SpringBoot事务

4.6.整合事务

其实，我们引入jdbc或者web的启动器，就已经引入事务相关的依赖及默认配置了

至于事务，SpringBoot中通过注解来控制。就是我们熟知的@Transactional

@Service
public class UserService {

    @Autowired
    private UserMapper userMapper;

    public User queryById(Long id){
        return this.userMapper.selectByPrimaryKey(id);
    }

    @Transactional
    public void deleteById(Long id){
        this.userMapper.deleteByPrimaryKey(id);
    }
}

4.7.启动测试

在UserController中添加测试方法，内容：

@RestController
@RequestMapping("user")
public class UserController {

    @Autowired
    private UserService userService;

    @GetMapping("{id}")
    public User queryUserById(@PathVariable("id")Long id){
        return this.userService.queryById(id);
    }

    @GetMapping("hello")
    public String test(){
        return "hello ssm";
    }
}

我们启动项目，查看：

4.8.完整项目结构

完整的pom.xml：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <groupId>com.doyens.user</groupId>
    <artifactId>doyens-user</artifactId>
    <version>1.0-SNAPSHOT</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.6.RELEASE</version>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--jdbc的启动器，默认使用HikariCP连接池-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <!--不要忘记数据库驱动，因为springboot不知道我们使用的什么数据库，这里选择mysql-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <!--mybatis -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>

        <!-- 通用mapper -->
        <dependency>
            <groupId>tk.mybatis</groupId>
            <artifactId>mapper-spring-boot-starter</artifactId>
            <version>2.0.2</version>
        </dependency>
    </dependencies>

</project>

完整的application.properties：

server.port=80

logging.level.org.springframework=debug

spring.datasource.url=jdbc:mysql://localhost:3306/test
spring.datasource.username=root
spring.datasource.password=root

# mybatis 别名扫描
mybatis.type-aliases-package=com.doyens.pojo
# mapper.xml文件位置,如果没有映射文件，请注释掉
# mybatis.mapper-locations=classpath:mappers/*.xml