连接数据库 bde ado（外文文献翻译）.doc

As shown in the previous chapter of this course, a database is a collection of one or more tables that store data in a structured format. These tables, contain data that is represented by rows and fields. When a database consists of two or more tables, these tables generally contain separate yet related data. MS Access, Interbase or SQL Server use a single file (Access, the *.mdb file) that represents the entire database. On the other hand, Paradox and dBase databases are defined with separate tables and files that represent indexes and table relations. All the files needed to describe a Paradox database are usually stored in a single directory. Delphi, of course, has means of working with both approaches.
With Delphi, we can connect to different types of databases: local or client/server (remote server) database. Local databases are stored on your local drive or on a local area network. Remote database servers usually reside on a remote machine. Types of local databases are Paradox, dBase and MS Access. Types of client/server databases are MS SQL Server, Interbase or Oracle.
如这课程所示，一个数据库是一个将数据以一定的结构化方式存储在一个或几个数据表中的一个集合。数据以列和行的结构方式存储在这些表中。 当一个数据库由两个或较多个的表所组成的时候,这些表通常包含有分开的，但是仍然相关联的数据。
MS Access, Interbase or SQL Server 用一个单一文件 (Access, 类似 *.mdb 的文件) 描述整个数据库。 另一方面, 以索引和表的关系描述的文件，用来定义Paradox 和 dBase 数据库。 通常用来描述Paradox 和 dBase 数据库的所有文件被储存在一个单一目录中。因此Delphi 有两种工作方式。