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在hibernate 删除关联时会出现eleted object would be re-saved by cascade (remove deleted object from associations)的异常,结合别人的和自己的经验通常有三种解决的方案:
方法1 删除Set方的cascade:
方法2 解决关联关系后,再删除
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方法3 在many-to-one方增加cascade 但值不能是none
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