This may not work depending on the driver - the DBI manpage says:
For "SELECT" statements, it is generally not possible to know how
many rows will be returned except by fetching them all. Some drivers will return the number of rows the application has fetched so
far, but others may return -1 until all rows have been fetched. So
use of the "rows" method or $DBI::rows with "SELECT" statements is
not recommended.
I can't find anything in the DBD::mysql documentation that would contradict this.
/J\
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