n.保存點(diǎn)

Review savepoint and mark options for transactions. 檢查事務(wù)的保存點(diǎn)和標(biāo)記選項(xiàng)。

Roll back to the given savepoint. 回滾到給定的回滾點(diǎn)。

Explicitly release the given savepoint. 釋放一個(gè)給定的回滾點(diǎn)。

If a 547 error occurs, it rolls back to the savepoint and returns the number of items on hand to the calling process. 如果出現(xiàn)547錯(cuò)誤,它將回滾到該保存點(diǎn),并將當(dāng)前手邊有的項(xiàng)目數(shù)返回給調(diào)用進(jìn)程。

This is consistent with the principle that ROLLBACK cancels all effects of the commands since the savepoint. 這點(diǎn)和 ROLLBACK 取消所有命令自 savepoint （保存點(diǎn)）以來(lái)的影響的原則是一致的。