Statement Analysis Of SQL Language And The Research Of Database Security

As one of the core software of the information processing, the database system is not only the core of the computer information system, but also a key of the computer technology and its application development. It is the most important core system besides the operating system, storing and access control of the data information as its duty. On the one hand, the database system should provide the safe access services, namely provide reliable data information services to an authorized user; On the other hand, in order to guarantee the usability, confidentiality, integrality and consistency of the data information, an unauthorized user's access to the data information must be denied. To effectively enhance the database's safety factor and protect the valuable data, designing an encrypted database system is of practical significance.On the base of the discussion of lexical analysis, syntax analysis, application resolution of SQL statements, role access control, database encryption technologies and the data structure, an interpreter is designed, which can analyze the encrypted and decrypted lexical rules and syntactical rules. At last, an implementation project of database encryption system is put forward and its main modules are given.