Non-repeatable reads: The reopened cursor in A1 retrieves updates of A2 on qualifying rows.

不可重复的读取：A 1中重新打开的游标检索a 2对符合资格的行的更新。

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Repeatable read — the transaction always reads the same data during the transaction.

Repeatableread(可重读)——在事务过程中，事务始终读取相同的数据。

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Repeatable read — the transaction always reads the same data during the transaction.

Repeatableread(可重读)——在事务过程中，事务始终读取相同的数据。

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