遍历结果MongoDB和GridFS（PHP）
[英]Iterating through results MongoDB & GridFS (PHP)
问题描述
I am using GridFS and I have currently got it to display a single image using findOne, although I would like it to iterate through all the results in the grid and echo them all to screen, here is the code I am using: 
我正在使用GridFS，虽然我希望它可以遍历网格中的所有结果并将它们全部回显到屏幕，但是我现在已经使用findOne来显示单个图像，这是我正在使用的代码：
<?php
try {
// open connection to MongoDB server
$conn = new Mongo;
// access database
$db = $conn->database;
// get GridFS files collection
$grid = $db->getGridFS();
// retrieve file from collection
header('Content-type: image/png');
$file = $grid->findOne(array('_id' => new MongoId('4fb437dbee3c471b1f000001')));
// send headers and file data
echo $file->getBytes();
exit;
// disconnect from server
$conn->close();
} catch (MongoConnectionException $e) {
die('Error connecting to MongoDB server');
} catch (MongoException $e) {
die('Error: ' . $e->getMessage());
}
?>
Thanks 谢谢
3 个解决方案
解决方案1
0 2012-05-17 15:48:09
Use "find" vs "findOne", which will return a result set you can loop through with a foreach, like: 使用“ find”和“ findOne”，这将返回一个结果集，您可以使用foreach对其进行遍历，例如：
$files = $grid->find({});
foreach($files as $file) { echo $file->someData;
解决方案2
0 2012-05-17 15:54:22
通常，如果要在网页上显示图像，则希望具有一堆标签，例如<img src="someUrl" /> ，然后使每个someUrl句柄获取单个图像。
解决方案3
0 2012-06-18 22:21:04
You set the header to image/png so the browser expects only one image. 您将标头设置为image / png，因此浏览器只需要一张图像。
What you could do is change that to a text/html document and embed the images using the data URI scheme (see http://en.wikipedia.org/wiki/Data_URI_scheme ) and then output the images in a series of images tags. 您可以做的是将其更改为text / html文档，并使用数据URI方案嵌入图像（请参阅http://en.wikipedia.org/wiki/Data_URI_scheme ），然后以一系列图像标签输出图像。
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>My images</title>
<head>
<body>
<?php
/* ... db connection/init code ... */
$files = $grid->find({});
foreach($files as $file) {
$encodedData = base64_encode($file->getBytes());
echo "<img src=\"data:image/png;base64,{$encodedData}\">";
echo "<br>";
}
?>
</body>
</html>
Note that you probably want to detect if the mime type of the image and change accordingly and set alt, width and height attributes using the file's metadata. 请注意，您可能想检测图像的mime类型并进行相应的更改，并使用文件的元数据设置alt，width和height属性。
Hope this helps. 希望这可以帮助。
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