煮溏心蛋很简单，只需要4个鸡蛋，500ml的清水，把鸡蛋洗净，然后放入水中焖煮8分钟左右就可以了，不过需要注意的是，水位需要高于鸡蛋0.5公分。溏心蛋的做法和注意事项
When I test DAO module in JUnit, an obvious problem is: how to recover testing data in database? For instance, a record should be deleted in both test methods testA() and testB(), that means precondit
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