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dbplus_curr() will read the data for the first tuple
for the given relation,
make it the current tuple and 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_curr(),
dbplus_prev(), dbplus_next(), and
dbplus_last().