diff --git "a/46 \350\203\241\346\231\272\347\240\224/20230520\347\254\254\344\270\200\346\254\241\344\275\234\344\270\232.md.txt" "b/46 \350\203\241\346\231\272\347\240\224/20230520\347\254\254\344\270\200\346\254\241\344\275\234\344\270\232.md.txt"
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index 0000000000000000000000000000000000000000..a7164ac0366d67025ff5742d94bc75a474fae3f4
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+++ "b/46 \350\203\241\346\231\272\347\240\224/20230520\347\254\254\344\270\200\346\254\241\344\275\234\344\270\232.md.txt"	
@@ -0,0 +1,174 @@
+import java.sql.*;
+import java.util.Scanner;
+
+public class JDBC {
+    // ### JDBC作业：
+//1. MySQL中创建一个数据库student_db
+//2. 库中创建student表
+//3. 表中数据如下
+//4. | 编号 | 姓名 | 性别 |
+//   | ---- | ---- | ---- |
+//   | 1    | 张三 | 男   |
+//   | 2    | 李四 | 女   |
+//   | 3    | 王五 | 男   |
+//5. 编写java 4个类，分别实现以下功能
+//   1. 查询功能，查询student中所有数据
+//   2. 添加功能
+//   3. 修改功能
+//   4. 删除功能
+//6. 扩展题【预习题】
+//   1. 能否实现一个类中，用四个方法来实现上面4个类的功能
+//   2. 能否实现将查询的结果，封装成java对象
+    public static void main(String[] args) {
+        out:
+        for (; ; ) {
+            Scanner scanner = new Scanner(System.in);
+            System.out.println("输入你要的功能:\n" +
+                    "\t1,查询功能\n" +
+                    "\t2 添加功能\n" +
+                    "\t3 修改功能\n" +
+                    "\t4 删除功能\n" +
+                    "\t5 退出");
+            String choose = scanner.next();
+            switch (choose) {
+                case "1":
+                    System.out.println("你选择了查询功能");
+                    Inquire();//查询功能
+                    break;
+                case "2":
+                    System.out.println("你选择了添加功能");
+                    Add();    //添加功能
+                    break;
+                case "3":
+                    System.out.println("你选择了修改功能");
+                    Alter();  //修改功能
+                    break;
+                case "4":
+                    System.out.println("你选择了删除功能");
+                    Delete(); //删除功能
+                    break;
+                case "5":
+                    System.out.println("你选择了退出功能");
+                    break out;
+                default:
+                   System.out.println("对不起,没有这个功能!");
+
+
+            }
+        }
+    }
+
+    public static void Add() {
+//        添加功能
+        try {
+            Class.forName("com.mysql.jdbc.Driver");
+            String url = "jdbc:mysql://localhost:3306/student_db?useSSL=false&useUnicode=true&characterEncoding=utf8";
+            String usename = "root";
+            String password = "root";
+            Connection connection = DriverManager.getConnection(url, usename, password);
+            String Add = "insert into student values(1,'张三','男'),(2,'李四','女'),(3,'王五','男'),(4,'老六','男')";
+            Statement statement = connection.createStatement();
+            int i = statement.executeUpdate(Add);
+            if (i > 0) {
+                System.out.println("添加成功，添加了" + i + "行");
+            } else {
+                System.out.println("添加失败");
+            }
+            connection.close();
+            statement.close();
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException(e);
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+
+
+    }
+
+    public static void Delete() {
+        //    删除功能
+        try {
+            Class.forName("com.mysql.jdbc.Driver");
+            String url = "jdbc:mysql://localhost:3306/student_db?useSSL=false&useUnicode=true&characterEncoding=utf8";
+            String usename = "root";
+            String password = "root";
+            Connection connection = DriverManager.getConnection(url, usename, password);
+            String delete = "delete from student where id=4";
+            Statement statement = connection.createStatement();
+            int i = statement.executeUpdate(delete);
+            if (i > 0) {
+                System.out.println("删除成功,删除了" + i + "行");
+            } else {
+                System.out.println("删除失败!");
+            }
+            connection.close();
+            statement.close();
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException(e);
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public static void Alter() {
+        //    修改功能
+        try {
+            Class.forName("com.mysql.jdbc.Driver");
+            String url = "jdbc:mysql://localhost:3306/student_db?useSSL=false&useUnicode=true&characterEncoding=utf8";
+            String usename = "root";
+            String password = "root";
+            Connection connection = DriverManager.getConnection(url, usename, password);
+            String alter = "update student set name='李隐' where id=4";
+            Statement statement = connection.createStatement();
+            int i = statement.executeUpdate(alter);
+            if (i > 0) {
+                System.out.println("修改成功,修改了" + i + "行");
+            } else {
+                System.out.println("修改失败!");
+            }
+            connection.close();
+            statement.close();
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException(e);
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public static void Inquire() {
+
+        try {
+//            查询功能
+//        1.注册驱动
+            Class.forName("com.mysql.jdbc.Driver");
+//        2.链接对象
+            String url = "jdbc:mysql://localhost:3306/student_db?useSSL=false&useUnicode=true&characterEncoding=utf8";
+            String usename = "root";
+            String password = "root";
+            Connection connection = DriverManager.getConnection(url, usename, password);
+//        3.SQL的内容
+            String sql = "select *from student";
+//        4.获取执行SQL的内容
+            Statement statement = connection.createStatement();
+//        5.运行SQL
+            ResultSet resultSet = statement.executeQuery(sql);
+//        6.处理结果
+            while (resultSet.next()) {
+                int id = resultSet.getInt(1);
+                String name = resultSet.getString(2);
+                String sex = resultSet.getString(3);
+                System.out.println("ID:" + id + " 姓名:" + name + "  性别:" + sex);
+            }
+//        7.释放资源
+            connection.close();
+            statement.close();
+            resultSet.close();
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException(e);
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+
+    }
+}
+