diff --git "a/03 \350\265\226\345\277\203\345\246\215/20230516 JDBC\344\275\234\344\270\232\357\274\232.md" "b/03 \350\265\226\345\277\203\345\246\215/20230516 JDBC\344\275\234\344\270\232\357\274\232.md"
deleted file mode 100644
index cfcbc6ef4e4f5f34acad1ef81c5abec8827e6171..0000000000000000000000000000000000000000
--- "a/03 \350\265\226\345\277\203\345\246\215/20230516 JDBC\344\275\234\344\270\232\357\274\232.md"	
+++ /dev/null
@@ -1,175 +0,0 @@
-### 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
-
-      ```java
-      public class Select {
-          public static void main(String[] args) {
-              ResultSet rst = null;
-              Statement smt = null;
-              Connection conn = null;
-              try {
-                  Class.forName("com.mysql.fabric.jdbc.FabricMySQLDriver");
-                  String url = "jdbc:mysql://localhost:3306/student_db?useSSL=false&useUnicode=true&characterEncoding=utf8";
-                  String user = "root";
-                  String password = "root";
-                  conn = DriverManager.getConnection(url, user, password);
-                  String sql = "select * from student";
-                  smt = conn.createStatement();
-                  rst = smt.executeQuery(sql);
-                  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("驱动包没有正确导入，请检查！");
-              } catch (SQLException e) {
-                  System.out.println("sql语句执行错误！");
-                  e.printStackTrace();
-              } finally {
-                  try {
-                      rst.close();
-                      smt.close();
-                      conn.close();
-                  } catch (SQLException e) {
-                      System.out.println("资源释放异常");
-                  }
-              }
-          }
-      }
-      ```
-
-   2. 添加功能
-
-      ```
-      public class Insert {
-          public static void main(String[] args) {
-              Statement st = null;
-              Connection conn = null;
-              try {
-                  Class.forName("com.mysql.fabric.jdbc.FabricMySQLDriver");
-                  String url = "jdbc:mysql://localhost:3306/student_db?useSSL=false&Unicode=true&characterEncoding=utf8";
-                  String user = "root";
-                  String password = "root";
-                  conn = DriverManager.getConnection(url, user, password);
-                  String sql = "insert into student values(4,'娜娜','女')";
-                  st = conn.createStatement();
-                  int i = st.executeUpdate(sql);
-                  if (i > 0) {
-                      System.out.println("成功插入" + i + "行");
-                  } else {
-                      System.out.println("插入失败，插入" + i + "行");
-                  }
-              } catch (ClassNotFoundException e) {
-                  System.out.println("驱动包没有正确导入，请检查！");
-              } catch (SQLException e) {
-                  System.out.println("sql执行语句错误！");
-                  e.printStackTrace();
-              } finally {
-                  try {
-                      st.close();
-                      conn.close();
-                  } catch (SQLException e) {
-                      System.out.println("释放资源失败");
-                  }
-              }
-          }
-      }
-      ```
-
-   3. 修改功能
-
-      ```java
-      public class Update {
-          public static void main(String[] args) {
-              Statement st = null;
-              Connection conn = null;
-              try {
-                  Class.forName("com.mysql.fabric.jdbc.FabricMySQLDriver");
-                  String url = "jdbc:mysql://localhost:3306/student_db?useSSL=false&useUnicode=true&characterEncoding=utf8";
-                  String user = "root";
-                  String password = "root";
-                  conn = DriverManager.getConnection(url, user, password);
-                  String sql = "update student set name='NANA' where id=4";
-                  st = conn.createStatement();
-                  int i = st.executeUpdate(sql);
-                  if (i > 0) {
-                      System.out.println("成功修改" + i + "行");
-                  } else {
-                      System.out.println("修改失败，修改" + i + "行");
-                  }
-              } catch (ClassNotFoundException e) {
-                  System.out.println("驱动包没有正确导入，请检查！");
-              } catch (SQLException e) {
-                  System.out.println("sql语句执行错误！");
-                  e.printStackTrace();
-              } finally {
-                  try {
-                      st.close();
-                      conn.close();
-                  } catch (SQLException e) {
-                      System.out.println("资源释放异常");
-                  }
-              }
-          }
-      }
-      ```
-
-   4. 删除功能
-
-      ```java
-      public class Delete {
-          public static void main(String[] args) {
-              Statement st = null;
-              Connection conn = null;
-              try {
-                  Class.forName("com.mysql.fabric.jdbc.FabricMySQLDriver");
-                  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);
-                  String sql = "delete from Student where id=4";
-                  st = conn.createStatement();
-                  int i = st.executeUpdate(sql);
-                  if (i > 0) {
-                      System.out.println("删除成功,删除了" + i + "行");
-                  } else {
-                      System.out.println("删除失败,删除了" + i + "行");
-                  }
-              } catch (ClassNotFoundException e) {
-                  System.out.println("驱动包没有正确导入，请检查！");
-              } catch (SQLException e) {
-                  System.out.println("sql语句执行错误！");
-                  e.printStackTrace();
-              } finally {
-                  try {
-                      st.close();
-                      conn.close();
-                  } catch (SQLException e) {
-                      System.out.println("资源释放异常");
-                  }
-              }
-          }
-      }
-      ```
-
-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
\ No newline at end of file
diff --git "a/05 \350\260\242\351\223\226\346\265\251/JDBC\344\275\234\344\270\232\357\274\232.md" "b/05 \350\260\242\351\223\226\346\265\251/JDBC\344\275\234\344\270\232\357\274\232.md"
deleted file mode 100644
index b331d9349d0b3c26e7be715e85febc525c73cc4f..0000000000000000000000000000000000000000
--- "a/05 \350\260\242\351\223\226\346\265\251/JDBC\344\275\234\344\270\232\357\274\232.md"	
+++ /dev/null
@@ -1,201 +0,0 @@
-### JDBC作业：
-
-1. MySQL中创建一个数据库student_db
-
-   ~~~ sql
-   CREATE database student_db charset utf8;
-   use student_db;
-   ~~~
-
-   
-
-2. 库中创建student表
-
-   ~~~ sql
-   CREATE TABLE student(
-   id int,
-   name varchar(20),
-   sex char
-   );
-   ~~~
-
-   
-
-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   |
-
-   ~~~ sql
-   INSERT into student VALUES(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
-
-      ~~~ JAVA
-      import java.sql.*;
-      
-      public class Select {
-          public static void main(String[] args) {
-              Connection conn=null;
-              Statement sta=null;
-              ResultSet res=null;
-              try {
-                  Class.forName("com.mysql.jdbc.Driver");
