MOVE 中文man页面-japenas move video

NAME

MOVE - 重定位一个游标

SYNOPSIS

MOVE [ direction { FROM | IN } ] cursorname

DESCRIPTION 描述

MOVE 在不检索数据的情况下重新定位一个游标。 MOVE ALL 把游标移动到结尾。 MOVE 的工作类似于 FETCH 命令，但只是重定位游标而不返回行。

请参考 FETCH [fetch(7)] 命令获取语法和参数的详细信息。

OUTPUTS 输出

成功完成时，MOVE 命令返回一个下面形式的命令标签

MOVE count

count 是移动的行数（可能为零）。

EXAMPLES 例子

设置和使用一个游标：

BEGIN WORK;
DECLARE liahona CURSOR FOR SELECT * FROM films;

-- 忽略开头 5 行：
MOVE FORWARD 5 IN liahona;
MOVE 5

-- 抓取游标 liahona 里的第六行：
FETCH 1 FROM liahona;
 code  | title  | did | date_prod  |  kind  |  len
-------+--------+-----+------------+--------+-------
 P_303 | 48 Hrs | 103 | 1982-10-22 | Action | 01:37
(1 row)

-- 关闭游标 liahona 并提交工作：
CLOSE liahona;
COMMIT WORK;

#p#

NAME

MOVE - position a cursor

SYNOPSIS

MOVE [ direction { FROM | IN } ] cursorname

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.

Refer to FETCH [fetch(7)] 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 moved over (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;