Question

在数据库表中我有Value列。有超过50行。现在在php中，我有一个10的固定数组。最初将从数据库中提取10行并存储到数组中。当数组将满时，第11个值将尝试插入数组，第0个值将移动，第11个值将插入数组。例如像QUEUE过程。

首先会显示

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

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

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

然后

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

依旧......

我如何在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

如果阵列中总是有10个键，请尝试

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

而不是

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

注意，当你已经有10个项目的数组时，它是正确的。见下面的例子

$arr = array(1,2,3,4,5,6,7,8,9,10);
echo json_encode($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个参赛作品中你只会得到10个，而第11个正在推开阵列的第一个值...这就像得到最后10个结果一样，你不觉得吗？

承认您的表格有一个自动递增的“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);
?>

我没有测试过这个片段，但它应该可以正常工作;）

编辑：如果Ilya的回答是你想做的话，请忽略D：

从数据库中获取数据并移位并在数组中添加新值

2 个答案: