The Research On The Information Database Of Middle And Downstream Yangtze River Navigation Elements

Yangzi river is the first largest river in China and third in the world, it is a grand logistical channel, crossing the country from west to east and has been called the golden waterway.Long time ago people began to use yangzi river as a waterway, and it played an important role. Because of its large volume and low price, the water transport was widely favored by people in the modern logistics and transport, now people pay more and more attention on the natural advantages of the Yangtze River.The ship used in the Yangtze Rive from the first use of wind and manpower developed to the present mechanical power, while the tonnage and handling methods have aslo undergone changed.Today, technology develops rapidly, people have more demands of the golden waterway, notonly play the Yangtze River transport efficiency, but also to ensure navigation safety and water environment.Now shipping is not just by experience, but the informations obtained by means of modernization.The diversity,real time and reliability of the information which can be used greatly affect the navigation efficiency and safety,so building a information database contain the information shipping required and can easily queried has an important significance for the development of modern shipping.By analyzing the needs of sailor and the main information of shipping vessels, determine the kind of information database, then analysis the logic model and conceptual model of the database and build up framework of the database, at last analysis and processing the existing data, enter to the database to build a prototype database of information. According to the data warehouse idea, associated the tables of database and form a three-dimensional database.Using vc to built up the management platform, and link the the management platform with database by programming, so can manipulate the data of database through the management platform easily.To achieve the function which we got in the functional analysis stages by programming,make sure the platform have the input,delete, modify data and other basic functions,but aslo can query the data according to different requirements from database,prvide the information user required convenient.Constructing a database of Navigation elements information can improve the utilization of existing information, and can promote the attention of information is not yet in the process when we improve the function of database, and ultimately form a perfect and powerful database management system. Meanwhile, the data stored in the database is also an important resource for theory and research.