1 Introduction With the advancement of technology, the management information system[1] based on computer networks and multi-tasking operating systems in the past is no longer suitable for the needs of the situation. The computing and network structure (C/S) based on the computing and management center has been replaced by the intranet network structure in the current network structure concept, that is, the browser/server (B/S) system integration and network structure model developed based on intranet technology, which is more convenient and superior. In the C/S[2] mode, the software installation must be carried out on each client, which makes it difficult to implement and maintain. If the client is a heterogeneous environment, it must be configured for the client, making the system implementation very complicated and the workload greatly increased. What's worse is that if the system is maintained, each client must be upgraded. System administrators will be busy with maintenance work and exhausted. In this mode, the user interface and business processing are concentrated on the client, which places high demands on the client. When the business processing becomes more and more complicated, the client hardware needs to be upgraded continuously. The scalability of the whole system is poor, and its closed characteristics make it difficult for people to establish a complete information network. At the same time, its development cost is high, its compatibility and scalability are poor, its maintenance is troublesome, its user interface is chaotic and its use is complicated, which greatly hinders the pace of enterprise informatization and must be technically transformed to adapt to the requirements of the new situation. 2 C/S and B/S integration mode B/S (browser/server) mode transforms the C/S fat client/thin server structure into a thin client/fat server structure, and the client software is simplified to just installing a unified browser software; at the same time, since it is based on the TCP/IP protocol and the HTTP protocol, it solves the cross-platform problem well, so that different models and operating systems can be compatible, and it has good scalability, which can effectively protect the enterprise investment [3]. The MIS under the B/S structure is not only easy to maintain, but also has low development and training costs, and good scalability and portability, maximizing resource sharing. However, it has the following disadvantages: (1) Low transmission efficiency. Since the HTTP protocol is based on TCP/IP, the HTTP protocol has a fixed format HTML file form, which has a large file transmission volume and will affect the data transmission efficiency. (2) Each time the client requests data and feedback information, it must communicate with the data server through the network, which increases the network bandwidth requirements; (3) HTML is difficult to encrypt and is easily stolen and intercepted, making it difficult to guarantee the security of the information system. Based on the above analysis, the C/S model structure has strong transaction processing capabilities and is more suitable for rapid information processing within the enterprise, while the B/S structure has better network scalability and compatibility. Both also have some problems to be solved. For distributed organizations, if the advantages of both can be integrated, not only can the openness and universality of the information system be realized, but the closedness and specialization of the internal system can also be maintained, which can better meet the business activities and strategic decisions of the enterprise. Therefore, the hybrid structure scheme is selected for the implementation of the system. 3 System development environment and related technologies 3.1 C/S development platform The selection of the client application development environment should consider the support of the selected server platform, database service and client platform, and have a good development environment, rich software support and convenient software debugging means. For the specific object of discussion, considering the actual situation of the enterprise, Windows 98 with powerful multimedia and network support functions is selected as the client platform, and PowerBuilder 7.0 is used as the client database development tool. The server development environment consists of the selection of network server software platform and database server software environment. In a PC environment, there are various platform servers suitable for client/server architecture, such as NetWare, Windows NT Server, and Unix. Windows NT Server is a high-performance 32-bit multi-user, multi-tasking operating system developed by Microsoft, offering powerful features, ease of use, and scalability, including efficient and reliable databases, host connectivity, communication, system management, and good security and fault tolerance. It has good compatibility with Windows, supporting all its software and most network protocols. Its security and advanced fault tolerance effectively ensure the integrity and validity of information. MS SQL Server is chosen as the database server software. It has good compatibility, is tightly integrated with NT, is easy to learn and use, has a short development cycle, and can well meet the requirements of high performance, security, consistency, and scalability, making it the best choice for enterprises building small to medium-sized databases. The client/server-based MIS accesses and processes the backend database through ODBC (Open Database Connectivity). ODBC is a component of the Windows Open Services architecture and a widely used database interface; it is a SQL-oriented API. Using ODBC as the connector, all applications communicate with different data sources through a specific connector driver and the same function calls, simplifying database access and greatly facilitating cross-platform development and portability. 