-                  String url="jdbc:mysql://localhost:3306/student_db?useSSL=false";
-                  String username="root";
-                  String password="root";
-                   conn = DriverManager.getConnection(url, username, password);
-                  String sql="select * from student";
-                   sta = conn.createStatement();
-                   res = sta.executeQuery(sql);
-                  while (res.next()){
-                      int id = res.getInt("id");
-                      String name=res.getString("name");
-                      String sex=res.getString("sex");
-                      System.out.println(id+"-"+name+"-"+sex);
-                  }
-      
-              } catch (ClassNotFoundException e) {
-                  System.out.println("驱动包错误");
-                  e.printStackTrace();
-              } catch (SQLException e) {
-                  System.out.println("sql错误");
-                  e.printStackTrace();
-              }
-              try {
-                  if (res!=null){
-                  res.close();}
-                  if (sta!=null){
-                  sta.close();}
-                  if(conn!=null){
-                  conn.close();}
-              } catch (Exception e) {
-                  System.out.println("释放异常");
-              }
-      
-          }
-      }
-      ~~~
-
-   2. 添加功能
-
-      ~~~ java
-      import java.sql.*;
-      
-      public class insert {
-          public static void main(String[] args) {
-      
-      
-              try {
-                  Class.forName("com.mysql.jdbc.Driver");
-                  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);
-                  String sql="insert into student values(4,'小李','女')";
-                  Statement sta = conn.createStatement();
-                  int i = sta.executeUpdate(sql);
-                  if (i>0){
-                      System.out.println("添加成功");
-                  }else {
-                      System.out.println("添加失败");
-                  }
-      
-              } catch (ClassNotFoundException e) {
-                  System.out.println("驱动包错误");
-              } catch (SQLException e) {
-                  System.out.println("sql错误");
-              }
-      
-      
-          }
-      }
-      
-      ~~~
-      
-   3. 修改功能
-   
-      ~~~ java
-      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");
-                  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);
-                  String sql="update student set name='小李子' where id=4";
-                  Statement sta = conn.createStatement();
-                  int i = sta.executeUpdate(sql);
-                  if (i>0){
-                      System.out.println("修改成功");
-                  }else {
-                      System.out.println("修改失败");
-                  }
-      
-              } catch (ClassNotFoundException e) {
-                  System.out.println("驱动包错误");
-              } catch (SQLException e) {
-                  System.out.println("sql错误");
-              }
-          }
-      }
-      
-      ~~~
-      
-      
-      
-   4. 删除功能
-   
-      ~~~ 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) {
-              try {
-                  Class.forName("com.mysql.jdbc.Driver");
-                  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);
-                  String sql="delete from student where name='小李子'";
-                  Statement sta = conn.createStatement();
-                  int i = sta.executeUpdate(sql);
-                  if (i>0){
-                      System.out.println("删除成功");
-                  }else {
-                      System.out.println("删除失败");
-                  }
-      
-              } catch (ClassNotFoundException e) {
-                  System.out.println("驱动包错误");
-              } catch (SQLException e) {
-                  System.out.println("sql错误");
-              }
-          }
-      }
-      
-      ~~~
-      
-      
-   
-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
\ No newline at end of file
diff --git "a/09 \346\233\271\346\255\243\346\263\242/20230516 JAVA-JBDC\344\275\234\344\270\232.md" "b/09 \346\233\271\346\255\243\346\263\242/20230516 JAVA-JBDC\344\275\234\344\270\232.md"
deleted file mode 100644
index cd4dc38024668772a1d3e5319ae6b47708ce8edc..0000000000000000000000000000000000000000
--- "a/09 \346\233\271\346\255\243\346\263\242/20230516 JAVA-JBDC\344\275\234\344\270\232.md"	
+++ /dev/null
@@ -1,181 +0,0 @@
-## 作业
-
-## 数据库代码
-
-```mysql
-create database student_db CHARSET utf8;
-use student_db;
-CREATE table studen(
-	id int,
-	name varchar(10),
-	sex enum('男','女')
-);
-insert into studen values
-(1,'张三','男'),
-(2,'李四','女'),
-(3,'王五','男');
-```
-
-## 查询
-
-```java
-public class Sele {
-    public static void main(String[] args) {
-        ResultSet re = null;
-        Statement sta = null;
-        Connection con = null;
-        try {
-            Class.forName("com.mysql.jdbc.Driver");
-            String url = "jdbc:mysql://localhost:3306/student_db?useSSL=false&characterEncoding=utf8";//地址
-            String usename = "root";//数据库用户名
-            String password = "root";//数据库密码
-            con = DriverManager.getConnection(url, usename, password);
-            String sql = "select * from studen";
-            sta = con.createStatement();
-            re = sta.executeQuery(sql);
-            while (re.next()) {
-                System.out.println(re.getInt("id") + ":" + re.getString("name") +" "+ re.getString("sex"));
-            }
-        } catch (ClassNotFoundException e) {
-            System.out.println("驱动包导入错误！");
-        } catch (SQLException e) {
-            System.out.println("SQL语句错误!");
-        } finally {
-            try {
-                if (con != null) {
-                    con.close();
-                }
-                if (sta != null) {
-                    sta.close();
-                }
-                if (re != null) {
-                    re.close();
-                }
-            } catch (SQLException e) {
-                throw new RuntimeException(e);
-            }
-        }
-
-    }
-}
-
-```
-
-
-
-## 添加
-
-```java
-public class Inse {
-    public static void main(String[] args) {
-        Statement sta = null;
-        Connection con = null;
-        try {
-            Class.forName("com.mysql.jdbc.Driver");
-            String url = "jdbc:mysql://localhost:3306/student_db?useSSL=false&characterEncoding=utf8";//地址
-            String usename = "root";//数据库用户名
-            String password = "root";//数据库密码
-            con = DriverManager.getConnection(url, usename, password);
-            String sql = "insert into studen values(4,'赵六','男')";
-            sta = con.createStatement();
-            int i = sta.executeUpdate(sql);
-            System.out.println("添加成功！");
-        } catch (ClassNotFoundException e) {
-            System.out.println("驱动包导入错误！");
-        } catch (SQLException e) {
-            System.out.println("SQL语句错误!");
-        } finally {
-            try {
-                if (con != null) {
-                    con.close();
-                }
-                if (sta != null) {
-                    sta.close();
-                }
-            } catch (SQLException e) {
-                throw new RuntimeException(e);
-            }
-        }
