1.lombok的使用

2.Spring-mybatis-增删改查准备工作

springboot-mybatis-quickstart/pom.xml

@@ -44,6 +44,18 @@
             <artifactId>spring-boot-starter-test</artifactId>
             <scope>test</scope>
         </dependency>
+
+        <!--阿里巴巴的DRUID依赖-->
+        <dependency>
+            <groupId>com.alibaba</groupId>
+            <artifactId>druid-spring-boot-starter</artifactId>
+            <version>1.2.8</version>
+        </dependency>
+        <!--lombok依赖-->
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+        </dependency>
     </dependencies>
     <!--统一springboot依赖管理版本-->
     <dependencyManagement>

springboot-mybatis-quickstart/src/main/java/com/inmind/mapper/UserMapper.java

@@ -14,6 +14,7 @@ public interface UserMapper {
     /*
     查询所有用户数据
      */
-    @Select("select  * from user;")
+//    @Select("select  * from user;")
+    @Select("select * from user")
     public List<User> list();
 }

springboot-mybatis-quickstart/src/main/java/com/inmind/pojo/User.java

@@ -1,5 +1,14 @@
 package com.inmind.pojo;
 
+import lombok.*;
+
+/*@Getter
+@Setter
+@ToString
+@EqualsAndHashCode*/
+@Data
+@NoArgsConstructor //生成无参构造
+@AllArgsConstructor//生成满参构造方法
 public class User {
     private Integer id;
     private String name;
@@ -7,65 +16,4 @@ public class User {
     private Short gender;
     private String phone;
 
-    public User() {
-    }
-
-    public User(Integer id, String name, Integer age, Short gender, String phone) {
-        this.id = id;
-        this.name = name;
-        this.age = age;
-        this.gender = gender;
-        this.phone = phone;
-    }
-
-    @Override
-    public String toString() {
-        return "User{" +
-                "id=" + id +
-                ", name='" + name + '\'' +
-                ", age=" + age +
-                ", gender=" + gender +
-                ", phone='" + phone + '\'' +
-                '}';
-    }
-
-    public Integer getId() {
-        return id;
-    }
-
-    public void setId(Integer id) {
-        this.id = id;
-    }
-
-    public String getName() {
-        return name;
-    }
-
-    public void setName(String name) {
-        this.name = name;
-    }
-
-    public Integer getAge() {
-        return age;
-    }
-
-    public void setAge(Integer age) {
-        this.age = age;
-    }
-
-    public Short getGender() {
-        return gender;
-    }
-
-    public void setGender(Short gender) {
-        this.gender = gender;
-    }
-
-    public String getPhone() {
-        return phone;
-    }
-
-    public void setPhone(String phone) {
-        this.phone = phone;
-    }
 }

springboot-mybatis-quickstart/src/test/java/com/inmind/SpringbootMybatisQuickstartApplicationTests.java

@@ -6,21 +6,61 @@ import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
 
+import java.sql.*;
+import java.util.ArrayList;
 import java.util.List;
 
-@SpringBootTest
+@SpringBootTest //该注解的作用，启动spring环境，所以也就有了IOC容器
 class SpringbootMybatisQuickstartApplicationTests {
 
     @Autowired//直接从IOC容器中获取UserMapper类型的对象
-    private UserMapper userMapper;
+    private UserMapper userMapper;//接口开发，多态
 
     @Test
     void contextLoads() {
         //使用mybatis框架查询所有用户的数据
         List<User> list = userMapper.list();
         list.stream().forEach(user -> {
+            System.out.println(user.getId());
             System.out.println(user);
         });
     }
 
+    @Test
+    void testJDBC() throws ClassNotFoundException, SQLException {
+        //1. 注册驱动
+        Class.forName("com.mysql.cj.jdbc.Driver");
+
+        //2. 获取连接对象
+        String url = "jdbc:mysql://localhost:3306/mybatis";
+        String username = "root";
+        String password = "1234";
+        Connection connection = DriverManager.getConnection(url, username, password);
+
+        //3. 获取执行SQL的对象Statement,执行SQL,返回结果
+        String sql = "select * from user";
+        Statement statement = connection.createStatement();
+        ResultSet resultSet = statement.executeQuery(sql);
+
+        //4. 封装结果数据
+        List<User> userList = new ArrayList<>();
+        while (resultSet.next()){
+            int id = resultSet.getInt("id");
+            String name = resultSet.getString("name");
+            int age = resultSet.getInt("age");
+            short gender = resultSet.getShort("gender");
+            String phone = resultSet.getString("phone");
+
+            User user = new User(id,name,age,gender,phone);
+            userList.add(user);
+        }
+
+        //5. 释放资源
+        statement.close();
+        connection.close();
+
+
+        userList.forEach(System.out::println);
+    }
+
 }