mybatis--快速入门

springboot-mybatis-quickstart/src/main/java/com/inmind/SpringbootMybatisQuickstartApplication.java

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+package com.inmind;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class SpringbootMybatisQuickstartApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(SpringbootMybatisQuickstartApplication.class, args);
+    }
+
+}

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

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+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;
+
+/*
+专门操作用户表的Mapper接口
+ */
+@Mapper//mybatis在运行时，会自动生成该接口的实现类（代理对象），并且将该对象交给Spring容器管理（Bean对象）
+public interface UserMapper {
+    @Select("select * from user")
+    public List<User> list();
+}

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

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+package com.inmind.pojo;
+//对应User表的实体类
+public class User {
+    private Integer id;
+    private String name;
+    private Short age;
+    private Short gender;
+    private String phone;
+
+    public User() {
+    }
+
+    public User(Integer id, String name, Short age, Short gender, String phone) {
+        this.id = id;
+        this.name = name;
+        this.age = age;
+        this.gender = gender;
+        this.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 Short getAge() {
+        return age;
+    }
+
+    public void setAge(Short 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;
+    }
+
+    @Override
+    public String toString() {
+        return "User{" +
+                "id=" + id +
+                ", name='" + name + '\'' +
+                ", age=" + age +
+                ", gender=" + gender +
+                ", phone='" + phone + '\'' +
+                '}';
+    }
+}

springboot-mybatis-quickstart/src/main/resources/application.properties

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+#下面这些内容是为了让MyBatis映射
+#指定Mybatis的Mapper文件
+mybatis.mapper-locations=classpath:mappers/*xml
+#指定Mybatis的实体目录
+mybatis.type-aliases-package=com.inmind.mybatis.entity
+
+#驱动类名称
+spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
+#数据库连接的url
+spring.datasource.url=jdbc:mysql://localhost:3306/mybatis2
+#连接数据库的用户名
+spring.datasource.username=root
+#连接数据库的密码
+spring.datasource.password=1234

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

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+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;
+
+import java.util.List;
+
+@SpringBootTest//在进行单元测试时，启动spring程序，启动IOC，将程序中Bean对象加载到容器
+class SpringbootMybatisQuickstartApplicationTests {
+
+    @Autowired
+    private UserMapper userMapper;//注入的是mybatis自动生成的UserMapper接口类型的实现类对象
+
+    @Test
+    void contextLoads() {
+    }
+
+    @Test
+    void testList(){
+        List<User> userList = userMapper.list();
+        //通过集合获取Stream流，进行遍历消费，user就是集合中的每个元素，拿到每个元素进行打印消费
+//        userList.stream().forEach(user -> System.out.println(user));
+        for (User user : userList) {
+            System.out.println(user);
+        }
+    }
+
+}