VC++2008 SQLServer2008链接自己的数据库不正常

[carmen_zw_007]

hr = m_pConnection->Open("Provider=SQLOLEDB.1;Persist Security Info=TRUE;User ID=sa;Initial Catalog=master;Data Source=YZ001","sa","111111",adModeUnknown);//OK
链接系统数据库就对

hr = m_pConnection->Open("Provider=SQLOLEDB.1;Persist Security Info=TRUE;User ID=sa;Initial Catalog=test;Data Source=YZ001","sa","111111",adModeUnknown);//链接不上
链接自己创建的数据库就连接不上。请问我哪里写的有问题？？