注意：
1.seata版本1.4.1
2.使用db配置，mysql
3.nacos版本2.2.3.RELEASE
4.spring-boot-starter-parent版本2.3.1.RELEASE
版本匹配很关键，否则报奇奇怪怪的错！！！！

seata库必要的表

-- -------------------------------- 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;

业务系统库必要表（每个业务库里都要添加）

-- 注意此处0.7.0+ 增加字段 context
CREATE TABLE `undo_log` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `branch_id` bigint(20) NOT NULL,
  `xid` varchar(100) NOT NULL,
  `context` varchar(128) NOT NULL,
  `rollback_info` longblob NOT NULL,
  `log_status` int(11) NOT NULL,
  `log_created` datetime NOT NULL,
  `log_modified` datetime NOT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `ux_undo_log` (`xid`,`branch_id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

seata

<dependency>
   <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-alibaba-seata</artifactId>
    <version>2.2.0.RELEASE</version>
    <!-- 排除依赖，指定版本和服务端一致 -->
    <exclusions>
        <exclusion>
            <groupId>io.seata</groupId>
            <artifactId>seata-spring-boot-starter</artifactId>
        </exclusion>
    </exclusions>
</dependency>
<dependency>
    <groupId>io.seata</groupId>
    <artifactId>seata-spring-boot-starter</artifactId>
    <version>1.4.1</version>
</dependency>

nacos

<dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
            <version>2.2.3.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            <version>2.2.3.RELEASE</version>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.cloud</groupId>
                    <artifactId>spring-cloud-netflix-ribbon</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

下载必要的启动文件
https://github.com/seata/seata/releases

下载必要的nacos里seata配置文件
https://github.com/seata/seata/tree/1.4.1

配置好nacos命名空间后，自动加载seata配置
1.找到/script/config-center/nacos/nacos-config.sh
2.修改里面的mysql配置

3.在git bash里执行脚本（修改命名空间id，nacos账号，nacos密码）

sh nacos-config.sh -h localhost -p 8848 -g SEATA_GROUP -t 5a3c7d6c-f497-4d68-a71a-2e5e3340b3ca -u username -w password

导入seata配置后效果图

服务yml配置（服务提供方和调用方配置一样）

seata:
  # 这里要特别注意和nacos中配置的要保持一致，建议配置成 ${spring.application.name}-tx-group
  tx-service-group: my_test_tx_group
  registry:
    type: nacos
    nacos:
      # 配置所在命名空间ID，如未配置默认public空间
      server-addr: 127.0.0.1:8848
      namespace: d173bb29-9a7c-4a01-aedd-056c63440ba8
      group: SEATA_GROUP
      application: seata-server
      userName: nacos
      password: nacos
  config:
    type: nacos
    nacos:
      server-addr: 127.0.0.1:8848
      namespace: d173bb29-9a7c-4a01-aedd-056c63440ba8
      group: SEATA_GROUP
      userName: nacos
      password: nacos
  service:
    vgroup-mapping:
      my_test_tx_group: default
    disable-global-transaction: false
  client:
    rm:
      report-success-enable: false

测试时记得在sevice层加@GlobalTransactional，仅调用方添加就行。
如果调用方没添加，被调用放添加，那么仅被调用方回滚。