在做hibernate保存时出现异常object references an unsaved transient instance - save the transient instance before flushing:
hibernate没配置cascade属性,在保存对象时需要先保存多的,再保存一的 save顺序问题~~~比如学生表和班级表。。学生表里有班级ID的外键。一对多的关系。 你save的时候应该先save班级,再save学生。。否则学生的外键没有对应的值,引发异常,如果有对应的外键则保存正常。many-to-one没配cascade属性会自动检查外键列是否正确,不存在不能保存。
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