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+# JSP
+
+###  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   |
+
+   ```java
+   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
+
+      ```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&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
+
+      ```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) {
+              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
+
+      ```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 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
+
+      ```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 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
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