package com.zhidi.model;

public class Student {
	private int id;
	private String name;
	private String banji;
	private char sex;

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getBanji() {
		return banji;
	}

	public void setBanji(String banji) {
		this.banji = banji;
	}

	public char getSex() {
		return sex;
	}

	public void setSex(char sex) {
		this.sex = sex;
	}

	@Override
	public String toString() {
		return "學生  id=" + id + ", name=" + name + ", banji=" + banji + ", sex=" + sex ;
	}

}
 

package com.zhidi.db;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class DBUtil {
	private static final String URL = "jdbc:mysql://127.0.0.1:3306/person";
	private static final String USER = "root";
	private static final String PASSWORD = "root";
	private static Connection conn = null;
	static {
		try {
			//載入驅動程式
			Class.forName("com.mysql.jdbc.Driver");
			//獲得資料庫連線
			conn = DriverManager.getConnection(URL, USER, PASSWORD);
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

	public static Connection getConn() {
		return conn;
	}
}
 

package com.zhidi.dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;

import com.zhidi.db.DBUtil;
import com.zhidi.model.Student;

public class StuDao {

	private Connection conn = DBUtil.getConn();

	// 新增
	public void stuadd(Student stu) throws SQLException {
		String sql = "insert into student (name,class,sex) values (?,?,?)";
		PreparedStatement ps = conn.prepareStatement(sql);
		ps.setString(1, stu.getName());
		ps.setString(2, stu.getBanji());
		ps.setString(3, String.valueOf(stu.getSex()));
		boolean b = ps.execute();
		if (!b) {
			System.out.println(stu.getName() + "建立成功");
		} else {
			System.out.println(stu.getName() + "建立失敗");
		}

	}

	// 刪除
	public void deleteStu(int id) throws SQLException {
		String sql = "delete from Student where id =?";
		PreparedStatement ps = conn.prepareStatement(sql);

		ps.setInt(1, id);
		boolean b = ps.execute();
		if (!b) {
			System.out.println("刪除成功");
		} else {
			System.out.println("刪除失敗");
		}
	}

	// 修改
	public void updateStu(Student stu) throws SQLException {
		String sql = "update student set name=?,class=?,sex=? where id=?";
		PreparedStatement ps = conn.prepareStatement(sql);
		ps.setString(1, stu.getName());
		ps.setString(2, stu.getBanji());
		ps.setString(3, String.valueOf(stu.getSex()));//char型別轉為String型別
		ps.setInt(4, stu.getId());
		boolean b = ps.execute();
		if (!b) {
			System.out.println(stu.getName() + "修改成功");
		} else {
			System.out.println(stu.getName() + "修改失敗");
		}
	}

	// 查詢一個學生
	public Student selectStu(int id) throws SQLException {
		String sql = "select * from student where id=?";
		PreparedStatement ps = conn.prepareStatement(sql);
		ps.setInt(1, id);
		ResultSet rs = ps.executeQuery();
		Student stu = null;
		while (rs.next()) {
			stu = new Student();
			stu.setBanji(rs.getString("class"));
			stu.setId(rs.getInt("id"));
			stu.setName(rs.getString("name"));
			String str = rs.getString("sex");
			char[] c = str.toCharArray();//String型別轉為char型別
			for (char d : c) {
				stu.setSex(d);
			}

		}
		return stu;

	}

	// 查詢所有學生
	public List<Student> query() throws SQLException {
		Statement sta = conn.createStatement();// 建立宣告
		ResultSet rs = sta.executeQuery("select * from student");
		List<Student> list = new ArrayList<Student>();
		Student stu = null;

		while (rs.next()) {
			stu = new Student();
			stu.setBanji(rs.getString("class"));
			stu.setId(rs.getInt("id"));
			stu.setName(rs.getString("name"));
			String str = rs.getString("sex");
			char[] c = str.toCharArray();
			for (char d : c) {
				stu.setSex(d);
			}
			list.add(stu);
		}

		return list;

	}

}
 

package com.zhidi.control;

import java.sql.SQLException;
import java.util.List;

import com.zhidi.dao.StuDao;
import com.zhidi.model.Student;

public class StuControl {

	public static void main(String[] args) throws SQLException {

		StuDao sd = new StuDao();
		// 新增
		Student stu = new Student();

		stu.setName("yanyan");
		stu.setSex('男');
		stu.setBanji("四班");
		sd.stuadd(stu);
		
		// 刪除
		sd.deleteStu(5);
		
		// 修改
		Student stu1 = new Student();
		stu1.setId(6);
		stu1.setName("tomm");
		stu1.setBanji("五班");
		stu1.setSex('女');
		sd.updateStu(stu1);
		
		// 查詢一個學生
		Student stu2 = sd.selectStu(6);
		System.out.println(stu2);

		// 查詢所有學生
		List<Student> list = sd.query();
		for (Student s : list) {
			System.out.println(s.toString());

		}

	}

}