SpringBoot精藏(六)SpringBoot開啟申明式事務
阿新 • • 發佈:2019-02-06
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');
接下來配置資料庫
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
然後再resources/mybatis下配置mybatis檔案
<?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>
建立實體
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 +
'}';
}
}
dao層
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();
}
service層
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。
需要原始碼請在下方去留下聯絡方式。