System.out.println("输入你要删除的乘客信息表的汽车编号：");
 try{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 S1=br.readLine();
 }catch(IOException ex){}
 PreparedStatement pstmt2=con.prepareStatement("delete from 乘客信息表 where 汽车编号=? ");
 pstmt2.setString(1,S1);
 pstmt2.executeUpdate();
 System.out.println("已删除!");
 pstmt2.close();
 } 
 }
 }
 
 }catch(Exception e){
 System.out.println(e);
 }
 }
 private static void chengke() {
 // TODO Auto-generated method stub
 
 }
 private static void chepiao() {
 // TODO Auto-generated method stub
 
 }
 }