-    }
-}
-
-```
-
-
-
-## 修改
-
-```java
-public class Upda {
-    public static void main(String[] args) {
-        Statement sta = null;
-        Connection con = null;
-        try {
-            Class.forName("com.mysql.jdbc.Driver");
-            String url = "jdbc:mysql://localhost:3306/student_db?useSSL=false&characterEncoding=utf8";//地址
-            String usename = "root";//数据库用户名
-            String password = "root";//数据库密码
-            con = DriverManager.getConnection(url, usename, password);
-            String sql = "update studen set name='老六' where id=4";
-            sta = con.createStatement();
-            int i = sta.executeUpdate(sql);
-            System.out.println("修改成功！");
-        } catch (ClassNotFoundException e) {
-            System.out.println("驱动包导入错误！");
-        } catch (SQLException e) {
-            System.out.println("SQL语句错误!");
-        } finally {
-            try {
-                if (con != null) {
-                    con.close();
-                }
-                if (sta != null) {
-                    sta.close();
-                }
-            } catch (SQLException e) {
-                throw new RuntimeException(e);
-            }
-        }
-    }
-}
-
-```
-
-## 删除
-
-```java
-public class Dele {
-    public static void main(String[] args) {
-        Statement sta = null;
-        Connection con = null;
-        try {
-            Class.forName("com.mysql.jdbc.Driver");
-            String url = "jdbc:mysql://localhost:3306/student_db?useSSL=false&characterEncoding=utf8";//地址
-            String usename = "root";//数据库用户名
-            String password = "root";//数据库密码
-            con = DriverManager.getConnection(url, usename, password);
-            String sql = "delete from studen where id=4";
-            sta = con.createStatement();
-            int i = sta.executeUpdate(sql);
-            System.out.println("删除成功！");
-        } catch (ClassNotFoundException e) {
-            System.out.println("驱动包导入错误！");
-        } catch (SQLException e) {
-            System.out.println("SQL语句错误!");
-        } finally {
-            try {
-                if (con != null) {
-                    con.close();
-                }
-                if (sta != null) {
-                    sta.close();
-                }
-            } catch (SQLException e) {
-                throw new RuntimeException(e);
-            }
-        }
-    }
-}
-
-```
-
diff --git "a/11 \351\202\271\344\272\250\344\274\237/0517JDBC\344\275\234\344\270\232.md" "b/11 \351\202\271\344\272\250\344\274\237/0517JDBC\344\275\234\344\270\232.md"
deleted file mode 100644
index 2a8a01684613e17cea42c4b62c3a5ec85110364e..0000000000000000000000000000000000000000
--- "a/11 \351\202\271\344\272\250\344\274\237/0517JDBC\344\275\234\344\270\232.md"	
+++ /dev/null
@@ -1,204 +0,0 @@
-### 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. CREATE DATABASE student_db CHARSET utf8;
-   USE student_db;
-   CREATE TABLE student(
-   	id int,
-   	name VARCHAR(10),
-   	sex VARCHAR(10)	
-   );
-   INSERT INTO student
-   VALUES
-   (1,'张三','男'),
-   (2,'李四','女'),
-   (3,'王五','男');
-
-4. | 编号 | 姓名 | 性别 |
-   | ---- | ---- | ---- |
-   | 1    | 张三 | 男   |
-   | 2    | 李四 | 女   |
-   | 3    | 王五 | 男   |
-
-6. 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. 
-
-   3. ```
-      import java.sql.*;
-      
-      public class Test02 {
-          public static void main(String[] args) {
-              ResultSet res = null;
-              Connection conn = null;
-              Statement smt = null;
-              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";
-                  conn = DriverManager.getConnection(url,usename,password);
-                  String sql = "select * from student";
-                   smt = conn.createStatement();
-                   res = smt.executeQuery(sql);
-                  while (res.next()){
-                      int id = res.getInt("id");
-                      String sex = res.getString("sex");
-                      String name = res.getString("name");
-                      System.out.println(id+"--"+name+"--"+sex);
-                  }
-              } catch (ClassNotFoundException e) {
-                  System.out.println("驱动异常");
-              } catch (SQLException s) {
-                  System.out.println("sql语句错误");
-                  s.printStackTrace();
-              }
-              try {
-                  if (res != null){
-                      res.close();
-                  }
-                  if (smt != null){
-                      smt.close();
-                  }
-                  if (conn != null){
-                      conn.close();
-                  }
-              } catch (SQLException e) {
-                  System.out.println("资源释放错误");
-                  e.printStackTrace();
-              }
-          }
-          
-      //    public static void main(String[] args) {
-      //        Class.forName("com.mysql.jdbc.Driver");
-      //        String url="jdbc:mysql://localhost:3306/student_db?useSSL=false&characterEncoding=utf8";
-      //        String usename="root";//数据库用户名
-      //        String password="root";//数据库密码
-      //        String sql = "select * from studen";
-      //        Connection conn = DriverManager.getConnection(url, usename, password);
-      //        Statement re =conn.createStatement();
-      //    }
-      }
-      ```
-
-   4. 添加功能
-
-   5. 
-
-   6. ```
-      Insert
-      public class Insert {
-          public static void main(String[] args) {
-              try {
-                  Class.forName("com.mysql.jdbc.Driver");
-                  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);
-                  String sql = "insert into student values (4,'王六','女')";
-                  Statement sta = conn.createStatement();
-                  int i = sta.executeUpdate(sql);
-                  if(i > 0){
-                      System.out.println("添加成功");
-                  }else {
-                      System.out.println("添加失败");
-                  }
-                  sta.close();
-                  conn.close();
-              } catch (ClassNotFoundException e) {
-                  System.out.println("驱动异常");
-              } catch (SQLException e) {
-                  System.out.println("sql语句错误");
-                  e.printStackTrace();
-              }
-          }
-      }
-      ```
-
-   7. 修改功能
-
-   8. 
-
-   9. ```
-      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");
-                  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);
-                  String sql = "update student set sex = '男' where name = '王六'";
-                  Statement sta = conn.createStatement();
-                  int i = sta.executeUpdate(sql);
-                  if(i > 0){
-                      System.out.println("修改成功");
-                  }else {
-                      System.out.println("修改失败");
-                  }
-                  sta.close();
-                  conn.close();
-              } catch (ClassNotFoundException e) {
-                  System.out.println("驱动异常");
-              } catch (SQLException e) {
-                  System.out.println("sql语句错误");
-                  e.printStackTrace();
-              }
-          }
-      }
-      ```
-
-   10. 删除功能
-
-   11. 
