这一点不但对于让Grails框架知道在哪里查找类和配置元数据至关重要，而且能够使应用程序的打包和部署更加轻松。
Not only is it crucial for the Grails framework to know where to find classes and configuration metadata but it will also make it much easier to package and deploy your application.
最常见的原因是需要向仅使用关系数据的遗留SQL应用程序、打包业务应用程序和商业智能 (BI)工具馈送数据。
The most common reason is the need to feed legacy SQL applications, packaged business applications and business intelligence (BI) tools that consume only relational data.
如果我们将应用程序设计为只在便于管理的处理阶段中打包和交换少量XML数据，那么就可以减少这些盲点，使应用程序更易于维护。
If you design applications that package and exchange small, controlled chunks of XML data in manageable processing stages, you reduce these blind spots and make the application easier to maintain.
新的支持数据库的应用程序建议打包方法优于映射方法。
New, database-backed applications suggest a wrapping approach over a mapping approach.
除了功能强大以外，打包应用程序对业务处理的特定方面的关注往往意味着，其处理和数据与其他应用程序隔离。
In addition to being powerful, a packaged application's focus on a specific aspect of business processing tends to mean that its processing and data are isolated from other applications.
下一步，使用为应用程序构建逻辑的php类集打包数据库。
The next step is to wrap the database with a set of PHP classes that build the business logic for the application.
使用JPA的数据访问对象(DAO)与persistence . xml打包在一起，后者为应用程序使用的JPAEntityManager定义持久性上下文。
A data access object (DAO) that USES JPA is packaged with a persistence.xml that defines persistence context for the JPA EntityManager used by the application.
例如，IBM提供IBMCognosVirtualViewManager (VVM)，可用于跨多个文件、数据库和已打包应用程序创建一个安全管理的统一视图。
For example, IBM offers IBM Cognos Virtual view Manager (VVM), which can be used to create a securely managed unified view across files, databases, and packaged applications.
例如，IBM提供IBMCognosVirtualViewManager (VVM)，可用于跨多个文件、数据库和已打包应用程序创建一个安全管理的统一视图。
For example, IBM offers IBM Cognos Virtual view Manager (VVM), which can be used to create a securely managed unified view across files, databases, and packaged applications.
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