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+# Seata Example
+
+
+
+##Project Description
+
+
+
+
+This project demonstrates how to use Seata Starter to complete distributed transaction access for Spring Cloud applications.
+
+
+
+[Seata] ( https://github.com/seata/seata ) is Alibaba's open source distributed transaction middleware that addresses the distributed transaction issues facing the micro-service scenario in an efficient and intrusive way.
+
+
+
+
+
+##Preparations
+
+
+
+Before running this example, you need to complete the following steps:
+
+
+
+1. Configure the database
+
+
+
+1. Create UNDO_ LOG table
+
+
+
+1. Create the database tables needed by the business in the example
+
+
+
+1. Import Nacos Configuration
+
+[ https://github.com/seata/seata/blob/1.5.0/script/config-center/config.txt ]
+
+
+
+1. Start Seata Server
+
+
+
+
+###Configuration database
+
+
+
+First, you need a MySQL database that supports the InnoDB engine.
+
+
+
+**NOTE**: In fact, Seata supports different applications that use totally unrelated databases, but here we chose to use only one database for a simple demonstration of one principle.
+
+
+
+Will `application'in the resources directory of the `account-server', `order-service', `storage-service` three applications. The following configuration in the yml`file is modified to the actual configuration in your running environment.
+
+
+
+```
+
+Mysql. Server. Ip=your MySQL server IP address
+
+Mysql. Server. Port=your MySQL server listening port
+
+Mysql. Db. Name=your database name for test
+
+
+
+Mysql. User. Name=your MySQL server username
+
+Mysql. User. Password=your MySQL server password
+
+
+
+```
+
+
+
+###Create undo_ Log table
+
+
+
+[Seata AT mode]() requires undo_ Log table.
+
+
+
+````$sql
+
+--Notice here that 0.3.0 + increases the unique index ux_ Undo_ Log
+
+CREATE TABLE `undo_ Log` (
+
+`id`bigint(20) NOT NULL AUTO_ INCREMENT,
+
+`branch_ Id` bigint(20) NOT NULL,
+
+`xid`varchar(100) NOT NULL,
+
+`context`varchar(128) NOT NULL,
+
+`rollback_ Info` longblob NOT NULL,
+
+`log_ Status` int(11) NOT NULL,
+
+`log_ Create`datetime NOT NULL,
+
+`log_ Modified`datetime NOT NULL,
+
+`ext`varchar(100) DEFAULT NULL,
+
+PRIMARY KEY (`id`),
+
+UNIQUE KEY `ux_ Undo_ Log` (`xid`, `branch_id`)
+
+) ENGINE=InnoDB AUTO_ INCREMENT=1 DEFAULT CHARSET=utf8;
+
+```
+
+Database tables needed to import seata-server DB schema
+
+Initialize [global_table, branch_table, lock_table, distributed_lock] in the database
+
+Click to view: https://github.com/seata/seata/blob/1.5.0/script/server/db/mysql.sql
+
+````$sql
+
+-------------------------------------- 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_ Status_ Gmt_ Modified` (`status`, `gmt_modified`),
+
+KEY `idx_ Transaction_ Id` (`transaction_id`)
+
+) ENGINE = InnoDB
+
+DEFAULT CHARSET = utf8mb4;
+
+
+
+-- 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 = utf8mb4;
+
+
+
+-- the table to store lock data
+
+CREATE TABLE IF NOT EXISTS `lock_ Table`
+
+(
+
+`row_ Key` VARCHAR(128) NOT NULL,
+
+`xid` VARCHAR (128),
+
+`transaction_ Id` BIGINT,
+
+`branch_ Id` BIGINT NOT NULL,
+
+`resource_ Id` VARCHAR (256),
+
+`table_ Name` VARCHAR (32),
+
+`pk` VARCHAR(36),
+
+`status` TINYINT NOT NULL DEFAULT'0'COMMENT'0:locked, 1:rollbacking',
+
+`gmt_ Create` DATETIME,
+
+`gmt_ Modified` DATETIME,
+
+PRIMARY KEY (`row_key`),
+
+KEY `idx_ Status` (`status`),
+
+KEY `idx_ Branch_ Id` (`branch_id`),
+
+KEY `idx_ Xid_ And_ Branch_ Id` (`xid`, `branch_id`)
+
+) ENGINE = InnoDB
+
+DEFAULT CHARSET = utf8mb4;
+
+
+
+CREATE TABLE IF NOT EXISTS `distributed_ Lock`
+
+(
+
+`lock_ Key` CHAR(20) NOT NULL,
+
+`lock_ Value` VARCHAR(20) NOT NULL,
+
+`expire` BIGINT,
+
+Primary key (`lock_key`)
+
+) ENGINE = InnoDB
+
+DEFAULT CHARSET = utf8mb4;
+
+
+
+INSERT INTO `distributed_ Lock` (lock_key, lock_value, expire) VALUES ('AsyncCommitting',', 0);
+
+INSERT INTO `distributed_ Lock` (lock_key, lock_value, expire) VALUES ('RetryCommitting',', 0);
+
+INSERT INTO `distributed_ Lock` (lock_key, lock_value, expire) VALUES ('RetryRollbacking',', 0);
+
+INSERT INTO `distributed_ Lock` (lock_key, lock_value, expire) VALUES ('TxTimeoutCheck',', 0);
+
+```
+
+###Create the database tables needed by the business in the sample
+
+
+
+````$sql
+
+DROP TABLE IF EXISTS `storage_ Tbl`;
+
+CREATE TABLE `storage_ Tbl` (
+
+`id` int(11) NOT NULL AUTO_ INCREMENT,
+
+`commodity_ Code` varchar(255) DEFAULT NULL,
+
+`count` int(11) DEFAULT 0,
+
+PRIMARY KEY (`id`),
+
+UNIQUE KEY (`commodity_code`)
+
+ENGINE=InnoDB DEFAULT CHARSET=utf8;