如果没有新的数据要显示在页面上呢？
因此，在更新了数据模型之后，就可以确保其下没有书的那些类别已被删除并且所有新的类别已被添加。
Therefore, after updating the data model, you can guarantee that any category without books has been removed and any new category has been added.
前一个钩子定义了新的数据结构，但没有描述它与一个节点的关系。
The previous hook defines the new data structure, but does not describe how it and a node relate.
应用程序通常围绕一组数据进行设计，旨在将自己公开并与其他数据集结合，从而创建数据提供者都没有料到的新的应用程序。
Applications usually are designed around a set of data, meant to be exposed and mixed with other data sets, to create new applications that perhaps the data provider does not anticipate.
这样就在没有更改任何代码的情况下添加了对新数据类型的支持。
That adds support for a new data type without changing a line of code.
礼仪阻止气体生成，因此，再没有新的甲醇氯仿物能够打乱这项研究的数据了。
The gas was banned by the Montreal Protocol, so now, no new methyl chloroform is fouling the data.
随着数据的收集，很明显，沿新马德里断层没有出现此类动向。
As the data was collected, it became evident that such motion was not occurring along the New Madrid fault.
确保您选择的数据中心中至少有一个空闲地址；如果没有，单击addIP，等待新IP地址变得可用(图4)。
Make sure there is at least one free address in the data center of your choice; if not, click add IP and wait for new IP address to become available (Figure 4).
根据微软披露的新数据，到目前为止，2010年企业并没有什么动力去升级到Windows7。
According to new data revealed by Microsoft, the enterprise upgrade to Windows 7 does not have much momentum so far in 2010.
在这个场景中，列表对象需要关联到一个新的主查询，该查询只包含没有摘要过滤器的Productline数据项。
In this scenario, the list object will need to be associated to a new master query which consists of only the Product line data item with no summary filter.
每个浏览器的隐私设置都不同，但是没有一个浏览器有明显的功能，可以直接删除由新web语言创建的数据。
Each browser has different privacy Settings, but not all of them have obvious Settings for removing data created by the new Web language.
update方法没有增加新功能，但必须将新的XML数据保存到DB2。
The update method here brings no new functionality, but is definitely necessary to save the new XML data to DB2.
自从安装新的保密程序后，我们的电脑没有出现数据丢失的问题。
We’ve had no data leakage problems since we’ve installed our new security program.
当您向er域添加没有数据的新服务器时，可以在这个新服务器上实例化模板。
When you add a new server with no data to the er domain, you can instantiate the template on the new server.
如果只是因为数据库允许您请求，就不断地为一个已经预订的房间保存新的预订请求，那没有比这更令人沮丧的了！
Nothing would be more frustrating than to have to repeatedly save new reservation requests for an already-reserved room just because the database lets you request it anyway!
它可以迅速更新表单数据，让人感觉应用程序是立即完成的，表单没有提交或刷新而用户得到了新数据。
It can update form fields on the fly, giving that immediate feeling to your application — users are getting new data without their form being submitted or refreshed.
尽管业务用户希望将该数据用于报告或其他新程序，但是没有以有序方式收集和重用数据的有效技术。
Although business users wanted to use this data for reporting or with other newer programs, there was no effective technique for collecting and reusing data in an organized manner.
对于下一个请求，由于没有缓存的版本，所以会生成新的数据项。
The next request would see that there is no cached version, and generate a new entry.
由于包的名称不同，在运行时搜索这个新的包时将得到一个错误，因为它没有被绑定到数据库(和在前面的例子中一样)。
Because the package name is different, the search for the new package at runtime results in an error since it isn't bound to the database (as in the previous examples).
报告没有包括沿海新的石油和天然气储量的预计，而对现有资源的估计也是基于25年前的老旧的地震学研究数据。
It includes no new estimates of potential oil and gas reserves offshore and notes that some of the existing estimates are based on 25-year-old seismic studies.
但是映射缺乏一些结构化数据的预期功能：它们没有真实的“类型”(在不添加元数据的情况下)，不像类那样，它们不能通过新的行为扩展。
But maps lack some of the features expected of structured data: they have no real "type" (without added metadata) and, unlike classes, they can't be extended with new behavior.
根据国际能源机构的数据，如果没有新的生长点，随着其西伯利亚油田被完全开发，到2035年，俄罗斯的石油日产量可能会减少到近一百万桶。
As its Siberian oil fields mature, daily output in Russia, without new development, could be reduced by nearly a million barrels by the year 2035, according to the International Energy Agency.
局部变量上的数据竞争将是一种新的危险，因为我们目前始终期望局部变量访问没有数据竞争。
Data RACES on local variables would be a new category of hazards, because we currently can always count on local-variable accesses being data-race-free.
SELECT *也会检索那些新的列，而如果没有进行费时的更改，您的程序也许无法处理附加的数据。
SELECT * will retrieve those new columns, too, and your program might not be capable of handling the additional data without requiring time-consuming changes.
如此来看，虽然近几个月没有新的生产数据披露，波多黎各的国内衰退似乎也已经恶化了。
Thus, although there has been little new production data released in recent months, it appears that Puerto Rico's domestic recession has deepened.
从评估数据我们可以明显看出，多数的音乐消费者并没有充分利用我们所处的新媒体时代的优势。
By assessing the data, it leads one to believe that the majority of music consumers are not taking full advantage of this new media age we live in.
许多新的可视化标准要求您以新的格式表示数据，这些格式没有得到充分支持或不存在。
Many new visualization paradigms require that you present data in novel formats that are either under-supported or don't exist yet.
没有对原始数据的映射，现在只有新的数据块在消耗文件系统中的磁盘空间。
Instead of a map to the original data, there are now new blocks with data, consuming disk space in the file system.
文件系统驱动程序更新适当的元数据，但是没有时间将其缓存中的数据刷新到磁盘的新块中。
The filesystem driver updated the appropriate metadata, but didn't have time to flush the data from its caches to the new blocks on disk.
文件系统驱动程序更新适当的元数据，但是没有时间将其缓存中的数据刷新到磁盘的新块中。
The filesystem driver updated the appropriate metadata, but didn't have time to flush the data from its caches to the new blocks on disk.
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