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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
+      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
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