Overview of the Database Desktop Clause Samples

Overview of the Database Desktop. The Database Desktop (DBD) is a database maintenance and data definition tool. It enables programmers to query, create, restructure, index, modify, and copy database tables, including Paradox and dBASE files, and SQL tables. You do not have to own Paradox or dBASE to use the DBD with desktop files in these formats. The DBD can copy data and data dictionary information from one format to another. For example, you can copy a Paradox table to an existing database on a remote SQL server. For a complete description of the DBD, see Appendix A, “Using Database Desktop.” Delphi Client/Server enables programmers to develop and deploy database client applications for both desktop and remote servers. One of Delphi’s strengths is the ease with which an application developed for the desktop can be adapted to access data on a remote SQL server. The user interface need not change even if the source of the data changes. To an end user, a Delphi database application looks the same whether it accesses a local database file or a remote SQL database. For simple applications that use TQuery components to access desktop data, the transition to a remote server may be as simple as changing the data source. For other applications, more significant changes may be in order. Some of these changes are the result of differing conventions and concurrency issues between desktop and SQL databases. For example, desktop databases like Paradox and dBASE are record-oriented. They always display records in ascending or descending alphabetic or numeric order. They lock and access a single record at a time. Each time a user changes a record, the changes are immediately written to the database. Desktop database users can see a range of records, and can efficiently navigate forward and backward through that range. In contrast, data in SQL databases is set-oriented, and designed for simultaneous multiuser access. Record ordering must be specified as part of an SQL query. To accommodate multiuser access to data, SQL relies on transactions to govern access. For more information about working with transactions, see Chapter 6, “Building a client/server application.” Database application development methodology‌‌ Developing database applications with Delphi is similar to developing other types of software, but there are important distinctions and challenges that must be addressed. The methodology presented in this section should be used as a guideline that you can adapt to meet your specific business need...
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