विशिष्ट आकार बनाना

मैं वास्तव में आपका प्रश्न समझ नहीं पा रहा हूं, लेकिन यहां एक सूची को फिर से क्रमित करने का एक उदाहरण दिया गया है...

DROP TABLE IF EXISTS my_table;

CREATE TABLE my_table
(image CHAR(1) NOT NULL PRIMARY KEY 
,position INT NOT NULL
);

INSERT INTO my_table VALUES
('A',1),
('B',2),
('C',3),
('D',4),
('E',5),
('F',6);

तो, मान लें कि हम छवि को स्थिति 5 में स्थिति 2 पर खींचना चाहते हैं...

SET @old_position = 5;
SET @new_position = 2;

SELECT image
     , position old_order
     , ROUND(CASE WHEN position NOT BETWEEN LEAST(@old_position,@new_position) AND GREATEST(@old_position,@new_position) 
                  THEN position 
                  WHEN position = @old_position THEN @new_position
                  ELSE position+(((@new_position<@old_position)-.5)*2)
                  END 
            ,0) new_order 
  FROM my_table;

+-------+-----------+-----------+
| image | old_order | new_order |
+-------+-----------+-----------+
| A     |         1 |         1 |
| B     |         2 |         3 |
| C     |         3 |         4 |
| D     |         4 |         5 |
| E     |         5 |         2 |
| F     |         6 |         6 |
+-------+-----------+-----------+

यहां एक पूर्ण उदाहरण दिया गया है, HTML को आउटपुट करने के लिए कुछ PHP का उपयोग करना... शायद कोई और इसे सुंदर बना सकता है...

<?php
//simple_sorter.php
//Preamble

/*
A simple row repositioning script.
This is using a simple $_GET to determine which row is repositioned.
So you need to supply a source and a target in the url, e.g.:

https://path/to/simple_sorter.php?old_position=5&new_position=2

There is no error checking, so it can quite easily fall apart, and because   
the SELECT comes befpre the UPDATE, you won't see any changes until the 
next time you load the page.
*/

//Data Creation Statements

/*
DROP TABLE IF EXISTS my_table;

CREATE TABLE my_table
(image CHAR(1) NOT NULL PRIMARY KEY
,position INT NOT NULL
);

INSERT INTO my_table VALUES
('A',1),
('B',2),
('C',3),
('D',4),
('E',5),
('F',6);
*/

require('path/to/pdo/connection/stateme.nts');

//My understanding is that the following is needed 
  in order to replace (every instance within the 
  query of) :old_position and :new_position with 
  their corresponding values

$pdo->setAttribute(PDO::ATTR_EMULATE_PREPARES, TRUE);

//and now to the code...

$query = "
SELECT *
  FROM my_table
 ORDER
    BY position
";
$stmt  = $pdo->prepare($query);
$stmt->execute();
$data  = $stmt->fetchAll();
print_r($data);

$query = "
UPDATE my_table x
  JOIN
     ( SELECT image
            , position old_order
            , ROUND(CASE WHEN position NOT BETWEEN LEAST(:old_position,:new_position) AND GREATEST(:old_position,:new_position)
                         THEN position
                         WHEN position = :old_position THEN :new_position
                         ELSE position+(((:old_position>:new_position)-.5)*2)
                         END
                   ,0) new_order
         FROM my_table
     ) y
    ON y.image = x.image
   SET position = new_order
";

$old_position  = $_GET['old_position'];
$new_position  = $_GET['new_position'];

$stmt  = $pdo->prepare($query);
$stmt->execute(array('old_position' => $old_position,'new_position' => $new_position));

?>

आउटपुट (उदाहरण के लिए, और यह निर्भर करता है कि किन मूल्यों का उपयोग किया गया था, और कितनी बार)...

Array
(
    [0] => Array
        (
            [image] => A
            [position] => 1
        )

    [1] => Array
        (
            [image] => D
            [position] => 2
        )

    [2] => Array
        (
            [image] => E
            [position] => 3
        )

    [3] => Array
        (
            [image] => B
            [position] => 4
        )

    [4] => Array
        (
            [image] => C
            [position] => 5
        )

    [5] => Array
        (
            [image] => F
            [position] => 6
        )

)