COMPUTER SYSTEM, DATABASE ACCESS METHOD, APPLICATION SERVER, AND PROGRAM

摘要

In a computer system, an SQL as a content of data processing request by a database independent protocol (protocol connected to a DBMS) that is issued by an application 3110 is converted from an SQL for an old DB before a migration to an SQL for a new DBMS 3200, then converted into a protocol that depends on a new DBMS 3210, and then provided to the new DBMS 3210. This operation is realized by an extension DB connection middleware 3120 that is obtained by extending a DB connection middleware that does not depend on the DBMS or an application.