现在列出计算机上的可用实例，并确认您的实例存在。

Now list the available instances on the machine and confirm your instance existence.

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为了成功生成部署环境，您需要确保有数据库实例存在。

For the deployment environment generation to succeed, you need to make sure that the database instances exist.

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此功能检查如果实例存在，如果是这样，它返回。

This function checks if the instance exists - if it does, it returns it.

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