-
-   12. ```
-       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) {
-               try {
-                   Class.forName("com.mysql.jdbc.Driver");
-                   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);
-                   String sql = "delete from student where id = 4";
-                   Statement sta = conn.createStatement();
-                   int i = sta.executeUpdate(sql);
-                   if(i > 0){
-                       System.out.println("删除成功");
-                   }else {
-                       System.out.println("删除失败");
-                   }
-                   sta.close();
-                   conn.close();
-               } catch (ClassNotFoundException e) {
-                   System.out.println("驱动异常");
-               } catch (SQLException e) {
-                   System.out.println("sql语句错误");
-                   e.printStackTrace();
-               }
-           }
-       }
-       ```
-
-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
\ No newline at end of file
diff --git "a/14 \346\235\216\344\277\212\345\205\264/20230516JDBC\344\275\234\344\270\232.md" "b/14 \346\235\216\344\277\212\345\205\264/20230516JDBC\344\275\234\344\270\232.md"
deleted file mode 100644
index 128a5560b7060fbb537553b841243cf7a17c167d..0000000000000000000000000000000000000000
--- "a/14 \346\235\216\344\277\212\345\205\264/20230516JDBC\344\275\234\344\270\232.md"	
+++ /dev/null
@@ -1,244 +0,0 @@
-### 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
-
-1. 查讯类
-
-```java
-import java.net.ConnectException;
-import java.sql.*;
-
-public class Test {
-    public static void main(String[] args) {
-        extracted();
-    }
-
-    private static void extracted() {
-        ResultSet rst = null;
-        Statement smt = null;
-        Connection conn = null;
-        try {
-            //0 导包
-            //1 注册驱动
-            Class.forName("com.mysql.jdbc.Driver");
-            //2 获取连接对象
-            String url = "jdbc:mysql://localhost:3306/student_db?useSSL=false&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 对象
-            smt = conn.createStatement();
-            //5 执行SQL
-            rst = smt.executeQuery(sql);
-            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("没有成功导入包，请正确导入");
-        } catch (SQLException e) {
-            System.out.println("sql语句错误");
-            e.printStackTrace();
-        } finally {
-            try {
-                // 7 释放资源
-                rst.close();
-                smt.close();
-                conn.close();
-            } catch (SQLException e) {
-                System.out.println("资源释放异常");
-            }
-        }
-    }
-}
-
-```
-
-2. 插入类
-
-```java
-import java.sql.Connection;
-import java.sql.DriverManager;
-import java.sql.SQLException;
-import java.sql.Statement;
-
-public class insert {
-    public static void main(String[] args) {
-        Statement smt = null;
-        Connection conn = null;
-        try {
-            //0 导包
-            //1 注册驱动
-            Class.forName("com.mysql.jdbc.Driver");
-            //2 获取连接对象
-            String url = "jdbc:mysql://localhost:3306/student_db?useSSL=false&characterEncoding=utf8";
-            String username = "root";
-            String password = "root";
-            conn = DriverManager.getConnection(url, username, password);
-            //3 SQL 语句
-            String sql = "INSERT INTO student VALUES\n(3,'强强','男')";
-            //4 获取执行
-            smt = conn.createStatement();
-            //5 执行sql
-            int i = smt.executeUpdate(sql);
-            //6 处理返回问题
-            if (i > 0) {
-                System.out.println("插入成功");
-            } else {
-                System.out.println("没有插入数据哦！请检查");
-            }
-
-        } catch (ClassNotFoundException e) {
-            System.out.println("没有成功导入包，请正确导入");
-        } catch (SQLException e) {
-            System.out.println("sql语句错误");
-        } finally {
-            //7 释放
-            try {
-                smt.close();
-                conn.close();
-            } catch (SQLException e) {
-                throw new RuntimeException(e);
-            }
-        }
-    }
-}
-
-```
-
-3. 修改类
-
-~~~java
-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) {
-        Connection conn = null;
-        Statement smt = null;
-        try {
-            //0 导包
-            //1 注册驱动
-            Class.forName("com.mysql.jdbc.Driver");
-            //2 获取连接对象
-            String url = "jdbc:mysql://localhost:3306/student_db?useSSL=false&characterEncoding=utf8";
-            String username = "root";
-            String password = "root";
-            conn = DriverManager.getConnection(url, username, password);
-            //3 编写SQL语句
-            String sql = "UPDATE student SET NAME = '李小青' WHERE id = 2";
-            //4 获取执行 SQL 对象
-            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("成功修改了"+i+"行");
-            }else {
-                System.out.println("成功修改了"+i+"行");
-                System.out.println("没有改变");
-            }
-        } catch (ClassNotFoundException e) {
-            throw new RuntimeException(e);
-        } catch (SQLException e) {
-            throw new RuntimeException(e);
-        }finally {
-            // 7 释放资源
-            try {
-                smt.close();
-                conn.close();
-            } catch (SQLException e) {
-                throw new RuntimeException(e);
-            }
-        }
-
-
-    }
-}
-
-~~~
-
-4. 删除类
-
-```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) {
-        Statement stm = null;
-        Connection conn = null;
-        try {
-            //0 导包
-            //1 注册驱动
-            Class.forName("com.mysql.jdbc.Driver");
-            //2 获取连接对象
-            String url = "jdbc:mysql://localhost:3306/student_db?useSSL=false&characterEncoding=utf8";
-            String username = "root";
-            String password = "root";
-            conn = DriverManager.getConnection(url, username, password);
-            //3 编写SQL语句
-            String sql = "DELETE FROM student WHERE id=3";
-            //4 获取执行
-            stm = conn.createStatement();
-            //5 执行sql语句
-            int i = stm.executeUpdate(sql);
-            //6 处理返回结果
-            if (i > 0) {
-                System.out.println("成功删除" + i + "行");
-                System.out.println("删除成功");
-            } else {
-                System.out.println("成功删除" + i + "行");
-                System.out.println("删除失败");
-            }
-
-        } catch (ClassNotFoundException e) {
-            System.out.println("没有成功导入包，请正确导入");
-        } catch (SQLException e) {
-            System.out.println("sql语句错误");
-        } finally {
-            //7 释放
-            try {
-                stm.close();
-                conn.close();
-            } catch (SQLException e) {
-                throw new RuntimeException(e);
-            }
-        }
-    }
-}
-
-```
-
diff --git "a/18 \345\276\220\346\260\270\346\267\263/20230517 JSP+Servlet JDBC\344\275\234\344\270\232.md" "b/18 \345\276\220\346\260\270\346\267\263/20230517 JSP+Servlet JDBC\344\275\234\344\270\232.md"
deleted file mode 100644
index 089646f4d4c254d8a9414e86973d575a72a7f4aa..0000000000000000000000000000000000000000
--- "a/18 \345\276\220\346\260\270\346\267\263/20230517 JSP+Servlet JDBC\344\275\234\344\270\232.md"	
+++ /dev/null
@@ -1,195 +0,0 @@
