我展示了如何构建连接，构造SQL命令，检索数据，进行更改，以及撤销更改或将其应用到数据库中。
I've shown how to build the connection, construct an SQL command, retrieve the data, make changes, and either undo changes or apply them back to the database.
清单5显示了名为catalog的数据源的部分定义——指定连接的数据库以及如何建立连接(主机、套接字、用户和密码)的代码片段。
Listing 5 shows part of the definition of the source named catalog - the snippet specifies which database to connect to and how to make a connection (host, socket, user, and password).
第4章向您介绍了，Rails应用程序如何建立起来，以及如何将您的应用程序连接到一个数据库。
Chapter 4 tells you how Rails applications are structured and how to connect your application to a database.
开发过程中，对系统中的关键技术如CAD图形信息获取、数据库动态连接功能的实现以及如何对图表数据进行处理提出了相应的解决方法。
During the process of developing the system, many key technical problems such as how to get data from CAD drawings, dynamic links to database and how to deal with chart data have been well resolved.
以下主题介绍如何创建应用程序到数据库、服务以及对象的连接。
The following topics explain how to create connections to databases, services, and objects from your application.
以下主题介绍如何创建应用程序到数据库、服务以及对象的连接。
The following topics explain how to create connections to databases, services, and objects from your application.
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