spring boot 系列學習記錄：http://www.cnblogs.com/jinxiaohang/p/8111057.html

碼云源碼地址：https://gitee.com/jinxiaohang/springboot

　　此前，我們主要通過XML配置Spring來托管事務。在SpringBoot則非常簡單，只需在業務層添加事務注解(@Transactional )即可快速開啟事務。雖然事務很簡單，但對于數據方面是需要謹慎對待的，識別常見坑點對我們開發有幫助。

　　推薦做法：在業務層統一拋出異常，然后在控制層統一處理。

1. 引入依賴

如果是新建項目的，可以在這頁添加依賴，如是原有項目可直接編寫。

<?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.xiaohang</groupId><artifactId>springboot-transactional</artifactId><version>0.0.1-SNAPSHOT</version><packaging>jar</packaging><name>springboot-transactional</name><description>Demo project for Spring Boot</description><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.5.9.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.springframework.boot</groupId><artifactId>spring-boot-starter-data-jpa</artifactId></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>org.projectlombok</groupId><artifactId>lombok</artifactId><optional>true</optional></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>

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二、添加數據源

spring:datasource:url: jdbc:mysql://localhost:3306/test?useSSL=falseusername: rootpassword: rootdriver-class-name: com.mysql.jdbc.Driverjpa:hibernate:ddl-auto: updateshow-sql: true

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三、編寫各層代碼

• 實體層

import lombok.Data;import javax.persistence.Entity; import javax.persistence.Id; import java.math.BigDecimal;@Data @Entity public class UserAccount {@Idprivate String userId;private String userName;private BigDecimal balance; }

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• dao層

import com.xiaohang.springboottransactional.entity.UserAccount; import org.springframework.data.jpa.repository.JpaRepository;public interface UserAccountRepository extends JpaRepository<UserAccount,String>{ }

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• service層

public interface UserAccountService {/*** 轉賬*/public UserAccount change(String userId,BigDecimal bigDecimal,String userId2) throws Exception; }

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• service實現層

import com.xiaohang.springboottransactional.entity.UserAccount; import com.xiaohang.springboottransactional.repository.UserAccountRepository; import com.xiaohang.springboottransactional.service.UserAccountService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import org.springframework.transaction.annotation.Transactional;import java.math.BigDecimal;@Service public class UserAccountServiceImpl implements UserAccountService {@Autowiredprivate UserAccountRepository userAccountRepository;@Transactional@Overridepublic UserAccount change(String userId, BigDecimal bigDecimal, String userId2) throws Exception{UserAccount userAccount = userAccountRepository.findOne(userId);UserAccount userAccount2 = userAccountRepository.findOne(userId2);userAccount.setBalance(userAccount.getBalance().add(bigDecimal));userAccount2.setBalance(userAccount2.getBalance().subtract(bigDecimal));userAccountRepository.save(userAccount);int n=1/0;//throw new Exception();//假設發生故障 userAccountRepository.save(userAccount2);return userAccountRepository.findOne(userId);} }

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• 測試層

import com.xiaohang.springboottransactional.service.UserAccountService; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.context.SpringBootTest; import org.springframework.test.context.junit4.SpringRunner; import java.math.BigDecimal;@RunWith(SpringRunner.class) @SpringBootTest public class UserAccountServiceImplTest {@Autowiredprivate UserAccountService userAccountService;@Testpublic void change() throws Exception {try {System.out.println(userAccountService.change("1",new BigDecimal("100"),"2"));}catch (Exception e){System.out.println("拋出異常");}}}

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三、測試

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?原始數據：

?

?

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?不開啟事務，不拋出異常時：

?

?

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?不開啟事務，拋出異常時（轉賬時發生錯誤，錢扣完，但是對方錢未到賬；或者錢到帳了，但是錢未扣。）

?

?

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?先恢復數據：

?開啟事務，拋出異常時。

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轉載于:https://www.cnblogs.com/jinxiaohang/p/8296549.html

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