-### 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
-
-```mysql
-create database student_db charset utf8;
-use student_db;
-create table student(
-id int,
-name varchar(50),
-sex VARCHAR(50)
-);
-insert into student VALUES
-(1,'张三',"男"),
-(2,'李四','女'),
-(3,'王五','男');
-```
-
-
-
-```java
-select类
-    import java.sql.*;
-
-public class select {
-    public static void main(String[] args) {
-        ResultSet re=null;
-        Statement st=null;
-        Connection con=null;
-        try {
-            Class.forName("com.mysql.jdbc.Driver");
-            con = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?useSSL=false&characterEncoding=utf8", "root", "root");
-            String sql = "select * from student";
-            st = con.createStatement();
-            re = st.executeQuery(sql);
-            while (re.next()){
-                int id = re.getInt("id");
-                String name = re.getString("name");
-                String sex = re.getString("sex");
-                System.out.println(id + "\t" + name + "\t" + sex);
-
-
-            }
-        } catch (ClassNotFoundException e) {
-            System.out.println("驱动包错误");
-        } catch (SQLException e) {
-            System.out.println("运行错误");
-        } finally {
-            try {
-                if(re!=null){
-                    re.close();
-                }
-                if(st!=null){
-                    st.close();
-                }
-                if(con!=null){
-                    con.close();
-                }
-            } catch (SQLException e) {
-                e.printStackTrace();
-                System.out.println("资源释放异常");
-            }
-        }
-
-    }
-}
-```
-
-```java
-insert类
-    import java.sql.Connection;
-import java.sql.DriverManager;
-import java.sql.SQLException;
-import java.sql.Statement;
-
-public class insert {
-    public static void main(String[] args) {
-        try {
-            Class.forName("com.mysql.jdbc.Driver");
-            Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?useSSL=false&characterEncoding=utf8", "root", "root");
-            String sql = "insert into student values (4,'黒姫結灯','女')";
-            Statement st = con.createStatement();
-            int i = st.executeUpdate(sql);
-
-            if(i>0){
-                System.out.println("成功插入"+i+"行");
-                System.out.println("插入成功");
-            }else{
-                System.out.println("成功插入"+i+"行");
-                System.out.println("插入失败");
-            }
-        } catch (ClassNotFoundException e) {
-            System.out.println("驱动包错误");
-        } catch (SQLException e) {
-            e.printStackTrace();
-            System.out.println("运行错误");
-        }
-
-
-    }
-}
-
-```
-
-```java
-delete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) {
-        try {
-            Class.forName("com.mysql.jdbc.Driver");
-            Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?useSSL=false&characterEncoding=utf8", "root", "root");
-            String sql = "delete from student where name='黒姫結灯'";
-            Statement st = con.createStatement();
-            int i = st.executeUpdate(sql);
-
-            if(i>0){
-                System.out.println("成功删除"+i+"行");
-                System.out.println("删除成功");
-            }else{
-                System.out.println("成功删除"+i+"行");
-                System.out.println("=删除失败");
-            }
-        } catch (ClassNotFoundException e) {
-            System.out.println("运行包错误");
-        } catch (SQLException e) {
-            e.printStackTrace();
-            System.out.println("运行错误");
-        }
-    }
-}
-
-```
-
-```java
-update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");
-            Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?useSSL=false&characterEncoding=utf8", "root", "root");
-            String sql = "update student set name='一之濑穗波',sex='女' where id=1";
-            String sqls="update student set name='砚川·e·泪香' where id=2";
-            String ssql="update student set name='冰见山玲',sex='女' where id=3";
-            Statement st = con.createStatement();
-            int i = st.executeUpdate(sqls);
-            if(i>0){
-                System.out.println("成功修改"+i+"行");
-                System.out.println("修改成功");
-            }else {
-                System.out.println("成功修改"+i+"行");
-                System.out.println("修改失败");
-            }
-        } catch (ClassNotFoundException e) {
-            System.out.println("驱动包错误");
-        } catch (SQLException e) {
-            e.printStackTrace();
-            System.out.println("运行错误");
-        }
-    }
-}
-
-```
-
diff --git "a/20 \347\237\263\350\211\257\346\266\233/20230516JSP\347\254\254\344\270\200\346\254\241\344\275\234\344\270\232.md" "b/20 \347\237\263\350\211\257\346\266\233/20230516JSP\347\254\254\344\270\200\346\254\241\344\275\234\344\270\232.md"
deleted file mode 100644
index 0267630e5f2b47626855265d31de028db825c316..0000000000000000000000000000000000000000
--- "a/20 \347\237\263\350\211\257\346\266\233/20230516JSP\347\254\254\344\270\200\346\254\241\344\275\234\344\270\232.md"	
+++ /dev/null
@@ -1,119 +0,0 @@
-## 1. 作业
-
-### 创建数据库：
-
-```sql
-CREATE DATABASE student_db;
-```
-
-### 选择数据库：
-
-```sql
-USE student_db;
-
-```
-
-### 创建student表：
-
-```sql
-CREATE TABLE student (
-  编号 INT PRIMARY KEY,
-  姓名 VARCHAR(50),
-  性别 VARCHAR(10)
-);
-
-```
-
-### 插入数据：
-
-```sql
-INSERT INTO student (编号, 姓名, 性别) VALUES
-(1, '张三', '男'),
-(2, '李四', '女'),
-(3, '王五', '男');
-
-```
-
-### JAVA
-
-```java
-import java.sql.*;
-
-public class StudentDatabase {
-    private Connection connection;
-    private Statement statement;
-
-    public StudentDatabase() {
-        try {
-            // 连接到MySQL数据库
-            connection = DriverManager.getConnection("jdbc:mysql://localhost/student_db", "用户名", "密码");
-            statement = connection.createStatement();
-        } catch (SQLException e) {
-            e.printStackTrace();
-        }
-    }
-
-    // 查询功能，查询student表中所有数据
-    public void queryStudents() {
-        try {
-            ResultSet resultSet = statement.executeQuery("SELECT * FROM student");
-            while (resultSet.next()) {
-                int id = resultSet.getInt("编号");
-                String name = resultSet.getString("姓名");
-                String gender = resultSet.getString("性别");
-                System.out.println("编号: " + id + ", 姓名: " + name + ", 性别: " + gender);
-            }
-        } catch (SQLException e) {
-            e.printStackTrace();
-        }
-    }
-
-    // 添加功能，向student表中添加一条数据
-    public void addStudent(int id, String name, String gender) {
-        try {
-            String query = "INSERT INTO student (编号, 姓名, 性别) VALUES (" + id + ", '" + name + "', '" + gender + "')";
-            statement.executeUpdate(query);
-            System.out.println("已添加学生信息");
-        } catch (SQLException e) {
-            e.printStackTrace();
-        }
-    }
-
-    // 修改功能，修改student表中指定学生的数据
-    public void updateStudent(int id, String newName, String newGender) {
-        try {
-            String query = "UPDATE student SET 姓名 = '" + newName + "', 性别 = '" + newGender + "' WHERE 编号 = " + id;
-            statement.executeUpdate(query);
-            System.out.println("已更新学生信息");
-        } catch (SQLException e) {
-            e.printStackTrace();
-        }
-    }
-
