数据库事务演示

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1 创建数据库和账户表 

DROP DATABASE IF EXISTS tx;
CREATE DATABASE tx;
USE tx;

CREATE TABLE account(
  id INT PRIMARY KEY AUTO_INCREMENT,
  `name` VARCHAR(40),
  money FLOAT
);

INSERT INTO account(`name`,money) VALUES('SuperMan',1000);
INSERT INTO account(`name`,money) VALUES('BatMan',1000);

SELECT * FROM account;

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2 重账户置表

TRUNCATE TABLE account;
INSERT INTO account(`name`,money) VALUES('SuperMan',1000);
INSERT INTO account(`name`,money) VALUES('BatMan',1000);
SELECT * FROM account;

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3 MySql8.0 查看事务隔离级别

SELECT @@global.transaction_isolation,@@transaction_isolation;

SHOW VARIABLES LIKE '%iso%';

MySql 默认的事务隔离级别：REPEATABLE READ

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4 修改事务的隔离级别

SET SESSION TRANSACTION ISOLATION LEVEL Xxx ;

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5 模拟 “银行转账”

START TRANSACTION;
UPDATE account SET money = money - 100 WHERE `name` = 'SuperMan';
UPDATE account SET money = money + 100 WHERE `name` = 'BatMan';
COMMIT;