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dbplus_curr() will read the data for the next tuple
for the given relation,
will make it the current tuple and will pass it back as an
associative array in
tuple.
The function will return zero (aka. DBPLUS_ERR_NOERR) on
success or a db++ error code on failure. See
dbplus_errcode() or the introduction to this chapter
for more information on db++ error codes.
See also dbplus_first(),
dbplus_curr(), dbplus_prev(), and
dbplus_last().