With the rapid development of the Internet and Intranet, the way manufacturing companies approach product development is undergoing significant transformation. Enterprises are now building environments that allow for design and manufacturing across different locations, which plays a crucial role in computer-integrated manufacturing systems (CIMS). Information related to parts and product design within computer-aided design (CAD) processes must be shared among various companies and internal departments. For instance, different departments such as management, marketing, and procurement often need access to product design data and related documents. To facilitate this information sharing, product design information is typically published via a web server, allowing users to browse it through a browser. This method ensures accessibility and efficiency.
ASP (Active Server Pages) has emerged as a powerful tool for dynamic web page development. It offers high execution efficiency and allows easy access to databases, enabling retrieval of the latest data. ASP scripts run on the server side, eliminating the need for specific browsers and broadening its application scope.
ASP functions as a dynamic web page that runs on a web server. While it follows the CGI standard for data access, it simplifies the programming process. ASP provides a server-side scripting environment that generates and executes dynamic, interactive, and efficient web applications. The server automatically interprets ASP code into standard HTML, which can then be viewed by any browser. ASP files have the .asp extension and contain HTML markup, VBScript or JavaScript code, and ASP syntax.
In object-oriented programming, an object represents a complete entity with operations and data. Objects are created using methods like Server.CreateObject, allowing access to their properties and methods. ASP includes six built-in objects: Request, Response, Server, Session, Application, and ObjectContext. These objects help retrieve user input, send information back to the user, control the server environment, store session-specific data, manage application-wide settings, and handle page-level tasks.
To access a database, ASP utilizes ADO (ActiveX Data Object), a Microsoft technology that connects to databases via ODBC drivers. The process involves establishing a connection, opening the database, executing queries, and retrieving results. For example, a connection is created using Server.CreateObject("ADODB.Connection"), followed by the Open method to connect to the database. Queries are executed using the Execute method, and results are displayed using the Recordset object.
The database query system for the cam mechanism consists of two files: cad.htm and search.asp. The cad.htm file defines the table names to be queried. When a user selects a table and clicks "Query," the selected value is passed to search.asp, which processes the request and returns the results to the browser. The query interface and basic dimensions of the cam mechanism are illustrated in the provided figures.
The search.asp script contains a subroutine called rstotable, which generates an HTML table from the query results. The main script checks the selected table name and executes the corresponding SQL query. Depending on the selection, it displays the relevant data using the rstotable function.
In conclusion, the use of ASP for remote database access on the Internet or Intranet proves to be both efficient and practical. It serves as a vital tool for modern manufacturing companies aiming to achieve seamless information sharing.
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