db_nextrow

	acnet_status.i2.v = db_nextrow(handle.g.v, bytes_per_row.u4.v,
				       reply_buffer.g.v, bytes_returned.u4.r)

	This routine reads data one row at a TIME from relational
	databases.  It requires an initializing call to 'db_select'.
	Help with datatypes and creating tables is in intro_database.

	handle		database connection handle returned from
			a previous call to 'db_open'
	bytes_per_row	EXACT size of each and every returned row
			(sum of the lengths of all columns requested)
			If 0, bytes_per_row from initializing
			'db_select' call is used.
	reply_buffer	user's buffer into which the returned row
			will be moved
	bytes_returned	number of bytes returned to user, 0 if
			no more rows

 Note on text/image columns:
	See the description for the db_select function.

	This function returns ACNET status values as follows:

	SQL_OK			success
	SQL_SMALLROW		success, but row is smaller than bytes_per_row
	SQL_xxx			database access failure

	This function requires the following include files:

	clib_h, acnet_errors_h

	Related functions:

	db_select, db_modify, db_open, db_close, db_error, db_free_image

	C/C++ usage:

	usage example