Build the data provider and data layer.
构建数据提供程序和数据层。
Points of variability must also exist in the data layer.
数据层中也一定存在变化点。
For the basic application, the data layer is very simple.
对于基本的应用程序，数据层非常简单。
Your Web pages will interact directly with the data layer, without the use of EJBs.
您的Web页面将与数据层直接交流，而不使用EJBs。
Writing data requires opening an output data source and creating a data layer within it.
写数据则需要打开一个输出数据源并在其内创建一个数据层。
To configure the data layer and the tools that access the database for your application.
为了配置数据层以及应用程序用于访问数据库的工具。
Thus, if you create a new form and want to add a data layer to it, you may consider XForms.
因此，如果要创建新的表单，并希望在其中添加数据层，那么可以考虑使用XForms。
To improve security, we recommend that you install the index data service in the data layer.
要提高安全性，我们建议您在数据层安装索引数据服务。
The data layer contains database systems (such as DB2 or Oracle) for holding data of any kind.
数据层包括数据库系统(如db2或者Oracle)，以便保留各种类型的数据。
The data layer is a repository of the XML files that represent the Web service response objects.
数据层是XML文件的储存库，这些文件用来表示Web服务响应对象。
Services can be formed at all layers of the architecture: the infrastructure layer, UI layer, and data layer.
服务可以存在于体系结构的所有层次：基础结构层、ui层和数据层。
With the fake data layer, you can proceed with your UI development and lowers your dependence on other teams.
使用假数据层，可以进行用户界面开发并降低对其他团队的依赖。
This function will create a new buffer feature data layer around the input point features at user specified distance.
此函数将以输入点为基础，按照用户指定的距离创建一个新缓冲区轮廓数据层。
The purpose of XForms model is similar to that of XML data model: to separate the data layer from the presentation layer.
XForms模型的用途与XML数据模型相似：对数据层和表示层进行分离。
Changes to the data layer update the presentation layer, just as changes to the presentation layer will update the data layer.
对数据层的修改会更新表示层，对表示层的修改也会更新数据层。
Not only do you have to contend with Struts, you also have to wrestle with the data layer and its implicit coupling to a database!
不仅需要对付Struts，还必须处理数据层以及数据层与数据库暗含的耦合！
The trend toward increasing simplification is driving enterprises to extend SOA into the data layer by providing information services.
越来越简化的趋势正在推动企业通过提供信息服务来将SOA扩展到数据层。
It has to, in effect, introduce a layer of abstraction, allowing for changes in a data layer with no or minimal impact to service implementations.
实际上，它需要引入一个抽象层，以允许数据层的更改而不影响服务实现或将这种影响降到最低。
With ITCAM, integration begins at the data layer, where a common data model enables a consistent view of information across all components and agents.
使用 ITCAM，集成从数据层开始。在数据层中，一个通用数据模型支持在所有组件和代理上实现一个统一的信息视图。
The first JSP, Welcome.jsp, occupies both the presentation layer and the data layer by using the JSTL SQL library to issue an SQL query from the page.
第一个JSP，即Welcome.jsp，使用JSTLSQL库从该页面发出一个 SQL查询，因而同时占据了表示层和数据层。
Therefore we need to provide variability in the data layer so we can store the nationality of the customer for one bank but not require it for the other.
因此，我们需要在数据层中提供可变性，以便能够为一家银行存储客户国籍，但另一家银行却不需要如此。
The canonical data model establishes this common format on the data layer while the canonical message model defines this uniform format on the services layer.
规范化数据模型在数据层建立这种统一的格式，而规范化消息模型在服务层定义这种统一的格式。
We use a simple XFDL form, a leave application, as an example to demonstrate the use of the XML data model in separating the form's data layer from the presentation layer.
我们以一个简单的XFDL表单(一个休假申请)为例，演示如何使用XML数据模型分离表单的数据层和表示层。
Creating a fake data layer is a useful UI development practice because the persistence layer to be used by the final application is often unavailable to front-end developers.
创建假的数据层是一种有用的用户界面开发实践，因为最终应用程序要使用的持续存储层对于前端开发人员来说，通常是看不到的。
When I develop software, I try to flesh out the data layer of an application before doing anything else: it is unusual for a useful application not to depend on some sort of data.
当我开发软件时，首先要做的就是充实应用程序的数据层：如果一个有用的应用程序不依靠数据，未免太不正常。
Instead of waiting around for the backend team to do its stuff, you can easily develop a fake data layer that mimics the API and functionality that will eventually be sent to you.
所以没有必要等待后台团队把工作完成，可以方便地开发一个假的数据层来模拟最终要发送过来的API和功能。
Because of the fake data layer, you also can define your API connections to other parts of the project and ensure you have less problems when it's time to integrate all the pieces.
有了假数据层，还可以定义到项目其他部分的API连接，并确保在集成所有部分的时候问题较少。
In a stateless design, you must ensure that objects are fully populated by the data layer and that any lazy associations that are needed to show its details are properly initialized.
在无状态的设计中，必须确保完全由数据层填充对象，并且正确地初始化任何与显示其详细内容有关的延迟加载。
We take the data infrastructure layer, and take data stores like Hadoop, and the existing enterprise systems that give that data valuable context and integrate those at the data layer.
我们使用数据基础设施层，使用Hadoop作数据存储，使用现有企业系统赋予数据有价值的上下文，并在数据层整合它们。
For example, in the modification demonstrated in Figure 2, the new efferent coupling of the data layer is now greater than 0 because this layer is now communicating directly to the business layer.
举例而言，在图2所示的修改中，data层的新传出耦合现在大于0，因为该层目前要直接与business层通信。
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