SQL Move – ProtonBase 文档

MOVE

MOVE — position a cursor

Synopsis

MOVE [ direction ] [ FROM | IN ] cursor_name
 
where direction can be one of:
 
	NEXT
	PRIOR
	FIRST
	LAST
	ABSOLUTE count
	RELATIVE count
	count
	ALL
	FORWARD
	FORWARD count
	FORWARD ALL
	BACKWARD
	BACKWARD count
	BACKWARD ALL

Description

MOVE repositions a cursor without retrieving any data. MOVE works exactly like the FETCH command, except it only positions the cursor and does not return rows.

The parameters for the MOVE command are identical to those of the FETCH command; refer to FETCH for details on syntax and usage.

Outputs

On successful completion, a MOVE command returns a command tag of the form

MOVE count

The count is the number of rows that a FETCH command with the same parameters would have returned (possibly zero).

Examples

BEGIN WORK;
DECLARE liahona CURSOR FOR SELECT * FROM films;
-- Skip the first 5 rows:
MOVE FORWARD 5 IN liahona;
MOVE 5
-- Fetch the 6th row from the cursor liahona:
FETCH 1 FROM liahona;
 code | title | did | date_prod | kind | len
-------+--------+-----+------------+--------+-------
 P_303 | 48 Hrs | 103 | 1982-10-22 | Action | 01:37
(1 row)
-- Close the cursor liahona and end the transaction:
CLOSE liahona;
COMMIT WORK;

Compatibility

There is no MOVE statement in the SQL standard.