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如何升级MySQL版本

当前MySQL版本:5.5.40

目标MySQL版本:MySQL 5.7

OS:CentOS 6.5版(最终版)

余额未显示正确值

MySQL 数据库表：

CREATE TABLE `transactions` (
  `trx_id` int(11) NOT NULL AUTO_INCREMENT,
  `trx_type` enum('debit','credit') DEFAULT NULL,
  `trx_amount` float DEFAULT NULL,
  `trx_description` mediumtext NOT NULL,
  `trx_date` date NOT NULL,
  `purpose_id` int(11) NOT NULL,
  `staff_id` int(11) DEFAULT NULL,
  `admin_id` int(11) NOT NULL,
  `created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`trx_id`)
) ENGINE=InnoDB AUTO_INCREMENT=8 DEFAULT CHARSET=utf8;

/*表的数据transactions*/

insert  into `transactions`(`trx_id`,`trx_type`,`trx_amount`,`trx_description`,`trx_date`,`purpose_id`,`staff_id`,`admin_id`,`created_at`,`updated_at`)
 values (1,'credit',100,'annual tour','2016-01-01',2,7,2,'2016-11-24 10:28:35','2016-11-29 12:21:08'),
 (2,'debit',200,'Product Sale','2016-11-19',6,5,2,'2016-11-24 10:33:02','2016-11-29 12:21:12'),
 (3,'debit',250,'Product Sale','2016-11-19',6,4,2,'2016-11-24 …