Virtuoso Backend: Optimize ODBC getCharData

Review Request #106467 - Created Sept. 17, 2012 and submitted - Latest diff uploaded

Information
Vishesh Handa
soprano
Reviewers
nepomuk, soprano
trueg
    Only use 1 SQLFetchData command in most of the cases.
    
    Callgrind stats show that 67.5% of the time in this function is spent in
    the first SQLFetchData, and an additional 27% in the second SQLGetData.
    We can avoid some of this extra cost, by only calling the function
    once.

I can change the size of the default buffer if required.

  
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