1, layered and meshed:
The representative product is the hierarchical model database management system IMS developed by IBM in 1969.
2. Relational database:
At present, most databases are relational databases. In 1970, IBM researcher E.F.Codd proposed a relational model. Its representative products are sysem R and Inges.
3. The third generation database will be characterized by richer data models and more powerful data management functions, thus providing new applications that traditional database systems cannot support. It must be object-oriented, open and can be used on multiple platforms.
Second, the development trend of database technology:
1, the influence of object-oriented methods and technologies on database development;
Database researchers draw lessons from and absorb ten-day-oriented methods and technologies, and put forward an object-oriented data model.
2, the organic combination of database technology and multidisciplinary technology:
3. Database technology in specialized application fields.