diff --git "a/26 \351\231\210\344\275\263\347\202\234/20230517 JDBS\344\275\234\344\270\232.md" "b/26 \351\231\210\344\275\263\347\202\234/20230517 JDBS\344\275\234\344\270\232.md"
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+### 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
+
+      ~~~ sql
+      create database student_db charset utf8;
+      use student_db;
+      create table student(
+      	 id int,
+      	 name varchar(20),
+      	 sex varchar(5)
+      );
+      alter table student charset utf8;
+      insert into student values
+      (1,"张三","男"),
+      (2,"李四","女"),
+      (3,"王五","男");
+      ~~~
+      
+      
+      
+      ~~~ java
+      // 查询测试类
+      import java.sql.*;
+      import java.util.concurrent.Callable;
+      
+      public class Test {
+          public static void main(String[] args) {
+              Connection conn = null;
+              Statement smt = null;
+              ResultSet rst = null;
+              // 1.建立驱动
+              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 uesrname = "root";
+                  String password = "root";
+                  conn = DriverManager.getConnection(url, uesrname, password);
+                  // 3.定义sql语言
+                  String sql = "select * from student";
+                  // 4.获取执行SQL的对象
+                  smt = conn.createStatement();
+                  // 5.执行SQL
+                  rst = smt.executeQuery(sql);
+                  // 6.处理返回结果
+                  while(rst.next()){
+                      int id = rst.getInt("id");
+                      String name = rst.getString("name");
+                      String sex = rst.getString("sex");
+                      System.out.println(id+":"+name+"-"+sex);
+                  }
+              } catch (ClassNotFoundException e) {
+                  System.out.println("编译出错");
+              } catch (SQLException e) {
+                  System.out.println("SQL出错");
+              }
+              // 7.释放资源
+              try {
+                  if (conn!=null){
+                      conn.close();
+                  }
+                  if (smt!=null){
+                      smt.close();
+                  }
+                  if (rst!=null){
+                      rst.close();
+                  }
+              } catch (SQLException e) {
+                  System.out.println("释放资源出错");
+              }
+          }
+      }
+      
+      ~~~
+      
+      ~~~ java
+      // 添加测试类
+      import java.sql.*;
+      
+      public class Insert {
+          public static void main(String[] args) {
+              // 1.建立驱动
+              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 uesrname = "root";
+                  String password = "root";
+                  Connection conn = DriverManager.getConnection(url, uesrname, password);
+                  // 3.定义sql语言
+                  String sql = "insert into student values (4,'赵六','女')";
+                  // 4.获取执行SQL的对象
+                  Statement smt = conn.createStatement();
+                  // 5.执行SQL
+                  int i  = smt.executeUpdate(sql);
+                  // 6.处理返回结果
+                  if (i>0){
+                      System.out.println("添加成功");
+                  }else{
+                      System.out.println("添加失败");
+                  }
+              } catch (ClassNotFoundException e) {
+                  System.out.println("编译出错");
+              } catch (SQLException e) {
+                  System.out.println("SQL出错");
+              }
+          }
+      }
+      
+      ~~~
+      
+      ~~~ java
+      // 删除测试类
+      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.建立驱动
+              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 uesrname = "root";
+                  String password = "root";
+                  Connection conn = DriverManager.getConnection(url, uesrname, password);
+                  // 3.定义sql语言
+                  String sql = "delete  from student where  id=4";
+                  // 4.获取执行SQL的对象
+                  Statement smt = conn.createStatement();
+                  // 5.执行SQL
+                  int i  = smt.executeUpdate(sql);
+                  // 6.处理返回结果
+                  if (i>0){
+                      System.out.println("删除成功");
+                  }else{
+                      System.out.println("删除失败");
+                  }
+              } catch (ClassNotFoundException e) {
+                  System.out.println("编译出错");
+              } catch (SQLException e) {
+                  System.out.println("SQL出错");
+              }
+          }
+      }
+      
+      ~~~
+      
+      ~~~ java
+      // 修改测试类
+      import java.sql.Connection;
+      import java.sql.DriverManager;
+      import java.sql.SQLException;
+      import java.sql.Statement;
+      
+      public class Update {
+          public static void main(String[] args) {
+              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 uesrname = "root";
+                  String password = "root";
+                  Connection conn = DriverManager.getConnection(url, uesrname, password);
+                  // 3.定义sql语言
+                  String sql = "update student set sex='女' where id=3";
+                  // 4.获取执行SQL的对象
+                  Statement smt = conn.createStatement();
+                  // 5.执行SQL
+                  int i  = smt.executeUpdate(sql);
+                  // 6.处理返回结果
+                  if (i>0){
+                      System.out.println("修改成功");
+                  }else{
+                      System.out.println("修改失败");
+                  }
