## `comment`
此方法用于指定查詢注釋
## 示例:
~~~
db.name('user').comment('查詢用戶數據').find()
~~~
>[danger] 此方法會自動在生成的SQL語句中添加注釋內容
- 連接數據庫
- 鏈式操作方法
- distinct
- field
- withoutField
- name
- alias
- force
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- where
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- whereYear
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