求助，无法打开sqlserver连接

[weixin_38067327]

windows xp QT4.7，qt连接sqlserver2005 报错连接代码  Sqlconn="SQLCNECT";    DB_sqlserver = QSqlDatabase::addDatabase("QODBC", Sqlconn);    QString dsn =QString("DRIVER={SQL Server};SERVER=%1;DATABASE=%2;UID=%3;PWD=%4")                 .arg(Ip_Address.trimmed())                 .arg(DB_Name.trimmed())                 .arg(User_Name.trimmed())                 .arg(PWD.trimmed());    DB_sqlserver.setDatabaseName(dsn);    DB_sqlserver.open();