Delphi is a visual software development tool developed by the famous Borland. There is such a sentence, the most classic, I have described Delphi - "The real programmer uses C, smart programmers with Delphi." Many people call Delphi as the fourth-generation programming language, which has simple, high efficiency, powerful features. Compared with Visual C , Delphi is simpler and easier to learn, but in function is not bad; Delphi is more powerful and more practical than Visual Basic. It can be said that Delphi has the characteristics of VC and VB, so it has always been a programming tool for the majority of programmers. Below, we will introduce you to Delphi's characteristics, common components, and methods and steps to develop database programs using Delphi. Since developing, from Delphi 1. Delphi 2 to the current Delphi 7, Delphi 8 (Borland Delphi .NET), Delphi continues to expand and improve its own function, characteristics, and advantages. Delphi provides a variety of development tools, including integrated environments, image editors, and applications for various development databases, such as Database Desktop, and more. Moreover, users are also allowed to mount other application development tools, such as Borland's resource editor (Resour Workshop). Among the many advantages of Delphi, it is particularly prominent in the database: suitable for multiple database structures, from client / server mode to multi-layer data structure mode; high-efficiency database management system and new generation more advanced Database engine; the latest data analysis means and provides a large number of enterprise components. First, let's briefly understand how Delphi has access to the database. Delphi's operation of the database is mainly based primarily using BDE (database engine, Borland Database Engine). Of course, through other ways directly access the database, it can be implemented in Delphi. However, for the local database, the BDE access data is high. If you can skilled your local database, you can easily get started. Especially for beginners, the opportunity to write network databases is not as much as a single-machine local database. So, we focus on the local database. BDE is an intermediate medium responsible for users and database exchanges. In fact, the application is connected by data access components and BDE, and then accesss the database by BDE to complete the operation of the database, not directly operating BDE. This way users only need to care about the data components in Delphi, do not have to deal with BDE directly. Database components are primarily divided into two categories: "Data Access Components" and "Data Control Components", their relationships with the database can be schematically: through BDE, almost all types of databases can be operated. Next, briefly introduce the database components used in Delphi. 1. Data Access Component Data Access Components can be found on the Data Access component page of the Delphi component panel. Here we should pay attention to: Table, Query and StoredProc three controls, which are called "Dataset components" for connectivity to databases. Learners can treat these controls as "virtual" databases, which can be considered to be the operation of the database. (1) DataSource control is a connection medium for data set components and data control components.
