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+### JDBC作业：
+
+1. MySQL中创建一个数据库student_db
+
+2. 库中创建student表
+
+3. 表中数据如下
+
+4. | 编号 | 姓名 | 性别 |
+   | ---- | ---- | ---- |
+   | 1    | 张三 | 男   |
+   | 2    | 李四 | 女   |
+   | 3    | 王五 | 男   |
+
+5. 编写java 4个类，分别实现以下功能
+
+   1. 查询功能，查询student中所有数据
+   2. 添加功能
+   3. 修改功能
+   4. 删除功能
+
+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
+-- 创建数据库
+CREATE DATABASE student_db charset utf8;
+-- 使用数据库
+use student_db;
+-- 创建表格
+CREATE table student (
+id int,
+name VARCHAR(12),
+sex VARCHAR(12)
+);
+-- 插入数据
+INSERT into student VALUES
+(1,'张三','男'),
+(2,'李四','女'),
+(3,'王五','男');
+-- 查询所有
+SELECT * from student;
+```
+
+查询功能，查询student中所有数据
+
+```java
+package Topic1;
+
+import java.sql.*;
+
+public class A1 {
+    public static void main(String[] args) {
+        Connection a = null;
+        Statement b = null;
+        ResultSet c = 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";
+            a = DriverManager.getConnection(url, username, password);
+            String sql = "select * from student";
+            b = a.createStatement();
+            c = b.executeQuery(sql);
+            while (c.next()){
+                int id = c.getInt("id");
+                String name =c.getString("name");
+                String sex = c.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！");
+        }
+        finally{
+            try {
+                c.close();
+                b.close();
+                a.close();
+            } catch (SQLException e) {
+                throw new RuntimeException(e);
+            }
+        }
+    }
+}
+```
+
+添加功能
+
+```java
+package Topic1;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.sql.Statement;
+
+public class A2 {
+    public static void main(String[] args) {
+        Connection a = null;
+        Statement b = 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";
+            a = DriverManager.getConnection(url, username, password);
+            String sql="insert into student values(4,'赵六','男')";
+            //获取
+            b = a.createStatement();
+            //添加
+            int i = b.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("驱动包没有正确导入，请检查");
+        } catch (SQLException e) {
+            System.out.println("sql语句执行错误！");
+        }
+        try {
+            a.close();
+            b.close();
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}
+```
+
+修改功能
+
+```java
+package Topic1;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.sql.Statement;
+public class A3 {
+    public static void main(String[] args) {
+        Connection a = null;
+        Statement b = 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";
+            a = DriverManager.getConnection(url, username, password);
+            String sql="update student set sex='女' where name='赵六'";
+            //获取
+            b = a.createStatement();
+            //修改
+            int i = b.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("驱动包没有正确导入，请检查");
+        } catch (SQLException e) {
+            System.out.println("sql语句执行错误！");
+        }
+        try {
+            a.close();
+            b.close();
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}
+```
+
+删除功能
+
+```java
+package Topic1;
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.sql.Statement;
+public class A4 {
+    public static void main(String[] args) {
+        Connection a = null;
+        Statement b = 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";
+            a = DriverManager.getConnection(url, username, password);
+            String sql="delete from student where name='王五'";
+            //获取
+            b = a.createStatement();
+            //删除
+            int i = b.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("驱动包没有正确导入，请检查");
+        } catch (SQLException e) {
+            System.out.println("sql语句执行错误！");
+        }
+        try {
+            a.close();
+            b.close();
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}
+```
+