首页 > 其他分享> > 分布式事务seata的安装与使用

分布式事务seata的安装与使用

2021-07-25 12:05:10 作者：互联网

环境准备

我是在windows上安装的
下载如下网址中对应版本的binary即可
https://seata.io/zh-cn/blog/download.html
此处需要注意：需要手动的将mysql的连接包传入lib文件夹中
我这里用的是mysql8 所以传入了mysql-connector-java-8.0.22.jar

sql准备

1.新建seata库加入如下表

-- -------------------------------- The script used when storeMode is 'db' --------------------------------
-- the table to store GlobalSession data
CREATE TABLE IF NOT EXISTS `global_table`
(
    `xid`                       VARCHAR(128) NOT NULL,
    `transaction_id`            BIGINT,
    `status`                    TINYINT      NOT NULL,
    `application_id`            VARCHAR(32),
    `transaction_service_group` VARCHAR(32),
    `transaction_name`          VARCHAR(128),
    `timeout`                   INT,
    `begin_time`                BIGINT,
    `application_data`          VARCHAR(2000),
    `gmt_create`                DATETIME,
    `gmt_modified`              DATETIME,
    PRIMARY KEY (`xid`),
    KEY `idx_gmt_modified_status` (`gmt_modified`, `status`),
    KEY `idx_transaction_id` (`transaction_id`)
) ENGINE = InnoDB
  DEFAULT CHARSET = utf8;
 
-- the table to store BranchSession data
CREATE TABLE IF NOT EXISTS `branch_table`
(
    `branch_id`         BIGINT       NOT NULL,
    `xid`               VARCHAR(128) NOT NULL,
    `transaction_id`    BIGINT,
    `resource_group_id` VARCHAR(32),
    `resource_id`       VARCHAR(256),
    `branch_type`       VARCHAR(8),
    `status`            TINYINT,
    `client_id`         VARCHAR(64),
    `application_data`  VARCHAR(2000),
    `gmt_create`        DATETIME(6),
    `gmt_modified`      DATETIME(6),
    PRIMARY KEY (`branch_id`),
    KEY `idx_xid` (`xid`)
) ENGINE = InnoDB
  DEFAULT CHARSET = utf8;
 
-- the table to store lock data
CREATE TABLE IF NOT EXISTS `lock_table`
(
    `row_key`        VARCHAR(128) NOT NULL,
    `xid`            VARCHAR(96),
    `transaction_id` BIGINT,
    `branch_id`      BIGINT       NOT NULL,
    `resource_id`    VARCHAR(256),
    `table_name`     VARCHAR(32),
    `pk`             VARCHAR(36),
    `gmt_create`     DATETIME,
    `gmt_modified`   DATETIME,
    PRIMARY KEY (`row_key`),
    KEY `idx_branch_id` (`branch_id`)
) ENGINE = InnoDB
  DEFAULT CHARSET = utf8;

2.在需要全局事务的库中加入undo_log

-- for AT mode you must to init this sql for you business database. the seata server not need it.
CREATE TABLE IF NOT EXISTS `undo_log`
(
    `id`            BIGINT(20)   NOT NULL AUTO_INCREMENT COMMENT 'increment id',
    `branch_id`     BIGINT(20)   NOT NULL COMMENT 'branch transaction id',
    `xid`           VARCHAR(100) NOT NULL COMMENT 'global transaction id',
    `context`       VARCHAR(128) NOT NULL COMMENT 'undo_log context,such as serialization',
    `rollback_info` LONGBLOB     NOT NULL COMMENT 'rollback info',
    `log_status`    INT(11)      NOT NULL COMMENT '0:normal status,1:defense status',
    `log_created`   DATETIME     NOT NULL COMMENT 'create datetime',
    `log_modified`  DATETIME     NOT NULL COMMENT 'modify datetime',
    PRIMARY KEY (`id`),
    UNIQUE KEY `ux_undo_log` (`xid`, `branch_id`)
) ENGINE = InnoDB
  AUTO_INCREMENT = 1
  DEFAULT CHARSET = utf8 COMMENT ='AT transaction mode undo table';

