我正在使用php测试mongodb,我遇到了一个我不知道如何解决的问题,这是我目前正在使用的代码。
<?php
require ($_SERVER['DOCUMENT_ROOT'] . '/grafic/mongodb_php/vendor/autoload.php');
$client = new MongoDB\Client;
$snrdb = $client->snrdb;
$nodos_live = $snrdb->nodos_live;
$filter = [];
$options = ['sort' => ['_id' => 1], 'limit' => 1];
$show = $nodos_live->find($filter, $options);
foreach ($show as $collection) {
$snr_1= $collection["n1_snr_1"];
$snr_2= $collection["n1_snr_2"];
}
echo $snr_1 ." ";
echo $snr_2;
?>
这给了我
28.9 28.3
现在,如果我将id和集合名称更改为2,并将n2_snr_ *更改为如此。
<?php
require ($_SERVER['DOCUMENT_ROOT'] . '/grafic/mongodb_php/vendor/autoload.php');
$client = new MongoDB\Client;
$snrdb = $client->snrdb;
$nodos_live = $snrdb->nodos_live;
$filter = [];
$options = ['sort' => ['_id' => 2], 'limit' => 1];
$show = $nodos_live->find($filter, $options);
foreach ($show as $collection) {
$snr_1= $collection["n2_snr_1"];
$snr_2= $collection["n2_snr_2"];
}
echo $snr_1 ." ";
echo $snr_2;
?>
这给了我这个错误信息:
致命错误:未捕获的MongoDB \ Driver \ Exception \ ConnectionException:C:\ xampp \ htdocs \ grafic \ mongodb_php \ vendor \ mongodb \ mongodb \ src \ Operation \ Find.php中的错误排序规范:287 堆栈跟踪: #0 C:\ xampp \ htdocs \ grafic \ mongodb_php \ vendor \ mongodb \ mongodb \ src \ Operation \ Find.php(287):MongoDB \ Driver \ Server-&gt; executeQuery(&#39; snrdb.nodos_liv ... &#39;,对象(MongoDB \ Driver \ Query),数组) #1 C:\ xampp \ htdocs \ grafic \ mongodb_php \ vendor \ mongodb \ mongodb \ src \ Collection.php(531):MongoDB \ Operation \ Find-&gt; execute(Object(MongoDB \ Driver \ Server)) #2 C:\ xampp \ htdocs \ grafic \ test \ test.php(23):MongoDB \ Collection-&gt; find(Array,Array) #3 {main} 抛出 C:\ xampp \ htdocs \ grafic \ mongodb_php \ vendor \ mongodb \ mongodb \ src \ Operation \ Find.php 287
我无法理解为什么我会得到这个错误的消息,任何可以帮助我的人?
如果像这样做转储
<?php
require ($_SERVER['DOCUMENT_ROOT'] . '/grafic/mongodb_php/vendor/autoload.php');
$client = new MongoDB\Client;
$snrdb = $client->snrdb;
$nodos_live = $snrdb->nodos_live;
$show = $nodos_live->findOne(
['_id' => '1']
);
var_dump($show)
?>
我知道这是一个id为1的文件
object(MongoDB\Model\BSONDocument)#19 (1) {
["storage":"ArrayObject":private]=>
array(5) {
["_id"]=>
string(1) "1"
["n1_snr_1"]=>
float(28.9)
["n1_snr_2"]=>
float(28.3)
["n1_snr_3"]=>
string(1) "0"
["time_stamp"]=>
string(19) "2018-05-31 21:44:22"
}
}
同样的,我做了_id =&gt;的转储。 2它表明它也存在。
object(MongoDB\Model\BSONDocument)#19 (1) {
["storage":"ArrayObject":private]=>
array(5) {
["_id"]=>
string(1) "2"
["n2_snr_1"]=>
float(31.7)
["n2_snr_2"]=>
float(35.7)
["n2_snr_3"]=>
string(1) "0"
["time_stamp"]=>
string(19) "2018-05-31 21:44:22"
}
}
答案 0 :(得分:2)
sort
只能将两个值1
用于升序,-1
用于降序。如果要使用_id=2
查询文档,则必须在查询中指定该文档,而不是在排序条件中指定。