更新数据库MFC C ++ ODBC CRecordset

Question

I'm Developing a MFC application (SDI) to update, add and delete a table in the database called security. The problem is after updating one row in the table, the row is Updated ( i verified) then when I do another action (updating another row or deleting a row) the update is canceled. I really don't know if there is a problem with the CRecordset or the database itself.

//m_pSet is a an instance of a class based on CRecordSet:

m_pSet->Open();
m_pSet->Edit();
m_pSet->m_Security_Id = sec->SecurityId;
m_pSet->m_Security_Name = sec->SecurityName;
m_pSet->m_Security_Type_Id = sec->SecurityTypeStringToInt();
if (!m_pSet->Update())
{
    AfxMessageBox(_T("Record not updated; no field values were set."));
}

Answer 1

In my experiences with Oracle and SQL Server there is a difference in the way commit statements happen. The behavior you are seeing implies that the Update is not implicitly committed.

In Oracle , commits are an explicit statement and need to be conducted after you have carried out some transaction.

In SQL Server , commits are implicit by default and do not need to be carried out after transactions.

That being said, this other other Stack Overflow Question and Answer appears to have two methods of making commits explicit in SQL Server, meaning without the commit, you may lose your transaction.

The first being that you can use BEGIN TRANSACTION to have the database wait for a commit statement. From what you have posted, it would seem this is not the case.

The other way to make commit statements explicit in SQL Server is by changing some settings on the databsae itself. Based on your line of thought I would check the settings referred to in the post noted here and ensure that you did not make commits implicit.