配置文件修改

要修改两个配置文件
1.file.conf
mode改为db 数据库连接串修改
目的就是连接到上文创建的那个库
在这里插入图片描述
2.registry.conf
这个是将seata服务注册到注册中心用的
我这里用的ureka 就将type修改成eureka
然后修改相应的eureka的地址我是本地运行的

这样环境准备就可以了打开自己的注册中心并运行bin文件夹中的seata-server.sh 看看seata是否正常启动

代码准备

pom引入

我是用的1.2

   <dependency>
             <groupId>io.seata</groupId>
            <artifactId>seata-all</artifactId>
             <version>1.2.0</version>
             </dependency>
        <dependency>

spring启动的Application也要修改
加入


@SpringBootApplication(exclude = {
        DataSourceAutoConfiguration.class
})
@EnableAutoDataSourceProxy

引入三个文件


@Configuration
public class DataSourceConfiguration {

    @Value("${spring.cloud.alibaba.seata.tx-service-group}")
    private String group;
    @Value("${spring.application.name}")
    private String appName;

    @Bean
    public FescarXidFilter fescarXidFilter(){
        return new FescarXidFilter();
    }

    @Bean
    public GlobalTransactionScanner globalTransactionScanner(){
        GlobalTransactionScanner scanner = new GlobalTransactionScanner(appName,group);
        return scanner;
    }

    @Bean
    @ConfigurationProperties(prefix = "spring.datasource")
    public DataSource druidDataSource(){
        DruidDataSource druidDataSource = new DruidDataSource();
        return druidDataSource;
    }

    @Primary
    @Bean("dataSource")
    public DataSourceProxy dataSource(DataSource druidDataSource){
        return new DataSourceProxy(druidDataSource);
    }

//    @Bean
//    public SqlSessionFactory sqlSessionFactory(DataSourceProxy dataSourceProxy)throws Exception{
//        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
//        sqlSessionFactoryBean.setDataSource(dataSourceProxy);
//        sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver()
//                .getResources("classpath*:/mapper/*.xml"));
//        sqlSessionFactoryBean.setTransactionFactory(new SpringManagedTransactionFactory());
//        return sqlSessionFactoryBean.getObject();
//    }

}



@Slf4j
public class FescarXidFilter extends OncePerRequestFilter {

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
        String xid = RootContext.getXID();
        String restXid = request.getHeader("Fescar-Xid");
        boolean bind = false;
        if(StringUtils.isBlank(xid)&&StringUtils.isNotBlank(restXid)){
            RootContext.bind(restXid);
            bind = true;
            if (logger.isDebugEnabled()) {
                logger.debug("bind[" + restXid + "] to RootContext");
            }
        }
        try{
            filterChain.doFilter(request, response);
        } finally {
            if (bind) {
                String unbindXid = RootContext.unbind();
                if (logger.isDebugEnabled()) {
                    logger.debug("unbind[" + unbindXid + "] from RootContext");
                }
                if (!restXid.equalsIgnoreCase(unbindXid)) {
                    logger.warn("xid in change during http rest from " + restXid + " to " + unbindXid);
                    if (unbindXid != null) {
                        RootContext.bind(unbindXid);
                        logger.warn("bind [" + unbindXid + "] back to RootContext");
                    }
                }
            }
        }
    }
}







@Component
public class RequestHeaderInterceptor implements RequestInterceptor {

    @Override
    public void apply(RequestTemplate template) {
        String xid = RootContext.getXID();
        if(StringUtils.isNotBlank(xid)){
            template.header("Fescar-Xid",xid);
        }
    }
}

配置文件加入如下
在这里插入图片描述

最后在事务管理的主入口加入如下注解即可

@GlobalTransactional(name="register_tx",rollbackFor = Exception.class)