Spring Boot @Transactional注解使用

一、使用spring 事务注解@Transactional

1.数据库表

users.sql

DROP TABLE IF EXISTS `users`;
CREATE TABLE `users`  (
  `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '主键id',
  `userName` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '用户名',
  `passWord` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '密码',
  `user_sex` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `nick_name` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 28 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

2.pom依赖

pom.xml

<dependencies>
		<!-- spring boot 项目-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <!-- 使用springboot mybatis -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.1</version>
        </dependency>

        <!-- druid连接池 -->
		<!--<dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.21</version>
        </dependency>-->

        <!-- 使用alibaba的spring boot druid数据库连接池  -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.10</version>
        </dependency>
        
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>

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

3.spring boot配置文件

application.properties

mybatis.type-aliases-package=com.ljj.entity
mybatis.mapper-locations=classpath:mapping/*.xml

#################### spring boot druid配置 ################################

spring.datasource.druid.url=jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=UTF-8&useSSL=false&allowPublicKeyRetrieval=true&serverTimezone=GMT%2B8
spring.datasource.druid.username=root
spring.datasource.druid.password=root
spring.datasource.druid.driver-class-name=com.mysql.cj.jdbc.Driver
# 初始化大小，最小，最大
spring.datasource.druid.initial-size=5
spring.datasource.druid.min-idle=5
spring.redis.jedis.pool.max-idle=100
spring.datasource.druid.max-active=200


# 配置获取连接等待超时的时间
spring.datasource.druid.max-wait=5000

# 每次使用连接时进行校验，会影响系统性能。默认为false
spring.datasource.druid.test-on-borrow=false
spring.datasource.druid.test-on-return=false

# 验证使用的SQL语句
spring.datasource.druid.validation-query=SELECT 1

# 指明连接是否被空闲连接回收器(如果有)进行检验.如果检测失败,则连接将被从池中去除
spring.datasource.druid.test-while-idle=true

# 每30秒运行一次空闲连接回收器（默认-1）
spring.datasource.druid.time-between-eviction-runs-millis=30000

# 池中的连接空闲30分钟后被回收（默认30分钟）
spring.datasource.druid.min-evictable-idle-time-millis=1800000

# 在每次空闲连接回收器线程(如果有)运行时检查的连接数量（设置为和maxIdle一样）
# 不再使用，一个DruidDataSource只支持一个EvictionRun
# spring.datasource.druid.num-tests-per-eviction-run=100

# 配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙
spring.datasource.druid.filters=stat,wall,log4j
spring.datasource.druid.filter.stat.log-slow-sql=true

################################################################################

4.实体类

User.java

@Data
@AllArgsConstructor
@NoArgsConstructor
@ToString
@EqualsAndHashCode
public class User {
    private long id;
    private String userName;
    private String passWord;
    private String userSex;
    private String nickName;

    public User(String userName, String passWord, String userSex, String nickName) {
        this.userName = userName;
        this.passWord = passWord;
        this.userSex = userSex;
        this.nickName = nickName;
    }
}

5.dao层

UserDao.java

@Repository
@MapperScan(basePackages = "com.ljj.dao")
public interface UserDao {
    List<User> getAll();

    User getOne(Long id);

    void insert(User user);

    void update(User user);

    void delete(Long id);
}

6.mapping映射

resources/mapping/UserMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.ljj.dao.UserDao" >
    <resultMap id="BaseResultMap" type="com.ljj.entity.User" >
        <id column="id" property="id" jdbcType="BIGINT" />
        <result column="userName" property="userName" jdbcType="VARCHAR" />
        <result column="passWord" property="passWord" jdbcType="VARCHAR" />
        <result column="user_sex" property="userSex" jdbcType="VARCHAR"/>
        <result column="nick_name" property="nickName" jdbcType="VARCHAR" />
    </resultMap>

    <sql id="Base_Column_List" >
        id, userName, passWord, user_sex, nick_name
    </sql>

    <select id="getAll" resultMap="BaseResultMap"  >
        SELECT
        <include refid="Base_Column_List" />
        FROM users
    </select>

    <select id="getOne" parameterType="java.lang.Long" resultMap="BaseResultMap" >
        SELECT
        <include refid="Base_Column_List" />
        FROM users
        WHERE id = #{id}
    </select>

    <insert id="insert" parameterType="com.ljj.entity.User" >
        INSERT INTO
            users
            (userName,passWord,user_sex)
        VALUES
            (#{userName}, #{passWord}, #{userSex})
    </insert>

    <update id="update" parameterType="com.ljj.entity.User" >
        UPDATE
        users
        SET
        <if test="userName != null">userName = #{userName},</if>
        <if test="passWord != null">passWord = #{passWord},</if>
        nick_name = #{nickName}
        WHERE
        id = #{id}
    </update>

    <delete id="delete" parameterType="java.lang.Long" >
        DELETE FROM
            users
        WHERE
            id =#{id}
    </delete>

</mapper>

7.service层

UserService.java

@Service
@Transactional
//@Transactional(rollbackFor = Exception.class)
@Slf4j
public class UserService {

    @Autowired
    private UserDao userDao;

    public void test() throws Exception {
        List<User> user = userDao.getAll();
        log.info("----------------> user: {}", user);
        User user1 = new User("eee", "eee", "eee", "angular");
        userDao.insert(user1);
        List<User> user2 = userDao.getAll();
        log.info("----------------> user: {}", user2);
        throw new RuntimeException("抛出一个运行期异常");
    }
}

@Transactional默认只是拦截RuntimeException，如果需要拦截Exception，则要加上rollbackFor参数

8.测试

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

    @Autowired
    private UserService userService;

    @Test
    public void test() {
        try {
            userService.test();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

9.github

GitHub