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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
+
+      ```java
+      import org.omg.CORBA.UserException;
+      
+      import java.sql.*;
+      public class Select {
+          public static void main(String[] args) {
+              try {
+                  //注册
+                  Class.forName("com.mysql.jdbc.Driver");
+                  //获取连接
+                  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 = "select *from student";
+                  //获取对象
+                  Statement st = conn.createStatement();
+                  //执行
+                  ResultSet re = st.executeQuery(sql);
+                  //处理
+                  while (re.next()){
+                      int id = re.getInt(1);
+                      String name = re.getString(2);
+                      String sex = re.getString(3);
+                      System.out.println(id + name + sex );
+                  }
+                  //释放
+                  re.close();
+      
+      */
+                  st.close();
+                  conn.close();
+              } catch (ClassNotFoundException e) {
+                  throw new RuntimeException(e);
+              } catch (SQLException e) {
+                  throw new RuntimeException(e);
+              }
+          }
+      }
+      
+      ```
+
+      ​								
+
+   2. 添加功能
+
+      ```java
+      import org.omg.CORBA.UserException;
+      
+      import java.sql.*;
+      public class Add {
+          public static void main(String[] args) {
+              try {
+                  //注册
+                  Class.forName("com.mysql.jdbc.Driver");
+                  //获取连接
+                  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(null,'六留',2)";
+                  Statement st = conn.createStatement();
+                  int i = st.executeUpdate(sql);
+                  if (i>0){
+                      System.out.println("增加了" + i + "行");
+                  } else{
+                      System.out.println("错误");
+                  }
+                  st.close();
+                  conn.close();
+              } catch (ClassNotFoundException e) {
+                  throw new RuntimeException(e);
+              } catch (SQLException e) {
+                  throw new RuntimeException(e);
+              }
+          }
+      }
+      ```
+
+      
+
+   3. 修改功能
+
+      ```java
+      import org.omg.CORBA.UserException;
+      
+      import java.sql.*;
+      public class Update {
+          public static void main(String[] args) {
+              try {
+                  //注册
+                  Class.forName("com.mysql.jdbc.Driver");
+                  //获取连接
+                  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 id = 4 ";
+                  Statement st = conn.createStatement();
+                  int i = st.executeUpdate(sql);
+                  if (i>0){
+                      System.out.println("修改了" + i + "行");
+                  } else{
+                      System.out.println("错误");
+                  }
+                  st.close();
+                  conn.close();
+              } catch (ClassNotFoundException e) {
+                  throw new RuntimeException(e);
+              } catch (SQLException e) {
+                  throw new RuntimeException(e);
+              }
+          }
+      }
+      ```
+
+      
+
+   4. 删除功能
+
+      ```java
+      import org.omg.CORBA.UserException;
+      
+      import java.sql.*;
+      public class Delete {
+          public static void main(String[] args) {
+              try {
+                  //注册
+                  Class.forName("com.mysql.jdbc.Driver");
+                  //获取连接
+                  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 st = conn.createStatement();
+                  int i = st.executeUpdate(sql);
+                  if (i>0){
+                      System.out.println("删除了" + i + "行");
+                  } else{
+                      System.out.println("错误");
+                  }
+            		st.close();
+                  conn.close();
+              } catch (ClassNotFoundException e) {
+                  throw new RuntimeException(e);
+              } catch (SQLException e) {
+                  throw new RuntimeException(e);
+              }
+          }
+      }       
+      ```
+
+      
+
+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
+   
+      
+      
+      
+
+
+
+
+