使用数据访问对象时发生下列例外项。
The following exceptions have occurred using Data Access Objects.
使用数据访问对象来抽象和封装对数据源的所有访问。
Use a Data Access Object (DAO) to abstract and encapsulate all access to the data source.
在使用数据访问对象(DAO)或基于JDBC的框架和数据库存储过程时，您可以使用它。
You can still apply it when using data-access object (DAO) or JDBC-based frameworks and database stored procedures.
在整个应用程序中使用数据访问对象(DAO)使我们可以将底层数据访问逻辑与业务逻辑分离开来。
Applying the data access Object (DAO) pattern throughout the applications enabled us to separate low-level data access logic from business logic.
当需要访问单个类型的所有对象的某些全局数据时，请考虑使用此关键字。
Think of it anytime you require access to some global data for all objects of a single type.
在本文中，您将了解使用模拟数据访问对象(SDAO)进行分层测试。
In this article, you'll learn about layered testing with simulated data access objects (SDAOs).
因为用户不使用基于树的对象模型来访问这部分文档，所以构造完整的树会因为数据重复而浪费内存。
Since the user is not using a tree-based object model to access this part of the document, constructing the entire tree would lead to a waste of memory due to replication of data.
本文的代码示例(在下载中可以获得完整的代码包)演示如何使用这些接口帮助执行审计和减少数据访问对象(DAO)中的代码重复。
This article's code examples (see Download to obtain the full package) show how to use these interfaces to facilitate auditing and reduce code duplication in data access objects (DAOs).
一旦您创建了Database对象，您就可以使用它来访问数据，如我们在下一章可以看到的一样。
Once you have created a Database object, you can use it to access data, as we'll see in the next section.
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.
绑定过程需要使用XMLBeansAPI，以面向对象的方式访问真正的XML实例文档中的数据。
The binding process involves using the XMLBeans API to access the data in the actual XML instance document in an object-mannered way.
SDO客户机一般使用DataObject写访问器方法更新数据对象。
To update data objects, SDO clients typically use DataObject write accessor methods. For example, here we can see how the client modifies the data graph obtained for the employee Terence shorter.
例如，使用无效的Xpath表达式访问数据对象将引发SDOInvalidPathException。
For example, accessing a data object by an XPath expression which is invalid will throw an SDOInvalidPathException.
具有直接JDBC访问功能的应用程序使用SQL定义查询，并且依靠自定义代码将结果集数据映射回到实际业务对象。
Applications with direct JDBC access use SQL to define the queries and rely on custom code to map the result set data back to the actual business objects.
如果应用程序使用DAO(数据访问对象)来产生动态sql和存储过程，那么传递给DAO的值对象就可以使用注释声明为一种云资源。
If the application USES a DAO (data access object) with dynamic SQLs and stored procedures, the value object that is passed to DAO can be declared as a cloud resource using annotations.
通过使用数据源对象，您可以访问一个连接数据源的连接池。
By using data source objects, you have access to a pool of connections to a data source.
模型的主实例保持长期状态，并提供应用程序逻辑；而视图使用的副本实际上是一个可任意使用的数据访问对象。
The primary instance of the model is keeping long-term state and providing application logic; the copy used by the view is essentially a disposable data-access object.
与数据库资源一样，通过使用可以合用的连接对象来访问消息队列。
As in the case of a database resource, message queues are accessed using connection objects that can be pooled.
创建好所有必需的数据库对象和包之后，使用组成员关系和组特权来控制对所创建的数据库对象和包的访问。
Once all required database objects and packages are created, use group membership and group privileges to control access to the created database objects and packages.
查询优化器使用数据库中的SYSSTAT目录视图来检索数据库对象的统计信息，并确定访问数据库的最佳方法。
The query optimizer USES the SYSSTAT catalog views in the database to retrieve the statistical information of the database objects and determine the best way to access the data.
可以使用业务对象（服务数据对象 (SDO)的扩展）为数据访问提供抽象层。
You can use Business Objects, extensions of Service Data Objects (SDO), to provide an abstraction layer for data access.
最后，讨论了在多用户环境中如何使用模式有效地控制对数据库对象的访问。
Finally, we covered how schemas can be used as an effective mechanism for controlling access to database objects in multi-user environments.
本系列前两篇文章详细介绍了如何使用内联方法和数据访问对象(DAO)来访问数据库。
The first two articles of this series described in detail how to use inline methods and how to use data access object interfaces (DAOs) to access the database.
基本上，当一个SDO客户机需要检索数据时，它使用DMS来请求数据图，DMS负责管理对数据源的访问，并根据接收到的信息来创建一个图，通常这个图是一个分层的树结构，其中包含了几个数据对象。
Basically, when an SDO client needs to retrieve data, it USES the DMS to require a data graph. The DMS manages the data source access and creates a graph with the information received.
要访问存储于Domino数据库中的信息，最简便、最迅速的方法就是使用DominoCOM对象。
The easiest and most fast-forward method of accessing information stored in Domino databases is through Domino COM objects.
使用模式控制对数据库对象的访问。
Rails使用activerecord库处理数据库访问及数据库表与Ruby对象模型之间的对象关系映射。
Rails USES the ActiveRecord library to handle database access and object-relational mapping between database tables and Ruby object models.
第一个类使用容器管理持久性(Container - Managed Persistence,CMP)来提供对简单数据库表phonebookentrybean的基于对象的访问。
The first one, which USES Container-Managed Persistence (CMP) to provide object-based access to a simple database table, is called PhoneBookEntryBean.
通过使用Informix4GL丰富的语言支持，可以轻松地实现用户界面和业务逻辑，还可以在其中嵌入用于访问数据库对象的SQL语句。
Using Informix 4GL's rich language support, it is easy to implement the user interface and the business logic that might involve embedding the SQL statements to access the database objects.
应用程序可以使用普通的SDOAPI遍历图形，它们可以使用由内容模型定义的对象模型访问数据，或者使用XPath从DataGraph中提取数据。
Applications can traverse the graph using the generic SDO API, they can access data using the object model defined by the content model, or they can use XPath to extract data from a DataGraph.
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