DBUtil 实战学生管理系统

实战要求：使用DBUtil工具实现简单学生管理系统，要求： 添加学生信息，不允许添加学号相同的学生信息； 删除学生信息，根据学号删除学生信息； 修改学生信息，根据学号获取学生信息，修改后保存到集合中； 查询学生信息，根据学号在控制台显示学生基本信息：

定义抽象类接口：

import java.sql.ResultSet;

public interface IRowMapper {
        void rowMapper(ResultSet resultSet);
}

 

 

 

import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Scanner;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;

import jdbc.IRowMapper;

public class shuju {
    public static void main(String[] args) {
	System.out.println("*****************************");
	System.out.println("*                           *");
	System.out.println("*   欢迎使用学生信息管理系统     *");
	System.out.println("*                            ");
	System.out.println("*****************************");

	for (;;) {
		System.out.println("1.添加学生信息");
		System.out.println("2.删除学生信息");
		System.out.println("3.修改学生信息");
		System.out.println("4.查询学生信息");
		System.out.println("5.按enter键以进行下步操作");
		Scanner scanner = new Scanner(System.in);
		int option = scanner.nextInt();
		switch (option) {
		case 1: {
			System.out.println("请输入学生的学号");
			String id = scanner.next();
			System.out.println("请输入学生的姓名");
			String name = scanner.next();
			if (Utibil.Exsit("select * from student where id=?", id)) {
				System.out.println("学号不能重复");
				return;
			}
			if (Utibil.Exsit("insert into student (name,id)values(??)", name, id)) {
				System.out.println("添加成功");
			} else {
				System.out.println("添加失败");
			}
			break;
		}

		case 2: {
			System.out.println("请输入学生的学号");
			String id = scanner.next();
			if (Utibil.update("delect * from student where id=?", id)) {
				System.out.println("删除成功");
			} else {
				System.out.println("删除失败");
			}
			break;

		}
		case 3: {
			System.out.println("请输入学生的学号");
			String id = scanner.next();
			String sql = "select name from user_info where id=" + id + "";
			if (!Utibil.Exsit("select * from student where id=?", id)) {
				System.out.println("学号不存在，修改失败");
			}
			System.out.println("请输入学生的新学号");
			id = scanner.next();
			System.out.println("请输入学生的新姓名");
			String name = scanner.next();
			
				if (Utibil.update("update student set name? where id?", name,id)) {
					System.out.println("修改成功");
				} else {
					System.out.println("修改失败");
    			        }
			break;
		}

		case 4: {
			System.out.println("请输入学生的学号");
			String id = scanner.next();
			    class RowMapper implements IRowMapper{
                                @Override
				public void rowMapper(ResultSet resultSet) {
				    try {
					if(resultSet.next()) {
					String id = resultSet.getString("id");
					String name = resultSet.getString("name");
					String mobile = resultSet.getString("mobile");
					String address = resultSet.getString("address");
					System.out.println("id="+id+",name="+name+",mobile="+mobile+",address="+address);
					}else {
						System.out.println("不存在");
					}
					} catch (SQLException e) {
						e.printStackTrace();
					}
				}
			}
		DBUtil.select("select * from student where id=?", new RowMapper(), id);
			IRowMapper rowMapper=(ResultSet resultSet)->{			                  try {
				if(resultSet.next()) {
				String name = resultSet.getString("name");
				String mobile = resultSet.getString("mobile");
				String address = resultSet.getString("address");
				System.out.println("id="+id+",name="+name+",mobile="+mobile+",address="+address);
			    }else {
				System.out.println("不存在");
			    }
			   } catch (SQLException e) {
				e.printStackTrace();
			}
		};	
	DBUtil.select("select * from student where id=?", rowMapper, id);
		
	DBUtil.select("select * from student where id=?", (ResultSet resultSet)->{
		        try {
			if(resultSet.next()) {
				String name = resultSet.getString("name");
				String mobile = resultSet.getString("mobile");
				String address = resultSet.getString("address");
				System.out.println("id="+id+",name="+name+",mobile="+mobile+",address="+address);
			}else {
				System.out.println("不存在");
			}
			} catch (SQLException e) {
			    e.printStackTrace();
			}
		}, id);		   	    }    
		          }
		        break;

		    }
	       }
	 }
    }
}