SpringBoot開啟申明式事務，只需要一個@Transactional就可以。因為在SpringBoot 中已經預設對jpa和mybatis，hibernate開啟了事務，在引入引用的時候自動就開啟了事務。但是想要用BeatlSQL的話，就必須自己手動開啟事務。

首先建立一個SpringBoot專案，然後引入所依賴的jar包。

<?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.forezp</groupId>
	<artifactId>springboot-mybatis</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>springboot-mybatis</name>
	<description>Demo project for Spring Boot</description>
	

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.2.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.mybatis.spring.boot</groupId>
			<artifactId>mybatis-spring-boot-starter</artifactId>
			<version>1.3.0</version>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<scope>runtime</scope>
		</dependency>
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>druid</artifactId>
			<version>1.0.29</version>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>


</project>
初始化資料庫如下： 
 

-- create table `account`
# DROP TABLE `account` IF EXISTS
CREATE TABLE `account` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(20) NOT NULL,
  `money` double DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;
INSERT INTO `account` VALUES ('1', '小明', '1001');
INSERT INTO `account` VALUES ('2', '小紅', '1002');
INSERT INTO `account` VALUES ('3', '小黑', '1003');
 

spring.datasource.url=jdbc:mysql://localhost:3306/test
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
mybatis.mapper-locations=classpath*:mybatis/*Mapper.xml
mybatis.type-aliases-package=com.forezp.entity

<?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.forezp.dao.AccountMapper2">


    <update id="update">
        UPDATE account set money=#{money} WHERE id=#{id}
    </update>
</mapper>
 

package com.forezp.entity;

/**
 * Created by zzf on 2017/01/12.
 */
public class Account {
    private int id ;
    private String name ;
    private double money;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public double getMoney() {
        return money;
    }

    public void setMoney(double money) {
        this.money = money;
    }

    @Override
    public String toString() {
        return "Account{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", money=" + money +
                '}';
    }
}

package com.forezp.dao;

import com.forezp.entity.Account;
import org.apache.ibatis.annotations.*;

import java.util.List;

/**
 * Created by zzf on 2017/1/12.
 */
@Mapper
public interface AccountMapper {

    @Insert("insert into account(name, money) values(#{name}, #{money})")
    int add(@Param("name") String name, @Param("money") double money);

    @Update("update account set name = #{name}, money = #{money} where id = #{id}")
    int update(@Param("name") String name, @Param("money") double money, @Param("id") int  id);

    @Delete("delete from account where id = #{id}")
    int delete(int id);

    @Select("select id, name as name, money as money from account where id = #{id}")
    Account findAccount(@Param("id") int id);

    @Select("select id, name as name, money as money from account")
    List<Account> findAccountList();
}

package com.forezp.service;

import com.forezp.dao.AccountMapper2;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

/**
 * Created by zzf on 2017/1/12.
 */
@Service
public class AccountService2 {

    @Autowired
    AccountMapper2 accountMapper2;

    @Transactional
    public void transfer() throws RuntimeException{
        accountMapper2.update(90,1);//使用者1減10塊 使用者2加10塊
        int i=1/0;
        accountMapper2.update(110,2);
    }
}

@Transactional，宣告事務，並設計一個轉賬方法，使用者1減10塊，使用者2加10塊。在使用者1減10 ，之後，丟擲異常，即使用者2加10塊錢不能執行，當加註解@Transactional之後，兩個人的錢都沒有增減。當不加@Transactional，使用者1減了10，使用者2沒有增加，即沒有操作使用者2 的資料。可見@Transactional註解開啟了事物。

結尾：

springboot 開啟事物很簡單，只需要加一行註解就可以了，前提你用的是jdbctemplate, jpa, mybatis，這種常見的orm。