diff --git "a/work/com/java/minxi/java_20240524/java_2302_\347\206\212\344\273\201\346\235\260_2344310222/Mcd.java" "b/work/com/java/minxi/java_20240524/java_2302_\347\206\212\344\273\201\346\235\260_2344310222/Mcd.java"
new file mode 100644
index 0000000000000000000000000000000000000000..050466b5a4ea5b0711c668519eb4932aa658d162
--- /dev/null
+++ "b/work/com/java/minxi/java_20240524/java_2302_\347\206\212\344\273\201\346\235\260_2344310222/Mcd.java"
@@ -0,0 +1,73 @@
+package com.java.minxi.java_20240524.java_2302_熊仁杰_2344310222;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.ResultSet;
+import java.sql.Statement;
+
+public class Mcd {
+    public static void main(String[] args) throws Exception {
+        Demo1();
+        Demo2();
+        Demo3();
+    }
+    private static void Demo3() throws Exception{
+        String taurl = "jdbc:mysql:///192.168.255.255:3306/student?serverTimezone=Asia/Shanghai";
+        String username = "root";
+        String password = "123456";
+        Connection conn = DriverManager.getConnection(taurl, username, password);
+        String sql = "update teacher_info set teacher_name = '捞易' where id = 6;";
+        Statement stmt = conn.createStatement();
+        int i = stmt.executeUpdate(sql);
+        if (i>0){
+            System.out.println("修改成功~");
+        }else{
+            System.out.println("修改失败~");
+        }
+        stmt.close();
+        conn.close();
+    }
+    private static void Demo2() throws Exception{
+        //1. 获取连接
+        String taurl = "jdbc:mysql:///192.168.255.255:3306/student?serverTimezone=Asia/Shanghai";
+        String username = "root";
+        String password = "123456";
+        Connection conn = DriverManager.getConnection(taurl, username, password);
+        String sql = "select * from teacher_info where id = 1 && teacher_age = 20;";
+        Statement stmt = conn.createStatement();
+        ResultSet sd = stmt.executeQuery(sql);
+        System.out.println("id为1，且年龄为20岁的用户:");
+        System.out.println("id\t\tteacher_name\tteacher_age");
+        while (sd.next()){
+            int id = sd.getInt(1);
+            String name = sd.getString(2);
+            int age = sd.getInt(3);
+            System.out.println(id+"\t\t"+name+"\t\t\t"+age);
+        }
+        System.out.println();
+        sd.close();
+        stmt.close();
+        conn.close();
+    }
+    public static void Demo1() throws Exception{
+        String taurl = "jdbc:mysql:///192.168.255.255:3306/student?serverTimezone=Asia/Shanghai";
+        String username = "root";
+        String password = "123456";
+        Connection conn = DriverManager.getConnection(taurl, username, password);
+        String mysql = "select * from teacher_info;";
+        Statement stmt = conn.createStatement();
+        ResultSet sa = stmt.executeQuery(mysql);
+        System.out.println("所有用户信息:");
+        System.out.println("id\t\tteacher_name\tteacher_age");
+        while (sa.next()){
+            int id = sa.getInt("id");
+            String name = sa.getString("teacher_name");
+            int age = sa.getInt("teacher_age");
+            System.out.println(id+"\t\t"+name+"\t\t\t"+age);
+        }
+        System.out.println();
+        sa.close();
+        stmt.close();
+        conn.close();
+    }
+}
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