从数据库中获取数据并移动并在数组中添加新值

Question

在数据库 table 中，我的值 column.Have 超过 50 行。现在在 php 中，我有一个 10 的固定数组。首先将从数据库中获取 10 行并存储到数组中。当数组满时，第 11 个值将尝试插入到数组中，第 0 个值将移动，第 11 个值将插入到数组中。比如像QUEUE进程。

一开始会显示

[[0,17.9999],[1,13.898],...[9,16.98]]

然后 [0,17.9999] will move and [10,11.88] 将插入并打印如下

[[1,13.898],.......[9,16.98],[10,11.88]]

然后

[2,17.84],......[10,11.88],[11,999]]

等等..

如何在 php 中表示它？

这是我的代码：

<?php
include("md.php");
$sql = "SELECT * from datatable";
$result =oci_parse($conn, $sql);
$r=oci_execute($result);
$arr = array();
$i=0;
while($row = oci_fetch_array($stid,OCI_ASSOC)){

  $arr[] = array_shift(array($i++, (float)$row['VALUE']));
}
echo json_encode($arr);
?>

请帮忙。

Answer 1

如果数组中总是有 10 个键，请尝试

 $arr=array_slice($arr,1,9);
 $arr[]=$row['VALUE'];

改为

$arr[] = array_shift(array($i++, (float)$row['VALUE']));

注意，当您已经拥有包含 10 个项目的数组时，这将是正确的。请参阅下面的示例

$arr = array(1,2,3,4,5,6,7,8,9,10);
echo json_encode($arr)."<br>";    
$con = mysqli_connect('127.0.0.1','app_user2','qwe123','test');
$select="select id from adv where id > 300 and id < 312;";
$res = mysqli_query($con, $select);                      
while ($row=$res->fetch_assoc()) {
    $arr=array_slice($arr,1,9);
    $arr[]=$row['id'];
    echo json_encode($arr)."<br>";
}

在浏览器中它会表示为

[1,2,3,4,5,6,7,8,9,10]
[2,3,4,5,6,7,8,9,10,"301"]
[3,4,5,6,7,8, 9,10,"301","302"]
[4,5,6,7,8,9,10,"301","302","303"]
[5,6,7,8,9,10,"301","302","303","304"]
[6,7,8,9,10,"301","302","303","304","305"]
[7,8,9,10,"301","302","303","304","305","306"]
[8,9,10,"301","302","303","304","305","306","307"]
[9,10,"301","302","303","304","305","306","307","308"]
[10,"301","302","303","304","305","306","307","308","309"]
["301","302","303","304","305","306","307","308","309","310"]
["302","303","304","305","306","307","308","309","310","311"]

Answer 2

如果我理解，在 50 个条目中你只会得到 10 个，而第 11 个正在推开数组的第一个值......这就像得到最后 10 个结果，你不觉得吗？

承认您的 table 有一个自动递增的 'id' 字段：

<?php
include("md.php");
// I've changed your SQL query by adding a reverse sort
// on the 'id' field and put a limit of 10 entries
$sql = "SELECT * from datatable ORDER BY id DESC LIMIT 0,10";
$result =oci_parse($conn, $sql);
$r=oci_execute($result);
$arr = array();
$i=0;
while($row = oci_fetch_array($stid, OCI_ASSOC)){
  $arr[] = (float)$row['VALUE'];
}
echo json_encode($arr);
?>

我还没有测试过这段代码，但它应该可以正常工作；)

编辑：如果 Ilya 的回答是您想要做的，请忽略 D:

从数据库中获取数据并移动并在数组中添加新值

Fetch data from database and shift and add new value in an array

php

arrays

oracle10g