[英]Get next and previous records within the same query
I'm having this PDO query to call data from a MySQL. 我正在使用此PDO查询从MySQL调用数据。
$sql = "SELECT itemName FROM furniture WHERE itemID = :item";
While calling for this particular itemName, is it possible to get the next and previous itemNames by using its itemID within this same query itself without having to write a new query to get the next and previous itemNames? 在调用此特定itemName时,是否可以通过在同一查询本身中使用其itemID来获取下一个和上一个itemName,而无需编写新查询来获取下一个和上一个itemName?
eg if 例如,如果
itemID | itemName
___________________________
553 | Mahogani Black Chair
554 | Teak Round Table
555 | Thulang Relaxing Chair
556 | Teak Relaxing Chair
$sql = "SELECT itemName FROM furniture WHERE itemID = :item";
$stmt = $connect->prepare($sql);
$stmt->execute(array(':item'=>"554"));
$rslt = $stmt->fetchAll(PDO::FETCH_ASSOC);
I'm looking away of getting Teak Round Table
and Mahogani Black Chair
and Thulang Relaxing Chair
我正在寻找
Teak Round Table
和Mahogani Black Chair
和Thulang Relaxing Chair
Please use this code: 请使用以下代码:
(SELECT itemName FROM furniture WHERE itemID < 554 order by itemID desc limit 1)
UNION
(SELECT itemName FROM furniture WHERE itemID >= 554 order by itemID asc limit 2)
For Example code : 例如代码:
MyTable:
================
id Store_name
================
1 English
2 French
3 Tamil
4 Uk
5 US
<?php
$con = mysqli_connect("localhost","root","ramki","ramki");
$sql = "(SELECT store_name FROM store WHERE id < 2 order by id desc limit 1)
UNION
(SELECT store_name FROM store WHERE id >= 2 order by id asc limit 2)";
$query = mysqli_query($con,$sql);
while ($row = mysqli_fetch_assoc($query)) {
echo $row['store_name'];
echo "<br>";
}
?>
$sql = "SELECT itemName FROM furniture WHERE itemID IN (:item-1, :item, :item+1) ORDER BY itemID";
为了迭代结果,您还可以使用PDO fetch()函数来获取每一行。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.