## `limit`
此方法用于指定查询条数
## 示例:
~~~
db.name('user').limit(10).select()
~~~
~~~
db.name('user').limit(0, 10).select()
~~~
- 连接数据库
- 链式操作方法
- distinct
- field
- withoutField
- name
- alias
- force
- join
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- union
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- where
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- whereTime
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- limit
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