db_modify

	acnet_status.i2.v = db_modify(handle.g.v, request_buffer.i1a.r
				      rows_affected.u4.r)

	This routine modifies data in relational databases using SQL.
	Help with datatypes and creating tables is in intro_database.
	Multiple SQL commands are allowed, no data return is expected.
	If data is returned, 'db_select' should be used instead whether
	or not the caller is interested in the returned data.

	handle		database connection handle returned from
			a previous call to 'db_open'
	request_buffer	SQL statment text, NULL terminated string
	rows_affected	number of rows affected my modify statement

 notes:
 -----
	01. When a requested update finishes with a success return_code, this
	    indicates the SQL sent was executed without an error, not that the
	    SQL sent was the correct SQL to produce the desired results.
	    (ie. an update to a non-existent row is NOT a SQL error)
	02. An update may have been successful even if an error was reported.
	    (ie. A timeout might occur after a request has begun being processed
	     by the database and therefore cannot be canceled.)
	03. Because of 01 and 02, the user should re-read the appropriate data
	    after an update to assure the status of the data.
	04. No locks are maintained in between calls, if a user needs
	    to make sure that data has not changed since the last TIME a table
	    was used, the user should re-read the data during an update
	    transaction.
	05. Sybase allows an unlimited number of commands in one request, this
	    is most useful for inserts.
	06. Under all circumstances, combining multiple reads/updates in the
	    same request improves efficiency: e.g:
	    ...select name from device where di in (1,2,3,4)... instead of
	    four separate requests.
	    ...insert tbl values (1,2) insert tbl values (2,3) insert tbl
	    values (3,4)... instead of three separate requests.

	This function returns ACNET status values as follows:

	SQL_OK			success
	SQL_MOREROWS		success, but available results were ignored
	SQL_xxx			database access failure

	This function requires the following include files:

	clib_h, acnet_errors_h

	Related functions:

	db_select, db_open, db_close, db_error, db_nextrow

	C/C++ usage:

	usage example