springboot整合mybatisplus

环境声明

springboot-2.0.7.RELEASE
mybaits-plus-3.0.5

1.pom文件添加依赖

<!--mybatis-plus-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.0.5</version>
        </dependency>

        <!--mysql-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <!--lombok用来简化实体类-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>

2.在入口类上添加@MapperScan(“hmjack.mapper”)

3.创建entity类

@Data
public class User {

    @TableId(type = IdType.AUTO)
    private Long id;
    private String name;
    private Integer age;
    private String email;

    @TableField(fill = FieldFill.INSERT)
    private Date createTime;

    @TableField(fill = FieldFill.INSERT_UPDATE)
    private Date updateTime;

    @Version
    private Integer version;
}

@Data注解能够自动生成getting和setting方法

4.创建mapper类

@Repository
public interface UserMapper extends BaseMapper<User> {

}

@Repository注解能够让@Autowired注入时不报错

5.Test类测试mybatis-plus

@RunWith(SpringRunner.class)
@SpringBootTest
public class MybatisplusApplicationTests {

    @Autowired
    private UserMapper userMapper;

    @Test
    public void contextLoads() {
        System.out.println(("----- selectAll method test ------"));
        List<User> userList = userMapper.selectList(null);
        userList.forEach(System.out::println);
    }

}

当你将springboot高版本降低到低版本后出现Test不可用问题，你需要手动导入@Test的包：import org.junit.Test；

总结

mybatis-plus有很多很方便的功能，还有很多使用技巧等着你我去发现和使用。感谢你的阅读，希望这篇文章能给你带来一点点帮助。我是黑马Jack，用心学Java，不断学习新技术！