javaEEday08-Mybatis-入门2

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

@@ -1,4 +1,16 @@
 package com.inmind.mapper;
 
+import com.inmind.pojo.User;
+import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Select;
+
+import java.util.List;
+
+@Mapper//在运行时,会自动生成该接口的实现类对象(代理对象),并且将该对象交给spring的IOC容器
 public interface UserMapper {
+    //定义操作User表的方法（增删改查）
+    //查询所有用户信息的方法
+    @Select("select * from user")//当调用list()方法时，会自动发送该SQL语句给数据库mybatis
+    public List<User> list();
+
 }

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

@@ -66,4 +66,15 @@ public class User {
     public void setPhone(String phone) {
         this.phone = phone;
     }
+
+    @Override
+    public String toString() {
+        return "User{" +
+                "id=" + id +
+                ", name='" + name + '\'' +
+                ", age=" + age +
+                ", gender=" + gender +
+                ", phone='" + phone + '\'' +
+                '}';
+    }
 }

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

@@ -1,13 +1,29 @@
 package com.inmind;
 
+import com.inmind.mapper.UserMapper;
+import com.inmind.pojo.User;
 import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
 
-@SpringBootTest
+import java.util.List;
+
+@SpringBootTest//springboot整合junit单元测试的注解
 class SpringbootMybatisQuickstartApplicationTests {
+    //测试mybatis，查询所有的用户信息到java工程中
 
-    @Test
+    //依赖注入UserMapper对象
+    @Autowired
+    private UserMapper userMapper;
+
+    @Test//测试方法
     void contextLoads() {
+        //调用UserMapper的list()方法，查询所有用户信息
+        List<User> users = userMapper.list();
+        System.out.println(users);
+        users.stream().forEach(user->{
+            System.out.println(user);
+        });
     }
 
 }