3.2 B/S Development Platform: The front-end development tool for the B/S system uses ASP (Active Server Pages), the web server uses Microsoft IIS (Internet Information Server) 5.0, and the database, like the C/S system, uses MS SQL Server. Database access technology combines ASP and ADO (Active X Data Objects). ASP and ADO are a complete web database solution offered by Microsoft. Connecting to the database using ASP and ADO is very simple and offers powerful functionality. The combination of ASP and ADO allows users to access the web server's database data using a browser. ASP's database access component accesses OLEDB-compatible data sources through ADO. OLEDB defines a set of standard COM interfaces that demonstrate the functionality of a database management system. By providing convenient access to these COM interfaces, ADO allows the addition of data access functionality to web applications using scripting languages. Since VBScript, the scripting language of ASP, is only a subset of Visual Basic, it does not have the ability to access databases on its own. Server-side components must be created to access data from the data source through COM interfaces. Therefore, before the application can operate on the database, a connection to the data source must be established first. In system development, ADO uses the OLE DB Connection method to connect to the database, i.e., ADO → OLE DB → DB provider → database. The implementation method is as follows: `set conn = server.createobject(“adodb.connection”); conn.open “provider = sqloledb.5.0; data source = dbpath; initial catalog = dbname; user id = user-id; password = my password;”` 3.3 Key Technologies for Data Transfer between C/S and B/S For security reasons, each platform (C/S and B/S) uses a separate database server. This requires a communication computer to connect the C/S database server and the B/S web server, as shown in Figure 1. The client/server (C/S) database server and the communication computer are located on the same local area network (LAN). The communication computer periodically collects synchronization log files and transmits them to the browser/server (B/S) web server. The communication computer connects to the B/S web server via the internet, forwarding the synchronization log files using the HTTP POST method. Since the communication computer is merely a regular user of the B/S web server on the internet, its communication with the C/S database server is interrupted during communication with the web server. Therefore, internet users have no opportunity to attack the C/S database server through the communication computer, thus achieving secure isolation between the B/S and C/S systems and protecting the security of the C/S database server. The internet channel supporting the HTTP protocol uses GGI (General Gateway Interface) to receive the synchronization log files POSTed by the communication computer and forward them to the B/S database server, which then executes the synchronization log file update. [align=center] Figure 1 Data transmission between c/s and b/s[/align] 3.4 Information release platform (1) Provide basic information (such as basic production data, supply channel information, inspection quality indicators, etc.) for inquiries by economic and trade commissions of governments at all levels, resident dispatch stations, transportation subsidiaries, overseas distribution channels of material companies and consumers nationwide. (2) Because it adopts the b/s model, it can realize user login and new user registration functions. Users can also leave messages through the message board to provide feedback and requests. (3) Add OA interface module, various special software interface modules, and Golden Tax System interface module to the information platform. Remote office and data communication can be completed through the Internet, which expands the functions of MIS. 4 Engineering application examples The daily business of a certain enterprise includes: industrial control management, material management, production management, quality management, equipment management, personnel management, financial management, technical management, and comprehensive inquiry of leaders. In order to meet the needs of the superior departments, it is also necessary to provide the competent department with functions such as production report analysis and comprehensive inquiry of indicators. After a lot of analysis and research, and based on the actual situation of the industry, it was determined to establish a production management information system on the network platform. The entire system is divided into two main parts: the MIS system is implemented using a C/S model structure on the company's internal LAN, and the application on the web server provides an information publishing platform using a B/S model structure. An OA interface module, a superior authority software interface module, and a Golden Tax system interface module are added to the platform. Compared with management information systems that only use C/S or B/S models, this hybrid model has the following advantages: (1) It can ensure the security of sensitive enterprise data and strengthen the control over database modification and updates; (2) It simplifies some client-side functions and effectively utilizes enterprise resources; (3) It can achieve a balance between ease of use of general functions and interactivity of complex functions; (4) It has high network efficiency and simple system maintenance. The database server stores all materials and data related to production and operation activities, and the web server is the interface for network users to access the database server and the execution platform for web applications. The network topology of the entire system is shown in Figure 2. 5 Conclusion The integrated management information system based on the hybrid C/S and B/S structure combines and integrates the advantages of both C/S and B/S models. Practice has proven that this structure has advantages such as high transmission efficiency, good security, and low cost, and is also easy to maintain and expand. With the continuous development of MIS, the trend of integrating C/S and B/S models is becoming increasingly apparent. Exploring and designing an enterprise management information system based on a hybrid C/S and B/S model is not only of great significance for improving management level, reducing costs, and improving service quality; at the same time, the system's development has certain reference value for the transformation of existing C/S-based enterprise management information systems. [align=center] Figure 2 System Topology Diagram[/align] References [1] Xia Jiaoxiong et al. Intranet and Management Information Systems [J]. Computer Engineering and Applications, 2000, 36(3): 142-144. [2] Joe Salemi, translated by Qin Qiying. Client/Server Database Guide (Second Edition) [M]. Beijing: Electronic Industry Press, 1995. [3] Xu Baomin, Jiang Li. Design of a New Enterprise MIS System Based on Browser/Server Mode [J]. Computer Engineering and Applications, 1999, 35(6): 63-65