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Rs.CursorLocation

Hi everyone,

When i use CursorLocation adUseClient on opening of a table with large ammount of records, the opening is very very slow.
on the other hand, when i use CursorLocation adUseServer,
i get -1 value on the RecordCount and AbsolutePosition properties.

How can i know the RecordCount and AbsolutePosition properties on CursorLocation adUseServer ?

10x

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mosheshitrit
Asked:
mosheshitrit
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1 Solution
 
mdouganCommented:
Well, you need to understand the difference behind these cursorlocations.  When you specify adUseClient, it creates a "client-side" cursor, meaning that it retrieves all of the data for the recordset and transfers it back to your program to manage.  That is why it takes so long.

A "server-side" cursor simply has to open up and return you one buffer's worth of data.  However, since not all rows have been returned to the cursor, it doesn't yet know how many records there are.  So, the only way you can get an accurate record count is to read to the end of the cursor, and then, perhaps, the recordcount will reflect the number of records, or, you can look a the RS.AbsolutePosition property.

However, in reading to the end of the "server-side" cursor, you've just lost your performance advantage.

If you absolutely need the count at the beginning of returning records, but you absolutely want to use a server-side cursor, then you might consider issuing the same SQL Statement except instead of selecting columns, do a Select Count(*) from ..... get the count first, and then issue the normal select statement....
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hesCommented:
Before you check the recordcount do a Movelast then the recordcount will be populated
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mosheshitritAuthor Commented:
To Hes:

10x but the movelast action does not help
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mosheshitritAuthor Commented:
to mdougan:

Thanks for the explanation.
I can't use the RS.AbsolutePosition property because it returns -1 value

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mdouganCommented:
What type of cursor are you using?  If you are using a foreward only cursor, then you will probably not have valid counts.  You could try opening an adKeyset or one of the dynamic cursor options and that should help.

I'd be surprised about the AbsolutePosition showing -1, are you sure that you were positioned on the first record?  Or on the last record?  Absolute position should tell you the absolute record number of the record that you are positioned on.  So, if you're on the last record then the AbsolutePosition should be equal to the RecordCount.
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mosheshitritAuthor Commented:
To  mdougan:

Thanks for the quick solution.

Use CursorLocation adUseServer with cursorType
adKeyset and you will see both the RecordCount and AbsolutePosition properties.

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