Abstract: Relational database refers to the database that uses relational model to organize data.It needs to use structured query language(SQL) to operate the data.When facing the application,it can only operate the database according to the program rules set by the developer.The process of modifying and adding program rules is cumbersome and requires a certain degree of professionalism,which is not friendly to ordinary users.In order to improve the expansion and universality of the application of rela-tional database,this paper uses the knowledge representation theory to model the knowledge related to database operation,uses the knowledge representation method of framework combined with rules to establish the general paradigm of database operation,and studies and designs the reasoning algorithm based on the operation characteristics of relational database and the syntax and semantics of relational model and structured query sentences.The user oriented database operation related things are abstracted into logical symbols,and the internal relationship between them is abstracted into the rule constraints between logical symbols.The problem is solved according to the rule constraints represented by logical symbols using the solving system.Based on the above theories and algorithms,a relational database operation framework integrating knowledge representation is designed and implemented,user input is converted into database operation statements to realize database system operation.It can be seen from the application example that the proposed operation framework can be embedded into the application system on the basis of friendly compatibility with relational database.The program rules are easy to expand,the application system has low difficulty in use,update and maintenance,and has strong self adaptability.It can provide users with more flexible and intelligent database ope-ration management and control services.

Key words: Knowledge representation, Knowledge reasoning, Relational database