diff --git "a/04 \346\235\216\346\230\216\345\201\245/20230516 JDBC\344\275\234\344\270\232.md" "b/04 \346\235\216\346\230\216\345\201\245/20230516 JDBC\344\275\234\344\270\232.md"
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+++ "b/04 \346\235\216\346\230\216\345\201\245/20230516 JDBC\344\275\234\344\270\232.md"	
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+### Test类(查)
+
+~~~ java
+import java.sql.*;
+
+public class Test {
+    public static void main(String[] args) {
+        //1.注册驱动
+        ResultSet rst = null;
+        Statement smt = null;
+        Connection conn = null;
+        try {
+            Class.forName("com.mysql.jdbc.Driver");
+
+            //2.获取连接对象
+            String url ="jdbc:mysql://localhost:3306/student_db?useSSL=false&useUnicode=true&characterEncoding=utf8";
+            String username  ="root";
+            String password = "root";
+
+            conn = DriverManager.getConnection(url, username, password);
+
+            //3.编写SQL语句
+            String sql = "select * from student";
+
+            //4.获取执行SQL的对象
+            smt = conn.createStatement();
+
+            //5.用smt执行SQL
+            rst = smt.executeQuery(sql);
+
+            //处理返回结果(遍历结果)
+            while(rst.next()){
+                System.out.println(rst.getInt("id") +
+                        "\t" + rst.getString("name") +
+                        "\t  " + rst.getString("sex"));
+            }
+        } catch (ClassNotFoundException e) {
+            System.out.println("驱动包导入失败！");
+        } catch (SQLException e) {
+//            e.printStackTrace();
+            System.out.println("sql语句出错！");
+        } finally {
+            //7.释放资源
+            try {
+                if(rst!=null){
+                    rst.close();
+                }
+                if(smt!=null){
+                    smt.close();
+                }
+                if(conn!=null){
+                    conn.close();
+                }
+            } catch (SQLException e) {
+                System.out.println("释放资源出错");
+            }
+        }
+
+    }
+}
+~~~
+
+### Insert类（增）
+
+~~~ java
+import java.sql.*;
+
+public class Insert {
+    public static void main(String[] args) {
+        //1.注册驱动
+        try {
+            Class.forName("com.mysql.jdbc.Driver");
+
+            //2.获取连接的对象
+            String url = "jdbc:mysql://localhost:3306/student_db?useSSL=false&useUnicode=true&characterEncoding=utf8";
+            String username = "root";
+            String password = "root";
+
+            Connection conn = DriverManager.getConnection(url, username, password);
+
+            //3.编写SQL语句
+            String sql = "insert into student values(4,'小李','男')";
+
+            //4.获取执行SQL的对象
+            Statement smt = conn.createStatement();
+
+            //5.用smt执行SQL
+            int i = smt.executeUpdate(sql);
+
+            //6.处理返回结果(遍历结果)
+            if(i!=0){
+                System.out.println("添加成功！");
+                System.out.println("添加了"+i+"条数据");
+            }else{
+                System.out.println("添加了"+i+"条数据");
+                System.out.println("添加失败!");
+            }
+            //7.释放资源
+            smt.close();
+            conn.close();
+
+        } catch (ClassNotFoundException e) {
+            System.out.println("驱动包导入失败！");
+        } catch (SQLException e) {
+//            e.printStackTrace();
+            System.out.println("sql语句出错！");
+        }
+
+    }
+}
+~~~
+
+### Delete类（删）
+
+~~~ java
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.sql.Statement;
+
+public class Delete {
+    public static void main(String[] args) {
+        //1.注册驱动
+        try {
+            Class.forName("com.mysql.jdbc.Driver");
+
+            //2.获取连接的对象
+            String url = "jdbc:mysql://localhost:3306/student_db?useSSL=false&useUnicode=true&characterEncoding=utf8";
+            String username = "root";
+            String password = "root";
+
+            Connection conn = DriverManager.getConnection(url, username, password);
+
+            //3.编写SQL语句
+            String sql = "delete from student where id=4";
+
+            //4.获取执行SQL的对象
+            Statement smt = conn.createStatement();
+
+            //5.用smt执行SQL
+            int i = smt.executeUpdate(sql);
+
+            //6.处理返回结果(遍历结果)
+            if(i!=0){
+                System.out.println("删除成功！");
+                System.out.println("删除了"+i+"条数据");
+            }else{
+                System.out.println("删除了"+i+"条数据");
+                System.out.println("删除失败!");
+            }
+            //7.释放资源
+            smt.close();
+            conn.close();
+
+        } catch (ClassNotFoundException e) {
+            System.out.println("驱动包导入失败！");
+        } catch (SQLException e) {
+//            e.printStackTrace();
+            System.out.println("sql语句出错！");
+        }
+    }
+}
+~~~
+
+### Update类（改）
+
+~~~ java
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.sql.Statement;
+import java.util.Scanner;
+
+public class Update {
+    public static void main(String[] args) {
+
+
+        //1.注册驱动
+        try {
+            Class.forName("com.mysql.jdbc.Driver");
+
+            //2.获取连接的对象
+            String url = "jdbc:mysql://localhost:3306/student_db?useSSL=false&useUnicode=true&characterEncoding=utf8";
+            String username = "root";
+            String password = "root";
+
+
+            Connection conn = DriverManager.getConnection(url, username, password);
+
+            //3.编写SQL语句
+            String sql = "update student set sex='女' where id=3";
+
+            //4.获取执行SQL的对象
+            Statement smt = conn.createStatement();
+
+            //5.用smt执行SQL
+            int i = smt.executeUpdate(sql);
+
+            //6.处理返回结果(遍历结果)
+            if (i != 0) {
+                System.out.println("修改成功！");
+                System.out.println("修改了" + i + "条数据");
+            } else {
+                System.out.println("修改了" + i + "条数据");
+                System.out.println("修改失败!");
+            }
+            //7.释放资源
+            smt.close();
+            conn.close();
+
+        } catch (ClassNotFoundException e) {
+            System.out.println("驱动包导入失败！");
+        } catch (SQLException e) {
+//            e.printStackTrace();
+            System.out.println("sql语句出错！");
+        }
+    }
+}
+~~~
+
+
+
+Mysql
+
+~~~ mysql
+create database student_db charset utf8;
+use student_db;
+
+create table student(
+	id int,
+	name varchar(5),
+	sex varchar(1)
+);
+
+insert into student values
+(1,"张三","男"),
+(2,"李四","女"),
+(3,"王五","男");
+
+
+~~~
+