Question

我正在使用PHP，我想创建一个包含Orderid，ID，Employee_Name和Employee_Salary行的表。我想要两个ID列，因为我试图让用户能够向上或向下移动表格行以更改表格行的顺序。显然，根据我的阅读，唯一的方法是使用ID列和Order ID列来操纵表行的顺序。

这是我试图用来上下移动行的代码。例如，我希望用户能够单击向上箭头按钮将第1行：Kelsey，第2行：最大值更改为第1行：最大值，第2行：Kelsey。

PHP代码：

<?php
// Variables -- Fill these out from the results of your page. (i.e. what item id to move up or down)
$id_item = 1;   // ID of item you want to move up/down
$isUp = true;   // Change to false if you want to move item down

// MySQL structure -- Fill these out to execute your queries without needing to update my code
$table_name = "employee";  // Name of table with your items in it
$col_position = "position"; // Name of column with position ID (Remember, this must be UNIQUE to all items)
$col_id = "";           // Name of column containing the items id (most likely the auto_incremented column)

if ($isUp)
{
    $operator = "<";
    $order = "DESC";
}
else
{
    $operator = ">";
    $order = "ASC";
}

// Get row we are moving
$request = mysql_query("
    SELECT '.$col_position.', '.$col_id.' FROM '.$table_name.'
    WHERE '.$col_id.' = '.$id_item.'
    LIMIT 1");

// Save data for row we are moving
if(mysql_num_rows($request) > 0)  {
    $isPos1 = true;
    while($row = mysql_fetch_assoc($request)) {
        $position1 = $row[$col_position];
        $id_item1 = $row[$col_id];
    }
}

// Get row we want to swap with
$request2 =  mysql_query("
    SELECT '.$col_position.', '.$col_id.' FROM '.$table_name.'
    WHERE '.$col_position.' '.$operator.' '.$position1.'
    ORDER BY '.$col_position.' '.$order.' LIMIT 1");

// Save data from row we want to swap with
if(mysql_num_rows($request2) > 0)  {
    $isPos2 = true;
    while($row = mysql_fetch_assoc($request2)) {
        $position2 = $row[$col_position];
        $id_item2 = $row[$col_id];
    }
}

// If both rows exist (indicating not top or bottom row), continue
if ($isPos1 && $isPos2)
{
    $query_update = mysql_query("
        UPDATE '.$table_name.'
        SET '.$col_position.' = '.$position2.'
        WHERE '.$col_id.' = '.$id_item1.'");

    $query_update2 = mysql_query("
        UPDATE '.$table_name.'
        SET '.$col_position.' = '.$position1.'
        WHERE '.$col_id.' = '.$id_item2.'");
}
?>

Answer 1

更新订单的查询应该类似于这样，只是为修改后的项目使用ID为5，新订单ID为2，为了示例：

UPDATE table SET orderID=2 WHERE ID=5;

UPDATE table SET orderID=orderID+1 WHERE ID!=5 AND orderID >= 2;

抱歉，我没有时间专门针对您的桌面设置进行定制，但这肯定会让您走上正确的轨道。

如何使用PHP在MySQL表中插入订单ID列和ID列？

1 个答案: