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What type of PR is this?
What this PR does / why we need it (en: English/zh: Chinese):
en:
zh:
此次PR主要是补充了MongoDB的基础代码,这部分代码的主要目的是在现有生成代码不满足用户需求时使用基础Mongo代码,这样就可以为用户省去了自己开发和测试MongoDB公共库的时间。特别是对那些不熟悉MongoDB的用户来说很有用。因此,用户基本上可以完全依赖我们的工具就可以应对各种业务需求了。
Which issue(s) this PR fixes: