blob

How to retrieve in cakephp3.7 the name as string of an image uploaded trough a form with blob column into a mysql database?

由 五迷三道 提交于 2019-11-28 11:46:49
问题 I'm building an e-commerce website with cakephp3.7, and for sellers to post their products they need to upload the image of the article to sell, and that through a form with a Blob column. The images are being uploaded well from the view, but in the database the real name of the image does not appear, instead of that, in that place the name that appears for all the images is 'Blob' for all the articles. The problem is now that when I try to retrieve the article's image (which is only

Delphi load image save as blob in a sql database

由 余生颓废 提交于 2019-11-28 11:42:16
I'm trying to load a Image control from a image blob saved previously in a sql database.I have testd so many ways and i can't make it work. The image blob is saved as: qry.SQL.Text := 'update tbl set pic = :blobVal where id = :idVal'; qry.Parameters.ParamByName('blobVal').LoadFromFile('c:\sample.jpg', ftBlob); qry.Parameters.ParamByName('idVal').Value := 1; any suggestion? bummi There a a lot of treads here about loading images to as database, but I did not find one with update or insert parameters. You might simply assign a graphic object to your parameter. If you want to store different

how to download blob based file from MySQL database in PHP?

由 ぐ巨炮叔叔 提交于 2019-11-28 10:32:05
How can i make a PHP script that will allow me to download a file from a database in MySQL. I have the following table named files where the uploaded file is saved in a BLOB based field. +-------+----------+----------+------------+-------------------+--------+ |fileID | fileName | fileType | fileSize |fileData | userID | +-------+----------+----------+------------+-------------------+--------+ | 1 | file1 | JPEG | 211258 |[BLOB - 206.3 KiB] | 1 | | 2 | file2 | PNG | 211258 |[BLOB - 201.3 KiB] | 1 | +-------+----------+----------+------------+-------------------+--------+ I cannot figure out a

HTML 的tabel导出excel最终版本（JS）

由 你。 提交于 2019-11-28 10:24:26
<script> // 使用outerHTML属性获取整个table元素的HTML代码（包括<table>标签），然后包装成一个完整的HTML文档，设置charset为urf-8以防止中文乱码 var html = "<html><head><meta charset='utf-8' /></head><body>" + document.getElementsByTagName("table")[0].outerHTML + "</body></html>"; // 实例化一个Blob对象，其构造函数的第一个参数是包含文件内容的数组，第二个参数是包含文件类型属性的对象 var blob = new Blob([html], {type: "application/vnd.ms-excel"}); var a = document.getElementsByTagName("a")[0]; // 利用URL.createObjectURL()方法为a元素生成blob URL a.href = URL.createObjectURL(blob); // 设置文件名 a.download = "学生成绩表.xls"; </script> 来源： https://www.cnblogs.com/liuer-mihou/p/11404741.html

Play MP3 file stored as blob

由 ∥☆過路亽．° 提交于 2019-11-28 10:01:42
Put simply, I'd like to play a blob MP3 file in Firefox. I have access to both the blob itself: blob (sliced with mime type audio/mpeg3 ), and its URL: blobURL = window.URL.createObjectURL(blob) . I have tried with: an HTML5 audio player: <audio controls="controls"> <source src="[blobURL]" type="audio/mp3"> </audio> but I get a warning in Firebug telling me that Firefox cannot read files of type audio/mpeg3 . multiple audio player libraries ( SoundManager , JPlayer , etc.), but none seem to allow blob URLs as input. Am I doing it wrong? Or does anyone know a workaround or a library that can

Storing very large integers in MySQL

由 心不动则不痛 提交于 2019-11-28 09:51:45
I need to store a very large number (tens of millions) of 512-bit SHA-2 hashes in a MySQL table. To save space, I'd like to store them in binary form, rather than a string a hex digits. I'm using an ORM ( DBix::Class ) so the specific details of the storage will be abstracted from the code, which can inflate them to any object or structure that I choose. MySQL's BIGINT type is 64 bits. So I could theoretically split the hash up amongst eight BIGINT columns. That seems pretty ridiculous though. My other thought was just using a single BLOB column, but I have heard that they can be slow to

Downloaded document getting corrupted using Blob method in angularJS

由 人走茶凉 提交于 2019-11-28 09:45:05
问题 Downloading a file used to work fine in my application until I upgraded Angular to the latest. Even now, the file is getting downloaded, but the issue is that it is getting corrupted. Upload file is working fine and if we check in the file server, the file will be intact. But upon download, I am getting corrupted file. Html : <td data-title="''"> <a tooltip="Download CV" ng-hide="!talent.resumePath" tooltip-trigger tooltip-animation="false" tooltip-placement="bottom" ng-click="downloadResume

Blob from javascript binary string

由 旧城冷巷雨未停 提交于 2019-11-28 09:27:25
I have a binary string created with FileReader.readAsBinaryString(blob). I want to create a Blob with the binary data represented in this binary string. Is the blob that you used not available for use anymore? Do you have to use readAsBinaryString ? Can you use readAsArrayBuffer instead. With an array buffer it would be much easier to recreate the blob. If not you could build back the blob by cycling through the string and building a byte array then creating a blob from it. $('input').change(function(){ var frb = new FileReader(); frb.onload = function(){ var i, l, d, array; d = this.result; l

Storing base64 encoded data as BLOB or TEXT datatype

由 寵の児 提交于 2019-11-28 09:07:22
We have a MySQL InnoDB table holding ~10 columns of small base64 encoded javascript files and png (<2KB size) images base64 encoded as well. There are few inserts and a lot of reads comparatively, however the output is being cached on a Memcached instance for some minutes to avoid subsequent reads. As it is right now we are using BLOB for those columns, but I am wondering if there is an advantage in switching to TEXT datatype in terms of performance or snapshot backing up. My search digging indicates that BLOB and TEXT for my case are close to identical and since I do not know before-hand what

BLOB vs. VARCHAR for storing arrays in a MySQL table

由 只愿长相守 提交于 2019-11-28 08:23:48
I've got a design decision to make and am looking for some best practice advice. I have a java program which needs to store a large number (few hundred a day) of floating point arrays in a MySQL database. The data is a fixed length Double array of length 300. I can see three reasonable options: Store the data as a BLOB. Serialize the data and store it as a VARCHAR. Write the data to disk as a binary file and store a reference to it instead. I should also mention that this data will be read from and updated frequently. I want to use a BLOB since that is what I have done in the past and it seems
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