package mysqljdbc;import java.math.BigDecimal;
import java.sql.*;
import java.util.Scanner;public class jdbcmysqljoin {
static {
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}public static void main(String[] args) {
Scanner scan=new Scanner(System.in);
System.out.println("有如下操作给您选择！！！");
System.out.println("1:查询学生信息");
System.out.println("2:添加学生信息");
System.out.println("3:删除学生信息");
System.out.println("4:修改学生信息");
System.out.println("请输入你要选择操作的序号");
int stop=scan.nextInt();
switch (stop){
case 1:select();students();students(); break;
case 2:insert();select();students();break;
case 3:delete();select();students();break;
case 4:update();select();students();break;
default:
System.out.println("退出成功");;
}
/* if(stop==1){
select();
}else if(stop==2){
insert();
return;
}else if (stop==3){
delete();
return;
}else if(stop==4){
update();
return;
}else{
System.out.println("请选择你要进行的操作");
System.out.println("1:查询学生信息");
System.out.println("2:添加学生信息");
System.out.println("3:删除学生信息");
System.out.println("4:修改学生信息");
}
//delete();//删除
// insert();//添加
// update();//修改
//select();//查询*/
}
//连接数据库查询数据
private static void select(){
try {
Connection conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/student2?useUnicode=true&characterEncoding=UTF-8","root","");
System.out.println("数据库连接成功");
PreparedStatement statement=conn.prepareStatement("select * from student");
ResultSet result=statement.executeQuery();
System.out.println("学生信息如下");
while (result.next()){
String sno=result.getString("sno");
String sname=result.getString("sname");
String ssex=result.getString("ssex");
Date sbirthday=result.getDate("sbirthday");
String classno=result.getString("class");
System.out.println("学号: "+sno+" 姓名: "+sname+" 性别: "+ssex+" 出生日期: "+sbirthday+" 编号: "+classno);}
result.close();
conn.close();
statement.close();
} catch (SQLException e) {
e.printStackTrace();
}
}//添加学生数据
private static void insert(){
try {
Scanner scanner=new Scanner(System.in);
Connection conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/student2?useUnicode=true&characterEncoding=UTF-8","root","");
PreparedStatement statement=conn.prepareStatement("insert into student values (?,?,?,?,?)");
System.out.println("学号: ");
String sno=scanner.nextLine();
System.out.println("姓名: ");
String sname=scanner.nextLine();
System.out.println("性别: ");
String ssex=scanner.nextLine();
System.out.println("出生日期: ");
String sbirthday=scanner.nextLine();
System.out.println("编号: ");
String classno=scanner.nextLine();statement.setString(1,sno);
statement.setString(2,sname);
statement.setString(3,ssex);
statement.setString(4,sbirthday);
statement.setString(5,classno);
int rows=statement.executeUpdate();
if (rows>0){
System.out.println("添加成功");
}else{
System.out.println("添加失败");
}
statement.close();
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}//删除学生信息
private static void delete(){
Scanner scanner=new Scanner(System.in);
try {
Connection conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/student2?useUnicode=true&characterEncoding=UTF-8","root","");
PreparedStatement statement=conn.prepareStatement("delete from student where sno=?");
System.out.println("请输入你要删除的学生学号");
String sno=scanner.nextLine();
statement.setString(1,sno);
int rows=statement.executeUpdate();
if(rows>0){
System.out.println("删除成功");
}else{
System.out.println("删除失败");
}
statement.close();
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}}//修改学生信息
private static void update(){
try {
Scanner scanner=new Scanner(System.in);
Connection conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/student2?useUnicode=true&characterEncoding=UTF-8","root","");
PreparedStatement statement=conn.prepareStatement("update student set sname=? where sno=? ");
System.out.println("请输入你要修改的学生的学号:");
String sno=scanner.nextLine();
System.out.println("请输入你将要修改学生最后的姓名:");
String sname=scanner.nextLine();
statement.setString(1,sname);
statement.setString(2,sno);
int rows=statement.executeUpdate();
if(rows>0){
System.out.println("修改成功");
}else{
System.out.println("修改失败");
}
statement.close();
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}public static void students(){
Scanner scan=new Scanner(System.in);
System.out.println("有如下操作给您选择！！！");
System.out.println("1:查询学生信息");
System.out.println("2:添加学生信息");
System.out.println("3:删除学生信息");
System.out.println("4:修改学生信息");
System.out.println("请输入你要选择操作的序号");
int stop=scan.nextInt();
switch (stop){
case 1:select();students();break;
case 2:insert();select();break;
case 3:delete();select();break;
case 4:update();select();break;
default:select();
}
students();
}
}