Spring Boot整合

原创已于 2023-09-21 20:39:56 修改 · 85 阅读

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#spring boot #后端 #java

于 2023-09-21 20:22:59 首次发布

本文介绍了如何在SpringBoot项目中集成MyBatisPlus进行单元测试，包括使用JUnit@SpringBootTest注解，设置数据源（如Druid），MyBatisPlus的分页和动态查询，以及快速开发中的业务接口和服务实现。

JUnit

导入坐标

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
    <scope>test</scope>
</dependency>

测试类注解

@SpringBootTest
class Springboot07JunitApplicationTests {
    @Autowired
    private BookService bookService;
    @Test
    public void testSave(){
        bookService.save();
    }
}

添加启动类

@SpringBootTest(classes = Springboot05JUnitApplication.class)
class Springboot07JUnitApplicationTests {}

Mybatis

设置数据源

spring:
datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/ssm_db
    username: root
    password: root

Mybatis Plus

中央仓库：Maven Repository: com.baomidou » mybatis-plus-boot-starter (mvnrepository.com)https://mvnrepository.com/artifact/com.baomidou/mybatis-plus-boot-starter

添加坐标

<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
    <version>3.4.3</version>
</dependency>

配置

mybatis-plus:
  global-config:
    db-config:
      table-prefix:
      id-type: auto
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

定义数据层接口与映射配置，继承BaseMapper

@Mapper
public interface UserDao extends BaseMapper<User> {
}

分页

分页操作是在MyBatisPlus的常规操作基础上增强得到，内部是动态的拼写SQL语句，因此需要增强对应的功能，使用MyBatisPlus拦截器实现

    @Configuration
    public class MpConfig {
        @Bean
        public MybatisPlusInterceptor mpInterceptor() {
            //1.定义Mp拦截器
            MybatisPlusInterceptor mpInterceptor = new MybatisPlusInterceptor();
            //2.添加具体的拦截器
            mpInterceptor.addInnerInterceptor(new PaginationInnerInterceptor());
            return mpInterceptor;
        }
    }

使用IPage封装分页数据

使用QueryWrapper对象封装查询条件，推荐使用LambdaQueryWrapper对象，所有查询操作封装成方法调用

    @Test
    void testGetByCondition(){
        IPage page = new Page(1,10);
        LambdaQueryWrapper<Book> lqw = new LambdaQueryWrapper<Book>();
        lqw.like(Book::getName,"Spring");
        bookDao.selectPage(page,lqw);
    }

支持动态拼写查询条件

    @Test
    void testGetByCondition(){
        String name = "Spring";
        IPage page = new Page(1,10);
        LambdaQueryWrapper<Book> lqw = new LambdaQueryWrapper<Book>();
        lqw.like(Strings.isNotEmpty(name),Book::getName,"Spring");
        bookDao.selectPage(page,lqw);
    }

快速开发

使用MyBatisPlus提供业务层通用接口（ISerivce<T>）与业务层通用实现类（ServiceImpl<M,T>）

public interface IBookService extends IService<Book> {
}

public interface IBookService extends IService<Book> {
    //追加的操作与原始操作通过名称区分，功能类似
    Boolean delete(Integer id);
    Boolean insert(Book book); 
    Boolean modify(Book book);
    Book get(Integer id);
}

    @Service
    public class BookServiceImpl2 extends ServiceImpl<BookDao,Book> implements IBookService {
        @Autowired
        private BookDao bookDao;
        public Boolean insert(Book book) {
            return bookDao.insert(book) > 0;
        }
        public Boolean modify(Book book) {
            return bookDao.updateById(book) > 0;
        }
        public Boolean delete(Integer id) {
            return bookDao.deleteById(id) > 0;
        }
        public Book get(Integer id) {
            return bookDao.selectById(id);
        }
    }

Druid

导入坐标

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid-spring-boot-starter</artifactId>
    <version>1.2.6</version>
</dependency>

变更配置方式

spring:
    datasource:
        druid:
            driver-class-name: com.mysql.cj.jdbc.Driver
            url: jdbc:mysql://localhost:3306/database_name?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull&useSSL=false&allowPublicKeyRetrieval=true
            username: username
            password: password