-    // 删除功能，删除student表中指定学生的数据
-    public void deleteStudent(int id) {
-        try {
-            String query = "DELETE FROM student WHERE 编号 = " + id;
-            statement.executeUpdate(query);
-            System.out.println("已删除学生信息");
-        } catch (SQLException e) {
-            e.printStackTrace();
-        }
-    }
-
-    public static void main(String[] args) {
-        StudentDatabase studentDB = new StudentDatabase();
-        studentDB.queryStudents(); // 查询所有学生信息
-
-        studentDB.addStudent(4, "赵六", "女"); // 添加学生信息
-        studentDB.queryStudents();
-
-        studentDB.updateStudent(3, "王五", "女"); // 修改学生信息
-        studentDB.queryStudents();
-
-        studentDB.deleteStudent(2); // 删除学生信息
-        studentDB.queryStudents();
-    }
-}
-
-```
diff --git "a/22 \350\202\226\351\222\237\345\207\257\351\237\251/20230517 JDBS\344\275\234\344\270\232.md" "b/22 \350\202\226\351\222\237\345\207\257\351\237\251/20230517 JDBS\344\275\234\344\270\232.md"
deleted file mode 100644
index 00dc2705c2b5d4ec4ad4b4dc196b9f36fa76fdc5..0000000000000000000000000000000000000000
--- "a/22 \350\202\226\351\222\237\345\207\257\351\237\251/20230517 JDBS\344\275\234\344\270\232.md"	
+++ /dev/null
@@ -1,215 +0,0 @@
-### 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
\ No newline at end of file
diff --git "a/40 \346\227\266\345\255\246\345\256\211/JDBC\344\275\234\344\270\232\357\274\232.md" "b/40 \346\227\266\345\255\246\345\256\211/JDBC\344\275\234\344\270\232\357\274\232.md"
deleted file mode 100644
index b331d9349d0b3c26e7be715e85febc525c73cc4f..0000000000000000000000000000000000000000
--- "a/40 \346\227\266\345\255\246\345\256\211/JDBC\344\275\234\344\270\232\357\274\232.md"	
+++ /dev/null
@@ -1,201 +0,0 @@
-### JDBC作业：
-
-1. MySQL中创建一个数据库student_db
-
-   ~~~ sql
-   CREATE database student_db charset utf8;
-   use student_db;
-   ~~~
-
-   
-
-2. 库中创建student表
-
-   ~~~ sql
-   CREATE TABLE student(
-   id int,
-   name varchar(20),
-   sex char
-   );
-   ~~~
-
-   
-
-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   |
-
-   ~~~ sql
-   INSERT into student VALUES(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
-
-      ~~~ JAVA
-      import java.sql.*;
-      
-      public class Select {
-          public static void main(String[] args) {
-              Connection conn=null;
-              Statement sta=null;
-              ResultSet res=null;
-              try {
-                  Class.forName("com.mysql.jdbc.Driver");
-                  String url="jdbc:mysql://localhost:3306/student_db?useSSL=false";
-                  String username="root";
-                  String password="root";
-                   conn = DriverManager.getConnection(url, username, password);
-                  String sql="select * from student";
-                   sta = conn.createStatement();
-                   res = sta.executeQuery(sql);
-                  while (res.next()){
-                      int id = res.getInt("id");
-                      String name=res.getString("name");
-                      String sex=res.getString("sex");
-                      System.out.println(id+"-"+name+"-"+sex);
-                  }
-      
-              } catch (ClassNotFoundException e) {
-                  System.out.println("驱动包错误");
-                  e.printStackTrace();
-              } catch (SQLException e) {
-                  System.out.println("sql错误");
-                  e.printStackTrace();
-              }
-              try {
-                  if (res!=null){
-                  res.close();}
-                  if (sta!=null){
-                  sta.close();}
-                  if(conn!=null){
-                  conn.close();}
-              } catch (Exception e) {
-                  System.out.println("释放异常");
-              }
-      
-          }
-      }
-      ~~~
-
-   2. 添加功能
-
-      ~~~ java
-      import java.sql.*;
-      
-      public class insert {
-          public static void main(String[] args) {
-      
-      
-              try {
-                  Class.forName("com.mysql.jdbc.Driver");
-                  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);
-                  String sql="insert into student values(4,'小李','女')";
-                  Statement sta = conn.createStatement();
-                  int i = sta.executeUpdate(sql);
-                  if (i>0){
-                      System.out.println("添加成功");
-                  }else {
-                      System.out.println("添加失败");
-                  }
-      
-              } catch (ClassNotFoundException e) {
-                  System.out.println("驱动包错误");
-              } catch (SQLException e) {
-                  System.out.println("sql错误");
-              }
-      
-      
-          }
-      }
-      
-      ~~~
-      
-   3. 修改功能
-   
-      ~~~ java
-      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");
-                  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);
-                  String sql="update student set name='小李子' where id=4";
-                  Statement sta = conn.createStatement();
-                  int i = sta.executeUpdate(sql);
-                  if (i>0){
-                      System.out.println("修改成功");
-                  }else {
-                      System.out.println("修改失败");
-                  }
-      
-              } catch (ClassNotFoundException e) {
-                  System.out.println("驱动包错误");
-              } catch (SQLException e) {
-                  System.out.println("sql错误");
-              }
-          }
-      }
-      
-      ~~~
-      
-      
-      
-   4. 删除功能
-   
-      ~~~ 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) {
-              try {
-                  Class.forName("com.mysql.jdbc.Driver");
-                  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);
-                  String sql="delete from student where name='小李子'";
-                  Statement sta = conn.createStatement();
-                  int i = sta.executeUpdate(sql);
-                  if (i>0){
-                      System.out.println("删除成功");
-                  }else {
-                      System.out.println("删除失败");
-                  }
-      
-              } catch (ClassNotFoundException e) {
-                  System.out.println("驱动包错误");
-              } catch (SQLException e) {
-                  System.out.println("sql错误");
-              }
-          }
-      }
-      
-      ~~~
-      
-      
-   
-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
\ No newline at end of file
diff --git "a/51 \347\250\213\350\210\234/20230517 JDBC\344\275\234\344\270\232.md" "b/51 \347\250\213\350\210\234/20230517 JDBC\344\275\234\344\270\232.md"
deleted file mode 100644
index de0f3a3f8683b2d0abfce820cc1b4280ce8ffd3c..0000000000000000000000000000000000000000
--- "a/51 \347\250\213\350\210\234/20230517 JDBC\344\275\234\344\270\232.md"	
+++ /dev/null
@@ -1,196 +0,0 @@
-### 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   |
-
-   ```mysql
-   create database student_db charset utf8;
-   use student_db;
-   create table student (
-   	id int,
-   	name varchar(10),
-   	sex char
-   );
-   insert into student values
-   (1,'张三','男'),
-   (2,'李四','女'),
-   (3,'王五','男');
-   
-   select * from student;
-   ```
-
-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
-
-      ```javascript
-      import java.sql.*;
-      
