Question

我创建了通过PHP代码从mongoDB获取数据的函数。但它似乎运作不佳。

让我们看看我的代码

function updateperformancescore($timepf)
    {
        $mon = new Mongo('mongodb://127.0.0.1:27017');
        $dbs = $mon->selectDB('bitdindatabase');
        $col = $dbs->selectCollection('bd_performance_score');

        $query2 = array("user_ID"=>"999");
        echo "<br>query__".$query2["user_ID"];

        $data2 = $col->find($query2,true);
        echo "<br>count___".count($data2)."<br>";
        echo "check is_object--".is_object($data2)."<br>";
        //echo "--".$data2["user_ID"]."<br>";
        error_reporting(E_ALL ^ E_NOTICE);
        foreach ($data2 as $obj) 
            {
                echo "aaaa";

                $which = array("user_ID"=>$obj["user_ID"],"time"=>$obj["ps_avgtime"],"slug"=>$obj["lesson_slug"]);

                echo json_encode($which);
            }

仅显示网页

query_ 999 计数 __ 1 检查is_object - 1

但我在mongo中的数据是

{ "_id" : ObjectId("501e768eefbdb8637e2b00c8"), "user_ID" : 999, "lesson_slug" : 999, "ps_avgtime" : 999 }
{ "_id" : ObjectId("501e7698efbdb8637e2b00c9"), "user_ID" : 999, "lesson_slug" : 998, "ps_avgtime" : 888 }
{ "_id" : ObjectId("501e76a1efbdb8637e2b00ca"), "user_ID" : 999, "lesson_slug" : 997, "ps_avgtime" : 777 }
{ "_id" : ObjectId("501e76a9efbdb8637e2b00cb"), "user_ID" : 999, "lesson_slug" : 996, "ps_avgtime" : 77 }
{ "_id" : ObjectId("501e76b6efbdb8637e2b00cc"), "user_ID" : 999, "lesson_slug" : 995, "ps_avgtime" : 555 }
{ "_id" : ObjectId("501e76c0efbdb8637e2b00cd"), "user_ID" : 999, "lesson_slug" : 994, "ps_avgtime" : 444 }
{ "_id" : ObjectId("501e76caefbdb8637e2b00ce"), "user_ID" : 999, "lesson_slug" : 993, "ps_avgtime" : 333 }
{ "_id" : ObjectId("501e76d3efbdb8637e2b00cf"), "user_ID" : 999, "lesson_slug" : 992, "ps_avgtime" : 222 }
{ "_id" : ObjectId("501e76dcefbdb8637e2b00d0"), "user_ID" : 999, "lesson_slug" : 991, "ps_avgtime" : 111 }
{ "_id" : ObjectId("501e76e6efbdb8637e2b00d1"), "user_ID" : 999, "lesson_slug" : 990, "ps_avgtime" : 1 }

为什么不进入foreach？这段代码有什么问题以及我如何正确获取数据。请帮助或指导我:)）

修改

我只是error_log而且显示

致命错误：未捕获的异常'MongoException'，消息'MongoCursor对象未被其构造函数正确初始化'/var/www/web/sendanswer.php:92堆栈跟踪：＃0 / var / www / web /sendanswer.php(92）：MongoCursor-＆gt; rewind（）＃1 /var/www/web/sendanswer.php(343）：sendanswer-＆gt; updateperformancescore（4.4269230365753）#2 {main}下一个异常'MongoException'with消息'MongoCursor对象未被其构造函数正确初始化'/var/www/web/sendanswer.php:92堆栈跟踪：＃0 /var/www/web/sendanswer.php(92）：MongoCursor-＆gt;倒带（）＃1 /var/www/web/sendanswer.php(343）：在第92行的/var/www/web/sendanswer.php中抛出sendanswer-＆gt; updateperformancescore（4.4269230365753）#2 {main}

这意味着什么？

修改

这意味着“可能你的Mongo对象没有连接到数据库服务器。”

Answer 1

我看到的是数据类型中的错误。

在数据库中user_ID是一个整数，在PHP查询中，它是一个字符串。尝试：

$query2 = array("user_ID"=> 999);

而不是：

$query2 = array("user_ID"=>"999");

PHP在数据类型上可能很容易，但我不确定Mongodb及其PHP驱动程序。

find语句中的参数也不正确。移除true，因为它应该是一个字段数组，而不是bool

此代码可正常运行：

<?php

$mon = new Mongo('mongodb://127.0.0.1:27017');
$dbs = $mon->selectDB('my_db');
$col = $dbs->selectCollection('newColl');

$query2 = array("user_ID"=> 999);
echo "<br>query__".$query2["user_ID"];

$data2 = $col->find($query2);

error_reporting(E_ALL ^ E_NOTICE);
foreach ($data2 as $obj)
{

  $which = array("user_ID"=>$obj["user_ID"],
                 "time"=>$obj["ps_avgtime"],
                 "slug"=>$obj["lesson_slug"]);
  echo json_encode($which);
  echo PHP_EOL ;
}
?>

输出：

[......]$ php testmongo.php 
<br>query__999{"user_ID":999,"time":999,"slug":999}
{"user_ID":999,"time":999,"slug":999}
{"user_ID":999,"time":339,"slug":999}
{"user_ID":999,"time":339,"slug":5599}

无法从mongoDB获取数据

1 个答案: