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自用的数据库访问封装类，可以操作sqlite mysql sqlserver access
m_pDbProcPic = new CDBProcess("sqlserver");
m_pDbProc->openDB("mysvr", "mydb", "myusername", "mypwd");

m_pDbProcPic = new CDBProcess("mysql");
m_pDbProc->openDB("localhost", "mydb", "root", "password");

m_pDbProcPic = new CDBProcess("access");
m_pDbProc->openDB("", strMDB, "sa", "password");

m_pDbProcPic = new CDBProcess("sqlite");
m_pDbProcPic->openDB("", "mysqlitedb");