-      public class Select {
-          public static void main(String[] args) {
-              Connection conn = null;
-              Statement sta = null;
-              ResultSet res = null;
-              try {
-                  Class.forName("com.mysql.jdbc.Driver");
-                  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);
-                  String sql = "select * from student";
-                  sta = conn.createStatement();
-                  res = sta.executeQuery(sql);
-                  while (res.next()){
-                      int id = res.getInt("id");
-                      String name = res.getString("name");
-                      String sex = res.getString("sex");
-                      System.out.println(id+"--"+name+"--"+sex);
-                  }
-              } catch (ClassNotFoundException e) {
-                  System.out.println("驱动异常");
-              } catch (SQLException e) {
-                  System.out.println("sql语句错误");
-                  e.printStackTrace();
-              }finally {
-                  try {
-                      if (res != null){
-                          res.close();
-                      }
-                      if (sta != null){
-                          sta.close();
-                      }
-                      if (conn != null){
-                          conn.close();
-                      }
-                  } catch (SQLException e) {
-                      System.out.println("资源释放错误");
-                      e.printStackTrace();
-                  }
-              }
-          }
-      }
-      ```
-
-   2. 添加功能
-
-      ```javascript
-      import java.sql.Connection;
-      import java.sql.DriverManager;
-      import java.sql.SQLException;
-      import java.sql.Statement;
-      
-      public class Insert {
-          public static void main(String[] args) {
-              try {
-                  Class.forName("com.mysql.jdbc.Driver");
-                  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);
-                  String sql = "insert into student values (4,'王六','女')";
-                  Statement sta = conn.createStatement();
-                  int i = sta.executeUpdate(sql);
-                  if(i > 0){
-                      System.out.println("添加成功");
-                  }else {
-                      System.out.println("添加失败");
-                  }
-                  sta.close();
-                  conn.close();
-              } catch (ClassNotFoundException e) {
-                  System.out.println("驱动异常");
-              } catch (SQLException e) {
-                  System.out.println("sql语句错误");
-                  e.printStackTrace();
-              }
-          }
-      }
-      ```
-
-   3. 修改功能
-
-      ```javascript
-      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");
-                  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);
-                  String sql = "update student set sex = '男' where name = '王六'";
-                  Statement sta = conn.createStatement();
-                  int i = sta.executeUpdate(sql);
-                  if(i > 0){
-                      System.out.println("修改成功");
-                  }else {
-                      System.out.println("修改失败");
-                  }
-                  sta.close();
-                  conn.close();
-              } catch (ClassNotFoundException e) {
-                  System.out.println("驱动异常");
-              } catch (SQLException e) {
-                  System.out.println("sql语句错误");
-                  e.printStackTrace();
-              }
-          }
-      }
-      ```
-
-   4. 删除功能
-
-      ```javascript
-      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) {
-              try {
-                  Class.forName("com.mysql.jdbc.Driver");
-                  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);
-                  String sql = "delete from student where id = 4";
-                  Statement sta = conn.createStatement();
-                  int i = sta.executeUpdate(sql);
-                  if(i > 0){
-                      System.out.println("删除成功");
-                  }else {
-                      System.out.println("删除失败");
-                  }
-                  sta.close();
-                  conn.close();
-              } catch (ClassNotFoundException e) {
-                  System.out.println("驱动异常");
-              } catch (SQLException e) {
-                  System.out.println("sql语句错误");
-                  e.printStackTrace();
-              }
-          }
-      }
-      ```
-
-   
-
-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
\ No newline at end of file
diff --git "a/54 \345\217\266\345\255\220\350\261\252/JSP\344\275\234\344\270\232.md" "b/54 \345\217\266\345\255\220\350\261\252/JSP\344\275\234\344\270\232.md"
deleted file mode 100644
index 3fb13e9fecce3123f668c3f3f388c34371b64a04..0000000000000000000000000000000000000000
--- "a/54 \345\217\266\345\255\220\350\261\252/JSP\344\275\234\344\270\232.md"	
+++ /dev/null
@@ -1,187 +0,0 @@
-MySQL中创建一个数据库student_db
-
-库中创建student表
-
-1. 表中数据如下
-
-2. | 编号 | 姓名 | 性别 |
-   | ---- | ---- | ---- |
-   | 1    | 张三 | 男   |
-   | 2    | 李四 | 女   |
-   | 3    | 王五 | 男   |
-
-```mysql
-CREATE database student_db charset utf8;
-use student_db;
-CREATE TABLE student(
-id int,
-`name` varchar(20),
-sex char
-);
-INSERT into student VALUES(1,"张三","男"),(2,"李四","女"),(3,"王五","男");
-```
-
-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
-
-```java
-import java.sql.*;
-
-public class Test1 {
-    public static void main(String[] args) {
-        Connection conn=null;
-        Statement sta=null;
-        ResultSet res=null;
-        try {
-            Class.forName("com.mysql.jdbc.Driver");
-            String url="jdbc:mysql://localhost:3306/student_db?useSSL=false";
-            String username="root";
-            String password="root";
-             conn = DriverManager.getConnection(url, username, password);
-            String sql="select * from student";
-             sta = conn.createStatement();
-             res = sta.executeQuery(sql);
-            while (res.next()){
-                int id = res.getInt("id");
-                String name=res.getString("name");
-                String sex=res.getString("sex");
-                System.out.println(id+"-"+name+"-"+sex);
-            }
-
-        } catch (ClassNotFoundException e) {
-            System.out.println("驱动包导入错误");
-            e.printStackTrace();
-        } catch (SQLException e) {
-            System.out.println("语法错误");
-            e.printStackTrace();
-        }
-        try {
-            if (res!=null){
-            res.close();}
-            if (sta!=null){
-            sta.close();}
-            if(conn!=null){
-            conn.close();}
-        } catch (Exception e) {
-            System.out.println("资源释放异常");
-        }
-
-    }
-}
-```
-
-```java
-import java.sql.*;
-
-public class Test2{
-    public static void main(String[] args) {
-
-
-        try {
-            Class.forName("com.mysql.jdbc.Driver");
-            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);
-            String sql="insert into student values(4,'子豪','男')";
-            Statement sta = conn.createStatement();
-            int i = sta.executeUpdate(sql);
-            if (i>0){
-                System.out.println("添加成功");
-            }else {
