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dbplus_curr() will read the data
for the current tuple for the given
relation 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_prev(), dbplus_next(), and
dbplus_last().