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CRecordSet and SQL after CRecordSet open
Posted on 1998-08-26
Is it possible to make another SQL query AFTER the CRecordset open statement.
I know that it is possible to use the
m_strFilter (to add a where statment) and the m_strSort
(for a ORDER BY statement). Then by calling the requery, the CRecordset instance will be updated accordingly.
But if you want to carry out a Select Count(*) followed by a Select <Column>, is this possible to do this with out closing and reopening the Crecordset instance with the appropriate query string and to not use any API functions.
I know that it is possible to use the
m_strFilter (to add a where statment) and the m_strSort
(for a ORDER BY statement). Then by calling the requery, the CRecordset instance will be updated accordingly.
But if you want to carry out a Select Count(*) followed by a Select <Column>, is this possible to do this with out closing and reopening the Crecordset instance with the appropriate query string and to not use any API functions.
[X]
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1 Comment
Simple answer: No. Changing the select statment is a fairly major change to the query, and would require _at least_ a 'requery' call. You can simulate the select count by opening the recordset to the select <column> query, doing a move first, and then moveNext while incrementing a counter until you hit the end of the table. This is actually faster than it sounds on most (< 100,000 records) db's on most systems.
However -- you may want to look into the CDao* (e.g. CDaoRecordset) classes. They usually have all the functionality that the ODBC classes have, plus more. If you are working with an Access database, they are definately the way to go. The CDaoRecordset has a working count function, so you can just select <column>, move to the last record, and get the record count, thus removing the need for your first query.
However -- you may want to look into the CDao* (e.g. CDaoRecordset) classes. They usually have all the functionality that the ODBC classes have, plus more. If you are working with an Access database, they are definately the way to go. The CDaoRecordset has a working count function, so you can just select <column>, move to the last record, and get the record count, thus removing the need for your first query.
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