+              } catch (ClassNotFoundException e) {
+                  System.out.println("编译出错");
+              } catch (SQLException e) {
+                  System.out.println("SQL出错");
+              }
+          }
+      }
+      
+      ~~~
+      
+      
+
+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
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diff --git "a/26 \351\231\210\344\275\263\347\202\234/jdbc\345\260\201\350\243\205.md" "b/26 \351\231\210\344\275\263\347\202\234/jdbc\345\260\201\350\243\205.md"
new file mode 100644
index 0000000000000000000000000000000000000000..fcdaf7ae19a09e530db2d3704d9fc66a79a0d2a3
--- /dev/null
+++ "b/26 \351\231\210\344\275\263\347\202\234/jdbc\345\260\201\350\243\205.md"	
@@ -0,0 +1,208 @@
+```java
+import java.sql.*;
+
+public class text {
+    private static String url = "jdbc:mysql:///student_db?useSSL=false&characterEncoding=utf8";
+    private static final String user = "root";
+    private static final String password = "root";
+static {
+    try {
+        Class.forName("com.mysql.jdbc.Driver");
+    } catch (ClassNotFoundException e) {
+        System.out.println("驱动注册异常");
+        e.printStackTrace();
+    }
+}
+
+public static Connection getConn() {
+    Connection conn = null;
+    try {
+        conn = DriverManager.getConnection(url, user, password);
+    } catch (SQLException e) {
+        System.out.println("获取连接对象失败");
+        e.printStackTrace();
+    }
+    return conn;
+}
+
+public static ResultSet query(String sql, String... keys) {
+    ResultSet rs = null;
+    try {
+        Connection conn = getConn();
+        PreparedStatement pst = conn.prepareStatement(sql);
+        for (int i = 0; i < keys.length; i++) {
+            pst.setString((i + 1), keys[i]);
+        }
+        rs = pst.executeQuery();
+    } catch (SQLException e) {
+        System.out.println("执行查询异常");
+        e.printStackTrace();
+    }
+    return rs;
+}
+}
+```
+# 查询测试类
+
+```java
+public class Test2 {
+    public static void main(String[] args) {
+        ArrayList<Studen> list = new ArrayList<>();//集合
+        String sql="select * from studen";
+        ResultSet que = Testt.query(sql);
+        try {
+            while (que.next()){
+                String id=que.getString("id");
+                String name=que.getString("name");
+                String sex= que.getString("sex");
+                Studen stu = new Studen(id, name, sex);
+                list.add(stu);
+            }
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+        for (int i = 0; i <list.size(); i++) {
+            Studen n=list.get(i);
+            System.out.println(n.getId()+":"+n.getName()+"--"+n.getSex());
+        }
+        try {
+            que.close();
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}
+```
+
+##  增删改
+
+```java
+import java.sql.*;
+
+public class text {
+    private static String url = "jdbc:mysql:///student_db?useSSL=false&characterEncoding=utf8";
+    private static final String user = "root";
+    private static final String password = "root";
+static {
+    try {
+        Class.forName("com.mysql.jdbc.Driver");
+    } catch (ClassNotFoundException e) {
+        System.out.println("驱动注册异常");
+        e.printStackTrace();
+    }
+}
+
+public static Connection getConn() {
+    Connection conn = null;
+    try {
+        conn = DriverManager.getConnection(url, user, password);
+    } catch (SQLException e) {
+        System.out.println("获取连接对象失败");
+        e.printStackTrace();
+    }
+    return conn;
+}
+
+public static ResultSet query(String sql, String... keys) {
+    ResultSet rs = null;
+    try {
+        Connection conn = getConn();
+        PreparedStatement pst = conn.prepareStatement(sql);
+        for (int i = 0; i < keys.length; i++) {
+            pst.setString((i + 1), keys[i]);
+        }
+        rs = pst.executeUpdate();
+    } catch (SQLException e) {
+        System.out.println("执行查询异常");
+        e.printStackTrace();
+    }
+    return rs;
+}
+}
+```
+
+###  增删改测试类
+
+```java
+public class Test01 {
+    public static void main(String[] args) {
+        ArrayList<Studen> list = new ArrayList<>();
+        String sql="update studen set name='波仔' where id=1";
+        int que = ZSG.query(sql);
+        try {
+            System.out.println("修改成功！");
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        for (int i = 0; i <list.size(); i++) {
+            Studen n=list.get(i);
+            System.out.println(n.getId()+":"+n.getName()+"--"+n.getSex());
+        }
+    }
+}
+```
+
+##  属性类
+
+```java
+public class Studen {
+    private String id;
+    private String name;
+    private String sex;
+
+    @Override
+    public String toString() {
+        return "Studen{" +
+                "id='" + id + '\'' +
+                ", name='" + name + '\'' +
+                ", sex='" + sex + '\'' +
+                '}';
+    }
+
+    public String getId() {
+        return id;
+    }
+
+    public void setId(String id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getSex() {
+        return sex;
+    }
+
+    public void setSex(String sex) {
+        this.sex = sex;
+    }
+
+    public Studen(int id, String name, String sex) {
+    }
+
+    public Studen(String id, String name, String sex) {
+        this.id = id;
+        this.name = name;
+        this.sex = sex;
+    }
+}
+
+```
+
+CREATE DATABASE student_db charset utf8;
+use student_db;
+CREATE TABLE student(
+id int,
+name varchar(20),
+sex enum('男','女')
+);
+INSERT into student VALUES
+(1,'张三','男'),
+(2,'李四','女'),
+(3,'王五','男');
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