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2022-2-15 learning xiangniuke project - Section 4 business management

2022-07-01 14:20:00 【weixin_ thirty-seven million six hundred and eighty-two thousan】

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Read Uncommitted: Read uncommitted data , problem ：

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Business 1 Rollback as 10, normal , But for things 2, Ought to be 9, become 10 了

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To things 1 No problem , But the business 2, Ought to be 9, For now 11

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Into two mapper, To simulate an atomic operation

middle Integer.valueOf(“abc”) Will make mistakes , If things roll back , The first two insertUser and insertDiscussPost Will roll back

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propagation Refer to things A There is something in it B, So which is the rollback

Conduct test
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Made a mistake , Report errors , See if there is any new data inserted in the database

There are no new users or posts in the database , Things are isolated effectively

Programmatically isolate transactions

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Test the method , After reporting a mistake , There is no new in the database user and post, Successfully rolled back