blob

I am trying to download a file using AJAX call. I need to use AJAX call because I have to make a post request along with that I need to send some headers from the client. As Server API is not under our control, we don't have much choice other than using AJAX. In order to show file save dialog, I am converting the byte array to blob to Object URL like shown below var oReq = new XMLHttpRequest(); oReq.open("POST","api/operations/zip", true); oReq.responseType = "arraybuffer"; oReq.onload = function(oEvent) { var blob=new Blob([oReq.response], {type: 'application/octet-binary'}); var link

1.前言 本文使用"发现"二字，是表示我作为一个用过mysql oracle hive以及各种nosql数据库的男人，竟然发现有一个如此常识的数据库我竟然不知道。 在配置airflow的时候，我想当然的认为airflow的元数据应该储存在像是mysql类型的数据库中，我从来没有安装过sqlite，但是我直接初始化的airflow的时候，竟然初始化成功了, 并产生了airflow.db这个文件。 SQLite 是一个被大家低估的数据库，但有些人认为它是一个不适合生产环境使用的玩具数据库。事实上，SQLite 是一个非常可靠的数据库，它可以处理 TB 级的数据，但它没有网络层。 它“只是”一个库，它不是传统意义上的服务器。 那我开始了解一下,sqlite是最轻量级的数据库，或者可能连数据库都算不上。但是它又具备数据库的很多功能比如增删改查等等 small , fast , self-contained , high-reliability , full-featured 那我又有疑问sqlite和mysql等数据库的应用环境差异在哪里，其实官网早有解释 SQLite is not directly comparable to client/server SQL database engines such as MySQL, Oracle, PostgreSQL, or SQL

1 //转换为blob有跨域限制 2 var loadImageToBlob = function (url, callback) { 3 4 if (!url || !callback) return false; 5 var xhr = new XMLHttpRequest(); 6 xhr.open('get', url, true); 7 xhr.responseType = 'blob'; 8 xhr.onload = function () { 9 // 注意这里的this.response 是一个blob对象 就是文件对象 10 callback(this.status == 200 ? this.response : false); 11 } 12 xhr.send(); 13 return true; 14 15 } 16 $("#app-wraper img").each(function () { 17 loadImageToBlob($(this).attr("src"), function (blobFile) { 18 if (!blobFile) return false; 19 var reader = new FileReader(); 20 //将文件以Data URL形式读入页面 21 reader.readAsDataURL(blobFile

最近 做项目，做的要是拍照后上传相片，以file格式上传。。所以 拍照 后用canvas生成base64格式再转file。。在PC和安卓都是没有问题，到IOS上面不行。。new file后就是生成一个{}； 查了下file对象 ，支持的浏览器如下： 接口文档 上面 介绍的是file也是 特殊的类型blob： 而bolb对象 主持 主流 的浏览器 。所以转换为blob再转成file来上传，代码 如下： //转成blob function dataURLtoBlob(toDataURL) { var arr = toDataURL.split(","), mime = arr[0].match(/:(.*?);/)[1], bstr = atob(arr[1]), n = bstr.length, u8arr = new Uint8Array(n); while (n--) { u8arr[n] = bstr.charCodeAt(n); } return new Blob([u8arr], { type: mime }); }　　　　//转成file function blobToFile(Blob, fileName) { Blob.lastModifiedDate = new Date(); Blob.name = fileName; return theBlob; } //

I'm struggling to find a way to insert LARGE images (>100MB, mostly TIFF format) in my Oracle database, using BLOB columns. I've searched thoroughly across the web and even in StackOverflow, without being able to find an answer to this problem. First of all, the problem...then a short section on the relevant code (java classes/configuration), finally a third section where i show the junit test i've written to test image persistence (i receive the error during my junit test execution) Edit: i've added a section, at the end of the question, where i describe some tests and analysis using JConsole

1、通过创建a标签，实现下载功能 function downLoad(content,fileName){ var aEle = document.createElement("a");// 创建a标签 // blob = new Blob([content]); aEle.download = fileName;// 设置下载文件的文件名 //aEle.href = URL.createObjectUrl(blob); aEle.href = content;// content为后台返回的下载地址 aEle.click();// 设置点击事件 } let URL ='XXXX' //下载地址 downLoad(URL ,'test.xlxs') 如果content 非下载地址，而是下载的内容。实现代码微调下即可。 function downLoad(content,fileName){ var aEle = document.createElement("a");// 创建a标签 blob = new Blob([content]); aEle.download = fileName;// 设置下载文件的文件名 aEle.href = URL.createObjectUrl(blob); aEle.click();// 设置点击事件 } downLoad('下载内容123123

I have an H2 database ( http://www.h2database.com ) and I'd like to insert a file into a BLOB field via a plain simple sql script (to populate a test database for instance). I know how to do that via the code but I cannot find how to do the sql script itself. I tried to pass the path , i.e. INSERT INTO mytable (id,name,file) VALUES(1,'file.xml',/my/local/path/file.xml); but this fails. Within the code (java for instance), it's easy to create a File object and pass that in, but directly from a sql script, I'm stuck... Any idea ? David For testing, you can insert literal hex bytes or use the

I have a table with image data stored in a blob field in a MySQL database. Is there a way to export those images to files on the filesystem by using only SQL? The images should be named {imageId}.jpg I know that it is easy to do this with Java or whatever but is it possible with just a SQL script? I don't like the idea ... drop procedure if exists dump_image; delimiter // create procedure dump_image() begin declare this_id int; declare cur1 cursor for select imageId from image; open cur1; read_loop: loop fetch cur1 into this_id; set @query = concat('select blob_field from image where imageId='

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 bigger than 1mb , I only recieve this 16:52:27,327 WARN [JDBCExceptionReporter] SQL Error: 0, SQLState:

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? 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 | cat >> .gitignore Obviously you'll have to run this code frequently if you're generating a lot of large files