springcloud第4季分布式事务seata实现AT模式案例

一 seata案例

1.1 背景说明

本案例使用seata的at模式，模拟分布式事务场景：【下订单，减库存，扣余额，改状态】

1.2 初始化脚本

1.2.1 新建seata_order_024 库

1.新建undol_log表

-- 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`
(`branch_id`     BIGINT       NOT NULL COMMENT 'branch transaction id',`xid`           VARCHAR(128) 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(6)  NOT NULL COMMENT 'create datetime',`log_modified`  DATETIME(6)  NOT NULL COMMENT 'modify datetime',UNIQUE KEY `ux_undo_log` (`xid`, `branch_id`)
) ENGINE = InnoDB AUTO_INCREMENT = 1 DEFAULT CHARSET = utf8mb4 COMMENT ='AT transaction mode undo table';

2.新建t_order表

CREATE TABLE t_order(`id` BIGINT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY,`user_id` BIGINT(11) DEFAULT NULL COMMENT '用户id',`product_id` BIGINT(11)DEFAULT NULL COMMENT '产品id',`count` INT(11) DEFAULT NULL COMMENT '数量',`money` DECIMAL(11,0) DEFAULT NULL COMMENT '金额',`status` INT(1) DEFAULT NULL COMMENT '订单状态: 0:创建中; 1:已完结')ENGINE=INNODB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

1.2.2 创建seata_storage_024库

1.undo.log表

-- 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`
(`branch_id`     BIGINT       NOT NULL COMMENT 'branch transaction id',`xid`           VARCHAR(128) 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(6)  NOT NULL COMMENT 'create datetime',`log_modified`  DATETIME(6)  NOT NULL COMMENT 'modify datetime',UNIQUE KEY `ux_undo_log` (`xid`, `branch_id`)
) ENGINE = InnoDB AUTO_INCREMENT = 1 DEFAULT CHARSET = utf8mb4 COMMENT ='AT transaction mode undo table';

2.新建业务表 t_storage

CREATE TABLE t_storage(`id` BIGINT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY,`product_id` BIGINT(11) DEFAULT NULL COMMENT '产品id',`total` INT(11) DEFAULT NULL COMMENT '总库存',`used` INT(11) DEFAULT NULL COMMENT '已用库存',`residue` INT(11) DEFAULT NULL COMMENT '剩余库存')ENGINE=INNODB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;INSERT INTO t_storage(`id`,`product_id`,`total`,`used`,`residue`)VALUES('1','1','100','0','100');SELECT * FROM t_storage;

1.2.3 创建seata_account_024库

1.undo.log表

-- 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`
(`branch_id`     BIGINT       NOT NULL COMMENT 'branch transaction id',`xid`           VARCHAR(128) 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(6)  NOT NULL COMMENT 'create datetime',`log_modified`  DATETIME(6)  NOT NULL COMMENT 'modify datetime',UNIQUE KEY `ux_undo_log` (`xid`, `branch_id`)
) ENGINE = InnoDB AUTO_INCREMENT = 1 DEFAULT CHARSET = utf8mb4 COMMENT ='AT transaction mode undo table';

2.创建表 t_account

CREATE TABLE t_account(`id` BIGINT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY COMMENT 'id',`user_id` BIGINT(11) DEFAULT NULL COMMENT '用户id',`total` DECIMAL(10,0) DEFAULT NULL COMMENT '总额度',`used` DECIMAL(10,0) DEFAULT NULL COMMENT '已用账户余额',`residue` DECIMAL(10,0) DEFAULT '0' COMMENT '剩余可用额度')ENGINE=INNODB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;INSERT INTO t_account(`id`,`user_id`,`total`,`used`,`residue`)VALUES('1','1','1000','0','1000');SELECT * FROM t_account;