MySQL 删除数据失败问题

ADOConn m_AdoConn;
m_AdoConn.OnInitADOConn();
_bstr_t sql;
sql ="select * from st order by name desc;";
_RecordsetPtr m_pRecordset;
m_pRecordset=m_AdoConn.GetRecordSet(sql);
int pos=m_list.GetSelectionMark();
//CString m_id;
try
{
m_pRecordset->Move((long)pos,vtMissing);
m_pRecordset->Delete(adAffectCurrent);
m_pRecordset->Update();
m_AdoConn.ExitConnect();
}
catch(...)
{
MessageBox("操作失败");
return;
}
MessageBox("删除成功");
m_list.DeleteAllItems();
ShowTable();