-                System.out.println("失败");
-            }
-
-            sta.close();
-            conn.close();
-
-        } catch (ClassNotFoundException e) {
-            System.out.println("驱动包导入错误");
-        } catch (SQLException e) {
-            System.out.println("语法错误");
-        }
-
-
-    }
-}
-
-```
-
-```java
-import java.sql.Connection;
-import java.sql.DriverManager;
-import java.sql.SQLException;
-import java.sql.Statement;
-
-public class Test3{
-    public static void main(String[] args) {
-        try {
-            Class.forName("com.mysql.jdbc.Driver");
-            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);
-            String sql="update student set name='叶子豪' where id=4";
-            Statement sta = conn.createStatement();
-            int i = sta.executeUpdate(sql);
-            if (i>0){
-                System.out.println("修改成功");
-            }else {
-                System.out.println("修改失败");
-            }
-
-            sta.close();
-            conn.close();
-
-        } catch (ClassNotFoundException e) {
-            System.out.println("驱动包导入错误");
-        } catch (SQLException e) {
-            System.out.println("语法错误");
-        }
-    }
-}
-
-```
-
-```java
-import java.sql.Connection;
-import java.sql.DriverManager;
-import java.sql.SQLException;
-import java.sql.Statement;
-
-public class Test4 {
-    public static void main(String[] args) {
-        try {
-            Class.forName("com.mysql.jdbc.Driver");
-            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);
-            String sql="delete from student where id=4";
-            Statement sta = conn.createStatement();
-            int i = sta.executeUpdate(sql);
-            if (i>0){
-                System.out.println("删除成功");
-            }else {
-                System.out.println("删除失败");
-            }
-
-            sta.close();
-            conn.close();
-
-        } catch (ClassNotFoundException e) {
-            System.out.println("驱动包导入错误");
-        } catch (SQLException e) {
-            System.out.println("语法错误");
-        }
-    }
-}
-
-```
-
diff --git "a/\346\225\260\346\215\256\345\272\223.md" "b/\346\225\260\346\215\256\345\272\223.md"
new file mode 100644
index 0000000000000000000000000000000000000000..6eb4f382c4cdb647112b653915642d8fb6a1ba18
--- /dev/null
+++ "b/\346\225\260\346\215\256\345\272\223.md"
@@ -0,0 +1,147 @@
+```java
+
+import java.sql.*;
+import java.util.Scanner;
+
+public class Data {
+    public static void main(String[] args) {
+        while (true) {
+            Scanner scanner = new Scanner(System.in);
+            System.out.println("请输入你想要的功能:(1、查询所有数据 2、添加数据 3、修改数据 4、删除数据 5、退出)");
+            int num = scanner.nextInt();
+            switch (num) {
+                case 1:
+                    new Select().select();
+                    break;
+                case 2:
+                    new Add().add();
+                    break;
+                case 3:
+                    new Updata().updata();
+                    break;
+                case 4:
+                    new Delect().delect();
+                    break;
+            }
+            if (num == 5) {
+                break;
+            }
+        }
+    }
+
+    static class Select {
+        void select() {
+            Connection conn = null;
+            Statement stmt = null;
+            ResultSet rs = null;
+
+            try {
+
+                String user = "root";
+                String pwd = "xflovexz";
+                // 加载MySQL驱动类
+                Class.forName("com.mysql.jdbc.Driver");
+
+                // 创建连接
+                conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?Unicode=true&characterEncoding=utf8&useSSL=false&allowPublicKeyRetrieval=true", user, pwd);
+
+                // 创建Statement对象
+                stmt = conn.createStatement();
+
+                // 执行查询操作
+                rs = stmt.executeQuery("SELECT * FROM sutdent");
+
+                // 遍历结果集
+                while (rs.next()) {
+                    System.out.println(rs.getInt("id") + "\t" + rs.getString("name") + "\t" + rs.getString("gender"));
+                }
+            } catch (ClassNotFoundException e) {
+                e.printStackTrace();
+            } catch (SQLException e) {
+                e.printStackTrace();
+            } finally {
+                // 释放资源
+                try {
+                    if (rs != null) {
+                        rs.close();
+                    }
+                    if (stmt != null) {
+                        stmt.close();
+                    }
+                    if (conn != null) {
+                        conn.close();
+                    }
+                } catch (SQLException e) {
+                    e.printStackTrace();
+                }
+            }
+        }
+    }
+
+    public static class Add {
+        void add() {
+            try {
+                String user = "root";
+                String pwd = "xflovexz";
+                Class.forName("com.mysql.jdbc.Driver");
+                Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?Unicode=true&characterEncoding=utf8&useSSL=false&allowPublicKeyRetrieval=true", user, pwd);
+                Statement statement = connection.createStatement();
+                int resultSet = statement.executeUpdate("insert into sutdent values (4,'小明','男')");
+                if (pwd != null) {
+                    System.out.println("添加成功");
+                } else {
+                    System.out.println("添加失败");
+                }
+            } catch (ClassNotFoundException e) {
+                throw new RuntimeException(e);
+            } catch (SQLException e) {
+                throw new RuntimeException(e);
+            }
+        }
+    }
+
+    public static class Updata {
+        void updata() {
+            try {
+                String user = "root";
+                String pwd = "xflovaxz";
+                Connection connection = DriverManager.getConnection("jdbc:mysql:///student_db?Unicode=true&characterEncoding=utf8&useSSL=false&allowPublicKeyRetrieval=true", user, pwd);
+                Statement statement = connection.createStatement();
+                int resultSet = statement.executeUpdate("update sutdent set name='小明' where id=2");
+                if (pwd != null) {
+                    System.out.println("修改成功");
+                } else {
+                    System.out.println("修改失败");
+                }
+            } catch (SQLException e) {
+                throw new RuntimeException(e);
+            }
+        }
+    }
+
+
+    public static class Delect {
+        void delect() {
+            try {
+                String user = "root";
+                String pwd = "xflovexz";
+                Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?Unicode=true&characterEncoding=utf8&useSSL=false&allowPublicKeyRetrieval=true", user, pwd);
+                Statement statement = connection.createStatement();
+                int resultSet = statement.executeUpdate("delete from sutdent where id=4 ");
+                if (pwd != null) {
+                    System.out.println("删除成功");
+                } else {
+                    System.out.println("删除失败");
+                }
+            } catch (SQLException e) {
+                throw new RuntimeException(e);
+            }
+        }
+    }
+
+
+}
+
+
+```
+