blob | 易学教程

Download large size files with angular file saver

阅读更多关于 Download large size files with angular file saver

问题 I have implemented angular file saver into my project with purpose to download files and it works fine for small files, but for files larger then 50mb I see next error and downloading stops after 35-50mb. net::ERR_INCOMPLETE_CHUNKED_ENCODING I have tried to investigate this question in internet and have found that there is a limit 500mb on downloading because obviously cannot be stored so much information in RAM. Unfortunately I didn't find any other quite explanation how to resolve this

Oracle Database BLOB to InputStream in Java?

阅读更多关于 Oracle Database BLOB to InputStream in Java?

问题 I made a Java function that takes an InputStream as an input. I have a oracle.sql.BLOB instance to pass to that function. How can I convert it to a InputStream ? Do I need to re-write my function using a BLOB parameter, instead? 回答1: Declare your Java parameter of type oracle.sql.BLOB as per the "Mapping Datatypes" documentation. Then, you call getBinaryStream() on that BLOB object to obtain your InputStream . 回答2: You haven't really said how you're fetching data from the database, but you

项目中下载加权，你是怎么做的，欢迎评论。

阅读更多关于项目中下载加权，你是怎么做的，欢迎评论。

项目中我们遇到过这种需求：　　下载我们可以直接<a download></a> 方式直接下载，那么问题来了，我们直接 href 赋值后台返回的 src 路径，我们的文件可以被下载下来，但是现在我记录了你的静态路径，但是后台又没有及时的清理 vas 存储的文件，那么记录之后我们直接地址栏拼接方式是不是也可直接下载，即使你么有登录情况下。　　这个问题听起来还是蛮简单的，但是处理上我们前后台都要处理，后台需要定时的处理文件，前端要做的是给文件添加登录权限，那么我们想到了 token 登录令牌。那么我们一步步来：　　1、文件的下载方式不能向这样的方式下载了，需要我们请求接口方式下载文件。　　2、nginx 需要配置文件的下载路径的 token 权限，去redis当中取登录状态，假如查到了那么默认你是可以下载的。　　　const getDownFile = (href, _name, type) => { if(!href || !_name) return; !!type ? console.log("当前文件路径："， href):nu let xhr = new XMLHttpRequest(); xhr.open("get", href); xhr.setRequestHeader("accessToken", "登录之后存入token的前端缓存中取")； xhr

Display image from blob using javascript and websockets

阅读更多关于 Display image from blob using javascript and websockets

I'm currently working on a WebSocket application that is displaying images send by a C++ server. I've seen a couple of topics around there but I can't seem to get rid of this error in Firefox: Image corrupt or truncated: data:image/png;base64,[some data] Here's the Javascript code I'm using to display my blob: socket.onmessage = function(msg) { var blob = msg.data; var reader = new FileReader(); reader.onloadend = function() { var string = reader.result; var buffer = Base64.encode(string); var data = "data:image/png;base64,"+buffer; var image = document.getElementById('image'); image.src =

Storing images in Core Data or as file?

阅读更多关于 Storing images in Core Data or as file?

I have set of data which contains images also. I want to cache this data. Should i store them on file system or on core data and why? There are two main options: Store the file on disk, and then store the path to the image in core data Store the binary data of the image in core data I personally prefer the 1st option, since it allows me to choose when I want to load the actual image in memory. It also means that I don't have to remember what format the raw data is in; I can just use the path to alloc / init a new UIImage object. westsider You might want to read this from the Core Data

Chrome: Create file input from blob with Javascript?

阅读更多关于 Chrome: Create file input from blob with Javascript?

问题 Well, the files attribute of an input[type=file] is read-only. Therefore I can not write my blob data into this input element. But if I create a new input file element using Javscript , then possible to insert blob data on creation? I am only interested in solutions working in chrome (extension) - other browsers do not matter. 回答1: new File() constructor is available at chromium / chrome 38+. See File Constructor Sample , File API. var date = new Date(), filename = "file-" + date.getTime() +

What is it exactly a BLOB in a DBMS context

阅读更多关于 What is it exactly a BLOB in a DBMS context

What is it a BLOB? How can I use it? What are the differences between DBMS's BLOBs. I would like to save data using BLOBs into any DBMS and then read that BLOB with a library. sgokhales BLOB : BLOB ( Binary Large Object ) is a large object data type in the database system. BLOB could store a large chunk of data, document types and even media files like audio or video files. BLOB fields allocate space only whenever the content in the field is utilized. BLOB allocates spaces in Giga Bytes. USAGE OF BLOB : You can write a binary large object ( BLOB ) to a database as either binary or character

JPA, Mysql Blob returns data too long

阅读更多关于 JPA, Mysql Blob returns data too long

问题 I've got some byte[] fields in my entities, e.g.: @Entity public class ServicePicture implements Serializable { private static final long serialVersionUID = 2877629751219730559L; // seam-gen attributes (you should probably edit these) @Id @GeneratedValue private Long id; private String description; @Lob @Basic(fetch = FetchType.LAZY) private byte[] picture; On my database schema the field is set to BLOB so this should be fine. Anyway: Everytime when I try to insert a picture or pdf - nothing

gitignore by file size?

阅读更多关于 gitignore by file size?

问题 I'm trying to implement Git to manage creative assets (Photoshop, Illustrator, Maya, etc.), and I'd like to exclude files from Git based on file size rather than extension, location, etc. For example, I don't want to exclude all .avi files, but there are a handful of massive +1GB avi files in random directories that I don't want to commit. Any suggestions? 回答1: I'm new to .gitignore, so there may be better ways to do this, but I've been excluding files by file size using: find . -size +1G |

How to display an BLOB image stored in MySql database?

阅读更多关于 How to display an BLOB image stored in MySql database?

I am trying to display the last 5 images uploaded to my "store" table in MySql. I'm a complete noob to PHP and databases and i've been reading a lot on how to do this but no luck. I can store and display pictures one at a time but i'd like to be able to have a gallery of sorts to show the last 5 uploaded. any advice or help would be greatly appreciated thanks! p.s. I know it frowned upon to store pictures to a database like this but this project is just for practice. index.php <!DOCTYPE html> <html> <head> <title>Project One</title> </head> <body> <form action="index.php" method="POST" enctype